Haemodynamics and renal function in patients undergoing surgery for abdominal aortic aneurysm

Area of Science:

• Cardiovascular Surgery
• Nephrology
• Surgical Hemodynamics

Background:

• Abdominal aortic aneurysm (AAA) surgery involves significant physiological stress.
• Understanding hemodynamic changes during infrarenal aortic clamping is crucial for patient management.
• Renal function monitoring is essential due to the proximity of the aorta to the kidneys.

Purpose of the Study:

• To establish baseline hemodynamic and renal function criteria during AAA surgery.
• To investigate the effects of infrarenal aortic clamping on cardiovascular parameters.
• To assess the impact of aortic clamping on renal function.

Main Methods:

• Prospective study of patients undergoing AAA surgery.
• Monitoring of hemodynamic parameters including mean arterial pressure (MAP), cardiac index (CI), pulmonary artery wedge pressure (PAWP), and systemic vascular resistance index (SVRI).
• Assessment of renal function before, during, and after infrarenal aortic clamping.

Main Results:

• Mean arterial pressure (MAP) remained stable during aortic clamping.
• A significant decrease in cardiac index (CI) was observed.
• Pulmonary artery wedge pressure (PAWP) decreased significantly, while systemic vascular resistance index (SVRI) increased, suggesting preoperative dehydration or venous pooling.
• No irreversible renal function loss was detected.

Conclusions:

• Infrarenal aortic clamping in AAA surgery causes significant hemodynamic shifts, notably a reduced cardiac index.
• Careful preoperative fluid status assessment and management are recommended.
• The observed changes did not lead to irreversible renal impairment in this cohort.