intrapulmonary shunt

intrapulmonary shunt

Etymology: L, intra + pulmoneus, relating to the lung
(in respiratory therapy) a condition in which a region of the lungs is perfused with little or no ventilation. It is indicated by a low ratio of QS/QT, in which QS represents the difference between end capillary oxygen content and mixed venous oxygen content and QT represents cardiac output. The condition may occur in atelectasis, pneumonia, pulmonary edema, and adult respiratory distress syndrome.
References in periodicals archive ?
2) HPS results from impaired liver clearance of various vascular mediators leading to an imbalance between vasodilators and vasoconstrictors that causes abnormal intrapulmonary vasodilation and intrapulmonary shunt.
sup][13] Contralateral decubitus positioning of the patient seems to be a reasonable step that may help in reducing the progression of edema and improving the intrapulmonary shunt.
Comparison of transesophageal and transthoracic contrast echocardiography for detection of an intrapulmonary shunt in liver disease.
Potential mechanisms of stroke by PICC Arterial PICC placement with the catheter tip central to the carotid or vertebral arteries Venous PICC placement with an existing right-to-left shunt Intrapulmonary shunt --Pulmonary arteriovenous malformation (AVM) Intracardiac shunt --Atrial or ventricular septal defect (ASD, VSD) --Patent foramen ovale (PFO) Shunt between aorta and pulmonary artery --Patent ductus arteriosus (PDA) Thoracic venous anomalies --Persistent left SVC draining directly into the left atrium (this drainage pattern is present in < 10% of patients with a persistent left SVC)
Changes in cardiac output have been reported to positively correlate with the intrapulmonary shunt fraction (5).
Lung perfusion scintigraphy revealed findings suggesting intrapulmonary shunt with a rate of 23% and lung tomography with contrast material was taken.
If and when the intrapulmonary shunt is severe, as was seen in our cases, optimisation of factors that could affect the mixed venous saturation becomes of prime importance.
We aimed to conduct a meta-analysis to compare oxygenation and intrapulmonary shunt during OLV in adults undergoing thoracic surgery with dexmedetomidine (Dex) versus placebo to assess the influence and safety of using Dex.
In conclusion, the origin of the hypoxaemia in consolidative forms of bronchoalveolar carcinoma is possibly secondary to intrapulmonary shunt through dilated vessels with massive plasma leakage.
Transthoracic echocardiography showed a patent foramen ovale, with no signs of structural anomalies, such as right-to-left shunt or intrapulmonary shunt, which could potentially lead to respiratory failure.
It is a very useful formula in evaluating the degree of intrapulmonary shunt and subsequent compromise of cardiopulmonary function.