Final answer:
Junctional bradycardia refers to a heart rhythm originating from the AV node with a rate below 60 bpm, which can lead to symptoms like dizziness and may require a pacemaker if severe.
Step-by-step explanation:
Understanding Junctional Bradycardia
Junctional bradycardia is a type of heart arrhythmia characterized by a slow heart rate that originates in the AV node or surrounding tissue, typically at rates below 60 beats per minute (bpm). Bradycardia can present with various symptoms such as dizziness, fatigue, or chest discomfort, and if severe enough, may require the placement of a pacemaker. Causes for this type of bradycardia range from inherent factors like abnormalities within the heart's conduction system to external factors including metabolic disorders or medication effects. Identifying the exact cause is crucial for appropriate treatment, which could involve managing the underlying condition or, in some cases, providing supplemental oxygen to support cardiac function.