PISAPED Criteria [From: J Nucl Med 2008; Sostman HD, et al. Sensitivity and specificity of perfusion scintigraphy combined with chest radiography for acute pulmonary embolism in PIOPED II. 49: 1741-1748]
| PE Present | One or more wedge-shaped perfusion defects |
| PE Absent | Normal perfusion Near normal perfusion Contour defect caused by enlarged heart, mediastinum, or diaphragm Perfusion defect, not wedge-shaped |
| Not diagnostic | Cannot classify as PE positive or PE negative |