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- W2030372119 startingPage "3443" @default.
- W2030372119 abstract "Background In patients with mitral stenosis, reduced cardiac output or altered pulmonary hemodynamics may increase sympathetic nerve activity. However, the magnitude of the increase in sympathetic activity in such patients and the effect of valvuloplasty on this activity are unknown. Methods and Results We microneurographically measured muscle sympathetic nerve activity before and after mitral valvuloplasty in 10 patients (mean±SEM age, 48±2 years) with mitral stenosis and in 10 healthy volunteers (47±4 years); hemodynamic variables were also measured. Baroreflex sensitivity was assessed on the basis of the ratio of the change in heart rate or muscle sympathetic activity to the change in mean arterial pressure during intravenous infusion of sodium nitroprusside or phenylephrine. At baseline, muscle sympathetic activity was significantly higher in the patients with mitral stenosis than in the control subjects (42.1±3.2 versus 26.1±3.7 bursts/min, P <.05). However, there was no significant difference between the groups in sympathetic activity at 1 week after valvuloplasty. The reduction in sympathetic activity after valvuloplasty was maintained for ≥6 months and correlated with the increase in cardiac index ( r =.74, P <.05). Baroreflex sensitivity was significantly lower in the patients than in the control subjects, but after valvuloplasty there was no significant difference in baroreflex sensitivity between the groups. Conclusions Sympathetic activity is increased in patients with mitral stenosis. Mitral valvuloplasty in such patients results in early and long-lasting normalization of sympathetic nerve activity, possibly because of an improvement in arterial baroreflex sensitivity." @default.
- W2030372119 created "2016-06-24" @default.
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- W2030372119 date "1997-11-18" @default.
- W2030372119 modified "2023-09-26" @default.
- W2030372119 title "Percutaneous Transluminal Mitral Valvuloplasty Normalizes Baroreflex Sensitivity and Sympathetic Activity in Patients With Mitral Stenosis" @default.
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- W2030372119 doi "https://doi.org/10.1161/01.cir.96.10.3443" @default.
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