An Emergency Medicine Broadsheet
·Phoenix·
Est. MMXXVI
Blue Fish Med · Today's Topic
SCIWORA
SCIWORA represents spinal cord dysfunction despite no fracture or dislocation on plain radiographs or CT. Missing occult cord injury can convert a transient deficit into permanent paralysis through delayed movement, instability, hypoxia, or hypotension.
Also known asspinal cord injury without radiographic abnormality
A 12-year-old boy arrives holding his neck stiffly, his football jersey damp with sweat and grass clinging to one shoulder. He collided head-first with another player, stood up, and initially said he was fine; ten minutes later, both hands began to tingle and his legs felt “rubbery.” He can move everything, but his grip is weak and the sensation is not returning to normal. The question is whether a normal first scan will be enough to send him home.
— What’s your move? Read on.
Before you read
When is MRI needed despite reassuring radiographs?
What are the first preventable secondary insults?
When to Think of It
Think of SCIWORA when trauma is followed by weakness, paresthesias, sensory change, gait difficulty, bowel/bladder symptoms, or transient neurologic deficits despite normal or near-normal radiographs/CT. It is classically pediatric, but adults—especially those with degenerative cervical disease—can have spinal cord injury with a normal CT.
Sick or Not Sick
Any objective or persistent neurologic deficit = spinal cord injury until proven otherwise. The critical call is whether the patient has neurologic symptoms/signs requiring continued immobilization and urgent MRI rather than routine cervical-spine clearance.
The First Fifteen Minutes
Maintain inline spinal motion restriction for any neurologic complaint or significant mechanism; movement can worsen occult instability.
If hypoxemic or ventilating poorly: oxygen by nasal cannula 2–6 L/min or nonrebreather 10–15 L/min, titrated to adequate oxygenation; hypoxemia worsens secondary cord injury.
If hypotensive: establish IV/IO access and give lactated Ringer’s or normal saline 500–1,000 mL IV bolus, reassessing frequently; spinal cord perfusion depends on avoiding hypotension. Use smaller aliquots in children or patients at risk for overload.
If pain is limiting examination: fentanyl 25–50 mcg IV, repeat 25 mcg every 5 minutes to effect, or 1 mcg/kg IV in a monitored patient; analgesia reduces movement and sympathetic stress without obscuring a properly documented baseline examination. Check a reference for pediatric dosing and institutional maximums.
If respiratory failure or inability to protect the airway: perform controlled airway management with cervical motion restriction; ketamine 1–2 mg/kg IV for induction is commonly useful because it generally preserves blood pressure. Dose selection varies with shock and age—verify with local RSI protocol.
Do not give routine methylprednisolone for acute traumatic spinal cord injury; neurologic benefit is unproven and complications are significant.
Definitive Care & Disposition
Obtain thin-cut CT when indicated by mechanism, age, or examination, but a normal CT does not clear a patient with objective neurologic findings. Obtain urgent MRI of the symptomatic spinal region—often the entire cervical spine—to identify cord edema/contusion, epidural hematoma, ligamentous injury, or disc herniation. Consult spine surgery/neurosurgery early. Admit patients with neurologic symptoms, abnormal MRI, persistent midline tenderness with unreliable examination, or significant cord compression to a monitored setting; ICU care is appropriate for evolving deficits, respiratory compromise, or hemodynamic instability. Maintain normoxia, normocapnia, normothermia, and adequate perfusion; avoid prophylactic surgery or steroids without specialist guidance.
How This One Kills
The dangerous error is clearing the cervical spine solely because CT shows no fracture, then allowing ambulation or neck movement while an occult cord contusion, disc herniation, or ligamentous injury is evolving.
The Differential — What Else Looks Like This
Transient spinal cord concussion — symptoms resolve completely and MRI is normal; confusing it with ongoing injury risks premature clearance.
Peripheral nerve or brachial plexus injury — deficits follow a nerve distribution rather than a cord level; misclassification can delay spinal imaging.
Conversion/functional neurologic symptoms — inconsistent examination without an anatomic pattern; labeling trauma-related symptoms as functional too early can miss cord injury.
Epidural hematoma — progressive pain and neurologic decline, sometimes with initially normal CT; delay can permanently worsen compression.
The Second-Day Story
Older adults may report hand clumsiness, burning dysesthesias, or difficulty walking rather than dramatic paralysis, particularly after a low-energy fall onto a degenerative cervical spine. Children may transiently improve before deterioration, and a normal neurologic examination between episodes does not erase the history. Repeated examinations, strict motion restriction, and MRI for persistent or objective symptoms preserve the diagnosis when the initial signal is faint.
Back to Our Patient
Back to the 12-year-old football player: his persistent hand paresthesias and weak grip make this a suspected spinal cord injury despite an initially normal CT. He remains in spinal motion restriction, receives a focused repeat neurologic examination and analgesia, and is monitored for respiratory or hemodynamic deterioration. MRI demonstrates cervical cord edema without fracture, confirming SCIWORA; spine surgery is consulted, and he is admitted for neurologic monitoring and specialist-directed management rather than cleared for discharge.
Patient Presentation to Attending
How you’d present this patient on the floor — tight, pertinent positives and negatives, no rambling
“This is a 12-year-old previously healthy boy with neck pain and bilateral hand tingling after a head-first football collision approximately 30 minutes ago. He initially walked but then developed persistent paresthesias and subjective leg weakness without loss of consciousness or vomiting. He is alert, hemodynamically stable, has midline cervical tenderness, bilateral decreased grip strength, and persistent hand sensory symptoms, but no respiratory distress or obvious long-bone injury. CT shows no fracture or dislocation. I’m concerned for spinal cord injury without radiographic abnormality, so I’m maintaining motion restriction, repeating examinations, obtaining urgent MRI, and consulting spine surgery for monitored admission.”
