Describe the appearance of a normal V/Q scan. Does a normal perfusion scan effectively exclude PE? For what type of patient would CTPA be ideal for diagnosis of PE? For what type of patient would V/Q be ideal for diagnosis of PE? How are the pulmonary segments shown on a V/Q scan? How are the results of a V/Q scan reported in patients with suspected PE? How is a V/Q scan performed? How is a quantitative scan performed? How should a perfusion scan be altered if there is a suspected right-to-left shunt? List three causes of V/Q mismatch that involve the entire lung. List three common indications for a V/Q scan List three disadvantages of a V/Q scan. What are the main advantages of a V/Q scan over angiography or CTPA? What are the modified PIOPED criteria for a high-probability scan? What are the modified PIOPED criteria for a intermediate-probability scan? What are the modified PIOPED criteria for a low-probability scan? What are the perfusion scan findings with a right-to-left cardiac shunt? What conditions can cause a reverse mismatched defect? (list three) What conditions can cause a matched defect? (list six) What conditions can cause a mismatched defect? (list four) What conditions can cause bilateral perfusion defects? (list four) What conditions can cause unilateral perfusion defects? (list six) What conditions can cause ventilation abnormalities/ (list three) What is the difference between segmental and nonsegmental defects? What is the generally accepted terminology for describing the size of V/Q mismatches? What is the physiologic significance of a reverse mismatch? What is the risk of a PE in a patient with a normal perfusion scan? What is the stripe sign, and what is its significance? What is the terminology used in describing V/Q scan findings What finding on V/Q scan is most suggestive of PE? When should a quantitative V/Q scan be performed? When should one order a Doppler US of the lower extremities if the diagnosis of PE is being considered? Book traversal links for V/Q scans ‹ Which radiopharmaceutical is used in cancer patients? Up Describe the appearance of a normal V/Q scan. ›