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Malignant hypertension with severe hyponatraemia, hypokalaemia, depletion of sodium and potassium, and elevated blood levels of renin, angiotensin I, angiotensin II, aldosterone, and arginine vasopressin developed in a woman with renal-artery occlusion. Plasma angiotensin II was disproportionately high in relation to exchangeable sodium. Captopril, by inhibiting conversion of angiotensin I to angiotensin II, further elevated the blood levels of renin and angiotensin I but corrected all other abnormalities. Unilateral nephrectomy was subsequently curative.
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