Palpitations After Cancer Treatment: A Heart Rhythm Questions Checklist

How cancer survivors can prepare for evaluation of palpitations and discuss symptom patterns, ECGs and ambulatory rhythm monitoring.

Quick answer

Palpitations describe the sensation of a rapid, skipped, pounding or irregular heartbeat. Many causes are possible, including benign rhythm changes, medication effects, anemia, thyroid disorders and clinically important arrhythmias. People who have received cancer therapy should share their treatment history when discussing new cardiovascular symptoms.

Describe the experience accurately

Note when episodes began, how long they last, whether they start or stop abruptly, and whether a regular or irregular pulse is felt. Record associated dizziness, weakness, shortness of breath, chest discomfort, or near fainting. Symptoms that arise with exercise or persist over time warrant particular attention.

Bring a cancer treatment summary

Include the cancer diagnosis and date, prior anthracyclines, HER2 directed therapies, immunotherapies, chest radiation, ongoing medications, and any previous echocardiograms or ECGs when available. This history helps the care team consider both cardiac and noncardiac possibilities without assuming a cause.

What tests might be considered?

A clinician may consider an ECG, selected blood tests, ambulatory rhythm monitoring, or cardiac imaging based on symptoms and findings. Wearable rhythm recordings may be helpful context, but their interpretation and diagnostic limitations should be discussed. The duration of rhythm monitoring is chosen according to the episode frequency and clinical situation.

FAQ: Does a normal ECG rule out an intermittent rhythm problem?

A resting ECG records a short period and may miss intermittent events. Symptom frequency and associated warning signs can guide the decision about longer monitoring or further evaluation.

When is urgent attention appropriate?

Palpitations accompanied by fainting, chest pressure, significant breathing difficulty, or concerning neurologic symptoms call for urgent or emergency assessment. A routine virtual appointment is most appropriate for stable symptoms after triage.

Discuss your next step

A clinician can determine whether a virtual review is appropriate and what records would assist. The My Heart Spark site lists a 45 minute Long Cardiology Visit ($150) for more detailed evaluations, subject to approval and state eligibility. https://myheartspark.clientsecure.me/request/service

Background source

American Heart Association, palpitations and evaluation: https://www.heart.org/en/news/2026/02/09/how-serious-are-heart-palpitations-causes-symptoms-and-when-to-worry