Journal of Applied Physiology
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J Appl Physiol 65: 1967-1974, 1988;
8750-7587/88 $5.00
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Journal of Applied Physiology, Vol 65, Issue 5 1967-1974, Copyright © 1988 by American Physiological Society

ARTICLES

Involvement of ANF in the acute antidiuresis during PEEP ventilation

P. Andrivet, S. Adnot, C. Brun-Buisson, P. E. Chabrier, J. Y. Darmon, P. Braquet and F. Lemaire
Departement de Reanimation Medicale, Institut National de la Sante et de la Recherche Medicale, Hopital Henri Mondor, Creteil, France.

To investigate the potential role of natriuretic factor (ANF) on changes on renal excretory function in response to increased intrathoracic pressure, seven patients were studied during three successive 60-min periods of 1) mechanical ventilation (MV) and zero end-expiratory pressure (ZEEP), 2) MV with 12 cmH2O positive end-expiratory pressure (PEEP), and 3) MV with the same level of PEEP while lower-body positive pressure (LBPP) was applied to restore venous return and increase central blood volume without fluid loading. Hemodynamics, renal excretory function parameters, and plasma immunoreactive atrial natriuretic factor (irANF) levels were recorded at the end of each period. Compared with ZEEP, PEEP induced a significant reduction of diuresis (from 134 +/- 17 to 59 +/- 13 ml/h, P less than 0.01) and natriuresis (from 8.37 +/- 3.5 to 3.83 +/- 2 mmol/h, P less than 0.01), whereas plasma irANF fell from 520 +/- 292 to 155 +/- 40 pg/ml (P less than 0.01) and transmural right atrial pressure decreased from 3.9 +/- 0.5 to 2.4 +/- 0.3 mmHg (P less than 0.01). Opposite changes were observed during application of LBPP, which restored diuresis and plasma irANF to near control ZEEP values, despite continuation of PEEP. Changes in renal excretory function parameters thus paralleled changes in right atrial pressure and plasma irANF. We suggest that changes in plasma irANF in response to hemodynamic variations induced by changes in intrathoracic pressure may contribute to alterations of renal excretory function during PEEP.


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