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Heart Block (Slow Heart Rhythm)
A delay or block in the electrical signals that control the heartbeat, which can make the heart beat too slowly. Some forms need a pacemaker.
Causes & risk factors
- Ageing and wear of the electrical system
- Previous heart attack
- Heart muscle or valve disease
- Certain medicines
- Congenital (present from birth)
Common symptoms
Tests & diagnosis
- ECG
- Holter monitor
- Echocardiogram
- Electrolytes
- Thyroid function
Treatment & management
- Reviewing and adjusting medicines that slow the heart
- Treating reversible causes
- A permanent pacemaker for significant block
- Monitoring for mild, symptom-free cases
When to see a doctor urgently
- Call emergency services for fainting, severe dizziness or a very slow pulse
- See a doctor for repeated blackouts or unexplained tiredness
- Seek care if a very slow heart rate is noticed
Not a diagnosis. MedDroid gives general educational information about heart block (slow heart rhythm). It cannot examine you, diagnose or prescribe — always confirm with a qualified doctor.
Frequently asked questions
Does heart block always need a pacemaker?
No — mild first-degree block often needs only monitoring, but higher-degree block causing symptoms usually needs a pacemaker.
Is a pacemaker safe?
Pacemaker implantation is a common, well-established and generally safe procedure.
Explore more
Sources & further reading
- World Health Organization (WHO)
- MedlinePlus — U.S. National Library of Medicine
- Ministry of Health & Family Welfare, India
- Indian Council of Medical Research (ICMR)
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.