Abstract：Objective To investigate the influence of morning blood pressure surge (MBPS) on occult coronary heart disease (CHD, 50%≤coronary stenosis degree <70%) without critical lesion. Methods Ninety-two occult CHD patients with subcritical lesions were selected. All the patients had no clinical symptom of angina; coronary angiography(CAG) examination implies that the stenosis degree of the main coronary artery was ≥50% and <70%. Ambulatory blood pressure and ambulatory electrocardiography examination were synchronously performed one week after surgery. Patients with MBPS ≥23.6 mmHg were set as MBPS group (54 cases) while those with MBPS＜23.6 mmHg were set as the non-MBPS group (38 cases). The influence of MBPS on the STsegment of the ECG of patients in different groups was observed. Results The early morning systolic and diastolic blood pressure, and the proportion of patients with depressed ST-segment in the MBPS group are higher than those in the nonMBPS group, with statistically significant differences (P<0.05). ConclusionM BPS could give rise to ST-segment depression of ECG in occult CHD patients with subcritical lesions, and therefore it is important for these patients to control MBPS.
