The Daily Differential — Sunday, June 7, 2026

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Peripheral Arterial Disease

Peripheral arterial disease (PAD) is a marker of systemic atherosclerosis and strongly predicts myocardial infarction, stroke, and limb loss. In the ED, it...

At the Bedside

Typical symptoms: exertional calf/thigh/buttock claudication relieved by rest, rest pain, nonhealing wounds, cool feet, diminished pulses.
Red flags for acute limb ischemia instead of chronic PAD: sudden pain, pallor, pulselessness, paresthesia, paralysis, poikilothermia, poikilosis? (No—remember the real 6 P’s: pain, pallor, pulselessness, paresthesia, paralysis, poikilothermia).
Exam: pulse exam, cap refill, skin temp/color, dependent rubor, elevation pallor, femoral bruits, ulcers, gangrene. Compare both legs.
Diagnostics:
ABI is the key bedside/clinic test for chronic PAD; <0.90 supports PAD.
Duplex ultrasound can define lesions if needed.
In ED, if concern for acute limb ischemia: CTA runoff or arterial duplex, plus vascular surgery consultation.
Evaluate cardiovascular risk: glucose/A1c, lipids, renal function, smoking history; ECG if symptoms suggest CAD.
Management for chronic PAD:
Smoking cessation, statin, BP control, diabetes control, exercise therapy.
Antiplatelet therapy for symptomatic PAD.
Revascularization for lifestyle-limiting claudication despite optimal therapy or for chronic limb-threatening ischemia.
ED disposition:
Acute limb ischemia: emergent vascular consult, heparin if no contraindication, admit.
Chronic PAD without acute ischemia: outpatient vascular follow-up or admission if ulcers/infection/critical ischemia, severe pain, or inability to care for self.

A Classic Presentation

A 67-year-old woman with diabetes and a 40-pack-year smoking history reports months of calf pain after walking two blocks that resolves with rest. She now has a small nonhealing ulcer over the first toe and diminished dorsalis pedis pulses bilaterally. ABI is 0.68 on the affected side. There are no signs of acute ischemia. She is started on aspirin and high-intensity statin, counseled on smoking cessation and walking therapy, and referred to vascular surgery for outpatient follow-up.

Patient Presentation to Attending

This is a 67-year-old woman with diabetes, smoking history, and exertional calf pain over months, now with a nonhealing toe ulcer. My main concern is symptomatic peripheral arterial disease with possible chronic limb-threatening ischemia because she has classic claudication, diminished distal pulses, and tissue loss. I don’t see features of acute limb ischemia right now—there’s no sudden onset, no severe rest pain out of proportion, and the foot is warm enough with preserved motor and sensation. Her ABI is reduced on the affected side, which supports PAD. On exam she has weak pedal pulses and an ischemic ulcer but no emergent neurovascular compromise. I’m starting antiplatelet therapy and a statin, optimizing risk factors, and I’d like vascular follow-up; if the wound or pain is worse than it appears, we’d escalate to inpatient vascular evaluation.

Study Directive

Memorize the 6 P’s of acute limb ischemia and rehearse them aloud.
Practice interpreting ABI values and deciding who needs vascular consultation now vs outpatient follow-up.
Build a one-minute counseling script for smoking cessation, statin adherence, and walking therapy.
Draw a flowchart: claudication → ABI → medical therapy vs revascularization.

Key Medications

Aspirin: 325 mg PO load, then 81 mg daily.
Clopidogrel: 75 mg PO daily; loading dose 300–600 mg if indicated for vascular intervention or ACS overlap, depending on context.
Atorvastatin: 40–80 mg PO daily for symptomatic PAD unless contraindicated.
Heparin for acute limb ischemia: IV bolus 80 units/kg then 18 units/kg/hr infusion; verify institutional protocol and bleeding risk.
Cilostazol: 100 mg PO BID for claudication if no heart failure; avoid in CHF.
Analgesia: tailor to pain severity; opioids may be needed in ischemic limb pain.
Pediatric note: PAD is uncommon; consider congenital, vasculitic, or thrombotic etiologies and consult vascular/peds specialists.

