Why electric shock can stop the heart beat?

An electric shock can stop the heart by causing ventricular fibrillation. This is a condition in which the heart's ventricles (the lower chambers of the heart) contract in a rapid and uncoordinated manner, preventing the heart from pumping blood effectively. This can lead to a sudden cardiac arrest, which is a life-threatening condition.

Electric shocks can cause ventricular fibrillation by disrupting the electrical signals that control the heart's contractions. Normally, these electrical signals are generated by the heart's sinoatrial node (SA node) and travel down through the heart, causing the ventricles to contract. However, an electric shock can disrupt this normal electrical activity, causing the ventricles to contract in an irregular and uncoordinated manner.

The severity of the electric shock will determine whether or not it causes ventricular fibrillation. Small shocks, such as those from static electricity, are not typically strong enough to cause ventricular fibrillation. However, larger shocks, such as those from power lines or lightning strikes, can be more dangerous and can lead to ventricular fibrillation and cardiac arrest.

Electric shocks can also cause other heart problems, such as atrial fibrillation (a condition in which the upper chambers of the heart contract in a rapid and uncoordinated manner), heart block (a condition in which the electrical signals from the SA node are blocked from reaching the ventricles), and cardiac arrest.

If you are ever exposed to an electric shock, it is important to seek medical attention immediately, even if you do not feel any symptoms.