Preoperative Cardiac Assessment: What Happens During Cardiac Clearance Before Surgery

Why Your Surgeon Wants Cardiac Clearance Before Surgery

You have been told you need a hip replacement, or a colon resection, or perhaps a major vascular procedure. Your surgeon seems confident about the operation itself. But before anything can move forward, someone says: We need cardiac clearance first.

This phrase can feel unsettling. You may wonder whether something is wrong with your heart that no one has mentioned. In most cases, the answer is no. A preoperative cardiac assessment is not an alarm — it is a routine but critically important process designed to understand how your heart will handle the stress of anesthesia and surgery.

As a cardiac surgeon, I see patients at every stage of this evaluation. Some are referred to me after testing reveals a problem that needs to be addressed before their planned procedure. Others simply need reassurance and a clear plan. In either case, the goal is the same: to make surgery as safe as possible for you.

Here is what you should know about the process, what the tests mean, and when you should consider asking for a second opinion.

What a Preoperative Cardiac Assessment Actually Involves

The term "cardiac clearance for surgery" is used casually, but the actual process follows a structured set of guidelines developed by the American College of Cardiology (ACC) and American Heart Association (AHA). The most recent update of these guidelines provides a stepwise approach to evaluating cardiac risk before non-cardiac surgery.

The process typically begins with your primary care physician or the consulting cardiologist reviewing several key factors:

• Your cardiac history: Prior heart attacks, heart failure, valve disease, arrhythmias, prior cardiac procedures or surgeries, and any history of coronary artery disease.
• Your functional capacity: Can you climb a flight of stairs without stopping? Can you walk briskly for a block or two? If you can perform activities at or above four metabolic equivalents (METs) — roughly the effort of climbing a flight of stairs or walking up a hill — your cardiac risk is generally lower.
• The type of surgery you are having: Not all operations carry the same cardiac risk. Low-risk procedures (such as cataract surgery or minor skin procedures) rarely require any cardiac workup. Elevated-risk surgeries — including most intra-abdominal, intrathoracic, major orthopedic, and vascular operations — carry a higher likelihood of cardiac complications and warrant closer evaluation.
• Your existing risk factors: Diabetes, kidney disease, cerebrovascular disease, and advanced age all contribute to your overall risk profile.

Based on these factors, your physician may determine that no further testing is needed — that is a legitimate and evidence-based outcome. Or they may recommend additional studies.

Common Tests You May Undergo

If your physician determines that further evaluation is warranted, the following tests are most commonly ordered:

• Electrocardiogram (ECG): A baseline recording of your heart's electrical activity. This is quick, painless, and often the first test obtained.
• Echocardiogram: An ultrasound of your heart that evaluates how well your heart muscle is pumping (ejection fraction), the condition of your heart valves, and whether there are any structural abnormalities. If you have a known heart murmur or a history of heart failure, this test is particularly important.
• Stress testing: This may be an exercise stress test (walking on a treadmill) or a pharmacologic stress test (using medication to simulate exercise if you cannot walk). Stress tests help identify whether your heart muscle is getting adequate blood flow under exertion. A nuclear stress test or stress echocardiogram adds imaging to improve diagnostic accuracy.
• Coronary angiography (cardiac catheterization): This is not routine for preoperative assessment and is reserved for cases where stress testing reveals significant abnormalities or when your clinical picture strongly suggests obstructive coronary artery disease that could pose a danger during surgery.

One important point: more testing does not always mean better care. The ACC/AHA guidelines specifically caution against excessive preoperative cardiac testing when it is unlikely to change management. If you have good functional capacity and no active cardiac symptoms, a battery of tests may introduce unnecessary delays, costs, and even false-positive results that lead to procedures you do not need.

Understanding Your Cardiac Risk Before Non-Cardiac Surgery

Risk is not a single number. It is a composite picture built from your medical history, your physical condition, and the demands of the planned operation. Several validated tools exist to help quantify this risk.

The Revised Cardiac Risk Index (RCRI), also known as the Lee Index, is one of the most widely used. It assigns points based on six independent predictors of major cardiac complications: high-risk surgery, history of ischemic heart disease, history of heart failure, history of cerebrovascular disease, insulin-dependent diabetes, and preoperative serum creatinine above 2.0 mg/dL. A score of zero predicts a very low risk of major cardiac events (well under 1%), while a score of three or more pushes that risk above 5-6%.

The ACS NSQIP Surgical Risk Calculator is another tool that estimates the probability of various complications — including cardiac events — based on a broader set of patient and procedural factors.

You can get a sense of your own surgical risk profile using our free cardiac surgery risk calculator. While no calculator replaces a thorough clinical evaluation, understanding your baseline risk helps you have more informed conversations with your surgical team.

