Experiencing Rapid Heartbeat During the Day? Possible Causes Explained

Increased heart rate during the day?

Hello Doctor: I have been experiencing a rapid heartbeat during the day, often reaching 90 to 100 beats per minute.
I have previously undergone thyroid tests which showed no issues, as well as a 24-hour Holter monitor and an echocardiogram, which only revealed mild mitral valve prolapse.
The doctors have said there is nothing significant, but I still feel uncomfortable with my heart rate being so fast.
Could you please advise what might be causing this? Thank you, Doctor.

Xiao Li, 20~29 year old female. Ask Date: 2016/04/17

Dr. Li Han reply Cardiology

Hello, Xiao Li.
Regarding your inquiry about experiencing a rapid heartbeat during the day, often reaching 90 to 100 beats per minute, and the fact that you have undergone thyroid tests which showed no issues, as well as a 24-hour Holter monitor and echocardiogram that only revealed mild mitral valve prolapse with normal results...
Generally speaking, palpitations are a subjective symptom.
Objectively, they may be related to arrhythmias, but they may also not be.
More details about the symptoms would be needed for better speculation.
However, if your previous physician indicated that everything was "normal," it likely refers to the physical examinations or recorded electrocardiograms being normal, and there are no accompanying symptoms that pose a risk.
If you still have concerns, it may be worthwhile to consult a cardiologist for further advice.
The Changhua Hospital of the Ministry of Health and Welfare cares about your well-being.

Reply Date: 2016/04/17

More Info

Experiencing a rapid heartbeat, also known as tachycardia, can be concerning, especially when it occurs frequently during the day. Based on your description, where your heart rate often reaches the 90s to 100s beats per minute, and considering that you have undergone thorough examinations including thyroid tests, a 24-hour Holter monitor, and an echocardiogram that revealed only mild mitral valve prolapse, it’s essential to explore potential causes and management strategies.

Firstly, it’s important to understand that a rapid heartbeat can be influenced by a variety of factors. Given that your thyroid function is normal, we can rule out hyperthyroidism as a cause. Here are some common reasons for experiencing a rapid heartbeat:
1. Anxiety and Stress: Emotional factors such as anxiety, stress, or panic attacks can significantly increase heart rate. The body’s fight-or-flight response triggers the release of adrenaline, which can lead to a faster heartbeat. If you find yourself feeling anxious or stressed, this could be a contributing factor.

2. Physical Activity: Engaging in physical activities or exercise can naturally elevate your heart rate. However, if you are experiencing rapid heartbeats even at rest or with minimal exertion, this may warrant further investigation.

3. Caffeine and Stimulants: Consumption of caffeine (found in coffee, tea, energy drinks, etc.) or other stimulants can lead to increased heart rates. If you consume these substances regularly, consider reducing your intake to see if your symptoms improve.

4. Dehydration: Inadequate fluid intake can lead to dehydration, which can cause the heart to work harder and increase the heart rate. Ensure you are drinking enough water throughout the day.

5. Medications: Certain medications, including over-the-counter cold medications and some prescription drugs, can cause an increased heart rate as a side effect. Review any medications you are taking with your healthcare provider.

6. Electrolyte Imbalances: Imbalances in electrolytes such as potassium, magnesium, and calcium can affect heart rhythm and rate. A blood test can help determine if this is a factor.

7. Underlying Heart Conditions: While your echocardiogram showed only mild mitral valve prolapse, it’s essential to monitor for any changes. Mitral valve prolapse can sometimes be associated with palpitations or rapid heartbeats, although it is often benign.

8. Autonomic Nervous System Dysfunction: Conditions that affect the autonomic nervous system, such as dysautonomia, can lead to symptoms like rapid heartbeat and palpitations.

Given your symptoms and the fact that you feel uncomfortable with the rapid heartbeats, it’s advisable to maintain open communication with your healthcare provider. If the episodes of rapid heartbeat persist or worsen, or if you experience additional symptoms such as chest pain, shortness of breath, or fainting, seek medical attention promptly.

In the meantime, consider implementing lifestyle changes that may help manage your symptoms. These include practicing relaxation techniques such as deep breathing, yoga, or meditation to reduce anxiety, ensuring adequate hydration, and maintaining a balanced diet. Regular physical activity can also help improve overall cardiovascular health, but be sure to listen to your body and avoid overexertion.

Lastly, if you have not already done so, you might want to discuss the possibility of a follow-up appointment with a cardiologist or a specialist in arrhythmias. They may recommend further monitoring or testing to ensure that there are no underlying issues that need to be addressed.

In summary, while experiencing a rapid heartbeat can be alarming, many factors can contribute to this symptom. By working closely with your healthcare provider and making some lifestyle adjustments, you can better manage your heart health and overall well-being.

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