First Degree Heart BlockDefined as PR interval > 200ms, commonly caused by AV nodal blocking drugsJohn Larkin and Robert ButtnerNovember 7, 2020
ECG Conduction BlocksAssessment, interpretation of ECG Conduction Blocks including first-degree, second-degree, third-degree, fascicular blocks - ECG LibraryEd Burns and Robert ButtnerAugust 1, 2020
PR IntervalAssessment / interpretation of the EKG PR interval. ECG PR interval is the time from the onset of the P wave to the start of the QRS complex.Mike CadoganAugust 1, 2020
HypothyroidismECG features of hypothyroidism (myxoedema) main triad: Bradycardia; Low QRS voltage; Widespread T-wave inversionEd Burns and Robert ButtnerAugust 1, 2018