A patient sat across from me last month, surgery date already on the calendar, and slid a form across the desk. Her surgeon wanted "cardiac clearance." She was convinced this meant something was wrong with her heart. It didn't. She just needed a quick heart tracing and someone to read it carefully.
That tracing is a pre-op EKG, and it's one of the most common things I do before a patient heads into the operating room here in Los Angeles. Let me walk you through what it actually checks, why your surgical team asks for it, and what happens if something looks a little off.
What is a pre-op EKG and why does my surgeon want one?
A pre-op EKG is a short recording of your heart's electrical activity, done before surgery so we can spot anything that might raise your risk under anesthesia. Surgeons and anesthesiologists want a baseline. They're not hunting for trouble so much as making sure your heart can handle the stress of an operation and the medications that come with it.
The test itself is painless. We place a handful of sticky electrodes on your chest, arms, and legs, you lie still for a few seconds, and the machine prints out a series of squiggles. The whole thing takes longer to set up than to run. No needles, no dye, nothing to swallow.
What matters is the interpretation. A 12-lead EKG can hint at an old silent heart attack, an irregular rhythm like atrial fibrillation, a thickened heart muscle, or electrolyte issues. Reading it in the context of your history is the real work, and it's part of a broader pre-operative risk assessment rather than a standalone verdict.
Do I really need an EKG before every surgery?
No. Not everyone needs one, and a good clinician won't order tests reflexively. The decision depends on your age, your heart history, the type of surgery, and whether you have symptoms.
I tend to think harder about a pre-op EKG when someone has:
- Known heart disease or a prior heart attack
- High blood pressure, diabetes, or a strong family history
- Symptoms like chest pressure, breathlessness, or fainting spells
- A bigger operation planned, rather than a minor outpatient procedure
A healthy thirty-year-old having a quick skin procedure usually doesn't need one. Your surgical team and I sort this out together, and I'd rather skip an unnecessary test than chase a finding that doesn't change anything.
What does an abnormal pre-op EKG actually mean?
An abnormal EKG rarely means surgery is off the table. More often it means we pause, ask a few more questions, and sometimes order one additional test. The tracing is a snapshot, not the whole story.
Some "abnormal" patterns are completely benign and have been there for years. Others, like a new irregular rhythm or signs of strain, deserve a closer look before you go under. If your blood pressure has been running high, this is also a natural moment to revisit it, since uncontrolled hypertension matters both during and after surgery.
When I do find something worth pursuing, I coordinate directly with your surgeon and, when needed, a cardiologist. Because I'm credentialed at Cedars-Sinai, I can usually get that conversation moving quickly so your surgery date doesn't slip more than it has to.
How should I prepare for my pre-op EKG?
There's almost nothing to prepare. Take your usual medications unless I tell you otherwise, and bring a current list so we have it on hand. Wearing a two-piece outfit makes the electrodes easier to place.
Caffeine and a rushed, anxious drive can nudge your heart rate up, so I like patients to sit for a few minutes and settle before we record. If you smoke, mention it. And if you've felt any chest discomfort or palpitations recently, tell me before the test, not after. That detail often changes how I read the result.
This visit is also a good chance to tidy up the rest of your clearance, from your medication list to whether you're due for any routine labs. Thinking about your heart before surgery is really just one piece of longer-term cardiovascular disease prevention, and I treat it that way.
The short version
A pre-op EKG is a quick, comfortable test that gives your surgical team confidence and gives me a clear picture of your heart before the big day. Most results are reassuring. The few that aren't usually lead to a small, manageable next step, not a canceled surgery.
If you have surgery coming up and you're staring at a clearance form wondering where to start, I'm happy to help you sort it out without the runaround. Reach out through my contact page and we'll get your heart checked, your questions answered, and your surgery on track.