Malignant hypertension and its renal complications in black South Africans.

Malignant hypertension is an important cause of morbidity and mortality among urban black South Africans. Hypertension accounts for 15.9% of all patients and for 34.6% of blacks receiving treatment for end-stage renal failure. Malignant hypertension is more commonly diagnosed than benign hypertension and two-thirds of patients present in the age group 30 - 49 years. Together they are the most common preventable cause of end-stage renal failure in this country. Acute partially reversible renal failure occurs in 20% of patients with malignant hypertension who require dialysis. This is an important subgroup, who may be recognised by their younger age, female preponderance and fulminant presentation. Short-term peritoneal dialysis and effective control of blood pressure will result in satisfactory return of renal function. However, only adequate country-wide control of hypertension will prevent these costly renal complications.