Defined as PR interval > 200ms, commonly caused by AV nodal blocking drugs
Assessment, interpretation of ECG Conduction Blocks including first-degree, second-degree, third-degree, fascicular blocks - ECG Library
Assessment / 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.
ECG features of hypothyroidism (myxoedema) main triad: Bradycardia; Low QRS voltage; Widespread T-wave inversion