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[Hemodynamic effects of intravenous isosorbide dinitrate in acute myocardial infarct]
Insights
Intravenous isosorbide dinitrate (ISDN) effectively reduced pulmonary capillary pressure and improved cardiac output in acute myocardial infarction patients. It acts as a mixed vasodilator, beneficial for those with high pulmonary pressure and low cardiac output.
Area of Science:
- Cardiology
- Pharmacology
Context:
- Acute myocardial infarction (AMI) presents significant hemodynamic challenges.
- Effective management of AMI requires precise hemodynamic monitoring and intervention.
Purpose:
- To evaluate the hemodynamic effects of intravenous isosorbide dinitrate (ISDN) in patients with acute myocardial infarction.
- To determine ISDN's vasodilatory profile (venous vs. mixed) and its impact on key hemodynamic parameters.
Summary:
- Intravenous ISDN (3-9 mg/hour) was administered to 15 AMI patients, with hemodynamic parameters assessed via right heart and radial catheterization.
- Significant reductions in pulmonary capillary pressure (-24%) and increases in stroke volume index (+21%) and cardiac index (+13%) were observed in most patients.
- Hemodynamic changes were primarily attributed to alterations in pulmonary and systemic vascular resistances, suggesting a mixed vasodilator effect.
Impact:
- Intravenous ISDN demonstrates efficacy in improving hemodynamic status in AMI patients.
- The findings support the use of ISDN in AMI patients experiencing high pulmonary capillary pressure and low cardiac output.
- ISDN's classification as a mixed vasodilator provides valuable clinical guidance for its application in critical cardiac care.
Abstract:
The hemodynamic effects of intravenous isosorbiddinitrate (ISDN) were studied in 15 patients with acute myocardial infarction. Pressure and flow parameters were measured by right heart and radial catheterization and by the thermodilution method. 3-9 mg/hour ISDN was infused intravenously and the hemodynamic values were measured during half an hour in clinically stable state. The statistical analysis was carried out by paired Student's t-test and factors analysis. After ISDN therapy 10 patients showed a significant fall in pulmonary capillary pressure (-24%), 9 a rise in stroke volume index (+21%) and cardiac index (+13%). Two patients only exhibited a rise in pulmonary capillary pressure (+10%) and one a fall in cardiac index (-5%). ISDN changes in pulmonary capillary pressure, stroke volume and cardiac output were mainly due to changes in pulmonary and systemic vascular resistances and much less to those in the systemic venous bed. It can be supposed that intravenous ISDN behaves more like a mixed than a venous vasodilator and can be recommended for acute myocardial infarction patients with high pulmonary capillary pressure and low cardiac output.