The Impact of Multiple Antihypertensive Therapy on Post-Induction Hypotension Burden in Cardiac Surgery Patients

Konya City Hospital

Status: Enrolling

Conditions: Hypotension on Induction; Cardiac Surgery; Antihypertensive Agents; Anesthesia, Intravenous; Hemodynamics

Treatments: Other: Chronic Antihypertensive Medication Use

Study type: Observational

Funder types: Other

Identifiers

NCT07541222

2026/026

Details and patient eligibility

About

This study aims to investigate the impact of multiple preoperative antihyperstensive drug use on the burden of post-induction hypotension (PIH) in patients undergoing elective cardiac surgery. The researchers will observe whether the combination of different antihypertensive classes (such as ACE inhibitors, ARBs, beta-blockers, and calcium channel blockers) leads to a higher incidence and severity of blood pressure drops and increased need for vasoactive support during the period between anesthesia induction and surgical incision.

Full description

Post-induction hypotension (PIH) is a critical period in cardiac anesthesia that can lead to organ hypoperfusion. This prospective observational study will include patients aged 18-85 with ASA III-IV physical status scheduled for elective cardiac surgery.

Preoperatively, patients' chronic antihypertensive medications will be recorded and categorized. Following standard anesthesia induction, hemodynamic parameters will be monitored using invasive arterial blood pressure measurement. PIH burden will be defined as the area under the curve (AUC) for a mean arterial pressure (MAP) lower than 65 mmHg. Additionally, the study will record the total dose of ephedrine or other vasoactive agents required to maintain hemodynamic stability. The primary goal is to determine if multiple antihypertensive therapy is an independent risk factor for increased PIH burden and to compare the effects of different drug combinations on early intraoperative hemodynamics.

Enrollment: 160 estimated patients

Sex: All

Ages: 40+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Adult patients aged 40 years and older
• Undergoing elective cardiac surgery (e.g., isolated CABG, isolated valve surgery, or combined CABG+valve surgery via sternotomy)
• Regular use of at least one antihypertensive medication for at least 4 weeks prior to the operation date
• Voluntary participation and signed informed consent

Exclusion criteria

• Emergency surgery
• Preoperative shock or requirement for high-dose inotropic/vasopressor therapy
• End-stage liver or kidney failure
• Uncontrolled hypertension
• Difficult intubation or prolonged induction process
• Ejection fraction less than 35%

Trial design

160 participants in 1 patient group

Study Cohort

Description:

Adult patients aged 18 to 85 years with ASA physical status III-IV, who are scheduled to undergo elective cardiac surgery under general anesthesia.

Treatment:

Other: Chronic Antihypertensive Medication Use