Effect of ventilation on systemic blood flow evaluated by echodopplercardiography.
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.
Rigatto
M
M
Departamento de Medicina Interna, Hospital de Clínicas, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brasil.
Pinotti
A F
AF
D000328:Adult; D001049:Apnea / Q000503:physiopathology*; D001783:Blood Flow Velocity / Q000502:physiology*; D002302:Cardiac Output / Q000502:physiology*; D015150:Echocardiography, Doppler; D006801:Humans; D008297:Male; D012123:Pulmonary Ventilation / Q000502:physiology*