Final answer:
Heart palpitations are the sensation of a rapid, fluttering, or pounding heartbeat. They can be caused by various factors such as stress, anxiety, caffeine, medication side effects, and certain medical conditions.
Step-by-step explanation:
The client in this question is a 34-year-old man presenting to the emergency department with reports of heart palpitations. He denies chest pain, relevant cardiac history, and smoking. Heart palpitations are the sensation of a rapid, fluttering, or pounding heartbeat. They can be caused by various factors such as stress, anxiety, caffeine, medication side effects, and certain medical conditions. In this case, further evaluation by healthcare professionals, including medical history, physical examination, and possibly diagnostic tests, would be necessary to determine the cause of the palpitations.