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The Cabrera format of the 12-lead ECG and inverted lead aVR

…leads in the frontal plane. This format of displaying the ECG leads is referred to as the Cabrera format and it has been the existing…

Mechanisms of cardiac arrhythmias: from automaticity to re-entry (reentry)

…Society of Cardiology (ESC), the American Heart Association (AHA), and the American College of Cardiology (ACC). Definition of heart rhythm A rhythm is defined as…

Fourth Universal Definition of Myocardial Infarction: Types 1–5

…evidence of acute myocardial ischaemia. The Fourth Universal Definition classifies MI into five distinct subtypes based on pathophysiology and clinical context: Type 1 MI: Caused…

Nonspecific intraventricular conduction delay (defect)

…the American Heart Association/American College of Cardiology and the Heart Rhythm Society (AHA/ACCF/HRS) recommendations, a nonspecific intraventricular conduction delay is defined as…

Coronary Artery Disease

…thereby diagnosed as ST elevation myocardial infarction (STEMI) . Chronic Coronary Syndromes (CCS) Coronary artery disease is a progressive but dynamic disease. The majority of individuals…

Stable Coronary Artery Disease (Angina Pectoris): Diagnosis, Evaluation, Management

…thereby diagnosed as ST elevation myocardial infarction (STEMI) . Chronic Coronary Syndromes (CCS) Coronary artery disease is a progressive but dynamic disease. The majority of individuals…

NSTEMI (Non-ST Elevation Myocardial Infarction) & Unstable Angina: Diagnosis, Criteria, ECG, Management

…results in the complete stop of blood flow and thus more extensive myocardial ischemia (referred to as transmural ischemia). Yet, the pain caused by NSTEMI…

Heart Failure with Preserved Ejection Fraction (HFpEF)

…as having HFrEF, as their underlying pathophysiology, trajectory, and risk of relapse upon GDMT withdrawal are fundamentally distinct from true, incident HFpEF [3] . Hemodynamically, the…

Non-ST Elevation Acute Myocardial Infarction (NSTEMI) and Unstable Angina

…However, the 2023 European Society of Cardiology (ESC) and 2025 American College of Cardiology/American Heart Association (ACC/AHA) guidelines emphasize a unified, risk stratified…

STEMI (ST Elevation Myocardial Infarction): Diagnosis, ECG, Criteria, and Management

…indicating that slightly over half of the cases identified as STEMI by EMS are true positives. Negative Predictive Value (NPV) : The NPV is exceptionally high…

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