Perioperative metabolic changes in patients undergoing cardiac surgery

Area of Science:

• Cardiology
• Metabolic Medicine
• Surgical Critical Care

Background:

• Cardiac surgery induces significant perioperative metabolic changes beyond surgical trauma and cardiopulmonary bypass.
• These changes are influenced by systemic inflammatory response, hypothermia, neuroendocrine shifts, and perioperative medications.

Purpose of the Study:

• To elucidate the multifaceted metabolic alterations occurring during the perioperative period in cardiac surgical patients.
• To explore the relationship between preoperative nutritional risk and postoperative outcomes.
• To assess the safety and tolerability of early nutritional interventions in cardiac surgery.

Main Methods:

• Review of pathophysiologic changes including oxygen consumption, hormonal secretion, and metabolic consequences.
• Definition and assessment of preoperative nutritional risk factors.
• Analysis of outcomes associated with early postoperative nutrition.

Main Results:

• Metabolic changes include increased oxygen consumption, hormonal secretion (ACTH, cortisol, catecholamines, insulin, growth hormone), and decreased tri-iodothyronine.
• Observable consequences include hyperglycemia, hyperlactatemia, altered amino acid and fatty acid levels, hypokalemia, and inflammatory marker changes.
• Preoperative nutritional risk is linked to adverse postoperative outcomes.
• Early nutrition in cardiac surgery is demonstrated to be safe and well-tolerated.

Conclusions:

• Perioperative metabolic derangements in cardiac surgery are complex and multifactorial.
• Nutritional status pre-surgery is a critical factor influencing patient outcomes.
• Early nutritional support is a safe and viable strategy in the management of cardiac surgery patients.