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  • Title: [Early and late physiological effects of balloon mitral valvuloplasty].
    Author: Oliveira Filho JA, Regazzini M, Campos Filho O, Salles AF, Barros Neto TL, Novo NF, Bocanegra J, Martinez Filho E, Santos Filho DV.
    Journal: Arq Bras Cardiol; 1998 Feb; 70(2):81-6. PubMed ID: 9659713.
    Abstract:
    PURPOSE: To evaluate the early and late cardiorespiratory responses after balloon mitral valvuloplasty. METHODS: Nine female patients aged 35 +/- 9 years with mitral stenosis, in class II or III (NYHA) underwent up-right ergoespirometric test, resting electrocardiogram and echocardiogram before, 3 to 5 days (early evaluation) and 8 to 12 months (late evaluation) after mitral valvuloplasty. All patients were treated with digitalis and diuretics. RESULTS: During late evaluation, 44% patients were in class II and 56% were in class I (NYHA). The resting heart rate decreased (87 +/- 11 bpm vs 85 +/- 7 bpm vs 75 +/- 9 bpm) and the number of steps increased (4 +/- 1 steps vs 5 +/- 2 steps vs 6 +/- 1 steps); the peak oxygen uptake improved only in the late evaluation (16 +/- 3 mL/kg/min vs 18 +/- 4 mL/kg/min vs 22 +/- 7 mL/kg/min). The anaerobic threshold, minute ventilation (VE) and ventilatory equivalent for oxygen showed no change. The heart rate (1st step: 124 +/- 18 bpm vs 112 +/- 13 bpm vs 87 +/- 15 bpm), O2 uptake (1st step: 10 +/- 2 mL/ kg/min vs 8 +/- 2 mL/kg/min vs 8 +/- 2 mL/kg/min) and VE decreased during submaximal exercise in early and late phases. The mitral valve area decreased in the late evaluation (0.94 cm2 vs 1.66 cm2 vs 1.20 cm2). CONCLUSION: Although partial restenosis tended to occur in these patients, they improved the functional class and cardiorespiratory performance and cardiocirculatory load during submaximal exercise.
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