Study Directive
Practice a complete motor, sensory, reflex, and rectal examination for suspected cord injury.
Memorize the distinction between CT-based cervical clearance and MRI indications.
Review pediatric cervical trauma and adult degenerative cervical SCIWORA patterns.
Work through three cases: normal CT with persistent deficit, transient symptoms that resolve, and progressive neurologic decline.
State aloud your airway, perfusion, immobilization, MRI, and consultation plan in under 60 seconds.
Farrell CA, Hannon M, Lee LK · Curr Opin Pediatr, 2017 · PMID 28306628 · cited 35×
Persistent or transient neurologic deficits after pediatric trauma despite normal radiographs or CT should prompt continued spinal precautions, MRI evaluation, and specialist consultation for possible SCIWORA.
This contemporary pediatric cohort updates the presentation and clinical course of transient spinal neuropraxia, informing MRI use, observation, and counseling when initial imaging is unrevealing.
More in Today's Issue
4 additional topics
2 of 5
Closed Fist Injuries
A clenched-fist injury can inoculate deep structures with oral flora through a deceptively small wound. Delayed recognition causes septic arthritis,...
Also known asfight bite · clenched-fist injury · human bite
A 28-year-old man sits in triage with a swollen right hand wrapped in a paper towel, the knuckles scraped and streaked with dried blood. He says he struck another man’s mouth during an argument and insists the wound is “just a small cut.” The hand hurts most when he tries to make a fist, and he has not yet washed it. Before the fingers are flexed or the wound is closed, one hidden question remains: what exactly did the fist hit?
Before You Read
Which wound location should trigger concern for a tooth-related inoculation?
What examination finding changes this from a simple laceration to a surgical problem?
Which imaging and consultation decisions cannot wait?
Why It Matters
A clenched-fist injury can inoculate deep structures with oral flora through a deceptively small wound. Delayed recognition causes septic arthritis, extensor tendon infection, osteomyelitis, and loss of hand function.
When to Think of It
Any dorsal hand laceration over the MCP joint after punching a person—especially the teeth—is a fight bite until proven otherwise. Ask what was struck, inspect with the hand both open and making a gentle fist, and assess tendon function, sensation, perfusion, joint penetration, and foreign body.
Sick or Not Sick
The key call is whether the wound communicates with the MCP joint, extensor tendon, tendon sheath, or bone. Deep penetration, delayed presentation, immunocompromise, systemic illness, purulence, pain with passive motion, or impaired function requires hand-surgery involvement and usually admission.
The First Fifteen Minutes
Irrigate contaminated wounds immediately: use copious normal saline under pressure after local anesthesia; dilution and removal of oral debris reduce bacterial burden.
For significant pain: acetaminophen 1,000 mg PO or ketorolac 15 mg IV/IM if renal function, bleeding risk, and pregnancy status permit; analgesia allows a reliable tendon and neurovascular examination.
If an open fight bite or suspected joint/tendon penetration is present: ampicillin-sulbactam 3 g IV now; it covers streptococci, staphylococci, anaerobes, and Eikenella. Verify renal adjustment and allergy alternatives with a reference.
If systemic infection, rapidly progressive swelling, or sepsis is present: obtain blood cultures if this does not delay antibiotics, then give the above antibiotic promptly; early therapy limits deep-space spread.
If tetanus status is incomplete or unknown: tetanus toxoid-containing vaccine 0.5 mL IM. If the wound is dirty and the primary series is incomplete or unknown, add tetanus immune globulin 250 units IM at a separate site; passive antibody bridges the vaccination gap.
Do not primarily close a contaminated fight bite in the ED; closure can seal bacteria into the joint or tendon compartment.
Definitive Care & Disposition
Obtain hand radiographs for fracture, foreign body, or intra-articular air; a tooth fragment may be radiopaque. Explore only after adequate anesthesia and with a hand-surgery plan—do not blindly probe a joint. Admit for operative irrigation and debridement when there is joint penetration, tendon involvement, abscess, fracture with contamination, neurovascular compromise, systemic illness, or delayed presentation with infection. Selected superficial wounds without deep involvement may receive oral amoxicillin-clavulanate 875/125 mg PO twice daily, close follow-up within 24 hours, elevation, dressing, and splinting in a functional position; confirm dosing and renal adjustments locally.
How This One Kills
The classic failure is treating a dorsal MCP wound as a superficial laceration, closing it, and missing penetration into the joint—leading to septic arthritis and irreversible extensor mechanism damage.
The Atypical Presentation
Partially treated or delayed patients may have only mild erythema while developing deep infection. Diabetes, alcohol use, immunosuppression, and poor follow-up further blunt the inflammatory picture. The mechanism and location remain diagnostic clues: examine the wound in the position in which it occurred, then reassess active extension, passive MCP motion, sensation, and perfusion after irrigation and analgesia.
Back to Our Patient
Back to the 28-year-old man: the dorsal MCP wound occurred when his clenched fist struck a mouth, so it is a fight bite until proven otherwise. After analgesia, irrigation, radiographs, tetanus review, and documentation of tendon and neurovascular function, pain with passive MCP motion and intra-articular air raise concern for joint penetration. He receives IV ampicillin-sulbactam, remains splinted and elevated, and is admitted for urgent hand-surgery evaluation and operative washout rather than wound closure or discharge.
