How Doctors in Los Angeles, CA Determine the Need for a Heart Rhythm Device

Not every heart rhythm problem calls for a device. Some arrhythmias respond well to medication alone. Others point toward a pacemaker, an implantable cardioverter-defibrillator (ICD), or a cardiac resynchronization therapy (CRT) device as the most appropriate treatment. That decision rests on a specific set of clinical findings, not a general rule.

At the Cardiac Electrophysiology Institute (CEPI), our top-rated electrophysiologist in Los Angeles evaluates each patient individually before recommending any device. Here’s how that process works and what leads a physician to recommend one type of device over another.

What Is a Heart Rhythm Device?

A heart rhythm device is an implanted piece of medical hardware designed to monitor the heart’s electrical activity and respond when something goes wrong. Different devices are built for different problems.

A pacemaker monitors heart rate and delivers small electrical pulses when the heart beats too slowly. An ICD does the same but also delivers a shock when it detects a life-threatening fast rhythm. A CRT device, used in patients with heart failure and conduction delays, coordinates the timing of the heart’s contractions to improve pumping efficiency. A Watchman device closes off a small pouch in the upper left chamber of the heart to reduce stroke risk in patients with atrial fibrillation (AFib) who cannot safely take blood thinners long-term. An implantable loop recorder (ILR) is a diagnostic device placed under the skin to continuously monitor heart rhythm for up to three years.

Each of these serves a different clinical purpose, and each is recommended based on different findings.

Which Symptoms Prompt a Heart Rhythm Device Evaluation?

The evaluation process usually begins with a symptom. Patients come to us after a fainting episode, repeated palpitations, a wearable device alert, or a referral from their cardiologist following an abnormal EKG or stress test.

Fainting, or syncope, is one of the more common reasons patients are referred for a device evaluation. When the cause of fainting is not clear after a basic workup, extended heart rhythm monitoring and, in some cases, an electrophysiology (EP) study may point toward a slow or fast rhythm that is causing the brain to lose blood flow temporarily.

Symptoms like shortness of breath during mild exertion, chronic fatigue, or lightheadedness, particularly in a patient with a known heart condition, may also prompt evaluation. These can signal that the heart’s electrical system is not coordinating effectively, which is the clinical scenario where CRT becomes relevant.

What Diagnostic Tests Are Used Before Recommending a Device?

We do not recommend a device based on symptoms alone. A thorough evaluation includes several layers of testing, and the sequence depends on how often symptoms occur and what prior testing has already captured.

The first step is a standard EKG, which records the heart’s electrical activity in real time. If an arrhythmia is present during the recording, it is captured there. If the patient is in normal rhythm at the time of the EKG, the result may appear normal even if the patient experiences frequent arrhythmia episodes between visits.

That is where extended monitoring comes in. A Holter monitor records continuously for 24 to 48 hours. A patch monitor extends that window to 14 to 30 days. When symptoms occur only a few times per year, an implantable loop recorder placed under the skin can record for up to three years, making it possible to capture an event that would never appear on a short-term monitor.

An echocardiogram provides a view of the heart’s structure including chamber size, wall motion, and ejection fraction. A reduced ejection fraction, particularly below 35%, is a key data point in ICD and CRT decision-making.

An EP study records electrical signals from inside the heart chambers directly. It maps how electrical signals travel through the conduction system, identifies where abnormal signals originate, and tests how the heart responds to controlled stimulation. When the EP study induces a dangerous arrhythmia in a controlled setting, that finding can confirm the need for an ICD.

How Do Doctors Decide Between a Pacemaker and an ICD?

The distinction comes down to what the heart needs protection from, and the answer is grounded in the type of arrhythmia identified during the evaluation.

A pacemaker treats rhythms that are too slow. Bradycardia, which is a consistently low heart rate, and heart block, which is a disruption in the signal traveling from the upper to lower chambers, are the conditions most commonly treated with a pacemaker. The device detects a drop in heart rate and delivers a correcting pulse before the patient becomes symptomatic.

An ICD is for patients whose primary risk is a dangerously fast rhythm. Ventricular tachycardia (VT) and ventricular fibrillation are the rhythms most associated with sudden cardiac arrest. Patients who have survived a cardiac arrest, or who have structural heart disease that puts them at elevated risk, are typically evaluated for an ICD.

