Resumen

Effect of ventilation on systemic blood flow evaluated by echodopplercardiography. Braz J Med Biol Res [online]. 1997, vol.30, n.5, pp. 689-691. ISSN 1414-431X.  http://dx.doi.org/10.1590/S0100-879X1997000500019.

Systemic blood flow (Q) was measured by echodopplercardiography in 5 normal young adult males during apnea, eupnea and tachypnea. Measurements were made in a recumbent posture at 3-min intervals. Tachypnea was attained by doubling the respiratory frequency at eupnea at a constant tidal volume. An open glottis was maintained during apnea at the resting respiratory level. The Q values were positively correlated with the respiratory frequency, decreasing from eupnea to apnea and increasing from eupnea to tachypnea (P<0.05). These data demonstrate that echodopplercardiography, a better qualified tool for this purpose, confirms the positive and progressive effects of ventilation on systemic blood flow, as suggested by previous studies based on diverse technical approaches

Palabras llave : ventilation and circulation; apnea and systemic blood flow; tachypnea and systemic blood flow; cardiac output.