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4843 Physiology

A 67-year-old man with an 18-year history of type 2 diabetes mellitus presents for a routine physical examination. His temperature is 36.9 C (98.5 F), his blood pressure is 158/98 mm Hg and his pulse is 82/minute and regular. On examination, the physician notes a non tender, pulsatile, mass in the mid-abdomen. A plain abdominal x-ray film with the patient in the lateral position reveals spotty calcification of a markedly dilated abdominal aoic walI. Which of the following physiologic observations helps to account for the fact that 75% of the aneurysms of this patient’s type are found in the abdomen and only 25% principally involve the thorax?

ADiastolic pressure is greater in the abdominal aoa in the supine position
BNegative intrathoracic pressure reduces aoic wall tension in the thorax
CThe average blood flow in the abdominal aoa is greater than that in the thoracic aoa
DThe average blood pressure in the abdominal aoa is higher than that in the thoracic aoa
Physiology
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