What does the cathode represent in a cardiac device system?

In a cardiac device system, the cathode represents the negative electrode. This is crucial for understanding how the device interacts with the heart. In terms of electrical circuits, the cathode is the point where the electrons flow into the device from the external circuit. This negatively charged electrode is fundamental for stimulating the myocardium (heart muscle) to contract.

In a typical pacing scenario, when the device delivers a pulse to stimulate the heart, the cathode emits electrical signals that cause myocardial depolarization, leading to a heart beat. Understanding the role of the cathode helps medical professionals grasp the operational principles behind cardiac devices, such as pacemakers and implantable cardioverter-defibrillators (ICDs). Recognizing this distinction is necessary for the effective programming and troubleshooting of these devices during patient management.