American Association of Endocrine Surgeons| Volume 128, ISSUE 6, P895-902, December 2000

Left ventricular systolic and diastolic function and exercise testing in primary hyperparathyroidism—effects of parathyroidectomy


      Background. Nontraditional manifestations of primary hyperparathyroidism (HPT) are controversial and may include morbidity, mortality, and risk factors for cardiovascular diseases. This study evaluates cardiovascular functions at rest and during exercise in HPT. Method. Thirty patients with HPT (mean serum calcium, 2.97 ± 0.24 mmol/L) and 30 control people with normocalcemia, matched for age and sex, underwent symptom-limited exercise testing and echocardiography before and 13 months (mean) after having a parathyroidectomy. Results. Despite similar maximal workload and blood pressures at rest in patients and healthy controls, HPT associated with higher systolic blood pressure during exercise (P =.03) and increased number of ventricular extrasystolic beats (P =.04). There was also an operatively reversible increase in ST-segment depression during exercise. Echocardiography showed an increased left ventricular (LV) isovolemic relaxation time (P =.02) and mitral deceleration time (P =.08), which indicate an LV diastolic dysfunction that could be partially reversed by operation. LV systolic function (ejection fraction and shortening fraction) tended to be elevated in HPT (P =.07 and.06, respectively) and diminished after parathyroidectomy. There was a trend toward higher LV mass, especially among the men with HPT (P =.06), which was unchanged postoperatively. Conclusions. HPT couples to reversible signs of myocardial ischemia and LV dysfunctions with a possible increased risk of life-threatening arrhythmia. (Surgery 2000;128:895-902.)
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