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What explains an EKG with a fluctuating heart rate?

This Premium Q&A, reviewed and published, features a real conversation between an iCliniq user and a physician.

Patient's Query

Hello doctor,

Can my EKG be overread, please? My general practitioner read mine, and I would feel better if a cardiologist looked at it. I have a lot of fluctuations in heart rate, shortness of breath, chest tightness, fatigue, and dizziness. Labs show a positive D-dimer, elevated SED rate, elevated platelets, Vitamin B12, folate, and vitamin D deficiency. Ruled out a clot in the lungs with a CT scan, no signs of fluid in the lungs, no mono, and negative for COVID-19. Waiting for Holter monitor results. I started treatment for vitamin deficiencies.

Kinldy guide.

Hello,

Welcome to icliniq.com.

I can understand your concern.

Your ECG (electrocardiography) is normal. (attachment removed to protect patient identity). I think you are talking about a slight variation in heart rate in this ECG strip. Yes, it is there, and it is called sinus arrhythmia. Sinus arrhythmia is a perfectly normal arrhythmia. It is one of the only two rhythm problems that are called good arrhythmias. Do not worry about this. This sinus arrhythmia means your heartbeats are perfect. If you are talking about some other type of heart rate variation, Holter will clarify it. If there is any rhythm problem you feel concerned about, you can ask anytime. Positive D dimer is very nonspecific, and a diagnosis cannot be made on it alone. Keep taking Folate, vitamin B12, and D supplements.

I hope this helps.

Thank you.

Medically reviewed byDr. Vinodhini J.

Published At May 1, 2020
Reviewed AtFebruary 24, 2026

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