High-Yield Pearls

PAD is CAD of the legs: treat the vascular risk, not just the symptom.
ABI < 0.90 is abnormal; <0.40 often suggests severe disease.
Acute limb ischemia is a different emergency and needs immediate anticoagulation and vascular involvement.

Board Question

A 72-year-old man with smoking history has exertional calf pain that resolves with rest. ABI is 0.82. Which is the best next step?

AImmediate thrombolysis
BHigh-intensity statin and smoking cessation counseling
CEmergent fasciotomy
DIV heparin bolus followed by infusion

Reveal answer

Correct: B

High-intensity statin and smoking cessation counseling

This patient has chronic PAD, not acute limb ischemia. Guideline-directed medical therapy includes smoking cessation, statin therapy, blood pressure and diabetes control, exercise therapy, and often antiplatelet therapy; heparin is for acute limb ischemia.

Recent Literature

Review or guideline 2024 ACC/AHA/AACVPR/APMA/ABC/SCAI/SVM/SVN/SVS/SIR/VESS Guideline for the Management of Lower Extremity Peripheral Artery Disease: A Report of the American College of Cardiology/American Heart Association Joint Committee on Clinical Practice Guidelines
Circulation, 2024 · cited 526×

Full text · open access
Recent clinical Expert consensus on Lipoprotein(a) in the Gulf countries: Navigating cardiovascular risk and therapeutic advances
Atheroscler Plus, 2026

Full text · open access

3 of 4

Hypertensive Emergencies: Deep Dive

Severe blood pressure elevation becomes an emergency only when it causes acute target-organ injury. The danger is not the number alone — it’s missing...

At the Bedside

Define it: markedly elevated BP with acute end-organ damage.
Do not treat asymptomatic severe hypertension like an emergency; address pain/anxiety, repeat measurements, arrange follow-up unless there’s target-organ injury.
History/exam clues for organ injury:
Neuro: focal deficits, confusion, seizures, severe headache, vision change.
Cardiac/pulm: chest pain, dyspnea, pulmonary edema, ACS symptoms.
Renal: oliguria, hematuria.
Vascular: aortic pain, pulse deficit.
Pregnancy/postpartum: preeclampsia/eclampsia.
Initial workup: ECG, troponin if indicated, BMP/Cr, urinalysis, CXR, CT head if neuro findings, CTA if dissection concern, pregnancy test when applicable.
Disposition: most require ICU/step-down with titratable IV meds; select uncomplicated cases may be observed and discharged with oral adjustment if no end-organ injury.
BP reduction goals:
Generally lower MAP by no more than ~25% in the first hour.
Then to about 160/100–110 over the next 2–6 hours if stable.
Avoid precipitous drops, especially in chronic HTN, stroke, and aortic stenosis.
Special cases:
Aortic dissection: target HR first, then SBP ~100–120.
Ischemic stroke: permissive hypertension unless thrombolysis/thrombectomy candidate or very high BP.
ICH: often target SBP around 140 with protocol-based titration.
Pulmonary edema: afterload reduction plus diuresis/respiratory support.
Preeclampsia/eclampsia: magnesium plus antihypertensive therapy and obstetrics involvement.

A Classic Presentation

A 49-year-old man presents with BP 228/132, headache, confusion, and right-sided weakness. CT head shows a small intracerebral hemorrhage without mass effect. He is placed on a titratable nicardipine infusion, admitted to the ICU, and his blood pressure is lowered carefully toward protocol targets while neurosurgery is notified. The key is treating target-organ injury while avoiding overly rapid reduction that could worsen cerebral perfusion.

