Final answer:
PJC and junctional tachycardia are abnormal heart rhythms that involve the AV node. Both conditions can cause symptoms and can be identified on an ECG.
Step-by-step explanation:
PJC and junctional tachycardia are both types of abnormal heart rhythms that originate in the atrioventricular (AV) node. The AV node is responsible for regulating the electrical signals that control the heartbeat. In both PJC and junctional tachycardia, the electrical signals in the heart are disrupted, causing the heart to beat faster than normal.
While PJC (Premature Junctional Complex) is characterized by an extra electrical signal that occurs earlier than expected in the AV node, junctional tachycardia is a sustained rapid heart rate that originates in the AV node.
Both conditions can manifest symptoms such as palpitations, lightheadedness, and shortness of breath. They can also be identified on an electrocardiogram (ECG) by the characteristic changes in the heart's electrical activity.