The Daily Differential — Friday, April 24, 2026

2 of 5

Pediatric Appendicitis

Appendicitis is the most common pediatric surgical emergency, and delayed diagnosis increases perforation, abscess, and sepsis risk. Young children often...

At the Bedside

History
Classic migration of pain from periumbilical to RLQ may be absent.
Ask about anorexia, vomiting, fever, pain with walking/jumping, dysuria, diarrhea/constipation.
In toddlers/small children: irritability, limp, refusal to eat, diffuse pain may predominate.
Exam
RLQ tenderness, guarding, rebound, pain with hopping/coughing.
Rovsing, psoas, obturator may help but are not definitive.
Assess hydration and signs of perforation: diffuse peritonitis, toxic appearance.
GU exam when appropriate; consider torsion, hernia.
Differential to actively consider
Gastroenteritis, mesenteric adenitis, constipation, UTI, testicular torsion, ovarian torsion, PID, intussusception, DKA.
Workup
CBC, CRP may support diagnosis but cannot rule it out.
BMP if dehydrated or vomiting.
UA to evaluate UTI; mild pyuria can still occur with appendicitis.
Pregnancy test in menstruating/postmenarchal patients.
Imaging
First-line: graded-compression ultrasound in most children.
If nondiagnostic and suspicion remains moderate/high: MRI where available, or CT abdomen/pelvis with IV contrast depending on local pathway.
Avoid reflexive CT if ultrasound is nondiagnostic but the child is clinically low risk.
Scoring / risk stratification
Pediatric Appendicitis Score or Alvarado can support decisions, not replace clinical judgment.
ED treatment
NPO, IV fluids, analgesia, antiemetics.
Early pain control does not obscure diagnosis.
If likely appendicitis or perforation: consult pediatric surgery.
Start antibiotics when diagnosis is likely, especially with perforation/sepsis concern.
Disposition
Surgical admission for confirmed/highly suspected appendicitis.
Observation with serial exams/imaging pathway may be appropriate for equivocal cases.
Discharge only if appendicitis is felt unlikely, child is well appearing, tolerating PO, and family has strict return precautions.

A Classic Presentation

A 10-year-old boy presents with 18 hours of abdominal pain that began periumbilically and now localizes to the RLQ. He has anorexia, one episode of vomiting, and refuses to hop off the bed due to pain. Exam shows focal RLQ tenderness with guarding; WBC is 14,000 and ultrasound reveals a noncompressible 8 mm tubular structure with periappendiceal fat stranding. He receives IV fluids, morphine, ondansetron, ceftriaxone plus metronidazole, and pediatric surgery admits him for appendectomy.

Study Directive

Memorize the pediatric appendicitis imaging ladder: US first, then MRI/CT if persistent concern.
Practice counseling a parent after a nondiagnostic ultrasound with explicit return precautions.
Review 5 pediatric RLQ pain cases and list the alternate diagnoses you must not miss.
Learn your local pediatric appendicitis antibiotic pathway today.
Do 10 peds abdominal pain questions, focusing on perforation and equivocal imaging.

Key Medications

Normal saline 20 mL/kg IV bolus in dehydrated/ill child; repeat as needed.
Acetaminophen 15 mg/kg PO/IV (max adult dose limits apply).
Ibuprofen 10 mg/kg PO if oral tolerated.
Morphine 0.05–0.1 mg/kg IV.
Ondansetron 0.15 mg/kg IV/PO (max commonly 4–8 mg depending on age/weight and route; check institutional practice).
Common pre-op antibiotics:
Ceftriaxone 50 mg/kg IV (max 2 g) + metronidazole 30 mg/kg IV (max 1.5 g), often used for uncomplicated/complicated appendicitis pathways.
Cefoxitin 40 mg/kg IV (max 2 g) is another common option.
Regimens vary by institution and perforation status—check pediatric surgery protocol.

High-Yield Pearls

Perforation risk is higher in younger children because symptoms are less classic and diagnosis is often delayed.
Pain with hopping, coughing, or walking is a practical bedside clue for peritoneal irritation.
Mild pyuria can occur from periappendiceal inflammation; don’t anchor on UTI alone.

