Defibrillation is a treatment for life-threatening cardiac dysrhythmias, specifically ventricular fibrillation (VF) and non-perfusing ventricular tachycardia (VT). A defibrillator delivers a dose of electric current (often called a countershock) to the heart. This depolarizes a large amount of the heart muscle, ending the dysrhythmia. Subsequently, the body's natural pacemaker in the sinoatrial node of the heart is able to re-establish normal sinus rhythm.
Benzocaine is a local anesthetic commonly used as a topical pain reliever or in cough drops. It is the active ingredient in many over-the-counter anesthetic ointments such as products for oral ulcers.
Oral Pain Relief (benzocaine topical) side effects. Benzocaine topical used in the mouth or throat may cause a rare but life-threatening condition called methemoglobinemia. In this condition, the amount of oxygen in your blood stream becomes dangerously low. This condition may occur after only one use of benzocaine or after several uses.