Lower heart rates also result in a longer QT interval. A quick way to distinguish a prolonged QT interval is to examine if the T wave ends beyond the halfway point between the RR interval.

Department of Molecular Pharmacology & Experimental Therapeutics, Mayo Clinic, Rochester, Minnesota, USA Correspondence to Dr M J Ackerman, Long QT Syndrome Clinic and the Mayo Clinic Windland Smith ...

Prolonged QTc interval, pericardial effusion and diastolic dysfunction are associated with higher mortality.

The QT interval is the time from the beginning of the QRS complex (ventricular depolarization) to the end of the T wave (ventricular ... the corrected QT interval (QTc) is frequently used.