Board Question

A 9-year-old girl has RLQ pain and vomiting. Ultrasound is nondiagnostic, but she remains tender with pain on walking and rising inflammatory markers. What is the best next step?

ADischarge with stool softener
BRepeat exam only in 1 week
CFurther imaging/observation because appendicitis is still possible
DRule out appendicitis because ultrasound was negative

Reveal answer

Correct: C

Further imaging/observation because appendicitis is still possible A nondiagnostic ultrasound does not exclude appendicitis. Persistent clinical concern warrants serial exams, MRI/CT depending on local resources, and surgical input rather than premature discharge.

3 of 5

Approach to Acute Dyspnea and Respiratory Distress

Acute dyspnea is a high-risk chief complaint spanning airway emergencies, shock states, severe metabolic disease, and primary cardiopulmonary pathology. A...

At the Bedside

Immediate assessment
Appearance first: can the patient speak, protect airway, maintain oxygenation, and ventilate?
Vital signs, mental status, work of breathing, pulse ox, end-tidal CO2 if available.
Place on monitor; position upright if tolerated.
Resuscitation framework
Airway: suction, adjuncts, prepare for intubation if tiring, altered, or failing.
Breathing: oxygen, NIV, bronchodilators, decompression, or mechanical ventilation depending on cause.
Circulation: consider shock from PE, tamponade, sepsis, tension PTX, massive MI.
Rapid pattern recognition
Wheeze: asthma/COPD, anaphylaxis.
Rales: CHF, pneumonia.
Silent chest: near-fatal asthma, severe obstruction.
Stridor: upper airway obstruction.
Unilateral absent breath sounds: pneumothorax/mainstem issue.
Kussmaul respirations: metabolic acidosis.
Focused history
Onset sudden vs gradual; chest pain; fever; cough; trauma; allergen exposure; leg swelling; orthopnea; toxin exposure; aspiration; pregnancy; smoking; CHF/COPD history.
Key bedside tests
POCUS:
Lung sliding absent: possible pneumothorax.
B-lines: pulmonary edema.
Consolidation/air bronchograms: pneumonia.
Pleural effusion.
Cardiac views for LV function, RV strain, pericardial effusion.
IVC can support volume assessment but should not drive management alone.
ECG for ischemia, dysrhythmia, right-heart strain.
CXR for edema, infiltrate, PTX, effusion.
VBG/ABG if hypercapnia, fatigue, severe illness, or acid-base concern.
Labs guided by differential: CBC, BMP, troponin, BNP, D-dimer only if appropriate pretest probability pathway, lactate, viral testing.
Cause-based initial treatment
Asthma/COPD: bronchodilators, steroids, magnesium in severe asthma, NIV in COPD.
CHF/pulmonary edema: NIV, nitrates if hypertensive, diuresis.
Pneumothorax: needle/finger thoracostomy if tension physiology.
Anaphylaxis: IM epinephrine first.
PE: oxygen, anticoagulation if appropriate, reperfusion for massive/high-risk PE.
Pneumonia/sepsis: antibiotics, oxygen, fluids if septic but be cautious in cardiogenic states.
Upper airway obstruction: prepare difficult airway, call help early.
Disposition
ICU for escalating oxygen/NIV/intubation need, hypercapnia, severe work of breathing, hemodynamic instability, high-risk diagnoses.
Observation or floor for improving but still requiring oxygen/workup.
Discharge only if symptoms resolve, dangerous causes excluded, vitals stable, and reliable follow-up.

A Classic Presentation

A 67-year-old woman presents in severe respiratory distress, speaking one-word sentences, RR 34, BP 198/112, SpO2 82% on room air. She has diffuse crackles, JVD, and bilateral B-lines on lung ultrasound. She is placed on BiPAP, given high-dose nitrates and IV furosemide, and rapidly improves. The key move was identifying acute cardiogenic pulmonary edema rather than treating all dyspnea as “COPD.”

