Modified PISAPED Criteria in Combination with Ventilation Scintigraphic Finding for Predicting Acute Pulmonary...

Area of Science:

• Nuclear Medicine
• Radiology
• Cardiology

Background:

• Acute pulmonary embolism (PE) is a significant cause of morbidity and mortality.
• Accurate and timely diagnosis of PE is crucial for effective treatment.
• Pulmonary scintigraphy is a key imaging modality for PE diagnosis.

Purpose of the Study:

• To assess and compare the diagnostic performance of three pulmonary scintigraphic algorithms for acute PE.
• To evaluate the utility of newly developed modified PISAPED criteria.
• To determine which algorithm offers the highest diagnostic accuracy in patients with suspected PE and normal chest X-rays.

Main Methods:

• Prospective clinical study involving patients with suspected PE and normal chest X-rays.
• Evaluation of three algorithms: V/Q scintigraphy with modified PIOPED criteria, perfusion scintigraphy with PISAPED criteria, and perfusion/ventilation scans with modified PISAPED criteria.
• Comparison with CT pulmonary angiography (CTPA) and 24-week clinical outcome assessment.

Main Results:

• Modified PISAPED criteria with V/Q scans demonstrated high sensitivity (83.8%) and specificity (89.1%), with no nondiagnostic results.
• The area under the ROC curve for modified PISAPED criteria was 0.864, indicating superior diagnostic performance.
• Traditional PIOPED criteria yielded high sensitivity (95.0%) but resulted in a high rate of nondiagnostic classifications (57.4%).

Conclusions:

• Combining lung perfusion and ventilation scans with modified PISAPED criteria significantly enhances diagnostic accuracy for acute PE.
• This approach offers a more reliable alternative to traditional PIOPED and PISAPED criteria, minimizing nondiagnostic interpretations.
• Pulmonary scintigraphy, particularly with the modified PISAPED algorithm, is a valuable tool for diagnosing acute PE in selected patients.