Some patients need both pacing and defibrillation. Modern combination devices provide pacing for slow rhythms while also carrying the ability to deliver a shock if a life-threatening fast rhythm is detected.

What Role Does an Electrophysiologist Play in This Decision?

A general cardiologist can identify many rhythm problems and recommend a device evaluation. The actual device selection, implantation, and ongoing management require an electrophysiologist, a cardiologist who has completed additional fellowship training specifically in the heart’s electrical system and rhythm device procedures.

Our practice is led by Dr. Arshia M. Noori, MD, FACC, FHRS, who holds triple board certification from the American Board of Internal Medicine (ABIM) in Clinical Cardiac Electrophysiology, Cardiovascular Disease, and Internal Medicine. That third certification in Internal Medicine matters for patients managing complex medical histories alongside their rhythm disorder, including diabetes, kidney disease, or heart failure, all of which affect device selection and anticoagulation decisions.

We perform procedures including pacemaker implantation and ICD implantation, ranked the number one cardiology program in California and the Western United States, and number two nationally, according to U.S. News and World Report.

Frequently Asked Questions

These are some of the most common questions patients ask when they are first learning that a heart rhythm device may be needed.

Q: Can a general cardiologist implant a pacemaker or ICD? A: Device implantation requires subspecialty training in cardiac electrophysiology. While a general cardiologist may manage a patient’s rhythm disorder with medication, the implantation and ongoing programming of pacemakers and ICDs fall within the scope of an electrophysiologist.

Q: What is the difference between a pacemaker and an ICD? A: A pacemaker monitors heart rate and delivers a small electrical pulse when the heart beats too slowly. An ICD monitors for life-threatening fast rhythms and delivers a corrective shock to terminate them. Some devices combine both functions.

Q: Do I need a referral to see an electrophysiologist in Los Angeles? A: No. Patients can contact us directly without a physician referral. Referrals from cardiologists and primary care physicians are welcome but not required.

Q: How long does the device evaluation process take? A: The timeline depends on how often symptoms occur and how much prior testing has already been completed. Some patients are ready for a recommendation after a first consultation and echocardiogram. Others need extended monitoring over several weeks or months before the picture is clear.

Q: What happens during an EP study? A: An EP study is a procedure where thin catheters are guided through blood vessels into the heart to record electrical signals from inside the chambers. It maps the heart’s conduction system, identifies the source of an arrhythmia, and in some cases allows the arrhythmia to be treated in the same session. Patients are sedated throughout.

Q: Is device implantation considered surgery? A: Not in the traditional sense. Device implantation does not require opening the chest. A small incision is made below the collarbone, the generator is placed under the skin, and leads are threaded through a blood vessel into the heart using imaging guidance. Most patients go home the same day or after one overnight stay.

Q: What is an implantable loop recorder and when is it used? A: An implantable loop recorder (ILR) is a small device placed just under the skin in the chest that continuously monitors heart rhythm for up to three years. It is used when symptoms such as fainting occur so infrequently that a standard Holter or patch monitor is unlikely to capture an episode.

Schedule a Heart Rhythm Evaluation in Los Angeles

If you have experienced fainting, repeated palpitations, a wearable device alert, or were told by your cardiologist that a device evaluation may be appropriate, we are ready to take the next step with you.

New patients are welcome. No referral is required.

Contact Us

At CEPI, we’re always here to assist you. Whether you have questions about our services, need to schedule an appointment, or would like to learn more about cardiac electrophysiology, our team is here to help.

Office Location: 8631 West 3rd Street #710E, Los Angeles, CA 90048
Phone: (310) 746-5335
Office Hours:

• Monday to Friday: 8:00 AM–5:00 PM

Get in touch today! Prefer to reach out online? Fill out our contact form, and a member of our team will get back to you promptly.

 

Related Topics:

• The Role of Cardiologists vs. Electrophysiologists in Managing Heart Arrhythmias
• Comparing Different Heart Rhythm Devices: Pacemakers, Leadless Pacemakers, and Loop Recorders

 

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