Study Directive

Build a one-page dyspnea algorithm from memory: airway, oxygenation, ventilation, obstructive vs parenchymal vs cardiac vs metabolic.
Practice interpreting 10 lung POCUS clips: B-lines, PTX, consolidation, effusion.
Review NIV indications and contraindications for COPD vs cardiogenic pulmonary edema.
Do a timed oral boards scenario on crashing dyspnea with three causes: asthma, CHF, tension PTX.
Memorize immediate treatments for the “can’t miss” dyspnea killers: anaphylaxis, tension PTX, flash pulmonary edema, PE.

Key Medications

Oxygen: titrate to target; in most adults aim SpO2 ≥92–94%, but for chronic CO2 retainers often target 88–92%.
Albuterol 2.5–5 mg nebulized q20 min x3 or continuous 10–15 mg/hr in severe bronchospasm.
Ipratropium 0.5 mg nebulized q20 min x3.
Methylprednisolone 125 mg IV or prednisone 40–60 mg PO for asthma/COPD exacerbation.
Magnesium sulfate 2 g IV over 15–20 min for severe asthma.
Epinephrine for anaphylaxis: 0.3–0.5 mg IM of 1 mg/mL (1:1000) solution, repeat q5–15 min as needed.
Nitroglycerin:
SL 0.4 mg q5 min x3 for hypertensive pulmonary edema/ischemia if appropriate.
IV infusion commonly starts 20–40 mcg/min and is rapidly titrated; dosing varies by scenario and local practice.
Furosemide 40–80 mg IV in volume-overloaded CHF; dose varies based on prior home diuretic exposure.
Heparin for PE: bolus/infusion depends on protocol—check institutional dosing.
Ketamine for delayed sequence intubation/severe agitation with respiratory distress: 1–2 mg/kg IV; context dependent.
RSI medications and ventilator settings should follow airway protocol.

High-Yield Pearls

Dyspnea is not always pulmonary: severe metabolic acidosis, ACS, tamponade, and sepsis commonly present with respiratory distress.
POCUS compresses time to diagnosis: B-lines, pleural sliding, RV strain, and LV function can redirect management within minutes.
Rising CO2 in a tiring asthmatic is ominous; “normalizing” PaCO2 may indicate impending failure, not improvement.

Board Question

A patient with acute dyspnea is anxious, tachypneic, hypoxic, and has unilateral absent breath sounds with hypotension after a central line attempt. What is the next best step?

AObtain CT angiography
BStart heparin infusion
CImmediate decompression for tension pneumothorax
DGive IV furosemide

Reveal answer

Correct: C

Immediate decompression for tension pneumothorax This is a clinical diagnosis. In an unstable patient, treatment should not wait for imaging because obstructive shock can rapidly progress to arrest.

4 of 5

Aspiration Pneumonia

Aspiration pneumonia is common in older adults, intoxicated patients, stroke patients, and those with swallowing impairment. Distinguishing aspiration...

At the Bedside

Key distinction
Aspiration pneumonitis: chemical injury after witnessed macroaspiration; often abrupt hypoxemia and infiltrates, may improve with supportive care alone.
Aspiration pneumonia: bacterial infection after aspiration, often more subacute with fever, cough, leukocytosis, and infiltrate in dependent lung segments.
History
Altered mental status, seizure, alcohol/drug intoxication, stroke, dysphagia, GERD, vomiting, tube feeds, poor dentition.
Witnessed aspiration event? Time course matters.
Exam
Fever, tachypnea, hypoxemia, crackles; assess for sepsis and respiratory failure.
Consider foreign body aspiration if abrupt unilateral symptoms.
Workup
CXR: infiltrate in dependent segments (posterior upper lobes or superior/lateral basal lower lobes depending on position).
CBC, BMP; lactate and blood cultures if septic/ill.
Viral testing if clinically relevant.
POCUS may show focal consolidation with dynamic air bronchograms.
CT chest usually not needed initially unless alternative diagnosis or complication suspected.
Management
Supportive care: oxygen, suctioning, aspiration precautions, treat bronchospasm if present.
Antibiotics for likely bacterial aspiration pneumonia, especially if fever, leukocytosis, persistent infiltrate, toxic appearance, or no rapid improvement after aspiration event.
Do not routinely add anaerobic coverage for all aspiration pneumonia; reserve for lung abscess, empyema, severe periodontal disease/putrid sputum, or selected necrotizing infections depending on local guidance.
Swallow evaluation may be needed inpatient.
Disposition
Admit if hypoxemic, frail, septic, unable to tolerate PO, significant comorbidity, or unreliable care setting.
ICU if escalating oxygen need, sepsis shock, or impending respiratory failure.

