Aortic input impedance during hypovolemic shock and after hyperosmotic solution infusion
Braz. j. med. biol. res
; 22(2): 253-7, 1989. ilus, tab
Article
em En
| LILACS
| ID: lil-105583
Biblioteca responsável:
BR26.1
ABSTRACT
Aortic input impedance (Zin) was determined in 7 chloralose-urethane-anesthetized dogs. Flow and pressure were recorded in the ascending aorta during randon cardiac pacing. These signals were processed on a spectrum analyzer utilization the Fast tansform. Measurements were made 1) under control conditions; 2) every 5 min throughout 1 h of hypovolemic shock; 3) every 5 min for 5 min for 30 min after ending infusions of hypersosmotic solution (7.5%) NaCl, 4.5 ml/Kg body weight). We conclude that the determination of characteristics impedance (Zc) (average value of Zin from 4 to 10 Hz) can be useful for determining the initial phase of vascular decompensation in hypovolemic shock. After hyperosmotic solution infusion we observed a reduction in peripheral resistance, Zin, Zc, frequency of minimal Zin and frequency of phase crossover. These datea strongly suggest a decrease in arterial vascular tonus
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Coleções:
01-internacional
Base de dados:
LILACS
Assunto principal:
Aorta
/
Solução Salina Hipertônica
Limite:
Animals
Idioma:
En
Revista:
Braz. j. med. biol. res
Assunto da revista:
BIOLOGIA
/
MEDICINA
Ano de publicação:
1989
Tipo de documento:
Article
/
Congress and conference
País de publicação:
Brasil