Do You Need Cardiac Clearance Before Surgery? What Every Patient Should Know

Do You Need Cardiac Clearance Before Surgery? What Every Patient Should Know

You’re scheduled for a knee replacement, a hernia repair, or another operation, and your surgeon says you need cardiac clearance first. What does that mean? Will you need a stress test? Should you stop your blood thinner? And could it delay your surgery?

About 300 million noncardiac surgeries are performed worldwide each year, and heart complications are among the most serious risks. A careful preoperative heart evaluation helps you get through surgery safely. Here’s what to expect, based on the 2024 ACC/AHA guideline for heart care around noncardiac surgery.

What "Cardiac Clearance" Really Means

“Cardiac clearance” is a common phrase, but it can be misleading. No cardiologist can guarantee that surgery will be risk-free. What a cardiologist actually provides is a preoperative cardiac risk assessment (CRA):

  • Estimating your risk of a heart attack, heart rhythm problem or other heart complication during or after surgery
  • Identifying heart conditions that need attention before surgery, such as unstable chest pain, uncontrolled heart failure, or a severely narrowed heart valve
  • Optimizing your medications, including blood thinners, blood pressure medicines, and diabetes drugs
  • Communicating with your surgeon and anesthesiologist so your whole team has a clear plan
The goal isn’t just to sign a form. It’s to make sure you’re as safe as possible before, during, and after surgery.

Who Needs a Cardiac Evaluation Before Surgery?

Not everyone needs to see a cardiologist before surgery. You’re more likely to need an evaluation if you have:

  • Known heart disease, such as a prior heart attack, stent, bypass surgery, or heart failure
  • A heart valve problem, such as aortic stenosis
  • An irregular heart rhythm, a pacemaker, or a defibrillator
  • New or worsening symptoms, such as chest pain, shortness of breath, palpitations, or fainting
  • Several risk factors, such as diabetes, high blood pressure, kidney disease, smoking, or a history of stroke
  • Older age, generally over 55 for men and over 65 for women, combined with other risk factors

If you have any symptoms that concern you, don’t wait for surgery to get them checked. See our 10 warning signs you should see a cardiologist.

How Your Surgical Heart Risk Is Assessed

Your cardiologist looks at three main things:

1. How risky the surgery is. Cataract surgery, skin procedures, and many endoscopies are low risk for the heart. Major abdominal, chest, vascular, and some orthopedic surgeries carry more risk because they involve more blood loss, fluid shifts, and stress on the body.

2. Your personal risk factors. Cardiologists use validated tools, such as the Revised Cardiac Risk Index (RCRI) or the American College of Surgeons NSQIP risk calculator, to estimate your risk based on your health history and the type of surgery.

3. Your functional capacity. This is one of the most useful measures. If you can climb two flights of stairs or walk briskly up a hill without chest pain or significant shortness of breath, your heart is usually strong enough to handle most surgeries. Doctors call this an activity level of at least 4 METs (metabolic equivalents). A short questionnaire called the Duke Activity Status Index (DASI) can also measure it.

If your surgery is low risk, or if you have good functional capacity, you usually don’t need additional heart testing and can proceed with surgery.

What to Expect at Your Cardiac Clearance Visit

A preoperative cardiology visit usually includes:

  • A review of your symptoms, medical history, and medications
  • A physical exam, including listening for heart murmurs and checking for fluid buildup
  • An electrocardiogram (ECG) for most patients
  • Blood work when needed
  • A plan for your medications before and after surgery
  • A letter or note to your surgeon summarizing your risk and recommendations

Will I Need a Stress Test or Echocardiogram

Probably not. Many patients expect a battery of heart tests before surgery, but current guidelines recommend testing only when the results would change your care.

Under the 2024 guideline, routine stress testing is not recommended for patients at low risk, those with good functional capacity, or those having low-risk procedures. Testing may be considered for selected patients who have both elevated risk and poor or unknown functional capacity.

An echocardiogram, an ultrasound of the heart, may be recommended if you have a heart murmur that hasn’t been evaluated, symptoms of heart failure, or a known valve problem or weak heart muscle with a change in symptoms. Unnecessary testing can delay surgery and sometimes lead to more procedures without improving safety.

