Risk analysis of cardiovascular events in elderly hypertensive patients with different risk stratification during the perioperative period

To study the risks of cardiovascular events of elderly hypertensive patients with different risk stratification during the perioperative period. 126 elderly hypertensive patients without cardiac surgery were selected and divided into following 3 groups: group I (in danger), group II (high-risk), group III (very high-risk), each group with 42 cases. Control group was randomly selected 42 elderly patients without hypertension and other cardiovascular risk factors. Sevoflurane, Etomidate, Propofol, Cisatracurium Besilate for Injection, Fentanyl were used to induction and maintenance of anesthesia. Patients' cardiac index (CI), cardiac output (CO), stroke volume (SV), systemic vascular resistance (SVR), peak velocity (Vpk), heart rate (HR), mean arterial pressure (MAP) were monitored by ultrasonic cardiac output monitor (ultrasonic cardiac output monitor, USCOM). Pre- and post-operative myocardial ischemia and arrhythmia were monitored by dynamic electrocardiogram (dynamic electrocardiography, DCG). Incidence myo