Effects of positive end-expiratory pressure on right ventricular function in COPD patients during acute ventilatory failure View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

1996-09

AUTHORS

M. Dambrosio, G. Cinnella, N. Brienza, V. M. Ranieri, R. Giuliani, F. Bruno, T. Fiore, A. Brienza

ABSTRACT

ObjectiveTo examine the effects of external positive end-expiratory pressure (PEEP) on right ventricular function in chronic obstructive pulmonary disease (COPD) patients with intrinsic PEEP (PEEPi).DesignProspective study.SettingGeneral intensive care unit in a university teaching hospital.PatientsSeven mechanically ventilated flow-limited COPD patients (PEEPi=9.7±1.3 cmH2O, mean±SD) with acute respiratory failure.InterventionHemodynamic and respiratory mechanic data were collected at four different levels of PEEP (0-5-10-15 cmH2O).Measurements and resultsHemodynamic parameters were obtained by a Swan-Ganz catheter with a fast response thermistor. Cardiac index (CI) and end-expiratory lung volume (EELV) reductions started simultaneously when the applied PEEP was approximately 90% of PEEPi measured on 0 cmH2O (ZEEP). Changes in transmural intrathoracic pressure (PEEPi,cw) started only at a PEEP value much higher (120%) than PEEPi. The reduction in CI was related to a decrease in the right enddiastolic ventricular volume index (RVEDVI) (r=0.61;p<0.001). No correlation between CI and transmural right atrial pressure was observed. The RVEDVI was inversely correlated with PEEP-induced changes in EELV (r=−55;p<0.001), but no with PEEPi,cw (r=−0.08; NS). The relationship between RVEDVI and right ventricular stroke work index, considered an index of contractility, was significant in three patients, i.e., PEEP did not change contractility. In the other patients, an increase in contractility seemed to occur.ConclusionsIn COPD patients an external PEEP exceeding 90% of PEEPi causes lung hyperinflation and reduces the CI due to a preload effect. The reduction in RVEDVI seems related to changes in EELV, rather than to changes in transmural pressures, suggesting a lung/heart volume interaction in the cardiac fossa. Thus, in COPD patients, application of an external PEEP level lower than PEEPi may affect right ventricular function. More... »

PAGES

923-932

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02044117

DOI

http://dx.doi.org/10.1007/bf02044117

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1052945866

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/8905427


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