A 64-year-old white woman was referred to the Hypertension Unit of the Massachusetts General Hospital for evaluation and management of resistant hypertension. Past history revealed that she had had mild hypertension for 20 years, adult onset diabetes for 2 years, a myocardial infarction 7 years earlier, congestive heart failure, and angina. Her main complaint at the time of her initial evaluation was dyspnea, which mainly occurred with exertion. Indeed, she could only walk one block before having to stop because of dyspnea. She denied symptoms suggestive of intermittent claudication or cerebrovascular disease, and her angina was stable and mild. Her height was 4 ft 9 in., and she weighed 200 pounds.The patient's blood pressure was 196/118 mm Hg standing and 176/122 mm Hg lying, as recorded with an appropriately large cuff. The pulse was 88 bpm and regular. There was no delay of the femoral pulses and no abdominal or arterial bruits. The apex beat was displaced 2 cm to the left of the midclavicular line, and a palpable S4 was evident. Auscultation of the precordium confirmed the presence of a fourth heart sound, Address for reprints: Dr. Gordon S. Stokes, Royal North Shore Hospital, St. Leonards, N.S.W. 2965, Australia. but no S3 or murmur was present. Fundoscopy revealed Keith and Wagener (KW) Grade III changes with hemorrhages and marked arteriolar narrowing, but no exudates. The optic discs were sharp, and venous pulsations were evident. Neurological examination was normal. Medications included digoxin 0.25 mg four times daily, isosorbide dinitrate (Isordil) 40 mg four times daily, propranolol (Inderal) 40 mg four times daily, prazosin 6 mg times daily, trinitroglycerin one tablet as needed, hydrochlorothiazide 25 mg/ triamterene 50 mg (Dyazide) two tablets four times daily, and isophane (NPH) insulin, 58 U subcutaneously once per day.The patient was immediately hospitalized, and nifedinine 10 mg four times daily was added to the regimen. Shortly thereafter, she developed overt cardiac failure associated with a drop in blood pressure to 100/90 mm Hg. She responded to conventional therapy and temporary discontinuation of the antihypertensive medications.Relevant investigations performed over the next week were as follows. An electrocardiogram showed normal sinus rhythm, with changes consistent with an old anterolateral apical myocardial infarction, and ST segment elevation in leads V2-V5 that suggested an anteroapical aneurysm. Renal function, complete blood count, and biochemical profile were essentially normal. Serial cardiac enzyme determinations were normal. The blood sugar level was 283 mg/dl. A gated blood pool scan revealed a markedly hypertrophied left ventricle, a large apical aneurysm that emptied almost completely during systole and an ejection fraction of 54%. Doppler studies of the carotid arteries were normal. Pulmonary function studies showed changes consistent with poorly reversible chronic obstructive pulmonary disease. A thallium scan with persantin provocation was negative for myocardial isch...