Kocher and more recently Lahey have pointed out that a subtotal thyroidectomy performed on patients with congestive heart failure and hyperthyroidism frequently results in a definite and lasting improvement of the circulation. Blumgart found that in patients with congestive heart failure and a normal basal metabolic rate the basal velocity of the blood flow is greatly slowed and that, while the blood flow may be similarly slowed in patients with the low metabolic rate of myxedema, such patients do not show signs of congestive heart failure. He concluded that the diminished circulation of these patients is adequate for the diminished demands of the body. Observations on a patient who showed improvement following a subtotal thyroidectomy for suspected masked hyperthyroidism, later proved to be normal, suggested to Blumgart, Levine and Berlin1 that the removal of the normal thyroid gland might be helpful in cardiac failure not due to thyrotoxicosis. Subtotal
TOTAL THYROIDECTOMY FOR CONGESTIVE HEART FAILURE. JAMA. 1937;109(3):210–211. doi:10.1001/jama.1937.02780290032011
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