Defibrillators are lifesaving devices that can be used to shock someone’s heart out of a dangerous heart rhythm, called ventricular fibrillation.
They’re so simple to use that they’re widely available and easy to use by the general public. Still, reckless use of these devices can lead to death.
Restarting the heart
Restarting a heart is sometimes done using drugs like epinephrine and atropine, or a life-saving device called a defibrillator. A defibrillator uses moderately high voltage (between 200 and 1,000 volts) to shock the heart, which essentially resets the SA node and forces it to resume its normal electrical activity.
Defibrillators are most commonly used to stop the abnormal quivering of the heart muscle that causes someone to collapse. This rhythm is called ventricular fibrillation and will cause death in about 3-5 minutes.
A defibrillator can also be used to restart the heart, but it isn’t used often because it doesn’t work on people with a normal heart rhythm. If a person has a rhythm that can’t be stopped with drugs, such as atrial fibrillation or ventricular tachcardia, then the defibrillator will need to be switched off so that the heart can naturally return to its normal rhythm on it’s own.
A 65-year-old man in Malaysia regained his vital signs two and a half hours after being pronounced dead by doctors at Seberang Jaya Hospital, Penang.
Disabling a pacemaker
In some cases, doctors may recommend disabling your pacemaker (ICD) if you no longer want to receive shocks to prevent sudden cardiac death. This is called ICD deactivation and is legal in many countries, including Canada.
Your doctor will discuss the procedure with you. You’ll also need to decide which method is right for you.
A transvenous approach: In this approach, your specialist will make a small incision in your chest and then insert the lead(s) into a vein. They’ll then use fluoroscopy to guide the leads through the vein to your heart.
Your surgeon will then attach the electrodes to your heart muscle and implant a pulse generator. The pulse generator has a battery and electrical circuits that send regular pulses to your heart to regulate your normal rate.
Disabling a defibrillator
Defibrillators are devices that can help restart the heart when someone has a cardiac arrest. They use electricity to shock the heart back into its normal rhythm.
Using the defib as a stun gun is an option that can be helpful if you are in an emergency situation and need to defend yourself from an attacker. It is important to remember, however, that a stun gun can cause injuries.
A defibrillator should not be used to restart the heart in someone who has a flat ECG rhythm (such as asystole). It is only used to treat life-threatening arrhythmias, including ventricular fibrillation and non-perfusing ventricular tachycardia.
Getting defibrillated before an ambulance arrives can increase your chances of survival. However, in the UK, only one out of every 10 patients survives a cardiac arrest. This is because of delays to find the defibrillator and deliver a shock.
Stun gun
The stun gun works by delivering a high-voltage shock that interferes with the nerve impulses sent to the voluntary muscles. In just one to two seconds, it can cause the victim’s muscle control and balance to be thrown out of whack, leading to a disoriented state.
When used properly, the stun gun can be effective at stopping a violent attacker. A contact of a few seconds with an attacker’s body produces a jolt that brings him down, disorienting him and incapacitating him.
Stun guns are generally legal to purchase, possess and carry in the United States for self-defense. However, laws and regulations may vary by state and locality.