scholarly journals Left Ventricular Systolic Time Intervals as Indices of Postural Circulatory Stress in Man

Circulation ◽  
1970 ◽  
Vol 41 (3) ◽  
pp. 485-492 ◽  
Author(s):  
R. W. STAFFORD ◽  
W. S. HARRIS ◽  
A. M. WEISSLER
Keyword(s):  
Systolic Time Intervals ◽  
Left Ventricular ◽  
Time Intervals ◽  
Systolic Time ◽  
Circulatory Stress

Value of Systolic Time Intervals in the Diagnosis of Large Patent Ductus Arteriosus in Fluid-Restricted and Mechanically Ventilated Preterm Infants

PEDIATRICS ◽  
1984 ◽  
Vol 74 (6) ◽  
pp. 1069-1074
Author(s):  
François Heitz ◽  
Jean-Claude Fouron ◽  
Nicolaas H. van Doesburg ◽  
Harry Bard ◽  
François Teasdale ◽  
...  
Keyword(s):  
Patent Ductus Arteriosus ◽  
Right Ventricular ◽  
Ductus Arteriosus ◽  
Systolic Time Intervals ◽  
Left Ventricular ◽  
Ejection Time ◽  
Time Intervals ◽  
Systolic Time ◽  
Ventricular Ejection Time ◽  
Patent Ductus

M-mode echocardiographic features suggesting a patent ductus arteriosus are based on two groups of indirect criteria: dilation of the left cardiac cavities and changes of systolic time intervals. The reliability of the first group of criteria has been questioned in fluidlimited, mechanically ventilated preterm infants. The sensitivity of the systolic time intervals in the same circumstances is investigated. Twenty-three patients with a large patent ductus arteriosus were selected. Review of their echocardiograms shows that the sensitivity of the various criteria (expressed as percentage of positivity) was as follows: inversion of the ratio of left ventricular preejection period to right ventricular preejection period, 91.3%; left ventricular preejection period to left ventricular ejection time over right ventricular preejection period to right ventricular ejection time < 1, 83%; left atrium dilation, 74%; shortening of left ventricular preejection period, 70%; dilation of left ventricular internal dimensions in diastole, 65%; increase in left atrium/aorta, 52%; and decrease of left ventricular preejection period to left ventricular ejection time, 48%. Three criteria involving time intervals (left ventricular preejection period to right ventricular preejection period, left ventricular preejection period, and left ventricular preejection period to left ventricular ejection time) had 100% specificity. The lowest specificity was found with criteria involving the left atrium (left atrial to aortic root ratio 75% and left atrium 63%). It is concluded that study of systolic time intervals is a reliable means of detecting preterm infants with hemodynamically significant left-to-right shunt through a patent ductus arteriosus even if the infants are mechanically ventilated and fluid restricted.

scholarly journals CORRELATION OF QK TIME INTERVALS WITE LEFT VENTRICULAR SYSTOLIC TIME INTERVALS AND CARDIAC OUTPUT IN ISCHEMIC HEART DISEASES

1976 ◽  
Vol 26 (6) ◽  
pp. 453-458
Author(s):  
YOSHIYUKI YOSHITAKE ◽  
OSAMU YAMANE ◽  
HIDEAKI SUGA ◽  
NOBORU BABA ◽  
KAZUHIKO MURATA
Keyword(s):  
Cardiac Output ◽  
Heart Diseases ◽  
Systolic Time Intervals ◽  
Left Ventricular ◽  
Ischemic Heart ◽  
Time Intervals ◽  
Ischemic Heart Diseases ◽  
Systolic Time
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