Why Low Blood Pressure Can Delay Your Surgery in the UAE

Being admitted to hospital for a surgical procedure is a moment of heightened anxiety for most patients. The last thing anyone expects, after weeks or months of preparation, is to be told at the eleventh hour that their operation cannot proceed because of a number on a monitor. Yet low blood pressure at the time of surgery is a real and clinically important reason to pause, reassess, and in some cases, delay or reschedule a procedure.

Dr. Sherief Elsayed, Consultant Spine Surgeon in Dubai, describes exactly this scenario from direct clinical experience and explains why the decision to delay is not excessive caution but is, in specific circumstances, the right clinical call.

The Clinical Scenario: A Young Patient With a Drop in Blood Pressure

Dr. Sherief Elsayed describes the situation: “My patient is a young, healthy male and his blood pressure dropped because he was very fearful of needles. We brought it back up with medication so it’s safe to proceed.”

This is a vasovagal response, one of the most common causes of acute hypotension in otherwise healthy individuals. The sight of needles or medical equipment, anxiety, pain, or emotional stress triggers an exaggerated parasympathetic nervous system response: the heart rate drops, peripheral vessels dilate, and blood pressure falls. It is not a cardiac pathology. It is a physiological response to a psychological trigger.

In a young, healthy person, a vasovagal episode that responds quickly to simple measures such as lying down, elevating the legs, and if needed, a small dose of a vasopressor agent, is manageable. The blood pressure recovers, the physiological state returns to baseline, and surgery can proceed safely.

The resolution in this case confirms the benign nature of the hypotension: “We brought it back up with medication so it’s safe to proceed.”

When Low Blood Pressure Cannot Simply Be Corrected and Surgery Must Wait

The more important clinical message in Dr. Sherief Elsayed’s description is the contrast he draws: “But if it was an elderly person who had dropped their blood pressure because they were septic or because they had lost a lot of blood volume, for example, then we wouldn’t proceed right away. We would need to optimise everything before we were able to undertake any surgery.”

This distinction identifies the two fundamentally different clinical situations in which hypotension before surgery occurs:

Situational or reversible hypotension: Vasovagal response, dehydration from fasting, medication-related (antihypertensive agents taken on the morning of surgery), or anxiety-driven. These causes are identifiable, addressable, and do not indicate underlying haemodynamic instability. Once corrected, the physiological reserve is sufficient to safely tolerate surgery and anaesthesia.

Pathological hypotension requiring optimisation: Sepsis, active haemorrhage, severe dehydration from illness, cardiac failure, or other conditions producing systemic haemodynamic compromise. In these situations, the blood pressure is not low because of a transient trigger but because the body’s compensatory mechanisms are struggling to maintain perfusion. Proceeding with surgery in this state risks catastrophic haemodynamic collapse under anaesthesia.

Why Blood Pressure Matters During Spinal Surgery

Blood pressure is not merely a pre-operative safety parameter. It is a critical intraoperative variable throughout the procedure, with particular relevance for spinal cord safety.

As Dr. Sherief Elsayed has described in the context of spinal cord protection during surgery (covered in the preceding article in this series), maintaining adequate blood pressure throughout spinal cord procedures is essential because the spinal cord’s blood supply depends on perfusion pressure. A patient who enters the operating theatre already haemodynamically compromised has no reserve to withstand the further blood pressure reductions that anaesthesia, patient positioning, and surgical blood loss produce.

For routine lumbar disc or decompression procedures, the blood pressure requirements during surgery are less stringent than for cervical or thoracic cord procedures. But even in lower-risk spinal surgery, a patient who is septic or significantly hypovolaemic is at elevated risk of cardiac events, poor wound healing, and impaired post-operative recovery.

What Is Sepsis and Why Does It Contraindicate Elective Surgery?

Sepsis is a life-threatening systemic response to infection, in which the body’s immune response causes widespread physiological disruption, including cardiovascular instability, impaired organ perfusion, and a pro-coagulant state.