Patient Presentation to Attending
“This is a 28-year-old man with a dorsal right hand laceration over the third MCP after punching another person in the mouth several hours ago. The wound is small but contaminated, with increasing swelling and pain on passive MCP motion; he denies numbness, and the hand is warm with intact capillary refill. He has pain-limited extension but no clear tendon discontinuity, and radiographs show no fracture but do show a small focus of intra-articular air. I’m concerned for a fight bite with MCP joint penetration and possible septic arthritis. I’ve irrigated it, given tetanus-directed prophylaxis and IV ampicillin-sulbactam, splinted and elevated the hand, and I’m consulting hand surgery for operative management.”
Study Directive
Draw the anatomic relationship between dorsal skin, extensor tendon, MCP capsule, and metacarpal head.
Practice documenting a hand exam: tendon function, two-point sensation, capillary refill, passive motion, and wound position.
Memorize oral-flora coverage for fight bites and the indications for tetanus immune globulin.
Review three radiographs for fracture, tooth fragment, and intra-articular air.
Verbally defend “close versus leave open” and “discharge versus admit” in two simulated cases.
Key Medications
Ampicillin-sulbactam: 3 g IV every 6 hours for established or high-risk fight-bite infection; adjust for renal dysfunction and verify local protocol.
Amoxicillin-clavulanate: 875/125 mg PO twice daily for selected outpatient prophylaxis/treatment; duration varies with prophylaxis versus infection—check a reference.
Acetaminophen: 1,000 mg PO every 6 hours; maximum generally 4,000 mg/day in healthy adults, lower with liver disease or heavy alcohol use.
Ketorolac: 15 mg IV or 30 mg IM once, then dosing depends on age/renal function; avoid in significant renal disease, GI bleeding risk, anticoagulation, or pregnancy.
Tetanus vaccine: 0.5 mL IM.
Tetanus immune globulin: 250 units IM when indicated for dirty wounds with incomplete/unknown primary series.
High-Yield Pearls
Examine a dorsal wound with the hand flexed: the skin injury may move over and conceal the joint penetration that occurred during the punch.
Pain with passive MCP motion is a deep-space warning, not merely “swelling.”
A normal radiograph does not exclude tendon, joint, or bacterial inoculation.
The Mimics
Simple dorsal hand laceration — no tooth mechanism and no joint-level tenderness; assuming this when a fist struck a mouth delays antibiotics and exploration.
Metacarpal fracture — bony tenderness or angulation dominates; missing a concurrent fight bite leaves infection untreated.
Cellulitis — superficial erythema without pain on joint motion; mislabeling septic arthritis as cellulitis delays washout.
Extensor tendon injury — inability to fully extend a digit or extensor lag; confusing it with pain-limited motion loses tendon function.
Board Question
A patient presents with a laceration over the MCP joint after punching another person. Which management is most appropriate?
APrimary skin closure after superficial irrigation
BOral cephalexin and follow-up in one week
CCopious irrigation, amoxicillin-clavulanate or IV ampicillin-sulbactam based on depth, and hand consultation when deep involvement is suspected
DIncision and drainage of the wound without antibiotics
Reveal answer
Correct: C
Fight bites are polymicrobial and may involve Eikenella, tendon, joint, or bone. Deep penetration requires IV antibiotics and urgent hand-surgery management; primary closure is generally avoided.
Oral Maxillofac Surg Clin North Am, 2021 · cited 17×
Provides practical guidance for recognizing clenched-fist human bites, assessing joint and tendon involvement, and initiating irrigation, antibiotics, and timely surgical consultation.
3 of 5
Felon Incision and Drainage
A felon is an infection of the closed pulp compartments of the fingertip. Pressure can compromise local blood flow and spread infection to bone, tendon, or...
Also known asfelon drainage · digital pulp abscess · finger pulp abscess
A 34-year-old carpenter cradles his left index finger, its fingertip shiny and tense like a polished red bead. He reports three days of throbbing pain that now wakes him whenever the finger touches the bedsheet. There is no obvious drainage, but the pressure in the fingertip is visible before the incision is ever considered. The task is to release the right compartment without injuring the structures that make the fingertip useful.
Before You Read
When is a felon ready for drainage rather than warm soaks and reassessment?
Where should the incision go—and where must it not go?
What findings suggest extension into bone, tendon sheath, or the deep hand?
Why It Matters
A felon is an infection of the closed pulp compartments of the fingertip. Pressure can compromise local blood flow and spread infection to bone, tendon, or the distal interphalangeal joint; poor incision placement can create painful scarring or neurovascular injury.
When to Think of It
Severe throbbing pain, tense swelling, and focal tenderness of the volar fingertip pad—often after a puncture, splinter, or manicuring injury—should trigger the diagnosis. Fluctuance, visible pus, or a tense compartment favors drainage; early cellulitis without a collection may respond to conservative care.
Sick or Not Sick
The decisive call is whether a drainable collection is present and whether infection extends beyond the pulp. Immunocompromise, diabetes, systemic symptoms, lymphangitis, osteomyelitis concern, flexor sheath signs, or failed initial therapy lowers the threshold for hand consultation and admission.
The First Fifteen Minutes
For pain before anesthesia: acetaminophen 1,000 mg PO or ibuprofen 600 mg PO if renal function, GI risk, and pregnancy status permit; pain control facilitates a careful procedure.
