A pt with acute coronary syndrome/ unstable angina has received morphine with relief of symptoms. The nurse notes a sudden widening of the QRS complex, although the pt remains in sinus rhythm. A 12 lead ECG indicates the development of a new-onset left bundle branch block. Which of the following should the nurse anticipate
A. electrophysiology study
B. transeophageal echocardiogram with bubble study
C. evaluation for contraindications of fibrinolytic therapy
D. troponin I