A Classic Presentation

An 81-year-old nursing home resident with prior stroke and dysphagia is brought in for fever, cough, and new oxygen requirement two days after choking during a meal. Exam shows tachypnea, crackles at the right base, and SpO2 88% on room air. Chest x-ray reveals a right lower lobe infiltrate. Because the course is subacute with infectious features rather than immediate post-aspiration pneumonitis alone, he is started on IV ampicillin-sulbactam and admitted for oxygen, swallow assessment, and monitoring.

Study Directive

Write out the differences between aspiration pneumonitis and aspiration pneumonia from memory: timing, fever, leukocytosis, antibiotics, trajectory.
Review your hospital’s preferred antibiotics for community vs hospital-associated aspiration syndromes.
Practice identifying dependent-lobe patterns on 5 chest radiographs.
Make a checklist for aspiration risk factors you will ask on every altered mental status patient.
Do 5 questions focused on when not to give antibiotics after aspiration.

Key Medications

Ampicillin-sulbactam 3 g IV q6h.
Ceftriaxone 1–2 g IV daily + azithromycin 500 mg IV/PO daily if treating as CAP and aspiration is in differential.
Amoxicillin-clavulanate 875/125 mg PO q12h for selected outpatient cases.
Piperacillin-tazobactam 4.5 g IV q6h for severe hospital-associated aspiration risk or broad coverage need.
Clindamycin 600 mg IV q8h is not routine first-line but may be considered in selected anaerobic-dominant situations; practice varies.
Oxygen as needed; bronchodilators if bronchospasm.
Duration of therapy varies with severity/response and complications; check current guideline/local policy.

High-Yield Pearls

Dependent-lobe infiltrates support aspiration, but location depends on patient position during the event.
“Aspiration” does not automatically mean anaerobes; routine broad anaerobic coverage is often unnecessary.
Poor mental status and dysphagia are risk factors not just for aspiration event, but also for recurrence after discharge.

Board Question

A 72-year-old man aspirates during vomiting after alcohol intoxication and develops hypoxemia with a new infiltrate on chest x-ray within hours. He is afebrile and improves significantly with oxygen over the next 12 hours. Which is the best interpretation?

AMandatory prolonged anaerobic antibiotics
BChemical aspiration pneumonitis may be the primary process
CPulmonary embolism is most likely
DEndocarditis with septic emboli

Reveal answer

Correct: B

Chemical aspiration pneumonitis may be the primary process A witnessed aspiration event followed by rapid respiratory symptoms and early improvement is more consistent with aspiration pneumonitis. Not all aspiration events require antibiotics; reassess trajectory and infection markers.

5 of 5

Empyema

Empyema is infected pleural fluid and a major complication of pneumonia with significant morbidity if drainage is delayed. Antibiotics alone are often...

