PTA Physical Therapy Assistant

Answer: C - LDH₁ is the more sensitive indicator of myocardial infarction.

LDH₁ is an isoenzyme of LDH which is the more sensitive indicator than the total LDH.

Creatine kinase starts rising at 4 - 6 hours and peaks at 12 hours and then falls back normal within 48 to 72 hours.

Aspertateaminotransferate rises at 12 hours and peaks at the first and the second day.

Total LDH rises after 12 hours and peaks after 2 -3 days, and remains elevated for a week.