The normal PR interval is 0.12 to 0.20 seconds, or 120 to 200 milliseconds. Note that the PR interval can be altered by changing sympathetic and parasympathetic tone. Because of this, medications ...

A normal ECG contains waves ... The intervals commonly measured on an ECG include the PR interval, QRS interval (also called QRS duration), QT interval and RR interval. Segment: The length ...

The goal of ECG interpretation in athletes is to classify the ECG as: (1) ‘normal’—no further evaluation needed or (2) ‘abnormal’—further evaluation needed. Normal ECGs include common, ...

Upon review of this body and the described ECG findings, certain common patterns ... cocaine use and AV conduction as assessed by PR interval length appears to be somewhat contradictory.