Post Procedural Hypotension

Low blood pressure after surgery is a common problem that can lead to serious complications if not properly managed. Understanding its causes and knowing how to respond can help patients recover safely.

Table of contents

• What Is Post Procedural Hypotension?
• What Causes Low Blood Pressure After Surgery?
• How It Affects Your Health
• Managing Low Blood Pressure After Surgery

What Is Post Procedural Hypotension?

Post procedural hypotension, also called postoperative hypotension, refers to low blood pressure that occurs after a surgical procedure. This condition is part of what doctors call perioperative hypotension, which includes low blood pressure that happens during and after surgery.^[1]

Normal blood pressure is around 120/80 mmHg. When blood pressure falls to 90/60 mmHg or below, it is considered low blood pressure or hypotension. However, the exact threshold can vary depending on the individual patient and the specific situation.^[3]

Low blood pressure after surgery is quite common in patients. According to research, postoperative hypotension after non-cardiac surgery is common, profound, and often goes undetected by current monitoring methods on regular hospital wards.^[4]

Blood pressure is the most important factor that influences how well blood reaches your organs. Mean arterial pressure (MAP), which is the average blood pressure throughout one heartbeat, is the fundamental predictor of how well blood flows to your organs.^[1]

What Causes Low Blood Pressure After Surgery?

Several factors can cause blood pressure to drop during or after a surgical procedure. Understanding these causes helps medical teams provide appropriate treatment.^[1]

Anesthesia

Anesthetic drugs used to put patients to sleep during surgery can affect blood pressure. Changes may occur while a patient is under anesthesia or as the effects of the drugs wear off. For some people, anesthesia causes a significant drop in blood pressure. When this happens, doctors monitor the situation closely and give medications through an intravenous line to help bring blood pressure back to normal.^[3]

Hypovolemic Shock

Hypovolemic shock occurs when the body goes into shock because of severe blood or fluid loss. Losing a large amount of blood during surgery causes a drop in blood pressure. A decrease in blood volume also means less blood supply, making it difficult for organs to function properly. The goal of treatment is to restore the blood and fluids in the body before damage occurs to vital organs, especially the kidneys and heart.^[3]

Septic Shock

Sepsis is a life-threatening complication caused by bacterial, fungal, or viral infections. It causes the walls of small blood vessels to leak fluid into surrounding tissues. A serious complication of sepsis is called septic shock, which often presents with significant postoperative hypotension. Sepsis is treated in the hospital with methods such as antibiotics, volume replacement, and monitoring. To treat low blood pressure after surgery due to septic shock, doctors may give medications called vasoconstrictors, which help blood vessels constrict to increase blood pressure.^[3]

How It Affects Your Health

Postoperative low blood pressure significantly affects patient outcomes. Blood pressure level is the most crucial factor that influences organ perfusion, which is how well blood reaches different parts of the body. Hypoperfusion (insufficient blood flow) and organ dysfunction are correlated based on their severity associated with hypotension.^[1]

Low blood pressure after surgery puts patients at risk of damage to vital organs such as the heart and brain due to lack of oxygen.^[3] Research has linked low blood pressure during and after surgery to several serious complications.

Studies show that hypotension during surgery has been linked to a higher risk of death after surgery, myocardial injury (heart muscle damage) after non-cardiac surgery, heart attack, cardiogenic shock (when the heart cannot pump enough blood), acute renal failure (sudden kidney failure), delirium (confusion), and stroke in patients undergoing non-cardiac surgery under general anesthesia.^[1]

Although blood flow regulation protects the brain, heart, and kidneys from hypotension-induced low blood flow, blood pressure is almost entirely responsible for blood flow to other organ systems. This is particularly true for organs in the abdomen, such as the stomach, liver, and pancreas, which have a low capacity to regulate their own blood flow.^[2]

Available data suggest that postoperative hypotension is associated with adverse outcomes after surgery, especially heart muscle injury, acute kidney injury, and death.^[4]

Managing Low Blood Pressure After Surgery

Postoperative hypotension occurs when patients are in the hospital being treated for emergencies such as blood loss. However, low blood pressure after being discharged home can be dangerous if the patient does not receive proper care.^[3]

In the Hospital

During hospital care, anesthetists and medical teams must promptly identify the cause of low blood pressure for appropriate treatment. Early detection of oncoming hypotension or its clinical prediction is of paramount importance in allowing doctors to treat hypotension and reduce the occurrence and length of low blood pressure episodes promptly and aggressively.^[1]

At Home After Surgery

There are several ways to manage low blood pressure at home after surgery:^[3]

Stand up slowly: This helps to slowly stretch the blood vessels, making it easier for blood to circulate. After waking up, avoid standing up immediately. Instead, transition gradually from lying down to sitting with your feet on the floor. Hold this position for at least 60 seconds to allow your body to adjust, then gently swing your legs for one to two minutes before standing.

Do not use stimulants such as coffee and alcohol: Both of these substances cause dehydration, which can lead to low blood pressure.

Eat small meals: Some people have the habit of eating large, high-carbohydrate meals, which can cause a sudden drop in blood pressure immediately after eating. This is referred to as postprandial hypotension or orthostatic hypotension. Therefore, you should maintain small main meals with low carbohydrate content and add healthy snacks between main meals.

Maintain proper nutrition: Many patients after surgery experience appetite loss. During this time, not getting enough nutrients is also a cause of low blood pressure after surgery. The body requires a lot of energy for the recovery process. Adequate nutrition, especially protein, is especially necessary for wound healing.^[3]