Beat frequencies in high‐frequency positive‐pressure ventilation
作者:
ALFRED,
PINCHAK JOAN,
HAGEN DONALD,
HANCOCK CEDOMIR,
期刊:
Critical Care Medicine
(OVID Available online 1984)
卷期:
Volume 12,
issue 9
页码: 729-733
ISSN:0090-3493
年代: 1984
出版商: OVID
数据来源: OVID
摘要:
Amplitude modulation of the waveforms of several cardiovascular variables was investigated during high-frequency (1.3 to 3.3 Hz) positive-pressure ventilation (HFPPV). The amplitude modulation of the pulmonary artery pressure wave was most prominent and its beat frequency (BF) was equal to the difference between the heart rate and the ventilation rate. Spectral analysis of the pulmonary artery pressure demonstrated well-defined peaks associated with the BF. No significant physiologic changes in either cardiovascular or pulmonary function were attributable to the presence of the beat phenomenon.
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