How is intra-op hypotension defined?

Intraoperative hypotension is generally characterized by a significant drop in blood pressure compared to a patient's baseline measurements before surgery. The most widely accepted definition involves a decrease of 20-30% from the preoperative baseline blood pressure. This range is clinically significant because it indicates that the patient may not be adequately perfused, which can jeopardize organ function and affect overall surgical outcomes.

The importance of identifying hypotension during surgery is underscored by the fact that maintaining optimal blood pressure is critical for ensuring proper organ perfusion and reducing the risk of complications. A decrease of less than 20% might not be considered substantial enough to prompt immediate intervention, while a decrease of more than 30% could indicate a more severe physiological response and usually warrants swift medical intervention. Therefore, the range selected aligns well with clinical practices and guidelines for monitoring and responding to intraoperative hypotension.