PR

Tom in London Nov 20, 2016:

RS Presumably RS will be the next question :)

Joseph Tein Nov 20, 2016:

Same for QT (no need to post a question). And you understand RS?

Joseph Tein Nov 20, 2016:

PR = PR L'intervallo PR, detto anche intervallo PQ viene misurato dall'inizio dell'onda P all'inizio del complesso QRS.

In electrocardiography, the PR interval is the period, measured in milliseconds, that extends from the beginning of the P wave (the onset of atrial depolarization) until the beginning of the QRS complex (the onset of ventricular depolarization); it is normally between 120 and 200ms in duration.

https://en.wikipedia.org/wiki/PR_interval