1. A 50-year-old male patient presents with acute chest pain radiating to the left arm. ECG shows elevated ST segments. Which cardiac marker would you expect to be elevated first? - A. Myoglobin - B. Troponin - C. Creatine kinase-MB - D. LDH Answer: B. Troponin Rationale: Troponin is the most sensitive and specific marker for myocardial injury and begins to rise within 3-4 hours after the onset of chest pain. 2. During a routine examination, a patient is found to have a lower than normal tidal volume. Which of the following conditions is NOT a likely cause? - A. Asthma - B. Pneumonia - C. Rib fracture