At the Bedside

Clinical suspicion
Persistent fever, pleuritic chest pain, leukocytosis, or failure to improve after pneumonia treatment.
Consider in patients with known pleural effusion plus ongoing sepsis or respiratory symptoms.
Exam
Decreased breath sounds, dullness to percussion, asymmetric chest expansion.
Toxic appearance or sepsis in advanced cases.
Imaging
CXR may show pleural effusion.
Ultrasound is extremely helpful: confirms fluid, detects septations/loculations, guides thoracentesis/chest tube.
CT chest with contrast can define loculations, pleural thickening, and underlying pneumonia/abscess.
Diagnostic thoracentesis
Send pleural fluid for pH, glucose, LDH, protein, Gram stain/culture, cell count, and appearance.
Frank pus = empyema.
Complicated parapneumonic effusion/empyema is suggested by low pleural pH (<7.2), low glucose, positive Gram stain/culture, or loculations.
Treatment
Start IV antibiotics covering likely pneumonia pathogens; broaden for healthcare exposure or aspiration risk.
Drainage is indicated for empyema and most complicated parapneumonic effusions.
Tube thoracostomy is typical initial drainage; small-bore catheters are often effective, especially if image-guided.
If loculated or inadequately draining: consider intrapleural tPA/DNase per specialist guidance.
Thoracic surgery consult for VATS/decortication if persistent sepsis, loculated collections, trapped lung, or failed tube drainage.
Disposition
Admit all confirmed/suspected empyemas.
ICU if septic shock, significant respiratory failure, or need for urgent procedures in unstable patient.

A Classic Presentation

A 54-year-old man returns 6 days after being treated for pneumonia with persistent fevers, pleuritic chest pain, and worsening dyspnea. Chest x-ray shows an enlarging left pleural effusion; ultrasound demonstrates a complex septated collection. Thoracentesis yields cloudy fluid with low pH and positive Gram stain. He is started on broad IV antibiotics, a chest tube is placed for drainage, and thoracic surgery is consulted because loculations may require further intervention.

Study Directive

Memorize the pleural fluid findings that trigger drainage: pus, positive Gram stain/culture, low pH, loculations.
Review 3 ultrasound clips/images of simple vs complex pleural effusions.
Practice a verbal plan for suspected empyema: antibiotics, ultrasound, thoracentesis, chest tube, thoracic surgery.
Learn the contraindications and setup steps for bedside thoracentesis and tube thoracostomy.
Do 5 questions on parapneumonic effusions vs empyema and procedural decision-making.

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Mechanism Pearl of the Day: Several of today’s topics hinge on source control plus physiology support: blood loss in UGIB needs hemostasis, appendicitis needs operative control, aspiration pneumonia/empyema need infection control and drainage, and acute dyspnea demands you first stabilize oxygenation/ventilation while rapidly identifying the underlying mechanism.

Key Medications

Ampicillin-sulbactam 3 g IV q6h for community-acquired aspiration-associated pleuropulmonary infection.
Ceftriaxone 1–2 g IV daily + metronidazole 500 mg IV q8h is another common regimen.
Piperacillin-tazobactam 4.5 g IV q6h for severe or healthcare-associated infection.
Vancomycin: loading/maintenance vary by weight and renal function; check institutional protocol if MRSA risk.
Analgesia for chest tube:
Fentanyl 25–100 mcg IV titrated.
Lidocaine 1% local infiltration; max dose depends on whether epi is used—check reference.
Intrapleural tPA/DNase dosing varies by protocol/specialist service; do not improvise without local guidance.

High-Yield Pearls

Pleural pH <7.2 in parapneumonic effusion is a major clue that drainage is needed.
Ultrasound is more useful than plain radiography for detecting septations and guiding safe pleural procedures.
If pneumonia is not improving as expected, think effusion, empyema, abscess, resistant organism, or wrong diagnosis.

Board Question

A patient with pneumonia has a pleural effusion. Pleural fluid analysis shows pH 7.05, glucose 30 mg/dL, and positive Gram stain. What is the next best step?

AOral antibiotics and discharge
BRepeat chest x-ray in 1 month
CChest tube drainage plus antibiotics
DDiuresis alone

Reveal answer

Correct: C

Chest tube drainage plus antibiotics These findings indicate a complicated parapneumonic effusion/empyema. Antibiotics alone are insufficient because infected pleural space collections require drainage for source control.

TheDaily Differential

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At the Bedside

Study Directive

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Pediatric Appendicitis

Approach to Acute Dyspnea and Respiratory Distress

Aspiration Pneumonia

Empyema

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