The case of a 37 year old woman with hypoparathyroid congestive heart
failure (CHF) is reported. Thyroidectomy had been performed eight year
s earlier and she had experienced symptoms of hypocalcemia postoperati
vely. CHF improved rapidly and completely with the treatment of hypoca
lcemia. Good prognosis is emphasized but it is necessary to think abou
t this cause of ventricular dysfunction in a patient with CHF and a hi
story of neck surgery in order to make an early diagnosis. Pathogenic
mechanisms and differential diagnosis are discussed.