Adaptações fisiológicas precoces e tardias após valvotomia mitral por cateter balão

• Main Author: Oliveira Filho, Japy Angelini [UNIFESP]
• Publication Date: 1998
• Other Authors: Regazzini, Marcelo [UNIFESP], Campos Filho, Orlando [UNIFESP], Salles, Ana Fátima [UNIFESP], Barros Neto, Turibio Leite de [UNIFESP], Novo, Neil Ferreira [UNIFESP], Bocanegra, José [UNIFESP], Martinez Filho, Eulogio Emílio [UNIFESP], Santos Filho, Dirceu Vieira [UNIFESP]
• Format: Article
• Language: por
• Source: Repositório Institucional da UNIFESP
• Download full: http://dx.doi.org/10.1590/S0066-782X1998000200003; http://repositorio.unifesp.br/handle/11600/582
• topic: mitral stenosis; mitral valvuloplasty; exercise test; echocardiogram; estenose mitral; valvoplastia mitral; teste ergométrico; ecocardiograma

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 upright 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±11bpm vs 85±7bpm vs 75±9bpm) 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±3mL/kg/min vs 18±4mL/kg/min vs 22±7mL/kg/min). The anaerobic threshold, minute ventilation (VE) and ventilatory equivalent for oxygen showed no change. The heart rate (1st step: 124±18bpm vs 112±13bpm vs 87±15bpm), O2 uptake (1st step: 10±2mL/kg/min vs 8±2mL/kg/min vs 8±2mL/kg/min) and VE decreased during submaximal exercise in early and late phases. The mitral valve area decreased in the late evaluation (0.94cm² vs 1.66cm² vs 1.20cm²). CONCLUSION: Although partial restenosis tended to occur in these patients, they improved the functional class and cardiorespiratory performance and cardiocirculatory load during submaximal exercise.