What Happens When a Problem Is Found

Sometimes the preoperative cardiac assessment reveals a previously undiagnosed condition — a tight aortic valve, significant coronary artery blockages, or a weakened heart muscle. This is not uncommon, particularly in older patients or those with multiple risk factors.

When this happens, the question becomes: Does this cardiac problem need to be addressed before the planned surgery, or can the non-cardiac surgery proceed with modifications to the anesthetic and perioperative plan?

The answer depends on the severity of the cardiac condition and the urgency of the planned operation. For example:

• Severe aortic stenosis discovered before an elective knee replacement will typically need to be addressed first — either through surgical aortic valve replacement or a transcatheter procedure — because the risk of proceeding with untreated severe aortic stenosis is substantial.
• Moderate coronary artery disease in a patient undergoing a semi-urgent cancer resection may be managed with optimized medical therapy (beta-blockers, statins, aspirin) and careful anesthetic management rather than preoperative coronary intervention. Studies, including the landmark CARP trial, have shown that prophylactic coronary revascularization before non-cardiac surgery does not improve outcomes in most stable patients.
• A mildly reduced ejection fraction may require medication optimization and closer hemodynamic monitoring during surgery but does not necessarily mean the operation cannot proceed.

These are nuanced decisions. They require coordination between your surgeon, your cardiologist, and your anesthesiologist. And they are exactly the kind of decisions where a second set of expert eyes can be invaluable.

When to Seek a Second Opinion on Your Cardiac Evaluation

Not every preoperative cardiac assessment generates controversy. Many are straightforward. But there are specific situations where I strongly encourage patients to seek an independent review:

• You have been told you need a cardiac procedure before your planned surgery, but you are not sure it is necessary. This is common with recommendations for preoperative stenting or valve intervention. These procedures carry their own risks and may not always be required.
• You have been "cleared" despite having significant symptoms. If you are experiencing chest pain, severe shortness of breath on exertion, or episodes of near-syncope, and your cardiologist has still provided clearance, it is reasonable to question whether the evaluation was thorough enough.
• Your surgery has been cancelled or indefinitely postponed due to cardiac risk. Sometimes this is the right call. Other times, a different team with more experience managing high-risk surgical patients might offer a path forward.
• You are managing multiple opinions that conflict with each other. When your cardiologist says one thing and your surgeon says another, an independent cardiac surgical opinion can help clarify the right approach.

Getting a cardiac second opinion is not a sign of distrust toward your doctors. It is a responsible step in a process that can meaningfully affect your safety and your outcome. Our team at WhiteGloveMD reviews your complete records — imaging, test results, operative notes, clinic letters — and provides an independent, evidence-based assessment within days, not weeks.

How to Prepare for Your Preoperative Cardiac Assessment

There are practical steps you can take to make this process more efficient and more useful:

• Bring a complete medication list. Include dosages, supplements, and over-the-counter medications. Certain drugs (beta-blockers, anticoagulants, antiplatelet agents) directly affect your cardiac risk profile and perioperative planning.
• Know your surgical details. Bring documentation of what procedure is planned, whether it is open or minimally invasive, and its approximate duration. Your cardiologist needs this information to accurately assess risk.
• Be honest about your activity level. If you cannot walk a block without stopping, say so. Overstating your functional capacity can lead to an underestimation of your risk.
• Ask specific questions. "What is my estimated risk of a cardiac complication?" "Are there any medications I should start or adjust before surgery?" "Do I need further testing, and if so, why?" These are fair and important questions.
• Request copies of all test results. You are entitled to your own medical records. Having your ECG, echocardiogram report, and stress test results readily available is essential if you want to seek a second opinion or if you are being seen by multiple providers.

You can learn more about how our review process works and what records to gather at our how it works page.

The Bottom Line: Cardiac Clearance Is About Making Surgery Safer

A preoperative cardiac assessment is not a bureaucratic hurdle. It is a clinical evaluation designed to identify risks that can be mitigated, conditions that need treatment, and strategies that can protect your heart during and after surgery. When done well, it saves lives. When done hastily or excessively, it can lead to unnecessary delays, unwarranted procedures, or false reassurance.

You deserve to understand your cardiac risk clearly, to know why specific tests are being ordered, and to feel confident that the plan is right for you.

If you are facing a preoperative cardiac assessment and want clarity about your risk, the necessity of recommended cardiac testing or procedures, or conflicting advice from your medical team, a WhiteGloveMD second opinion can help. Our team provides expert, independent cardiac surgical reviews — built around your records, your questions, and your goals. Start your review today.