Question of the Week #74, 75

74) A 75 year-old man with history of hypertension presents to the emergency room with complaints of shortness of breath and palpitations. His vital reveal a heart rate 142/min, blood pressure 130/86, temperature 98.6 and oxygen saturation of 89% on room air. On auscultation, there are no rhonchii or crepitations, the heart rate was irregular and rapid with out any murmurs. The patient is placed on oxygen by nasal cannula. An urgent EKG is obtained which reveals rapid atrial fibrillation with no evidence of significant ST-T changes. The patient is started on diltiazem. Chest x-ray is normal and a brain natriuretic peptide is 80ng/L. Electrolytes, TSH and complete blood count are with in normal limits. Cardiac enzymes are drawn. Arterial blood gases reveal a pH of 7.48, po2 of 58, pco2 of 20 on room air ( Fio2 of 21%). The next step in establishing the etiology of his atrial fibrillation :

A) Cardiac catheterization
B) Spiral CT scan of the chest
C) Venos doppler of lower extremities
D) 2D Echocardiogram
E) D-Dimer

75) What is the most likely etiology of atrial fibrillation in Case 1?

A) Acute ST elevation MI
B) Acute pulmonary embolism
C) Pneumothorax
D) COPD exacerbation
E) Congestive heart failure

One Response

  1. E,B

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