What is the recommended flow rate for RCP during DHCA?

The recommended flow rate for rapid circulatory support during deep hypothermic circulatory arrest (DHCA) typically falls within the range of 100-500 mL/min. This range is crucial as it ensures an adequate flow to maintain perfusion to vital organs while the body is in a hypothermic state. During DHCA, the metabolic requirements of the body decrease significantly due to the lowered temperature, allowing for a more tolerable period of circulatory arrest.

A flow rate of 100-500 mL/min is well-defined to provide sufficient organ perfusion without causing excessive shear stress or damage to the blood. It balances the need to maintain systemic perfusion with the specific requirements of the procedure being performed and the physiological state of the patient.

Other options are not appropriate for various reasons. For instance, flow rates that are too low, such as those suggested in other answer choices, can lead to inadequate perfusion of organs, potentially resulting in ischemia. Conversely, excessively high flow rates may lead to complications such as increased resistance and damage to vascular tissues. Therefore, the range of 100-500 mL/min is established to optimize patient outcomes during DHCA.