Preoperative Cardiac Assessment: What Happens When Your Surgeon Asks for Cardiac Clearance

Why Your Surgeon Is Asking for Cardiac Clearance Before Surgery

You came in for a hip replacement, a hernia repair, or maybe a cancer operation — and now someone has told you that you need "cardiac clearance" before the surgery can move forward. This can feel alarming. You might wonder: Is something wrong with my heart? Is my surgery more dangerous than I thought?

In most cases, the answer is reassuring. A preoperative cardiac assessment is a structured evaluation designed to determine whether your heart can safely handle the stress of surgery and anesthesia. It does not necessarily mean anyone suspects you have a serious heart problem. It means your surgical team is being thorough — and that is a good thing.

But the process can also be confusing, time-consuming, and occasionally lead to delays or additional tests that may or may not be necessary. As a cardiac surgeon, I want to walk you through what this evaluation actually involves, what the guidelines say, and where patients sometimes fall through the cracks.

What a Preoperative Cardiac Assessment Actually Involves

The term "cardiac clearance" is used so casually in medicine that it has almost lost its meaning. Technically, the American College of Cardiology (ACC) and American Heart Association (AHA) discourage the phrase entirely, because it implies a binary pass/fail — when in reality, the assessment is about quantifying your cardiac risk before non-cardiac surgery and deciding whether that risk can be reduced.

Here is what typically happens during a preoperative cardiac evaluation:

Step 1: History and Physical Examination

A physician — often your primary care doctor, an internist, or a cardiologist — will review your medical history with particular attention to:

• Known heart disease (prior heart attack, heart failure, valve disease, arrhythmias)
• Symptoms that could suggest undiagnosed heart disease (chest pain, unexplained shortness of breath, dizziness, reduced exercise tolerance)
• Risk factors such as diabetes, kidney disease, high blood pressure, smoking history, and advanced age
• Prior cardiac testing and interventions

This step is the most important part of the entire process. According to the 2014 ACC/AHA Guidelines on Perioperative Cardiovascular Evaluation and Management, a careful history and physical exam can stratify the majority of patients without any additional testing at all.

Step 2: Functional Capacity Assessment

One of the single most useful pieces of information is your functional capacity — essentially, how active you are in daily life. Clinicians measure this in metabolic equivalents, or METs. If you can climb a flight of stairs, walk up a hill, do heavy housework, or engage in moderate recreational activity without cardiac symptoms, you likely have a functional capacity of 4 METs or greater. Studies consistently show that patients who meet this threshold have a low risk of major cardiac events during non-cardiac surgery, even if they have other risk factors.

If your functional capacity is poor or cannot be assessed — for example, if you use a wheelchair or have severe arthritis that limits your mobility — further testing may be warranted.

Step 3: Risk Stratification Tools

Your physician may use one of several validated tools to estimate your perioperative cardiac risk. The most commonly used is the Revised Cardiac Risk Index (RCRI), also called the Lee Index, which assigns points based on six factors: high-risk surgery type, history of ischemic heart disease, history of heart failure, history of cerebrovascular disease, insulin-dependent diabetes, and a creatinine level above 2.0 mg/dL. Each point increases your estimated risk of a major cardiac event.

The ACS NSQIP Surgical Risk Calculator is another tool that incorporates more patient-specific variables. If you are curious about risk assessment tools used in cardiac surgery itself, our free cardiac surgery risk calculator can help you understand how surgeons think about operative risk.

Step 4: Additional Testing (When Indicated)

This is where the process can go sideways. Not every patient needs an echocardiogram, a stress test, or a cardiac catheterization before non-cardiac surgery. The guidelines are explicit: testing should only be performed if the results will change management.

Common preoperative cardiac tests include:

• Electrocardiogram (ECG): A baseline ECG is reasonable for patients with known cardiovascular disease, significant risk factors, or those undergoing high-risk procedures. It is generally not necessary for low-risk patients having low-risk surgery.
• Echocardiogram: Indicated if there is clinical suspicion of significant valvular disease or undiagnosed heart failure — for instance, if a new heart murmur is heard or the patient has unexplained dyspnea. Routine echocardiography for all preoperative patients is not recommended.
• Stress testing: Reserved for patients with elevated cardiac risk and poor or unknown functional capacity who are undergoing elevated-risk surgery. A normal stress test is reassuring. An abnormal result may lead to further evaluation or a change in surgical planning.
• Coronary angiography (cardiac catheterization): Only indicated when the findings would lead to coronary revascularization independent of the planned non-cardiac surgery. In other words, the catheterization should not be performed solely to "clear" someone for a knee replacement. If you have questions about interpreting catheterization results, we have a detailed guide on coronary artery disease evaluation.

