Understanding Complete Heart Block Symptoms
Learn to recognize symptoms of complete heart block, including dizziness, fatigue, and fainting. Understand when to seek medical help for this serious heart condition.
Written by Dr. Rohinipriyanka Pondugula
Reviewed by Dr. Shaik Abdul Kalam MD (Physician)
Last updated on 20th Aug, 2025
Heart health is crucial for overall well-being, and conditions like complete heart block can be concerning if left untreated. If you or a loved one has been diagnosed with this condition or are experiencing symptoms, it’s important to understand what it means and how to manage it effectively.
What Is Complete Heart Block?
Complete heart block, also known as third-degree atrioventricular (AV) block, is a serious condition where the electrical signals that control your heartbeat are completely blocked between the upper chambers (atria) and lower chambers (ventricles) of the heart. This disruption means your heart cannot pump blood efficiently, leading to a dangerously slow heart rate.
Common Symptoms of Complete Heart Block
People with complete heart block may experience:
Extreme fatigue: Feeling unusually tired even with minimal activity.
Dizziness or lightheadedness: Due to insufficient blood flow to the brain.
Fainting (syncope): Sudden loss of consciousness because of very low heart rate.
Shortness of breath: Difficulty breathing, especially during exertion.
Chest pain or discomfort: Due to the heart struggling to pump blood.
Slow or irregular pulse: A noticeable drop in heart rate (bradycardia).
In some cases, complete heart block can lead to cardiac arrest if not treated promptly.
What Causes Complete Heart Block?
Several factors can contribute to this condition:
Ageing: Natural wear and tear on the heart’s electrical system.
Heart disease: Coronary artery disease, heart attack, or cardiomyopathy.
Infections: Such as Lyme disease or myocarditis.
Medications: Certain drugs like beta-blockers or calcium channel blockers.
Congenital conditions: Some people are born with heart block.
How Does Complete Heart Block Affect Health?
When your heart beats too slowly, your body doesn’t get enough oxygen-rich blood. This can lead to:
Low energy levels: Making daily activities difficult.
Organ damage: Especially the brain and kidneys, due to poor circulation.
Increased risk of heart failure: The heart struggles to meet the body’s demands.
Consult Top Specialists
Managing Complete Heart Block
If you’ve been diagnosed with complete heart block, here’s how you can take control of your health:
1. Medical Treatments
Pacemaker implantation: The most common and effective treatment. A small device is placed under the skin to regulate your heartbeat.
Medication adjustments: If drugs are causing the block, your doctor may change your prescription.
2. Lifestyle Changes
Regular check-ups: Monitor your heart health with routine ECG and pacemaker checks.
Heart-healthy diet: Focus on low-sodium, high-fibre foods like fruits, vegetables, and whole grains.
Moderate exercise: Light activities like walking can improve circulation (consult your doctor first).
Avoid smoking and excessive alcohol: These can worsen heart conditions.
3. Warning Signs to Watch For
Seek emergency help if you experience:
Sudden fainting
Severe chest pain
Extreme shortness of breath
Unusually slow or irregular heartbeat
When to See a Doctor?
If you notice any symptoms of complete heart block, don’t ignore them. Early diagnosis and treatment can prevent complications.
Book a Consultation with Apollo 24|7
If you suspect heart block or need expert advice, Apollo 24|7 offers:
Cardiology consultations: Speak to top heart specialists.
Diagnostic tests: ECG, Holter monitoring, and echocardiograms.
Pacemaker follow-ups: Ensure your device is working correctly.
You can easily schedule an appointment through the Apollo 24|7 app or website.
Conclusion
Complete heart block is a serious condition, but with the right treatment and lifestyle adjustments, you can lead a healthy, active life. If you or someone you know is experiencing symptoms, seek medical attention promptly.
Stay informed, stay proactive, and take care of your heart—it’s the key to a long and healthy life!
Consult Top Specialists
Consult Top Specialists
Dr. Diganta Buragohain
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1 Years • "DM (Cardiology) in 2025 from NEIGRIHMS, Shillong MD (General Medicine) in 2020 Gauhati Medical College, MBBS in 2015 from Gauhati Medical College,"
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Dr. Srinivasan K N
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