Patient Presentation to Attending

This is a 49-year-old man with chronic hypertension presenting with severe BP elevation, headache, and focal neurologic symptoms. My main concern is a hypertensive emergency with intracranial target-organ injury because he’s confused and has a new unilateral deficit, which is not just asymptomatic hypertension. He also has no clear chest pain or dissection-type pain, but I’m still screening for other end-organ injury with ECG, creatinine, and neuroimaging. On exam he’s hypertensive and has right-sided weakness with altered mentation. CT shows a small ICH, so I’ve started a titratable nicardipine drip and am avoiding a rapid overcorrection. He’s being admitted to the ICU with neurology/neurosurgery input for close BP titration and neuro checks.

Study Directive

Make a one-page hypertensive emergency organ map: brain, heart, lungs, aorta, kidneys, pregnancy.
Drill the first-hour BP goal and the exceptions by disease.
Practice choosing the right IV agent for 5 scenarios: ICH, ACS, pulmonary edema, dissection, preeclampsia.
Write out a “what not to do” list: no reflex oral meds, no rapid overcorrection, no treating the number alone.

Key Medications

Nicardipine: 5 mg/h IV, increase by 2.5 mg/h every 5–15 min, max 15 mg/h.
Clevidipine: 1–2 mg/h IV, titrate rapidly; protocol-dependent max.
Labetalol: 10–20 mg IV over 1–2 min, repeat or infuse 0.5–2 mg/min.
Esmolol: useful when HR control is needed, especially dissection.
Hydralazine: 5–10 mg IV, but less predictable; often avoided except selected pregnancy-related use.
Nitroglycerin: especially helpful for ACS/pulmonary edema; dosing varies by indication, check protocol.
Magnesium sulfate (preeclampsia/eclampsia): 4–6 g IV loading dose, then 1–2 g/hr infusion.
Pediatric note: severe hypertension requires age/weight-specific guidance and often specialty consultation.

High-Yield Pearls

The BP number alone does not define emergency — end-organ injury does.
Lower gradually; too much/too fast can worsen ischemia in brain, heart, and kidneys.
Pick the drug for the organ problem: nicardipine/clevidipine for many cases, beta-blockade for dissection, nitrates for pulmonary edema/ACS.

Board Question

A 61-year-old woman has BP 240/120, headache, and pulmonary edema on chest x-ray. Which IV medication is most appropriate?

ANicardipine infusion
BOral clonidine
CSubcutaneous insulin
DOral hydrochlorothiazide

Reveal answer

Correct: A

Nicardipine infusion

This is a hypertensive emergency with acute target-organ injury. A titratable IV agent such as nicardipine is appropriate because it allows controlled BP reduction; oral agents are too slow and unreliable for emergencies.

4 of 4

Asthma: Deep Dive

Asthma can deteriorate quickly into respiratory failure, and severe attacks are common ED pitfalls because initial wheeze may be misleadingly mild. Prompt...

At the Bedside

Assess severity immediately: ability to speak, accessory muscle use, respiratory rate, wheeze intensity, air movement, mental status, SpO₂, PEF if patient can perform it.
Red flags for impending respiratory failure: silent chest, exhaustion, altered mental status, rising CO₂, bradycardia, hypoxemia despite treatment.
Initial treatment for moderate/severe exacerbation:
SABA via nebulizer or MDI with spacer, often back-to-back initially.
Add ipratropium for moderate/severe attacks.
Systemic corticosteroids early — don’t wait for bronchodilator failure.
Oxygen to maintain adequate saturation.
Monitoring: reassess frequently; consider VBG/ABG if severe, tiring, or not improving. Peak flow can help in cooperative patients but should not delay treatment.
Adjuncts for severe/refractory asthma:
IV magnesium sulfate
Continuous nebulized albuterol
Consider subcutaneous/inhaled epinephrine only if anaphylaxis is a concern or in special circumstances; not routine asthma therapy
Noninvasive ventilation in select cooperative patients
Intubation for impending arrest/fatigue/refractory hypoxemia/hypercapnia
Disposition:
Discharge only if clearly improved, minimal symptoms, good air movement, oxygenation stable, and reliable follow-up.
Admit if persistent symptoms, frequent bronchodilator need, hypoxemia, severe exacerbation, or social barriers.
ICU for impending respiratory failure or intubation.

