The correct option is
B Defibrillator
When heart rate > 200 beats/min. then defibrillator is used for controlling the rhythm of heart. Defibrillation is a procedure used to treat life threatening conditions that affect the rhythm of the heart such as cardiac arrhythmia, ventricular fibrillation and pulseless ventricular tachycardia.
The procedure involves the delivery of an electric shock to the heart which causes depolarisation of the heart muscles and re-establishes normal conduction of the heart’s electrical impulse. The machine used to deliver this therapeutic shock to the heart is called a defibrillator.
The different types of defibrillators used include external defibrillators, transvenous defibrillators and implanted defibrillators.
Endoscopy is a nonsurgical procedure used to examine a person's digestive tract. Using an endoscope, a flexible tube with a light and camera attached to it, your doctor can view pictures of your digestive tract on a color TV monitor.
The sinoatrial node, known as SA node is located in the right atrial wall below the opening of the superior vena cava. The SA node initiates the cardiac cycle and sets the basic pace for the heart rate, hence called the pacemaker.
If this normal and natural electrical stimulation of heart fails, the conduction system is disrupted and heart blocks may result. In patients with heart block, normal heart rate can be restored and maintained with an Artificial Pace Maker.
A pace maker is a device that sends out small electrical charges that stimulate the heart. It consists of a pulse generator, a lead and an electrode. The pacemaker is inserted and implanted within the body. The Lithium battery provides power for about 10 years. It transmits repeated electrical impulses to the heart, that the heart rate is maintained at the required level.
An oxygenator is a medical device that is capable of exchanging oxygen and carbon dioxide in the blood of human patient during surgical procedures that may necessitate the interruption or cessation of blood flow in the body, a critical organ or great blood vessel.