STUDY OF RISK-FACTORS LEADING TO CORONARY HEART-DISEASE IN URBAN ZULUS

Coronary heart disease (CHD) is still relatively uncommon in the black population of South Africa. We embarked on a study to determine the p revalence of risk factors leading to CHD in the black population of Du rban. The study sample was selected from patients attending a dental c linic at a hospital. A total of 458 Zulus (age range 16-69 years) were studied. The prevalence of CHD was 2.4%. The prevalence percentage of selected risk factors were: hypertension (SBP greater-than-or-equal-t o 140 mmHg and/or a DBP greater-than-or-equal-to 90 mmHg) was 28%, mal es 31.9%, females 25.4%; protective levels of high density lipoprotein cholesterol/total cholesterol (HDLC/TC) (greater-than-or-equal-to 20% ) were 81.3%; diabetes, males 4.9%, females 2.9%; smoking greater-than -or-equal-to ten cigarettes per day, males 28.1%, females 3.4%; obesit y, males 3.7%, females 22.6%. We have found the Minnesota Coding Syste m for ECG changes of CHD and Rose questionnaire to be unreliable for e liciting CHD in Blacks. Hypercholesterolaemia is less common and this may explain the low incidence of CHD in Blacks. Epidemics of CHD as se en in the Indian, 'mixed' and white South Africans can still be preven ted in the black population but preventive measures must be instituted rapidly.