During thoracoabdominal procedures, a significant amount of cardiac output is directed to the lower body due to the anatomical and physiological considerations associated with the positioning of the patient and the nature of the surgical procedure. Generally, the distribution of cardiac output towards different regions of the body is influenced by factors such as gravity, vascular resistance, and the need for perfusion of various organs.
In a thoracoabdominal position, especially when considering the impact of surgical manipulation and potential effects of anesthesia, the lower body tends to receive a substantial proportion of blood flow. Research and clinical practices indicate that around 60% of cardiac output may be allocated to the lower body during these types of procedures. This allocation is critical for ensuring adequate perfusion to the lower extremities and abdominal organs, which may be affected by increased intra-abdominal pressure and other factors during surgery.
Understanding this distribution of cardiac output is vital for perfusionists and surgical teams, as it aids in anticipating and managing hemodynamic changes during operations involving the thorax and abdomen.