Where the Cardiac Clearance Process Goes Wrong

I see a recurring pattern in my practice. A patient is referred for cardiac clearance. A cascade of tests follows — sometimes driven more by medicolegal anxiety than clinical necessity. The stress test shows a borderline finding. A catheterization is performed. A coronary lesion is found. Suddenly the patient is being told they might need a stent or even bypass surgery — and the original operation that started all of this is now delayed by weeks or months.

This is not a hypothetical scenario. The CARP trial (Coronary Artery Revascularization Prophylaxis), published in the New England Journal of Medicine, demonstrated that prophylactic coronary revascularization before vascular surgery did not reduce the incidence of postoperative myocardial infarction or death compared to optimal medical management alone. This was a landmark finding, and it reshaped how we think about preoperative cardiac intervention.

The lesson for patients: more testing does not always mean better care. If you are being sent down a path of escalating cardiac workup before a non-cardiac procedure, it is entirely appropriate to ask your doctors two questions:

• Will the result of this test change what you do next?
• Could my surgery proceed safely with medical optimization instead?

These are not confrontational questions. They are the same questions that evidence-based guidelines expect clinicians to ask themselves.

Medical Optimization: The Often-Overlooked Step

For many patients, the most effective way to reduce cardiac risk before non-cardiac surgery is not a procedure — it is medical optimization. This means ensuring that your existing cardiac conditions are as well-controlled as possible before you go to the operating room.

Practical examples include:

• Beta-blockers: If you are already taking a beta-blocker, it should be continued through the perioperative period. The ACC/AHA guidelines advise against abruptly starting high-dose beta-blockers on the day of surgery, as this was associated with increased stroke risk in the POISE trial.
• Statins: Perioperative statin use has been associated with reduced cardiac events. If you are on a statin, continue it. If you have indications for one and are not yet taking it, your physician may start one before surgery.
• Blood pressure control: Uncontrolled hypertension — particularly with systolic pressures consistently above 180 mmHg — may warrant a brief delay to optimize medication, though mild-to-moderate hypertension is generally not a reason to cancel surgery.
• Heart failure management: If you have known heart failure, ensuring that you are on guideline-directed medical therapy and are euvolemic (not fluid-overloaded) is critical. Our article on heart failure medications and GDMT explains these therapies in detail.
• Anticoagulation management: If you are on blood thinners for atrial fibrillation, a mechanical heart valve, or a recent stent, the timing of stopping and restarting these medications requires careful coordination between your cardiologist, surgeon, and anesthesiologist.

When You Should Consider Getting a Second Opinion on Your Cardiac Risk

Most preoperative cardiac assessments are straightforward and lead to appropriate decisions. But there are situations where a second set of eyes — particularly from a cardiac surgeon — can make a real difference:

• You have been told you need cardiac surgery (CABG or valve surgery) before your planned non-cardiac procedure can happen. This is a major escalation that deserves independent review.
• Your non-cardiac surgery has been delayed repeatedly due to ongoing cardiac workup, and you are not sure the testing is necessary.
• You have complex cardiac history — prior bypass, multiple stents, moderate valve disease — and the recommendations you are receiving feel uncertain or conflicting.
• You have been told your cardiac risk is "too high" for surgery and want to understand whether that assessment is accurate or whether there are strategies to mitigate the risk.

In each of these scenarios, a cardiac surgery second opinion can provide clarity. At WhiteGloveMD, we review your complete records — imaging, catheterization data, echocardiograms, and clinical notes — and give you an independent, evidence-based assessment of your cardiac risk and the appropriateness of any recommended interventions.

The Bottom Line for Patients Facing Preoperative Cardiac Evaluation

A preoperative cardiac assessment exists to keep you safe. When done according to guidelines, it is efficient, targeted, and genuinely protective. The ACC/AHA framework is designed to identify the small number of patients who truly need intervention while allowing the majority to proceed to surgery with confidence.

But the system is imperfect. Unnecessary testing happens. Cascading referrals happen. Surgeries get delayed — sometimes appropriately, sometimes not. Your role as a patient is to understand the basics of the process, ask informed questions, and seek additional expertise when the path forward is unclear.

Here are the key takeaways:

• Cardiac clearance is about risk assessment, not a simple yes or no.
• Functional capacity — what you can physically do in daily life — is one of the strongest predictors of how your heart will tolerate surgery.
• Not every patient needs a stress test or echocardiogram. Testing should be driven by clinical findings, not routine protocol.
• Medical optimization (continuing or adjusting your cardiac medications) is often more important than additional procedures.
• If you are told you need cardiac surgery before another operation can happen, that recommendation deserves scrutiny.

If you are facing a preoperative cardiac evaluation that has raised more questions than answers — or if you have been told you need a cardiac intervention before your planned surgery can proceed — a WhiteGloveMD second opinion can help you understand your true risk and your real options. Our board-certified cardiac surgeon reviews your complete case and delivers a clear, independent assessment. Start your review today.