A simultaneous comprehensive epidemiological survey of 1198 cattle-breeders was conducted in central and southern Tuva. CHD in men was diagnosed in 11.1%, in women in 24.0% (all of them aged 20 to 69). Changes in the end part of the ventricular complex were more common, particularly in women. Arrhythmia and angina of effort were very rare. Functional ECG tests (including propranolol, piridamole, bicycle ergometry) brought about negative results with relation to CHD. Positive correlation was shown between CHD prevalence and AH frequency, negative correlation--between CHD prevalence and smoking frequency. Rare excessive body mass and fat metabolic derangements probably accounted for the absence of correlation of these indices with CHD frequency. A high AH frequency was revealed in men (12.3%) and women (28.8%). Left ventricular hypertrophy was noted in 25.8% of men, of them raised BP was noted in 36.6% only; in women these figures were 12.7 and over 50%, respectively. Some peculiarities of the epidemiology of CHD and its risk factors in Tuva indicated a high frequency of noncoronarogenic myocardial pathology, rare occurrence of CHD, and low specificity of the Minnesota code criteria for the detection of this disease in the population under study.