Resting heart rate is

a)
heart rate after completing a period of exercise.

b)
desirable minimum heartbeats needed to reach a level of activity and maintain that heart rate necessary to improve your cardiovascular fitness.

c)
number of contractions of the heart that occur in a one minute when your body is at rest.

d)
the minimum number of beats per minute your heart must beat to be able to fall asleep.

A62-year-old man is being treated for an acute myocardial infarction. he originally came to the ed with substernal chest pain and diaphoresis. given his risk factors of hypertension, diabetes, tobacco use, and family history, he is considered high risk. an ecg in the ed reveals a left-bundle branch pattern, and cardiac enzymes are elevated slightly. after a focused evaluation in the ed, the patient receives iv thrombolytics. although his bundle branch pattern never resolves, the patient is chest pain-free and haemodynamically stable after thrombolysis. two days later, however, the patient reports episodes of recurrent chest discomfort and shortness of breath overnight. in evaluating for potential myocardial reinfarction, which of the following is the most appropriate diagnostic test? - creatinine kinase- dynamic ecg changes- lactate dehydrogenase- myoglobin levels- troponin i level