Which of the following findings is most likely on ventilation-perfusion lung scans? A 63-year old man comes to the emergency department 30 minutes after the sudden onset of right-sided chest pain and shortness of breath that began after a 10-hour drive in his truck. The pain is more sever with inspiration. He does not smoke cigarettes. His pulse is 110/min, and respirations are 32/min. the lungs are clear to auscultation.
A. Absence of perfusion in some areas that are ventilated B. Absence of ventilation in some areas that are perfused C. Absence of ventilation-perfusion mismatching D. Decreased perfusion gradient from the apices to the bases of the lungs E. Increased ventilation-perfusion ratios at lung bases compared with those at apices