Post-Blood Donation Concerns: Rapid Heart Rate and Hypertrophic Cardiomyopathy

After donating 500cc of blood (I have a myocardial hypertrophy of 1.9 cm), my heart rate has been consistently fast, and I even feel dizzy?

After donating 500cc of blood (with a pre-existing condition of myocardial hypertrophy measuring 1.9 cm), I was informed that my heart failure index reached 1000.
My red blood cell count is normal at 21 (normal range is 14-18).
Since returning, my heart rate has been consistently high, around 100 beats per minute.
Is this dangerous? Thank you, doctor, for your help; I am very grateful! I am quite anxious and unsure of what to do.
Thank you, doctor.

A Zhi, 40~49 year old female. Ask Date: 2021/12/03

Dr. Li Han reply Cardiology

Hello, regarding your question about "hypertrophic cardiomyopathy and polycythemia"? Before the phlebotomy of 500cc, it was indicated that "the heart failure index reached 1000." Currently, your heart rate has been consistently high, around 100 beats per minute.
Is this dangerous? Both hypertrophic cardiomyopathy and polycythemia carry a higher risk even during asymptomatic periods, especially considering the elevated index you mentioned.
I believe your concerns are not suitable for online inquiries and should be addressed directly with a specialist.
Heart failure is a syndrome that requires a comprehensive assessment of both subjective and objective factors to formulate a treatment plan.
The Changhua Hospital of the Ministry of Health and Welfare cares about your well-being.

Reply Date: 2021/12/03

More Info

After donating blood, it is not uncommon to experience some physiological changes, including an increased heart rate. In your case, with a history of hypertrophic cardiomyopathy (HCM) and a significant heart wall thickness of 1.9 cm, it is essential to monitor your symptoms closely.
Hypertrophic cardiomyopathy is a condition characterized by the thickening of the heart muscle, which can lead to various complications, including arrhythmias, heart failure, and even sudden cardiac death in some cases. The heart's ability to pump blood efficiently can be compromised, especially during times of physiological stress, such as after blood donation.

When you donate blood, you are removing a significant volume of blood (in your case, 500 cc), which can lead to a temporary decrease in blood volume and, consequently, a drop in blood pressure. The body compensates for this by increasing the heart rate to maintain adequate blood flow to vital organs. A heart rate of around 100 beats per minute post-donation can be a normal compensatory response, especially if you are feeling well otherwise and do not have any symptoms like chest pain, dizziness, or shortness of breath.

However, given your underlying condition of hypertrophic cardiomyopathy, it is crucial to be vigilant. Here are some considerations and recommendations:
1. Hydration: Ensure you are well-hydrated after your donation. Dehydration can exacerbate symptoms and lead to further increases in heart rate. Drink plenty of fluids, preferably water or electrolyte solutions.

2. Rest: Take it easy for the remainder of the day. Avoid strenuous activities or heavy lifting, as your body needs time to adjust to the blood volume change.

3. Monitor Symptoms: Keep an eye on any new or worsening symptoms. If you experience chest pain, severe shortness of breath, fainting, or palpitations that feel different from your usual symptoms, seek medical attention immediately.

4. Follow-Up: Given your history of hypertrophic cardiomyopathy and the recent blood donation, it would be prudent to follow up with your cardiologist. They may want to perform an echocardiogram or other tests to ensure that your heart function remains stable and that there are no new complications.

5. Medication Review: If you are on any medications for your heart condition, ensure you are taking them as prescribed. Discuss with your doctor if any adjustments are needed based on your current symptoms.

In summary, while a rapid heart rate after blood donation can be a normal response, your underlying condition necessitates careful monitoring. If your heart rate remains elevated or if you develop any concerning symptoms, do not hesitate to contact your healthcare provider for further evaluation. Your health and safety are paramount, and it is always better to err on the side of caution, especially with a history of hypertrophic cardiomyopathy.

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