External DC cardioversion involves delivering a controlled electrical shock to the heart through the chest wall, allowing the heart’s natural electrical system to reset into a normal rhythm. It involves delivering a controlled electrical shock to the heart through the chest wall, allowing the heart’s natural electrical system to reset into a normal rhythm. This is done under sedation or light anaesthesia and external pads are applied to the chest wall, through which a synchronised electric shock can be given to reset the heart.
Internal DC cardioversion is a specialist procedure used when external cardioversion has not been successful or is not suitable. It delivers a controlled electrical shock directly within the heart to restore normal rhythm. It involves delivering a controlled electrical shock to the heart internally, allowing the heart’s natural electrical system to reset into a normal rhythm. This is done under sedation or anaesthesia. It is mainly done in patients with ICD’s that can be activated on demand. However, sometimes it is done with catheters inserted into the heart via the blood vessels, allowing the cardiologist to deliver a carefully controlled electrical shock directly inside the heart chambers.
Why Might I Need Cardioversion?
Your cardiologist may recommend external cardioversion if you experience:
- Persistent atrial fibrillation
- Atrial flutter
- Palpitations or rapid heart rate
- Breathlessness or fatigue due to abnormal rhythm
- Reduced exercise tolerance
What Happens During the Procedure?
The procedure is carried out in a controlled hospital environment under sedation or light anaesthesia to ensure you are comfortable and unaware of the shock.
Pads are placed on the chest (and sometimes the back), and a synchronised electrical impulse is delivered to restore normal rhythm.
The procedure is quick, and heart rhythm is monitored continuously throughout.
Recovery and Results
Most patients recover quickly and can go home the same day. Your cardiologist will discuss whether medication is needed afterwards to maintain normal rhythm.
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