<prompt> In an ECG the cardiac event corresponding to the ST segment is:Atrial depolarisationVentricular depolarisationAtrial repolarisationVentricular repolarisation  <response>: PR - Interval corresponds with atrial depolarisation and conduction through AV node QRS - corresponds with Ventricular depolarisation atrial repolarisation QT - corresponds with ventricular depolarisation ventricular repolarisation Ref: Guyton 12th Ed 