Emergencies
Results:
Pediatric ECG Red Flags
Key Points: Any wide QRS (>90 ms) in an infant or small child is abnormal and should trigger evaluation for VT, sodium-channel blockade, or conduction disease. QTc >450 ms in…
Unstable Bradyarrhythmias
Key Points: Unstable bradyarrhythmias cause poor perfusion which can rapidly progress to shock, irreversible organ injury, or cardiac arrest. Priority: Do not treat the heart rate alone. Treat clinical instability….
Severe Hypothermia
Key Points: Severe hypothermia causes predictable ECG slowing and conduction delay. Sinus bradycardia, PR/QRS/QT prolongation, and atrial fibrillation with a slow ventricular response are common as core temperature falls. Osborn…
UMEM Cases, Part 2: When the ECG Conceals and When It Reveals
An 81-year-old woman presents with lightheadedness and marked bradycardia. Her ECG shows more P waves than QRS complexes, but the mechanism is not immediately clear. The key question is whether…
Computer Interpreted “Normal” ECGs
Key Points: Do not trust a computer read of “normal” without your own review. Computer interpretation is especially unreliable for subtle or early ischemia, including hyperacute T waves, minimal ST…
Torsade de Pointes (TdP)
Key Points: Definition: Torsade de pointes is a specific subtype of polymorphic ventricular tachycardia that occurs in the setting of QT prolongation. ECG pattern: TdP shows beat-to-beat variation in QRS…
ST Elevation in aVR with Diffuse ST Segment Depression: OMI Pattern
Key Points: Pattern, not a STEMI equivalent. ST elevation in aVR (≥1 mm), often with ST elevation in V1 and diffuse ST depression (≥1 mm in ≥6 leads), represents high-risk…
Hyperkalemia Emergencies
Key Points: Severe Hyperkalemia Mimics Several Life-Threatening Conditions: Severe hyperkalemia is one of the most dangerous ECG mimics in emergency medicine. It can resemble unstable bradyarrhythmias, VT, STEMI, and pacemaker…
Polymorphic Ventricular Tachycardia (PMVT)
Key Points: Definition: Polymorphic ventricular tachycardia is VT with beat-to-beat variation in QRS morphology, axis, and amplitude. Clinical significance: PMVT is electrically unstable and can rapidly deteriorate into ventricular fibrillation…
UMEM Cases, Part 1: When the ECG Lies and When It Evolves
A 72-year-old man presents with chest pain and shortness of breath. His ECG shows sinus rhythm with LVH, mild inferior ST elevation, and lateral ST-T abnormalities that some interpret as…
Nonsustained Ventricular Tachycardia (NSVT)
Key Points: Definition: Nonsustained ventricular tachycardia is 3 or more consecutive ventricular beats lasting less than 30 seconds and terminating spontaneously. Rate: VT is usually faster than 120 bpm, but…
STEMI vs Wide QRS (BBBs & Paced Rhythms): DDx
Key Points: Wide QRS rhythms distort repolarization. Bundle branch block and ventricular pacing create secondary ST-T changes even without occlusion MI. Appropriate discordance is expected. ST segments and T waves…
South African Flag Sign: OMI Pattern
Key Points: Pattern: The South African Flag sign is the combination of ST elevation in I, aVL, and V2 with reciprocal ST depression in III. It is a subtle but…
Three ECG Traps You Cannot Afford to Miss
A 60-year-old woman presents with palpitations and an irregular wide-complex tachycardia. The computer calls atrial fibrillation with a left bundle branch block, but a subtle clue in the precordial leads…
Occlusion MI in Ventricular Paced Rhythms: STEMI Equivalent Pattern
Key Points: Ventricular paced rhythms can mask acute coronary occlusion. Pacing alters depolarization and produces expected secondary ST-T abnormalities, so standard STEMI criteria are unreliable. Appropriate discordance is expected in…
The Life Savers: Critical ECGs Hub
Key Points: Life Savers are the can’t-miss ECGs. These patterns may reflect immediately life-threatening ischemic, electrical, mechanical, obstructive, toxicologic, or metabolic emergencies. This hub is built for rapid action. Use…
The Syncope ECG With Too Much P
A 68-year-old man has syncope, then has a second syncopal episode while lying still on a stretcher during evaluation at an outpatient clinic. He is sent emergently to the ED….
Electrical Alternans
Key Points: Electrical alternans is a beat-to-beat alternation in QRS amplitude, axis, or both. It is classically associated with a large pericardial effusion and may support concern for tamponade, but…
Pericardial Effusion
Key Points: Pericardial effusion is the accumulation of fluid in the pericardial sac. ECG may provide clues, but it is not sensitive enough to exclude effusion. Important ECG clues include…
STEMI vs LVH: DDx
Key Points: Left ventricular hypertrophy (LVH) with strain is one of the most common and dangerous STEMI mimics, particularly in the anterior leads, and is a frequent cause of false-positive…
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