Perform a digital block when drainage is needed: lidocaine 1% without epinephrine, approximately 3–5 mL total, injected at the base of the digit; anesthesia permits atraumatic decompression. Verify local maximum-dose policy.
If purulence, significant cellulitis, immunocompromise, or systemic illness is present: trimethoprim-sulfamethoxazole DS 160/800 mg, 1–2 tablets PO twice daily, or doxycycline 100 mg PO twice daily for MRSA-active outpatient therapy; add streptococcal coverage when needed with cephalexin 500 mg PO four times daily. Exact selection depends on local resistance and patient factors—check a reference.
If severe infection, failed oral therapy, or admission is required: vancomycin 15–20 mg/kg IV, with interval and monitoring guided by pharmacy/institutional protocol; it covers serious MRSA infection.
If tetanus status is incomplete or unknown and the wound is dirty: tetanus vaccine 0.5 mL IM, with tetanus immune globulin 250 units IM when the primary series is incomplete or unknown.
Definitive Care & Disposition
Use a lateral or volar-lateral incision along the noncontact surface, avoiding the central volar pad, digital neurovascular bundles, and the nail bed. Drain loculations, irrigate, and leave the wound open with a small dressing; routine packing is usually unnecessary and may increase tissue trauma. Obtain radiographs for foreign body, fracture, or osteomyelitis concern. Admit or consult hand surgery for extensive infection, necrosis, osteomyelitis, flexor tenosynovitis, immunocompromise, systemic illness, or failure of drainage. Recheck within 24–48 hours; elevate and begin gentle motion once appropriate.
How This One Kills
A midline volar incision can injure the sensory pulp and produce a painful scar, while inadequate decompression leaves a closed compartment infected and allows spread into the distal phalanx or tendon sheath.
The Atypical Presentation
In diabetes, vascular disease, or immunosuppression, severe infection may produce less erythema and less tenderness than expected. A puncture wound hidden under callus may be the only clue. Persistent pain after drainage, reduced distal sensation, drainage from a puncture site, or swelling extending proximally should prompt imaging and hand consultation rather than repeated bedside procedures.
Back to Our Patient
Back to the 34-year-old carpenter: his tense, exquisitely tender volar fingertip with three days of throbbing pain is a drainable felon until proven otherwise. After a digital block, the collection is decompressed through a lateral incision, irrigated, dressed, and cultured when clinically indicated; he receives tetanus-directed care and MRSA-active antibiotics because of surrounding cellulitis. He has no flexor sheath signs, systemic illness, or bone involvement, so he is discharged with elevation, wound instructions, and a 24–48-hour hand recheck.
Patient Presentation to Attending
“This is a 34-year-old carpenter with three days of worsening throbbing pain and tense swelling of the left index-finger pulp after a suspected splinter injury. He is afebrile and has focal volar pad tenderness with fluctuance, but no grouped vesicles, nail-fold collection, fusiform swelling, pain with passive extension, or proximal streaking. Sensation and capillary refill are intact, and there is no systemic illness. This is a drainable felon without current evidence of flexor tenosynovitis or osteomyelitis. I plan a digital block, lateral incision and drainage with irrigation, tetanus review, MRSA-active antibiotics for the surrounding cellulitis, and close hand follow-up.”
Study Directive
Sketch the fingertip compartments, digital neurovascular bundles, and safe incision zones.
Perform a simulated digital block and state the maximum lidocaine dose.
Compare felon, paronychia, herpetic whitlow, and flexor tenosynovitis from memory.
Review when antibiotics add benefit after drainage.
Create a 24-hour reassessment checklist: pain, swelling, drainage, sensation, perfusion, range of motion, and proximal spread.
Key Medications
Lidocaine 1% for digital block: approximately 3–5 mL total; do not exceed 4.5 mg/kg plain lidocaine or institutional maximum.
TMP-SMX DS 160/800 mg: 1–2 tablets PO twice daily; dose and duration vary by infection severity and renal function.
Doxycycline: 100 mg PO twice daily; avoid in pregnancy and use caution in children under 8 years.
Cephalexin: 500 mg PO four times daily when streptococcal coverage is needed; does not reliably cover MRSA.
Vancomycin: 15–20 mg/kg IV; pharmacy-guided dosing and monitoring are required.
Tetanus vaccine: 0.5 mL IM; tetanus immune globulin 250 units IM when indicated.
High-Yield Pearls
Herpetic whitlow is the felon mimic you must not incise: vesicles, burning pain, and often a history of exposure are the clues.
A felon can coexist with a paronychia, but the point of maximal tenderness determines the drainage approach.
Persistent pain after technically adequate drainage should trigger concern for osteomyelitis, retained foreign body, or a deeper-space infection.
The Mimics
Herpetic whitlow — grouped vesicles and burning pain; incision can cause viral inoculation and delayed healing.
Paronychia — infection centered at the nail fold rather than the deep pulp; a distal volar incision will miss the collection.
Felon with osteomyelitis — persistent pain, swelling, or bony destruction on imaging; simple drainage alone fails.
Flexor tenosynovitis — fusiform swelling, flexed posture, and pain with passive extension; requires urgent deep-space management rather than fingertip drainage.
Board Question
Which incision is preferred for drainage of an uncomplicated felon?
AMidline longitudinal incision through the volar fingertip
BTransverse incision across the fingertip pad
CLateral or volar-lateral incision on the noncontact surface
DIncision directly through the nail plate
Reveal answer
Correct: C
A lateral or volar-lateral approach avoids the central weight-bearing pulp and reduces the risk of painful scarring and neurovascular injury. Midline volar incisions should generally be avoided.
