ECG Reference
ECG Criteria, Formulas, and Algorithms
17 terms — criteria, diagrams, and real ECG strips
Bazett's formulaBazett's formula is a method for correcting the QT interval for heart rate (QTc, corrected QT).
Fridericia's formulaFridericia's formula is a method for correcting the QT interval for heart rate using the cube root of the RR interval.
Framingham formula (QTc)The Framingham QT formula is a linear method for correcting the QT interval for heart rate.
Hodges formulaHodges' formula is a method for correcting the QT interval for heart rate using a linear correction based on heart rate rather than an exponent of RR.
Brugada criteria for VTThe Brugada algorithm for VT is a step-by-step differential diagnosis algorithm for regular wide-complex monomorphic tachycardia in adults,…
Vereckei algorithmThe Vereckei algorithm is a method for differentiating ventricular tachycardia (VT) from supraventricular tachycardia (SVT) with aberrant conduction during regular monomorphic tachycardia with…
VT vs. SVT with aberrationVT vs. SVT with aberration is a differential diagnosis task for wide-complex tachycardia (≥120 ms), determining whether the impulse originates from the ventricles or…
Narrow QRS tachycardiaNarrow QRS tachycardia is a tachyarrhythmia with a heart rate above 100 bpm and a QRS complex duration of less than 120 ms, most commonly of supraventricular origin.
Modified Sgarbossa criteria (Smith)The modified Sgarbossa criteria (Smith criteria) are diagnostic rules for ST-elevation myocardial infarction in patients with left bundle branch block (LBBB) or ventricular…
STEMI criteriaSTEMI criteria are threshold values for ST-segment elevation on the ECG at the J point that indicate probable acute coronary occlusion.
Selvester scoreThe Selvester QRS score is an empirical scoring system used to estimate the size of a prior myocardial infarction based on electrocardiographic changes…
ECG criteria for LVHElectrocardiographic criteria for LVH are a set of voltage and scoring parameters used to suspect left ventricular myocardial mass increase on an ECG.
Tisdale scoreThe Tisdale score is a risk-scoring tool for drug-induced QT interval prolongation in hospitalized patients.
Schwartz scoreThe Schwartz score is a diagnostic scoring system used to assess the probability of congenital long QT syndrome based on ECG findings, patient history, and family history.
Shanghai score for Brugada syndromeThe Shanghai score for Brugada syndrome is a scoring diagnostic system that combines ECG findings, clinical symptoms, family history, and…
Adenosine testThe adenosine test is a pharmacological challenge using intravenous bolus administration of adenosine (or ATP) to diagnose and terminate tachyarrhythmias via temporary AV nodal blockade.
Vagal maneuversVagal maneuvers are techniques that reflexively increase vagal tone and slow conduction through the AV node.
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Basics: waves, intervals, axesSinus nodeSupraventricular arrhythmiasVentricular arrhythmiasAV blocksBundle and fascicular blocksVentricular pre-excitationMyocardial ischemia and infarctionHypertrophy and chamber enlargementElectrolytes and metabolismDrugs and intoxicationsChannelopathies and cardiomyopathiesPericardium, lungs, brain, and othersCardiac pacingArtifacts and lead placement errorsPhenomena and eponymsPediatric, athletes, pregnant patients