The additive pulmonary vasodilatory effects of inhaled prostacyclin and inhaled milrinone in postcardiac surgical patients with pulmonary hypertension.

Abstract:

UNLABELLED:Selective pulmonary vasodilation is an advantageous therapeutic strategy for cardiac surgical patients with increased pulmonary vascular resistance (PVR) and right ventricular failure. We hypothesized that milrinone, an adenosine-3',5'-cyclic monophosphate (cAMP)-selective phosphodiesterase enzyme (PDE) inhibitor may, when nebulized and inhaled, cause selective pulmonary vasodilation and potentiate the vasodilation by inhaled prostacyclin (iPGI(2)). Consequently, we investigated the hemodynamic effects of inhaled milrinone or the combination iPGI(2) + inhaled milrinone in cardiac surgical patients with postoperative mean pulmonary arterial pressure (MPAP) >25 mm Hg and PVR >200 dynes. s(-1). cm(-5). During mechanical ventilation and using a conventional nebulizing system, 9 patients inhaled incremental concentrations of milrinone (0.25, 0.5 and 1 mg/mL) in subsequent 10-min periods (Study Part 1). In the same manner, 11 patients received iPGI(2) (10 microg/mL) followed by the combination of iPGI(2) (10 microg/mL) and inhaled milrinone (1 mg/mL) (Study Part 2). Inhaled milrinone reduced PVR with a maximal effect (-20%, P < 0.001) at the largest concentration. As compared with iPGI(2) alone, iPGI(2) + inhaled milrinone caused a further and prolonged reduction of PVR (-8%, P < 0.05) and increased stroke volume (+5%, P < 0.05). Systemic vascular resistance or mean arterial pressure was not affected by inhalation of either drug(s). The authors conclude that inhalation of the cAMP-selective PDE-inhibitor milrinone selectively dilates the pulmonary vasculature without systemic effects in cardiac surgical patients with pulmonary hypertension. Furthermore, inhaled milrinone appears to potentiate and prolong the pulmonary selective vasodilatory effect of iPGI(2). Inhaled milrinone alone or combined with iPGI(2) may be an important therapeutic option in the treatment of patients with pulmonary hypertension and right ventricular failure. IMPLICATIONS:Pulmonary hypertension may cause or aggravate right heart failure. IV vasodilators reduce systemic blood pressure and might thereby further impair coronary perfusion and right heart performance. In the present study of cardiac surgical patients with pulmonary hypertension, selective pulmonary vasodilation without systemic effects was induced by nebulized, inhaled vasodilators.

journal_name

Anesth Analg

journal_title

Anesthesia and analgesia

authors

Haraldsson s A,Kieler-Jensen N,Ricksten SE

doi

10.1097/00000539-200112000-00018

subject

Has Abstract

pub_date

2001-12-01 00:00:00

pages

1439-45, table of contents

issue

6

eissn

0003-2999

issn

1526-7598

journal_volume

93

pub_type

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