Provides an emergency-focused guide to distinguishing felon from paronychia and choosing antibiotics versus drainage, including safe incision approaches that minimize neurovascular injury.
4 of 5
Paronychia and Felon
Paronychia and felon are common, but their anatomy determines the procedure. A nail-fold abscess needs limited drainage; a pulp-space abscess needs a...
Also known asnail fold infection · finger pulp infection · felon
A 41-year-old woman places her right thumb on the counter, the nail fold swollen and red beside a torn hangnail. She says it began as tenderness yesterday but now throbs whenever she grips a coffee cup. The fingertip pad is still soft, and there is no fever or red streak traveling up the hand. The bedside decision is whether this is still a superficial nail-fold problem—or whether infection has crossed into the pulp.
Before You Read
How do you distinguish paronychia from a felon at the bedside?
Which collections need drainage, and which can be treated without an incision?
What complication follows missed spread beneath the nail or into the pulp?
Why It Matters
Paronychia and felon are common, but their anatomy determines the procedure. A nail-fold abscess needs limited drainage; a pulp-space abscess needs a different approach, and missing the transition risks nail deformity, osteomyelitis, or loss of fingertip function.
When to Think of It
Paronychia causes erythema, swelling, tenderness, and sometimes fluctuance along the proximal or lateral nail fold. A felon causes tense, throbbing tenderness in the volar pulp. Chronic paronychia is usually a relapsing inflammatory process associated with wet work and irritants rather than a simple acute abscess.
Sick or Not Sick
The key call is the anatomic compartment involved: nail fold only, subungual space, or deep pulp. Drainage is indicated for a visible abscess; diffuse cellulitis without collection can be treated medically, while felon, tendon-sheath signs, systemic illness, or bone involvement requires escalation.
The First Fifteen Minutes
For pain: acetaminophen 1,000 mg PO or ibuprofen 600 mg PO if no renal, GI, anticoagulation, or pregnancy contraindication; analgesia improves tolerance of examination and drainage.
For an acute early paronychia without fluctuance: warm water soaks for 10–15 minutes, 3–4 times daily, plus topical mupirocin 2% ointment applied to the nail fold 2–3 times daily; warmth improves local drainage and mupirocin reduces superficial bacterial burden.
If a fluctuant paronychial abscess is present: perform a digital block with lidocaine 1% without epinephrine, approximately 3–5 mL total, then gently elevate the nail fold with a small instrument; anesthesia permits controlled drainage while preserving the nail.
If cellulitis extends beyond the nail fold or risk for MRSA is substantial: doxycycline 100 mg PO twice daily or TMP-SMX DS 160/800 mg, 1–2 tablets PO twice daily; add streptococcal coverage when indicated. Verify local resistance, pregnancy status, and renal dosing.
If a dirty wound and incomplete or unknown tetanus series: tetanus vaccine 0.5 mL IM; add tetanus immune globulin 250 units IM when the primary series is incomplete or unknown.
Definitive Care & Disposition
Drain a localized abscess with a nail-fold elevation or small incision; avoid unnecessary nail removal. Remove part or all of the nail only when the collection is subungual, extensive, or inaccessible otherwise. For chronic paronychia, stop irritant exposure, keep hands dry, use protective gloves, and consider topical corticosteroid therapy rather than repeated antibiotics; persistent or atypical lesions need dermatology evaluation. Assess for a felon, herpetic whitlow, foreign body, and flexor tenosynovitis. Discharge uncomplicated cases with warm soaks, dressing, elevation, and a 24–48-hour recheck; admit or consult hand surgery for deep infection, systemic illness, immunocompromise, failed drainage, or osteomyelitis concern.
How This One Kills
The common failure is draining only the nail fold while missing a concurrent felon; pressure and infection then remain trapped in the pulp, causing escalating pain and possible distal phalanx infection.
The Atypical Presentation
Chronic paronychia may have minimal pus, a boggy or absent cuticle, and recurrent swelling rather than an acute fluctuant abscess. In diabetes or immunosuppression, acute infection may spread with little fever. When the nail is distorted, the lesion recurrent, or symptoms fail to improve after appropriate drainage and protection from irritants, reconsider the diagnosis and arrange specialty follow-up.
Back to Our Patient
Back to the 41-year-old woman: her redness and fluctuance are confined to the lateral nail fold, while the volar pulp remains soft and nontender, identifying an acute paronychial abscess rather than a felon. After a digital block, the nail fold is gently elevated and drained without unnecessary nail removal; she receives local wound care, tetanus review, and instructions for warm soaks and a 24–48-hour reassessment. Because there is no spreading cellulitis, systemic illness, or deep-space involvement, she is discharged with outpatient follow-up.
Patient Presentation to Attending
“This is a 41-year-old woman with one day of worsening right-thumb pain and swelling after a torn hangnail. She is afebrile, with focal fluctuance and erythema along the lateral nail fold; the volar pulp is soft and nontender, there are no vesicles, no proximal streaking, and no pain with passive digit extension. This is an acute paronychial abscess without evidence of felon or flexor tenosynovitis. I plan digital anesthesia, gentle nail-fold elevation and drainage, tetanus review, local wound care, and discharge with warm soaks and close reassessment.”
Study Directive
On a hand diagram, label the nail fold, subungual space, and pulp compartments.
Practice deciding “soaks, nail-fold drainage, or felon drainage” in five brief cases.
Review the visual differences between acute bacterial paronychia, chronic paronychia, herpetic whitlow, and subungual hematoma.
Memorize the digital-block dose and the indications for tetanus immune globulin.
