Final answer:
Mr. Jones is diagnosed by Dr. Smith with bradycardia, a condition where the heart rate is slower than the normal resting rate below 60 bpm. Causes of bradycardia include inherent heart factors, metabolic and endocrine disorders, among others. Treatment focuses on the underlying cause, potentially requiring a pacemaker or supplemental oxygen.
Step-by-step explanation:
Dr. Smith diagnoses Mr. Jones with bradycardia, which is a condition characterized by a slow heart rate. In adults, a normal resting heart rate (HR) ranges from 60 to 100 beats per minute (bpm). Bradycardia occurs when the resting rate drops below 60 bpm. This condition can be caused by factors that are inherent to the heart, such as abnormalities in the sinoatrial (SA) or atrioventricular (AV) node. It can also be due to external causes including metabolic disorders, endocrine system pathologies, electrolyte imbalances, and the over-prescription of beta blocker drugs that reduce HR. Treatment for bradycardia depends on identifying the underlying cause of the disorder and may include therapies such as the use of a pacemaker or supplemental oxygen.