�ber die Beziehung der ?Mechanischen Systole? (Q-2. Herzton) und der ?Elektrischen Systole? (Q?T) zur Herzfrequenz

Kuhns, K

doi:10.1007/bf01471948

Cited by 10 publications

(1 citation statement)

References 2 publications

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“…The QS2 interval, or electromechanical systole, has been the subject of many studies [5,20,22,23,29,32,47,49], The present investigation shows that QS2 reflects, in general, changes in LVET. Changes in LVET, however, can be partially or totally compensated by opposite changes in QS, and ICT.…”

Section: Qs-intervalmentioning

confidence: 68%

Systolic Time Intervals at Rest and during Exercise

Cardús¹,

Vera²

1974

Cardiology

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Measurements of the electromechanical systole (QS₂) and its components: electromechanical delay (QS₁), isovolumic contraction time (ICT), and left ventricular ejection time (LVET), were conducted on 30 healthy men at rest and during exercise of varying intensity. The measurements were performed through simultaneous, non-invasive recordings of the electrocardiogram, phonocardiogram, and carotidogram. The conclusions are: (1) QS₂ and its components are principally correlated to the duration of the cardiac cycle (RR); (2) in changing posture from supine to sitting, the mean QS_t and mean ICT tend to increase, but these changes are not statistically significant. LVET and QS₂ are both significantly shortened; (3) during exercise there is a decrease in the mean values of QS_1’ ICT, LVET, and QS₂. The degree of LVET shortening is not as great as predicted by the ‘resting’ regression equation; (4) variations in arterial blood pressure and work load do not significantly affect systolic time intervals; (5) the effect of age on systolic time intervals is difficult to assess and needs further investigation.

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Section: Qs-intervalmentioning

confidence: 68%