Build discharge instructions that include dressing care, return precautions, motion, elevation, and timing of reassessment.
Key Medications
Lidocaine 1% digital block: approximately 3–5 mL total; respect the maximum plain-lidocaine dose of 4.5 mg/kg and institutional limits.
Mupirocin 2% ointment: apply to the affected nail fold 2–3 times daily; duration varies.
Doxycycline: 100 mg PO twice daily; avoid in pregnancy and generally in children under 8 years.
TMP-SMX DS 160/800 mg: 1–2 tablets PO twice daily; adjust for renal function and verify local protocol.
Cephalexin: 500 mg PO four times daily when streptococcal coverage is needed; inadequate for reliable MRSA coverage.
Tetanus vaccine: 0.5 mL IM; tetanus immune globulin 250 units IM when indicated.
High-Yield Pearls
The site of maximal tenderness—not the amount of redness—identifies the infected compartment.
Chronic paronychia is usually an irritant/inflammatory disorder; repeated antibiotic courses perpetuate the wrong treatment.
Absence of fluctuance means drainage may harm more than help; use warm soaks and reassessment for early disease.
The Mimics
Herpetic whitlow — grouped vesicles or erosions with burning pain; incision risks viral inoculation and bacterial superinfection.
Felon — maximal tenderness and fluctuance in the volar pulp; nail-fold drainage will not decompress it.
Subungual hematoma — blood beneath the nail after trauma, often without infectious erythema; antibiotics or fold incision do not treat the pressure.
Squamous cell or other chronic nail-fold lesion — persistent, atypical, or recurrent unilateral disease; repeated “infection” treatment delays diagnosis.
Board Question
A patient has a fluctuant abscess limited to the lateral nail fold, with a soft, nontender volar pulp. What is the best treatment?
AMidline volar fingertip incision
BNail-fold elevation or limited drainage under digital anesthesia
CImmediate hand-surgery admission for tendon-sheath irrigation
DIncision and drainage of the finger pad
Reveal answer
Correct: B
A localized paronychial abscess is drained through the nail fold, often by gentle elevation at the nail margin. A volar incision is reserved for a felon and can create unnecessary injury when the pulp is uninvolved.
A focused emergency medicine reference on distinguishing paronychia from felon and choosing drainage technique, antibiotics, and appropriate follow-up.
Contemporary multicenter data on purulent paronychia can help contextualize bedside drainage and antibiotic decisions in current practice.
5 of 5 · Procedure Corner
Felon Incision and Drainage
Established felon with a fluctuant pulp-space abscess, purulent drainage, or significant pressure pain/swelling.Failure of appropriate early treatment for...
Also known asfelon drainage · digital pulp abscess · finger pulp abscess
Established felon with a fluctuant pulp-space abscess, purulent drainage, or significant pressure pain/swelling.
Failure of appropriate early treatment for cellulitis without abscess, or progression despite conservative care.
Consider hand-surgery consultation before drainage when infection may extend to bone, tendon sheath, joint, or deep palmar spaces.
Contraindications
No absolute contraindication when urgent source control is needed; obtain specialist help rather than delaying care for complex cases.
Avoid bedside drainage as the sole treatment for suspected flexor tenosynovitis, septic arthritis, osteomyelitis, ischemia, extensive tissue necrosis, or rapidly progressive infection.
Use caution with impaired perfusion, significant immunocompromise, anticoagulation, or an uncooperative patient; these may warrant operative management or specialty consultation.
Do not incise a nonfluctuant pulp abscess without reassessing the diagnosis, using ultrasound, or obtaining consultation.
Local anesthetic without epinephrine for digital block; use a dosing reference for maximum safe dose. Avoid injecting directly into the infected pulp.
Small-gauge needle and syringe for the block; consider a winged infusion set or needleless anesthetic technique.
Finger tourniquet or sterile Penrose drain, used briefly with documented application and removal time.
No. 11 blade or small scalpel, hemostat, irrigation syringe with sterile saline, and culture swab if indicated.
Packing or a small wick only when needed to maintain drainage; bulky dressing and splinting materials.
Assess and document sensation, capillary refill, range of motion, tendon function, and signs of proximal spread before anesthesia.
Steps
Confirm the diagnosis and extent of infection. Examine for fluctuance, drainage, digital tenderness beyond the pulp, Kanavel signs, joint involvement, foreign body, or systemic illness. Use ultrasound if fluctuance is uncertain.
Explain the procedure, alternatives, expected drainage, risks of pain, bleeding, nerve or vascular injury, incomplete drainage, scarring, and need for operative treatment. Obtain consent.
Perform a digital nerve block, allowing adequate time for onset. Recheck anesthesia before incision; avoid injecting into the abscess cavity.
Position the hand with the affected fingertip supported and the neurovascular structures visible and accessible. Prep widely and apply a short-duration tourniquet if needed for visualization.
Choose a longitudinal incision over the point of maximal fluctuance along a lateral or midaxial aspect of the distal digit, avoiding the central volar pad, nail bed, distal interphalangeal crease, and expected digital neurovascular bundles. For a thumb, select the safest lateral trajectory based on anatomy and abscess location.
Make a controlled longitudinal incision through the skin and abscess wall. Avoid a transverse incision across the pulp, “fish-mouth” excision, blind deep probing, and unnecessary tissue excision.
Allow spontaneous drainage, then gently break loculations with a blunt hemostat only as far as needed. Do not aggressively dissect toward bone, tendon, or the neurovascular bundle.
