What does V/Q stand for?

When a pregnant patient has a suspected pulmonary embolism, what are the typical embryo doses from a chest CT and a ventilation/perfusion study?

Rotational kinetic therapy for ventilation/perfusion mismatch.

Cancer diagnosis, age, and type of surgery (major vs minor) were evaluated in the context of VTE which was confirmed by spiral CT, pulmonary angiography or ventilation/perfusion scans.

Tests and Procedures for Lung Transplant Evaluation(a) Laboratory Arterial blood gases Complete blood count Electrolytes-BUN-creatinine-liver function tests Chest roentgenogrom Sputum culture Urinalysis Pulmonary assessment Pulmonary function tests Ventilation/perfusion scan Computed tomography scan when indicated Cardiac assessment 12-lead electrocardiogram Echocardiogram MUGA scan Right heart catheterization when indicated Coronary angiography for patients >40 y of age Other Bone density scan when indicated (a) Adapted from Egan TM, Kaiser LR, Cooper JD.

Following that, is an excellent review on Ventilation/Perfusion concepts by educator Bill Wojciechowski RRT.

ABSTRACT & COMMENTARY Synopsis: Ventilation/perfusion scanning appears to be safe and effective, at least in ruling out significant clinical pulmonary embolism in pregnant patients.

However, I believe helical CT will prove to have a high negative predictive value for recurrent thromboembolic disease and since the primary prognostic factor for recurrent pulmonary embolism is residual DVT in the proximal veins, the technique of combined CT pulmonary angiography and lower extremity and pelvic venography will supplant the ventilation/perfusion scan and become the examination of choice in the evaluation of suspected pulmonary embolism.

Later, however, Finley et al suggested that the alveolar-capillary membrane in interstitial pulmonary fibrosis (IPF) was affected in a non-uniform manner, leading to ventilation/perfusion ([V.