AIM:To investigate the clinical significance of the variations of blood plasma haptoglobin(Hp) in premature coronary heart disease(PCAD) patients with essential hypertension and to study the clinical correlations between the level of plasma Hp and PACD-essential hypertension.METHODS: Ninety patients with PACD confirmed by coronary angiography were enrolled in this study and 90 healthy subjects were selected as control.According to the levels of blood pressure(Bp),the patients were divided into three groups;...