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the duration of the QRST complex (that is, from the earliest Q wave to the end of the latest T wave on the ECG).
e·lec·tri·cal sys·to·le(ĕ-lek'tri-kăl sis'tŏ-lē)
The duration of the QRS-T complex (i.e., from the earliest Q wave to the end of the latest T wave on the ECG).
The total duration of the QRST complex in an electrocardiogram; it occurs just before the mechanical systole.
See also: systole