PT  - JOURNAL ARTICLE
AU  - D G Gibson
AU  - E Fleck
AU  - W Rudolph
TI  - Effect of postextrasystolic potentiation on amplitude and timing of regional left ventricular wall motion in ischaemic heart disease.
AID  - 10.1136/hrt.49.5.466
DP  - 1983 May 01
TA  - British Heart Journal
PG  - 466--476
VI  - 49
IP  - 5
4099  - http://heart.bmj.com/content/49/5/466.short
4100  - http://heart.bmj.com/content/49/5/466.full
SO  - Heart1983 May 01; 49
AB  - In order to investigate the effects of postextrasystolic potentiation on left ventricular wall motion, the left ventriculograms of 30 patients were digitised frame by frame and regional movement demonstrated by contour displays. Postextrasystolic potentiation caused significant increases in end-diastolic volume, ejection fraction, and peak ejection and filling rates. The amplitude of normally moving segments increased by 5.7 +/- 2.3 mm, regardless of initial amplitude. Hypokinetic segments moved normally if the initial amplitude was greater than 5 mm, and there was a reduced or absent response if 4 mm or less. Four specific abnormalities of timing of motion were studied during isovolumic contraction, early ejection, and isovolumic relaxation. Their timing and extent were all unaffected in postextrasystolic beats. These results thus give no evidence for the entity "reversible asynergy". Rather, they suggest that the response of local wall motion to postextrasystolic potentiation depends only on basal amplitude and increased volume change in postextrasystolic beats.