Effect of head-up tilting on systolic time intervals in normal young volunteers.
Indian J Physiol Pharmacol
;
1991 Oct; 35(4): 255-9
Artículo
en Inglés
| IMSEAR
| ID: sea-107695
ABSTRACT
Systolic time intervals (STI) are sensitive indices of myocardial function. Passive tilting is a rapidly reversible and non-invasive method for inducing cardiovascular stress. The present work was conducted to study the effect of graded head-up tilt (HUT) on STI. 20 male medical students were subjected to 30 degrees, 60 degrees and 80 degrees HUT on a tilting table. ECG, phonocardiogram and carotid pulse were recorded simultaneously on Grass polygraph. Electromechanical systole (QS2), left ventricular ejection time (LVET), pre-ejection period (PEP), PEP/LEVT ratio, heart rate (HR) and corrected STI were determined immediately after and at 1, 2, 3, 4 and 5 min after each angle tilt. HUT produced a decrease in QS2 which was more pronounced at higher angle tilt. LVET decreased after 60 degrees and 80 degrees HUT. PEP and PEP/LVET ratio decreased after each angle tilt. These changes in STI can be explained on the basis of sympathetic stimulation-induced increase in the inotropic state of the heart.
Texto completo:
Disponible
Índice:
IMSEAR (Asia Sudoriental)
Asunto principal:
Postura
/
Valores de Referencia
/
Sístole
/
Humanos
/
Masculino
/
Adolescente
/
Adulto
/
Hemodinámica
Idioma:
Inglés
Revista:
Indian J Physiol Pharmacol
Año:
1991
Tipo del documento:
Artículo
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