PROSPECTIVE STUDIES ON LEFT-VENTRICULAR GEOMETRIC PATTERNS AND EXERCISE TOLERANCE IN UNMEDICATED MEN WITH BORDERLINE AND MILD HYPERTENSION

Objective This study was designed and conducted to assess the clinical significance of left ventricular geometric patterns and physical fitn ess in subjects with untreated borderline and mild hypertension. Metho ds Symptom-limited maximal treadmill stress testings and echocardiogra phic examinations were administered to 192 previously unmedicated men. Left ventricular geometric patterns were determined by the combined c riteria of left ventricular mass index and relative wall thickness. Su bjects whose left ventricular mass index was <125 g/m(2) were followed up for more than 3 years. Results Normalized treadmill time was lower and pressure rate products at peak exercise were higher in patients w ith concentric hypertrophy than in those with normal geometry, Of the 77 patients who revealed left ventricular mass index at baseline <125 g/m(2) and who were successfully followed without medication for more than 3 years, 18 demonstrated concentric hypertrophy at the final foll ow-up examination, During the follow-up period, these 18 patients had significant further augmentation of concentric geometric features, sig nificant decreases in both cardiac output and normalized treadmill tim e, and significant increases in casual blood pressure and total periph eral resistance compared with those at baseline. Conclusion Patients w ith concentric hypertrophy exhibited slightly but significantly impair ed levels of physical fitness and cardiac work efficiency, and the pro gression of concentric hypertrophy demonstrated further impairments of these conditions, Therefore, not only lowering blood pressure, but al so improving left ventricular hypertrophy, cardiovascular hemodynamics , and physical fitness might be required in patients with concentric h ypertrophy.