A septic patient typically presents with:

• Fever or hypothermia
• Rapid heart rate (tachycardia)
• Rapid breathing (tachypnoea)
• Low blood pressure despite adequate fluid resuscitation
• Altered mental state
• Evidence of organ dysfunction (elevated creatinine, abnormal liver enzymes, reduced urine output)

Operating on a septic patient for an elective procedure is contraindicated because:

• The cardiovascular system is already unstable and cannot reliably tolerate the additional physiological stress of surgery and anaesthesia
• Anaesthetic agents reduce blood pressure further in a patient who is already hypotensive
• Blood loss during surgery further depletes an already compromised blood volume
• Surgical wound healing requires adequate perfusion; sepsis impairs this
• Spinal surgery in particular carries risks of haematoma, wound dehiscence, and deep infection that are significantly increased in immunocompromised or haemodynamically unstable patients

The appropriate management of a septic patient is resuscitation with fluids and antibiotics, identification and treatment of the source of infection, and reassessment of surgical timing once haemodynamic stability is achieved. For certain emergency conditions (acute cauda equina syndrome, for example), surgery may need to proceed despite unfavourable physiological conditions because the neurological risk of delay outweighs the anaesthetic risk. But for elective spinal surgery, waiting for optimisation is always the right choice when the patient is septic.

What Is Hypovolaemia and How Does It Affect Surgical Safety?

Hypovolaemia means reduced circulating blood volume. It occurs when fluid losses exceed fluid intake, most commonly through:

• Bleeding (acute haemorrhage from trauma or from a gastrointestinal source)
• Severe vomiting or diarrhoea
• Inadequate fluid intake in the context of illness
• Burns

A significantly hypovolaemic patient has a reduced blood volume to distribute between all the body’s organs. Any patient developing illness before scheduled spinal surgery should contact their Pre-Surgery Spine Specialist in Dubai immediately. to distribute between all the body’s organs. Blood pressure is maintained initially through compensatory mechanisms including increased heart rate and peripheral vasoconstriction, but these mechanisms have limits. When anaesthesia removes vasoconstriction and the patient loses further blood volume during surgery, the result can be profound, sudden hypotension that is difficult to correct in the operating theatre.

“We would need to optimise everything before we were able to undertake any surgery” – this means fluid resuscitation to restore circulating volume, treatment of any underlying cause of the fluid loss, and reassessment of haemodynamic status before proceeding.

The Pre-Operative Assessment: Identifying Risk Before It Becomes an Emergency

The scenario described by Dr. Sherief Elsayed, where low blood pressure is identified on the day of surgery, illustrates why pre-operative assessment is not a bureaucratic formality but a clinical safety process.

The anaesthetic team’s pre-operative assessment is designed to identify patients at risk before they reach the operating table. Blood pressure, heart rate, clinical signs of dehydration or infection, and recent history of illness are all evaluated as part of this assessment.

For patients who are found to have pre-operative concerns, the surgical team will assess and advise on timing. Understanding what the pre-operative assessment covers is part of being well prepared, as explained in the article on how to get from diagnosis to the operating table, referenced by a Spinal Pre-Operative Doctor in Dubai.

• A new fever in the days before surgery
• Diarrhoea, vomiting, or reduced oral intake in the preceding 48 hours
• Active infection at any site, including dental infection, urinary tract infection, or a skin infection
• Significantly low blood pressure on arrival
• Any other acute illness that has developed since the pre-operative assessment

The surgical team should be informed promptly. Proceeding with an elective operation on a physiologically compromised patient is a safety risk that outweighs the inconvenience of rescheduling. A Spine Pre-Op Specialist in Dubai will ensure that all pre-operative parameters are optimised and that any concerns are communicated clearly before a spinal procedure begins.

Practical Guidance for Patients Preparing for Spinal Surgery in the UAE

Before your procedure:

• Take your usual blood pressure medications on the morning of surgery unless specifically instructed otherwise by your anaesthetic team
• Do not take diuretics or any medication that might lower blood pressure on the morning of surgery without explicit instruction
• Follow fasting instructions precisely to prevent dehydration from inadequate fluid intake
• Inform your surgical team if you develop any illness in the days before your procedure: fever, diarrhoea, vomiting, urinary symptoms, dental pain, or any new symptoms
• Inform your team of any known needle phobia or history of vasovagal episodes, so appropriate measures can be planned

On the day:

• If your blood pressure is measured and found to be low, cooperate with the team’s assessment and do not pressure them to proceed if they have clinical concerns
• Understand that a decision to delay surgery is a decision in your interest, not a system failure

Expert Summary

Low blood pressure on the day of surgery is not always a reason to delay. In a young, healthy patient with a vasovagal response to needle anxiety, it is a manageable, reversible physiological event that does not indicate underlying haemodynamic instability. Correcting it and proceeding is safe.

In a patient who is septic or significantly hypovolaemic, low blood pressure signals that the physiological reserve needed to safely tolerate surgery is absent. Proceeding without optimisation puts the patient at serious risk. The decision to delay, optimise, and reassess is not excessive caution but sound clinical judgement that prioritises long-term safety over short-term convenience.