Effect of 60 degrees head-up tilt on systolic time intervals in hypertensive patients.
Indian J Physiol Pharmacol
;
2002 Jan; 46(1): 45-50
Article
in English
| IMSEAR
| ID: sea-106700
ABSTRACT
Time course of systolic time interval (STI) variations during 60 degrees head-up tilt (HUT) was studied in 21 patients with essential hypertension and equal number of age-matched control subjects. ECG, Phonocardiogram and carotid pulse were recorded simultaneously on polygraph. Electromechanical systole (QS2), left ventricular ejection time (LVET), pre ejection period (PEP), PEP/LVET ratio and ejection fraction (EF) were determined immediately after and at 1, 2, 3, 4 and 5 min after the tilt. In hypertensive patients, basal values of PEP and PEP/LVET ratio were insignificantly higher whereas LVET and EF were insignificantly lower as compared to the control subjects. 60 degrees HUT produced significant decrease in LVET (P < 0.001) and EF (P < 0.001) and a significant increase in PEP/LVET ratio (P < 0.001) in control subjects. The changes in hypertensive subjects were similar in pattern but statistically insignificant. It is concluded that tilt-induced changes in STIs are blunted in hypertensive patients.
Full text:
Available
Index:
IMSEAR (South-East Asia)
Main subject:
Posture
/
Stroke Volume
/
Systole
/
Humans
/
Male
/
Supine Position
/
Hypertension
/
Middle Aged
Language:
English
Journal:
Indian J Physiol Pharmacol
Year:
2002
Type:
Article
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