Circulation
-
Comparative Study
Comparative effects of volume loading, dobutamine, and nitroprusside in patients with predominant right ventricular infarction.
To assess the value of volume loading and to determine the relative efficacy of dobutamine compared with nitroprusside therapy in acute right ventricular infarction (RVMI), 13 patients with clinical, hemodynamic, and radionuclide angiographic evidence of RVMI were evaluated. In 10 patients who had an initial pulmonary arterial wedge pressure less than 18 mm Hg, volume loading did not improve cardiac index (1.9 +/- 0.5 [SD] to 2.1 +/- 0.4 liters/min/m2), despite significant increases in mean right atrial pressure (11 +/- 2 to 15 +/- 2 mm Hg, p less than .001) and pulmonary arterial wedge pressure (10 +/- 4 to 15 +/- 2 mm Hg, p less than .001). ⋯ Compared with nitroprusside, dobutamine produced a statistically significant increase in cardiac index (2.0 +/- 0.4 to 2.7 +/- 0.5 vs 2.1 +/- 0.4 to 2.3 +/- 0.5 liters/min/m2, p less than .001), stroke volume index (29 +/- 6 to 36 +/- 8 vs 29 +/- 6 to 30 +/- 6 ml/m2, p = .02), and right ventricular ejection fraction (30 +/- 8% to 42 +/- 7% vs 34 +/- 8% to 37 +/- 4%, p less than .01) by two-way analysis of variance. We conclude that volume loading does not improve cardiac index in patients with acute RVMI despite a rise in cardiac filling pressures and that infusion of dobutamine, after appropriate volume loading, produces a significant improvement in cardiac index and right ventricular ejection fraction over those after infusion of nitroprusside.
-
The effects of treatment of oleic acid pulmonary edema with dobutamine, furosemide, and hydralazine on cardiopulmonary function in 24 dogs were investigated. Pulmonary capillary wedge pressure (PCWP) was adjusted to approximately 7 mm Hg; 45 min after oleic acid (0.08 ml/kg), dogs were randomly divided into a control group, in which PCWP was maintained at approximately 7 mm Hg, and into treatment groups as described above. Mean time-averaged PCWP was 2.3 mm Hg in dogs treated with dobutamine, 4.1 mm Hg with furosemide, and 4.4 mm Hg with hydralazine. ⋯ In dogs given hydralazine, cardiac output (CO) and systemic vascular resistance (SVR) remained constant over the 4 hr treatment interval. In contrast, in all other groups, SVR increased and CO decreased (both p less than .05). The short-term pulmonary effects of the above drugs are probably explained by differences in PCWP and/or by regional pulmonary vascular effects.
-
Comparative Study
Classic versus modified Blalock-Taussig shunts in neonates and infants.
Between July 1979 and October 1984, 61 systemic-pulmonary arterial shunts were created in 45 patients. Clinical and angiographic results with 23 classic Blalock-Taussig shunts (BTSs) and 35 modified Blalock-Taussig shunts (MBTSs) with polytetrafluoroethylene grafts between the subclavian and pulmonary arteries were compared. Forty-three of the patients studied were infants: 28 were less than 1 month old, and 19 were less than 1 week old. ⋯ Eight patients required a second shunt, two for anatomic discontinuity of the pulmonary arteries and six because of inadequate blood flow through the first shunt. Among the 35 patients receiving the MBTS, two required early revision (technical error and ductal tissue at the anastomosis). There were no shunt-related deaths, but three (6%) occurred within 30 days of operation from left ventricular infarct, cerebral hemorrhage, sepsis, and severe aortic stenosis with arrhythmias.(ABSTRACT TRUNCATED AT 400 WORDS)