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The study objective was to assess the prevalence, level of treatment, and control of hypertension in CHDs patients. We conducted a cross-sectional survey on 1109 patients hospitalised for a first episode of MI in the main hospitals of the District of Tunis during the period 1999-2000. Hypertension and control level are defined according to the JNC recommendations. HBP is defined as SBP > = 140 and or DBP > = 90 mm Hg and the use of blood pressure-lowering medication for the indication of hypertension. Hypertension is controlled by medication if SBP < 140 and DBP < 90 mm Hg. We conduct analysis by socio demographic variables, medical history and CHDs risk factors. 54.9% men and 72.1% women were hypertensive. The prevalence of hypertension increases with age in both genders. The logistic regression have shown that the age-adjusted odds ratios were statically significant for diabetes, obesity, high cholestrolemia and cigarettes smoking. Only 68.9% of the hypertensive were aware of having hypertension, women were more aware than men (84.6% versus 61.7%, p < 0.001). Awareness increase with age and education level. Among hypertensive, 94.4% were treated but only 41.3% were controlled. The study highlights the problem of the hypertension, and contributes to identify the iceberg of this CHDs risk factor. An effort must be done to involve the health personnel for educating patients, the population for changing their life style and manager for enhancing the availability of drugs. The question is how much will be the cost of HBP and CVDs control for a country which has a limited resources.