A Classic Presentation

A 24-year-old woman with childhood asthma presents with shortness of breath, chest tightness, and wheezing after running out of her controller inhaler and developing a viral URI. She is tachypneic, using accessory muscles, and can speak only in short phrases. She improves after stacked albuterol/ipratropium, IV steroids, and magnesium, with better air movement and oxygenation on reassessment. She is discharged only after sustained improvement and receives a controller plan, rescue inhaler refill, and return precautions.

Patient Presentation to Attending

This is a 24-year-old woman with known asthma and a viral trigger presenting with shortness of breath and wheezing over the last day. My main concern is a moderate-to-severe asthma exacerbation with possible impending fatigue because she was speaking in short phrases and had increased work of breathing. She’s less concerning for pneumonia or PE right now because her presentation is diffuse bronchospasm without focal fever, pleuritic pain, or unilateral findings, though I’ll reconsider if she doesn’t respond as expected. On exam she’s tachypneic with accessory muscle use and diffuse expiratory wheezing, and her oxygen saturation is borderline but improving. She’s getting stacked bronchodilators, steroids, and magnesium, and I’m reassessing for air movement and signs of fatigue to decide whether she can safely go home or needs admission.

Study Directive

Rehearse the severity assessment: speech, air movement, RR, accessory muscles, SpO₂, mental status.
Memorize the stacked ED asthma treatment sequence and doses.
Practice deciding discharge vs admit vs ICU using 3 fictional asthma patients.
Draw a one-line distinction between asthma, COPD, anaphylaxis, and pneumonia in dyspneic patients.

Mechanism Pearl of the Day: Across all four topics, the emergency is often not the headline number or symptom itself but the active destructive process behind it: aortic shear, arterial flow loss, pressure-related end-organ injury, or bronchospastic inflammation/fatigue. In each case, the ED priority is to interrupt the mechanism early — not just treat the visible vital sign.

Key Medications

Albuterol: 2.5–5 mg nebulized every 20 min x 3, or continuous neb in severe cases; MDI 4–8 puffs with spacer can be equivalent in some settings.
Ipratropium: 0.5 mg nebulized every 20 min x 3 in severe exacerbation.
Prednisone: 40–60 mg PO daily for 5–7 days.
Methylprednisolone: 60–125 mg IV initially if unable to take PO or severe illness; follow institutional guidance.
Magnesium sulfate: 2 g IV over 15–20 min for severe exacerbation.
Terbutaline: 0.25 mg subcutaneous; repeat once in some protocols if severe bronchospasm. Check institutional dosing.
Epinephrine: if anaphylaxis/airway edema suspected, give 0.3–0.5 mg IM of 1 mg/mL (1:1000) solution.
Pediatric note: albuterol and steroid dosing are weight-based; use pediatric asthma pathways.

High-Yield Pearls

Wheeze can disappear when asthma worsens; a silent chest is ominous.
Steroids early is one of the biggest outcome-changing moves in asthma.
Clinical work of breathing matters more than the wheeze score alone; fatigue and mental status are late danger signs.

Board Question

A 19-year-old man has severe asthma with poor air movement, tachypnea, and accessory muscle use. Which intervention should be started early?

AOral antibiotics
BSystemic corticosteroids
CDiuretics
DThrombolysis

Reveal answer

Correct: B

Systemic corticosteroids

Early systemic corticosteroids reduce airway inflammation and help prevent progression and relapse in moderate to severe asthma exacerbations. They should be given early, along with bronchodilators, rather than waiting to see whether inhaled therapy alone works.

Recent Literature

Review or guideline Direct and indirect challenges in the clinical assessment of asthma
Ann Allergy Asthma Immunol, 2009 · cited 112×
Recent clinical Active 46-year-old man with right-sided visual loss and no family history of stroke · Dx?
J Fam Pract, 2017

TheDaily Differential

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At the Bedside

Study Directive

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Asthma: Deep Dive

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