Cardioversion refers to the process of restoring normal heart rhythm to an abnormally beating heart. This can be achieved thorough electrical cardioversion and through the use of medications.
This involves providing the heart with an electrical shock which will essentially stop the heart completely and reset the rhythm. When an external device is used, it is called an external defibrillator. An easy to use variation of this is usually available in public areas called an Automated External Defibrillator (AED). In certain patients with an abnormal heart rhythm, a device may be placed within the body to monitor the electrical activity and provide shocks, if needed, to maintain normal rhythm. These are called Implantable cardioverter-defibrillators (ICD).
These are found in all hospitals and used frequently in emergency rooms to fix abnormal heart rhythms (arrhythmias) which often occur suddenly and leading to cardiac arrest and failure of the heart to pump blood. The following types of rhythm can be corrected using a defibrillator
Steps in using an External Defibrillator
These are small devices that are surgically placed under the skin in the region of the chest or upper abdomen. There are electrodes which are threaded through the blood vessels in the chest to reach the heart. This detects the rhythm of the heart throughout the day. In the event of an abnormal heart rhythm, the ICD is capable of delivering a shock to the heart. These devices are used for individuals who are prone for recurrent life threatening arrhythmias.
It is important to remember to mention you have an ICD if scheduled for an MRI scan. Older ICDs have been an absolute contraindication for MRIs, but several newer ICDs are now in the market which can be adjusted to avoid complications.
There are several different classes of drugs which can be taken both orally and through injections in the veins which can help to control arrhythmias. These medications act by changing the movement of charged ions in the cells of the heart muscle and thereby can modify the electrical activity. This can take a few days before any effect is seen. These medicines are usually initiated while admitted in the hospital under cardiac supervision. In the case of AF, drugs can be taken to control the heart rate alone even if it is not possible to treat the abnormal rhythm.
This post was last modified on July 27, 2023 6:33 am
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