Peripheral Circulatory Features during High-Frequency Jet Ventilation

Abstract

The paper gives the results of a study of peripheral circulatory features during high-frequency jet ventilation (HFJV). The main specific features of peripheral circulation and oxygen transport during HFJV are formulated on the basis of a study of cardiac output (impedance cardiography), peripheral vascular resistance, peripheral vascular blood filling (photoplethysmogram analysis), adaptive peripheral blood flow reactions (spectral analysis of peripheral vascular pulsation). HFJV gives rise to the peculiar pattern of peripheral hemodynamics and tissue gas exchange, which is characterized by higher oxygen uptake without a decrease in mixed venous blood saturation, with normal extraction coefficient and preserved low peripheral vascular resistance. During HFJV, unlike traditional ventilation, the main peripheral hemodynamic feature is the increased capillary bed blood volume caused by the blood flow involvement of reserve capillaries under control of volume (parasympathetic) regulation of adaptive peripheral hemodynamic reactions. Key words: high-frequency jet ventilation, oxygen transport, peripheral hemodynamics.