Irrigate the cavity with sterile saline until gross purulence and debris are cleared. Obtain a culture when infection is severe, recurrent, atypical, immunocompromised, or not responding to initial therapy; routine culture is not required for every uncomplicated case.
Release the tourniquet and confirm hemostasis and distal perfusion. Leave the incision open for drainage; use a small loose wick only if the cavity is deep or likely to seal prematurely.
Apply a nonadherent dressing and light bulky wrap. Reassess sensation, capillary refill, and active motion after the procedure.
Confirmation & Success Criteria
Purulent material is released and loculations are adequately decompressed.
Pulp pressure and throbbing pain improve, with no residual tense fluctuant pocket.
The wound remains open enough to drain, without excessive tissue disruption.
Distal perfusion, sensation, and active tendon function are preserved.
No clinical evidence remains of flexor tenosynovitis, septic joint, deep-space infection, ischemia, or uncontrolled proximal spread.
Complications & Rescue
Incomplete drainage or persistent fluctuance: Reassess with ultrasound, repeat limited drainage if appropriate, and obtain hand-surgery consultation for a deep, multiloculated, recurrent, or anatomically uncertain abscess.
Bleeding or hematoma: Direct pressure, elevation, and reassessment of anticoagulation or coagulopathy; persistent bleeding warrants specialty evaluation.
Digital nerve or artery injury: Stop dissection, document the deficit, reassess perfusion, and urgently consult hand surgery.
Worsening pain, spreading erythema, fever, lymphangitis, or systemic toxicity: Evaluate for deeper infection, obtain appropriate labs/imaging, start empiric antibiotics when indicated, and involve hand surgery.
Flexor tenosynovitis, septic arthritis, osteomyelitis, or deep-space extension: Do not repeatedly probe or manage with bedside drainage alone; arrange urgent specialty evaluation and operative source control.
Delayed healing, scarring, or recurrent infection: Ensure wound reassessment, address retained foreign body or chronic conditions, and consider culture-directed treatment.
Local-anesthetic toxicity or vasovagal symptoms: Stop injection, support airway and circulation, and manage according to local toxicity and resuscitation protocols.
Aftercare & Documentation
Elevate the hand and perform warm-water soaks or prescribed wound care several times daily when appropriate; replace the dressing after cleansing and keep the wound open to drain.
Arrange wound reassessment within 24–48 hours, sooner for worsening pain, fever, spreading redness, impaired motion, numbness, discoloration, or recurrent swelling.
Use antibiotics selectively based on cellulitis, systemic illness, immunocompromise, bite or contaminated mechanism, treatment failure, or concern for deeper infection; follow local antimicrobial guidance and adjust to cultures when obtained.
Document diagnosis and extent, neurovascular and tendon examination before and after the procedure, consent, anesthetic and dose, tourniquet use and removal, incision location, amount and character of drainage, loculation management, irrigation, packing, cultures, dressing, tolerance, complications, and follow-up plan.
Provide tetanus assessment and prophylaxis when indicated.
Yesterday’s Differential
The daily puzzle — from editions past
A quick test of recall from prior editions. Commit to an answer before you check.
From yesterday's edition
A 60-year-old chronic smoker presents with mild chest pain and shortness of breath. He mentions an episode of severe chest pain about two weeks ago for which he never sought care. What’s the diagnosis, and the first move?
Check your answer
Left Ventricular Aneurysm. Get and compare a prior ECG and apply the T/QRS ratio before committing. An unchanged tracing with well-formed Q waves, small T waves, and no reciprocal change supports old aneurysm and spares the patient reperfusion therapy; any dynamic change or high clinical suspicion means treat as acute STEMI.
From the September 5 edition
Today, three days ago: Propofol. What’s the adult ED dose, and the contraindication you’d most regret missing?
Check your answer
Procedural sedation: 0.5–1 mg/kg IV, then 0.25–0.5 mg/kg increments. Post-intubation sedation: commonly 5–50 mcg/kg/min infusion titrated to sedation/BP. Hemodynamic instability/shock relative, egg/soy allergy no longer absolute in many policies but check local guidance, hypersensitivity.
From the August 29 edition
A 5-year-old with fever refuses to walk. Temperature is 39°C, CRP is elevated, and passive hip motion is severely painful. Ultrasound shows a hip effusion. What is the next best step?
ADischarge with ibuprofen and 48-hour follow-up
BMRI before any invasive procedure
CUrgent orthopedic consultation for arthrocentesis and drainage
DOral amoxicillin for presumed osteomyelitis
Reveal answer
Correct · C
Fever, inability to bear weight, elevated inflammatory markers, and severe passive-motion pain strongly suggest septic arthritis. Aspiration and source control should not be delayed for MRI.
Journal Watch
From the FOAMed wire
Notable posts and reviews from the last week, ranked by relevance to today’s lead and source trust.
Welcome back to Rebel MIND, the podcast where we sharpen the person behind the practitioner. MIND stands for Mastering Internal Negativity during Difficulty. This series emphasizes productivity, provider performance, and team optimization to ensure we are at our best during...
Podcast Picks
Two for the shift
Critical Care Perspectives in Emergency Medicine2026-09-01
Brain damage and death from ischemic encephalopathy is common after cardiac arrest. Animal studies and limited observational studies suggest that high oxygen exposure after ROSC may result in neuronal death. As such, it is hypothesized that limiting oxygen exposure (conservative oxygen) many attenuate reperfusion injury and improve outcomes. At present,...
