Contrasts between intrathoracic pressures during external chest compression and cardiac massage
作者:
NISHA CHANDRA,
ALAN GUERCI,
MYRON WEISFELDT,
JOSHUA TSITLIK,
NORMAN LEPOR,
期刊:
Critical Care Medicine
(OVID Available online 1981)
卷期:
Volume 9,
issue 11
页码: 789-792
ISSN:0090-3493
年代: 1981
出版商: OVID
数据来源: OVID
摘要:
Pressures were measured in the right atrium, thoracic aorta, and pleural space during conventional cardiopulmonary resuscitation (CPR) and simultaneous ventilation compression cardiopulmonary resuscitation (SVC-CPR) in dogs, pigs, and a baboon. During both forms of closed chest resuscitation, the changes in atrial and aortic pressures were virtually identical over a range of 0–90 mm Hg and essentially equaled the change in pleural pressure measured at the most lateral portion of the chest cavity. During internal cardiac massage, there was no consistent relationship between right atrial and aortic pressures. However, even after the chest had been opened, the hemodynamics of external chest compression could be restored by the creation of a closed, air filled cavity surrounding the heart and great vessels. Thus, elevation of intrathoracic pressure, not direct cardiac compression, is essential to and determines circulation of blood during CPR.
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