Medications: What to Stop and What to Keep Taking

Never stop a heart medication on your own. Your cardiologist and surgeon will give you specific instructions. In general:

  • Blood thinners (anticoagulants): Most people taking apixaban, rivaroxaban, dabigatran, edoxaban, or warfarin can safely pause them for a few days before surgery and restart afterward. “Bridging” with heparin injections usually isn’t needed and can increase bleeding. It’s reserved for people at very high risk of clots, such as those with a mechanical mitral valve.
  • Antiplatelet medications after a stent: Aspirin is usually continued. Stopping clopidogrel, prasugrel, or ticagrelor too soon after a stent can cause a dangerous clot inside the stent, so never stop these without talking to your cardiologist.
  • SGLT2 inhibitors (such as empagliflozin, dapagliflozin, and canagliflozin): The 2024 guideline recommends stopping these 3 to 4 days before surgery to lower the risk of a serious complication called ketoacidosis.
  • GLP-1 medications (such as semaglutide and tirzepatide): These slow stomach emptying, which can raise the risk of aspiration during anesthesia. Your surgical and anesthesia team will tell you whether and when to hold them.
  • Beta-blockers and statins: If you already take them, they’re usually continued through surgery. Starting a beta-blocker just before surgery isn’t recommended.
  • Blood pressure medications: Some, such as ACE inhibitors or ARBs, may be held the morning of surgery. Follow your team’s instructions.

Have questions about your statin? Read our post on statin myths and facts.

Surgery After a Heart Attack or Stent: How Long Should You Wait?

Timing matters if you’ve recently had a heart attack or a stent:

  • After a heart attack: Elective surgery is generally delayed for at least 60 days.
  • After a stent: Elective surgery is usually delayed for several months, often 6 months or longer, so that blood thinners protecting the stent aren’t stopped too early. The exact timing depends on the type of stent and why it was placed.
  • Urgent or emergency surgery shouldn’t be delayed. Your cardiologist and surgeon will work together to manage blood thinners and monitor your heart.

Learn more about stents in our post on the benefits of minimally invasive heart treatment.

Your Preoperative Cardiac Checklist

Bring these to your appointment to avoid delays:

  • A complete list of your medications and doses, including supplements
  • The type and date of your planned surgery, and your surgeon’s name and fax number
  • Any surgical clearance form your surgeon’s office provided
  • Recent test results, such as ECGs, echocardiograms, stress tests, or heart catheterization reports
  • Information about any stents, pacemakers or defibrillators, including your device card
  • A list of any new or worsening symptoms
Schedule early. Book your cardiac evaluation at least 2 to 4 weeks before surgery so there’s time for any needed tests or medication changes.

Frequently Asked Questions

How long does cardiac clearance take? Many patients can be evaluated in a single visit. If testing is needed, it may take one to two weeks. Scheduling your evaluation 2 to 4 weeks before surgery helps avoid delays.

Can a cardiologist refuse to clear me for surgery? A cardiologist doesn’t approve or deny surgery. Instead, they assess your risk and may recommend treating a heart problem first, such as unstable chest pain, uncontrolled heart failure, or a severely narrowed valve. In those cases, getting your heart condition under control first can make surgery much safer.

Do I need cardiac clearance for a colonoscopy or cataract surgery? Usually not. These are low-risk procedures for the heart. However, if you take blood thinners or have new heart symptoms, talk with your doctor beforehand.

Is cardiac clearance covered by insurance? Preoperative cardiac evaluations are generally covered by Medicare and most insurance plans when they’re medically necessary. Check with your plan about copays and whether a referral is required.

What happens if I have heart problems after surgery? About 1 in 5 patients having noncardiac surgery develops a small amount of heart muscle injury afterward, often without symptoms, according to the American Heart Association. New heart problems after surgery, such as atrial fibrillation or heart muscle injury, should be followed up with a cardiologist after you’re discharged.

Preoperative Cardiac Evaluations in Tampa

At Ascent Cardiology, we provide timely preoperative cardiac evaluations for patients across Tampa Bay. We review your history, perform only the testing you need, including in-office ECG, echocardiography, and stress testing and communicate directly with your surgeon and anesthesiologist so your surgery can proceed safely and on schedule.

We also see patients for follow-up after surgery if new heart concerns arise.

Request an appointment or call (813) 540-4322. Surgeons’ offices: fax preoperative referrals to (813) 540-7262.

602 S Audubon Ave, Suite A, Tampa, FL 33609

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