Source
Critical Care Perspectives in Emergency Medicine
Published
2026-09-01
Host
Critical Care Perspectives in Emergency Medicine, Critical Care Perspectives in Emergency Medicine
Jan and Swami kick off the month with a complex case of vent management, Chris Reilly and Mike Weinstock talk radiology risk management, Al Sacchetti educates us on glymphatics, while Reuben Strayer and Brian Driver...
Pharmacology Corner
Two drugs for the shift
One antimicrobial and one other ED workhorse — selected daily, with sources and last-reviewed dates so every dose is cross-checkable.
Antimicrobial of the Day
Clindamycin
Lincosamide antibiotic; toxin-suppressing protein synthesis inhibitor
Indication
Adjunctive toxin suppression in necrotizing fasciitis or streptococcal toxic shock; anaerobic and gram-positive coverage in selected dental, skin, and soft tissue infections; alternative in some beta-lactam allergy scenarios.
What’s your dose? — reveal dosing & cautions
ED Dose
600–900 mg IV q8h for severe infection. 300–450 mg PO q6–8h for outpatient SSTI/dental infections when appropriate.
Renal Adjustment
No renal dose adjustment.
Contraindications
Known clindamycin allergy; history of severe C. difficile is a major caution.
Interactions
Neuromuscular blockers may be potentiated; erythromycin antagonism possible in vitro.
Monitoring
Diarrhea/C. difficile risk, LFTs and CBC with prolonged courses, local resistance patterns for MRSA.
ED Pearl
In suspected nec fasc or streptococcal toxic shock, clindamycin is not there for coverage breadth — it is there to suppress toxin production while definitive source control happens.
Hyperkalemia intracellular shift with dextrose support, DKA/HHS insulin infusion after potassium assessment, and severe hyperglycemia protocols.
What’s your dose? — reveal dosing & cautions
ED Dose
Hyperkalemia: 5–10 units IV with dextrose unless already markedly hyperglycemic. DKA: 0.1 units/kg/h IV infusion after confirming K is adequate; some protocols omit bolus.
Renal Adjustment
Higher hypoglycemia risk in renal failure; consider lower hyperkalemia dose and prolonged glucose monitoring.
Contraindications
Hypoglycemia; DKA insulin should be delayed if K <3.3 mEq/L until potassium repletion begins.
Interactions
Beta-blockers mask hypoglycemia; other glucose-lowering drugs increase hypoglycemia risk.
Monitoring
Glucose q30–60 min after hyperkalemia therapy, potassium, anion gap/ketones in DKA, mental status.
ED Pearl
The dangerous part of insulin for hyperkalemia is delayed hypoglycemia after the ECG looks better — monitor glucose long enough, especially in renal failure.
For educational use only. Verify dosing against the FDA label and your institution’s pharmacy resources before administering.
ECG of the Day
Electrolyte
Hyperkalemia
Peaked T waves are an early warning; QRS widening and sine-wave morphology are the pre-arrest findings that demand immediate calcium.
The Tracing
A 68-year-old dialysis patient arrives weak and nauseated after missing dialysis. The monitor shows a slow wide-complex rhythm. The 12-lead has tall narrow-based T waves that look too sharp for ischemia, PR prolongation, flattening P waves, and a QRS that is beginning to widen in the precordial leads. The nurse is waiting for the chemistry panel.
Tall, narrow-based, symmetric peaked T waves, often best seen in the precordial leads
Progressive PR prolongation and P-wave flattening or loss as potassium rises
QRS widening that can merge with T waves into a sine-wave pattern in severe toxicity
Bradyarrhythmias, escape rhythms, bundle branch blocks, or pseudo-STEMI patterns may occur
ECG severity does not perfectly correlate with the serum potassium value
Pearls
ECG changes from hyperkalemia are a calcium indication. Stabilize the myocardium first, then shift and remove potassium.
Do not wait for the lab value when the ECG and story fit; hemolysis delays can cost the patient the arrest window.
Hyperkalemia can mimic STEMI, Brugada, VT, and bundle branch block. A dialysis or renal-failure context should make potassium one of the first reflex diagnoses.
Pitfalls
A normal ECG does not exclude dangerous hyperkalemia. Treat the patient, potassium value, and trend, not the tracing alone.
Albuterol, insulin, bicarbonate, and dialysis move or remove potassium; only calcium stabilizes the membrane immediately.
Peaked T waves from hyperkalemia are usually narrow and tented; ischemic hyperacute T waves tend to be broader and regional.
At the Bedside
Give IV calcium immediately for ECG changes or instability, then insulin/dextrose and other shifting therapies while arranging definitive potassium removal. Place on continuous monitoring and repeat ECG after calcium.
For educational use only. Verify ECG interpretation against the LITFL entry and your institution’s practice before clinical decision-making.
Case of the Day
From the lead · SCIWORA
Self-Examination
Test Your Understanding
A 12-year-old develops bilateral hand paresthesias after cervical trauma. CT shows no fracture or dislocation, but symptoms persist. What is the next best step?
ARemove the cervical collar after a normal CT
BFlexion-extension radiographs immediately
CUrgent MRI of the cervical spine
DHigh-dose methylprednisolone infusion
Reveal answer
Correct answer · C
Urgent MRI of the cervical spine. Persistent neurologic findings after trauma require evaluation for cord edema, contusion, disc herniation, or ligamentous injury not visible on CT. Routine steroid therapy is not recommended, and flexion-extension imaging is not the acute next step.
Study Pace4 topics today; Issue 56 of 94 — Orthopedics (Weeks 30 B-31 A)Deadline · June 1, 2026