Core

ECG STAT July 12, 2025

Fusion Beats

Key Points Definition: A fusion beat occurs when two impulses — one from the normal conduction system (typically supraventricular) and one from an ectopic ventricular focus (e.g., during VT) —…

ECG STAT July 11, 2025

Key Points The ECG is a cornerstone of acute care medicine, offering immediate, non-invasive insight into cardiac function in critically ill patients. Its evolution spans over a century, from rudimentary…

ECG STAT July 1, 2025

Pseudonormalization of T Waves

Key Points Definition: Pseudonormalization is the apparent normalization of previously inverted T waves, often signaling reocclusion of a coronary artery that had recently reperfused. Mechanism: During reperfusion, ischemic T wave…

ECG STAT June 12, 2025

Sinus Tachycardia

Key Points Definition: Sinus tachycardia is a regular rhythm originating from the sinoatrial (SA) node, defined by a heart rate >100 bpm in adults or above age-adjusted norms in children….

ECG STAT June 6, 2025

Hyperkalemic Periodic Paralysis (Impressive Syndrome)

Key Points What It Is: A rare autosomal dominant sodium channelopathy that leads to episodic muscle weakness or paralysis in the setting of elevated serum potassium. Named after “Impressive,” the…

ECG STAT May 14, 2025

Trifascicular Block

Key Points Definition: Trifascicular block describes ECG evidence of impaired conduction across all three fascicles: right bundle branch (RBB), left anterior fascicle (LAF), and left posterior fascicle (LPF). Common Usage:…

ECG STAT May 12, 2025

Sinus Bradycardia

Key Points: Definition: Sinus bradycardia is a rhythm originating from the sinoatrial (SA) node with a rate < 60 bpm. Physiological Occurrence: Common in young, healthy adults, athletes, and during…

ECG STAT April 25, 2025

Slow Atrial Fibrillation

Key Points Definition: Atrial fibrillation with a slow ventricular response, usually < 60 bpm. ECG: Irregularly irregular rhythm, no discrete P waves, slow R-R intervals. Common causes: AV-nodal blockers (digoxin,…

ECG STAT April 20, 2025

Precordial Swirl: OMI Pattern

Key Points Definition: The precordial swirl sign refers to a rotational pattern of ST-segment abnormalities across the precordial leads, suggesting a dynamic and evolving occlusion myocardial infarction (OMI). It is…

ECG STAT April 14, 2025

Unifasicular Block

Key Points Definition: Unifascicular block refers to conduction delay or interruption in a single fascicle of the ventricular conduction system: the right bundle branch (RBB), left anterior fascicle (LAF), or…

ECG STAT April 11, 2025

QRS Voltage: Basics

Key Points: Definition: QRS voltage represents the amplitude (height) of the QRS complex on ECG, reflecting ventricular electrical activity during depolarization. High Voltage: Increased QRS voltage typically indicates ventricular hypertrophy—most…

ECG STAT March 28, 2025

Sodium Channel Blocker Toxicity

Key Points: Recognizing the Danger: Sodium channel blocker toxicity can present with a variety of ECG changes that are critical to recognize, especially in patients with altered mental status or…

ECG STAT February 28, 2025

EMS ECGs in Acute Coronary Syndromes (ACS)

Key Points for EMS Providers: You are the first critical link in the chain of survival for ACS patients—your actions set the course for their care, directly impacting time to…

ECG STAT January 17, 2025

Subtle ST Segment Elevation: OMI Pattern

Key Points: ACS Dynamics: Occluded arteries in ACS can spontaneously reperfuse and reocclude, making ECG findings variable. Limitations of Computer Interpretation: Subtle STE is often missed by computerized ECG interpretation;…

ECG STAT January 11, 2025

Brugada Syndrome (BrS)

Key Points: Life-Threatening Sodium Channelopathy: Predisposes to ventricular arrhythmias (VF/VT) and sudden cardiac death (SCD), often in otherwise “healthy” hearts. When to Suspect BrS: Patients with syncope, unexplained “seizures,” ventricular…

ECG STAT January 6, 2025

Hypokalemic Periodic Paralysis

Key Points Definition: A rare ion channelopathy that causes sudden, reversible episodes of symmetric flaccid paralysis triggered by low serum potassium. It may be inherited or secondary to thyrotoxicosis or…

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