# Prospective Investigation of Pulmonary Embolism Diagnosis (PIOPED)

> **NCT00000566** · PHASE3 · COMPLETED · sponsor: **National Heart, Lung, and Blood Institute (NHLBI)**

## Conditions studied

- Lung Diseases
- Pulmonary Embolism

## Interventions

- **PROCEDURE:** ventilation-perfusion ratio
- **PROCEDURE:** angiography

## Key facts

- **NCT ID:** NCT00000566
- **Lead sponsor:** National Heart, Lung, and Blood Institute (NHLBI)
- **Sponsor class:** NIH
- **Phase:** PHASE3
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 1983-09
- **Primary completion:** —
- **Final completion:** 1989-12
- **Target enrollment:** — (—)
- **Last updated:** 2016-04-15


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT00000566

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT00000566, "Prospective Investigation of Pulmonary Embolism Diagnosis (PIOPED)". Retrieved via AI Analytics 2026-06-02 from https://api.ai-analytics.org/clinical/NCT00000566. Licensed CC0.

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*[Clinical trials dataset](/datasets/clinical-trials) · CC0 1.0*