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Ventilation-Perfusion Ratio 387 articles

  1. Respiratory physiology at altitude.

    Journal of the Royal Army Medical Corps 157(1):29 (2011) PMID 21465907

    The changes in respiratory physiology that occur with increasing altitude are driven by the fall in the partial pressure of oxygen that occurs with decreasing barometric pressure. At altitude, respiratory system changes occur which impact on each step of the oxygen cascade that occurs within the body...
  2. A lung computed tomographic assessment of positive end-expiratory pressure-induced lung overdistension.

    American Journal of Respiratory and Critical Ca... 158(5):1571 (1998) PMID 9817710

    The aim of this study was to assess positive end-expiratory pressure (PEEP)-induced lung overdistension and alveolar recruitment in six patients with acute lung injury (ALI) using a computed tomographic (CT) scan method. Lung overdistension was first determined in six healthy volunteers in whom CT s...
  3. Unsuspected pulmonary embolism: prospective detection on routine helical CT scans.

    Radiology 208(1):209 (1998) PMID 9646815

    Twelve (1.5%) of the 785 patients had unsuspected PE, with an inpatient prevalence of 5% (eight of 160) and an outpatient prevalence of 0.6% (four of 625). Of the 12 patients with unsuspected PE, 10 (83%) had cancer. Of the 81 inpatients with cancer, seven (9%) had unsuspected PE. A dedicated workst...
  4. Work-up of patients with malignancy after an intermediate-probability ventilation-perfusion scan: why don't physicians pursue a definitive d...

    Academic Radiology 4(12):806 (1997) PMID 9412693

    The frequency of malignancy was significantly greater in group 1 than in group 2 (P = .012). Although the estimated 2-year survival of group 1 patients was significantly less than that of group 2 patients (P = .039), this difference is likely due to confounding by age and malignancy. CONCLUSION: Whe...
  5. Aerosolized manganese SOD decreases hyperoxic pulmonary injury in primates. I. Physiology and biochemistry.

    Journal of Applied Physiology 83(2):550 (1997) PMID 9262452

  6. [Functional studies in blunt thoracic trauma with special reference to perfusion and ventilation scintigraphy].

    Der Chirurg 56(3):147 (1985) PMID 3987433

    We carried out a routine chest X-ray examination together with an arterial blood gas analysis, spirometry and a combined pulmonary perfusion/ventilation scintigram. Scintigraphy was shown to be the most sensitive method in the detection of impaired post-traumatic pulmonary function. Since it is a ti...
  7. A review of electrocardiography in pulmonary embolism: recognizing pulmonary embolus masquerading as ST-elevation myocardial infarction.

    Reviews in Cardiovascular Medicine 12(3):157 (2011) PMID 22145193

    We review the differential diagnosis of ST elevation and the assorted spectrum of ECG changes seen in PE....
  8. Tc-99m Technegas scintigraphy to evaluate the lung ventilation in patients with oral corticosteroid-dependent bronchial asthma.

    Annals of Nuclear Medicine 13(4):247 (1999) PMID 10510881

    Our data demonstrate that airflow obstruction took place in patients with corticosteroid-dependent asthma even during remission. Technegas scanning appears to be a useful radiopharmaceutical for demonstrating airflow obstruction in patients with bronchial asthma....
  9. Perfusion recovery after lung volume reduction surgery.

    Clinical Nuclear Medicine 24(8):619 (1999) PMID 10439194

  10. Can CT pulmonary angiography replace ventilation-perfusion scans as a first line investigation for pulmonary emboli?

    Australasian Radiology 43(3):311 (1999) PMID 10901924

    A prospective study was performed to determine efficacy of diagnosis of pulmonary emboli by computed tomographic pulmonary angiography (CTPA) in patients who underwent both CTPA and ventilation-perfusion (V/Q) scanning. The results were compared with the Prospective Investigation of Pulmonary Emboli...