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Acute hemodynamic effects of nitroprusside in children with isolated mitral regurgitation
Insights
Nitroprusside effectively reduces cardiac pressures and systemic resistance in children with congenital mitral regurgitation. This medication significantly improves cardiac output, regardless of whether patients receive digitalis or diuretics.
Area of Science:
- Pediatric Cardiology
- Cardiovascular Pharmacology
- Congenital Heart Disease
Background:
- Congenital mitral regurgitation (MR) presents unique challenges in pediatric cardiovascular care.
- Understanding the hemodynamic effects of vasodilators is crucial for managing pediatric heart conditions.
Purpose of the Study:
- To evaluate the acute hemodynamic effects of nitroprusside in children with isolated congenital mitral regurgitation.
- To compare the response to nitroprusside in children with and without concurrent digitalis or diuretic therapy.
Main Methods:
- A prospective study involving 12 children with congenital mitral regurgitation undergoing cardiac catheterization.
- Hemodynamic parameters were measured using a multisensor catheter system during nitroprusside infusion (2.0 µg/kg/min).
- Patients were divided into two groups: those receiving digitalis or diuretics and those not.
Main Results:
- Nitroprusside significantly decreased mean right atrial pressure and pulmonary artery wedge pressure in both groups.
- Systemic vascular resistance was reduced by approximately 40% in all patients.
- Forward cardiac output increased substantially, by 48-58%, in both treatment groups.
- No significant differences in hemodynamic response were observed between the medication and no-medication groups.
Conclusions:
- Nitroprusside is an effective vasodilator in children with congenital mitral regurgitation, improving hemodynamic function.
- The efficacy of nitroprusside in this context is not significantly altered by the concurrent use of digitalis or diuretics.
- These findings support the use of nitroprusside for acute hemodynamic management in pediatric congenital MR.
Abstract:
The acute hemodynamic responses to nitroprusside during cardiac catheterization were evaluated in 12 children with isolated mitral regurgitation (MR) of congenital origin. The patients were classified into 2 groups. Group I consisted of 5 patients who received digitalis or diuretic drugs and group II consisted of 7 patients who received no medication. Hemodynamic measurements were performed using a multisensor catheter system during infusion of nitroprusside at a dose of 2.0 micrograms/kg/min. With nitroprusside, the mean right atrial pressure decreased an average of 50% in group I (from 6 +/- 1 to 3 +/- 1 mm Hg) and 75% in group II (from 4 +/- 1 to 1 +/- 1 mm Hg), and the mean decrease of pulmonary artery wedge pressure was 50% in group I (from 14 +/- 3 to 7 +/- 3 mm Hg) and 56% in group II (from 9 +/- 2 to 4 +/- 1 mm Hg). Administration of nitroprusside also caused a significant reduction in systemic vascular resistance by 40% in both groups (from 25 +/- 6 to 15 +/- 5 U/m2 in group I and from 25 +/- 2 to 15 +/- 3 3 U/m2 in group II), whereas forward cardiac output increased markedly, by an average of 48% in group I (from 3.3 +/- 0.5 to 4.9 +/- 0.9 liters/min/m2) and 58% in group II (from 3.3 +/- 0.3 to 5.2 +/- 0.8 liters/min/m2). No significant differences in hemodynamic response between groups I and II were noted.(ABSTRACT TRUNCATED AT 250 WORDS)