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V/Q Probability Classifier (PE)

Categorizing a ventilation/perfusion study for pulmonary embolism

Evidence AB#tool#pulmonary#decision
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Select the perfusion/ventilation pattern and chest-radiograph finding to categorize a V/Q study for pulmonary embolism and see the usual management implication. This is a simplified aid based on modified PIOPED II / EANM mismatch-based reading — clinical probability (e.g. Wells) and the whole study still govern the final call. Not a written directive.

Category
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Simplified modified-PIOPED-II / EANM mismatch-based aid. A normal perfusion scan effectively excludes PE; the hallmark of PE is segmental (or larger) mismatch. Integrate with clinical probability (Wells) and the full study — not a written directive.

Evidence & sources

APIOPED — The PIOPED Investigators. JAMA 1990;263:2753–2759: prospective probability categories for V/Q interpretation of pulmonary embolism. ↗
BModified PIOPED II & EANM V/Q SPECT guideline — mismatch-based interpretation; triple-match indeterminacy.
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