shunt

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Effect on migraine of closure of cardiac right-to-left shunts to prevent recurrence of decompression illness or stroke or for haemodynamic reasons.
Roberts et al., "Accuracy of conventional transthoracic echocardiography for the diagnosis of intracardiac right-to-left shunt: a meta-analysis of prospective studies," Echocardiography, vol.
All patients underwent TCD ultrasonography or TTE with saline contrast injection 3 and 12 months after procedure to quantify residual right-to-left shunt. If a significant residual shunt was detected at 1 year, TEE was performed to check whether a second device was needed.
In patients with HHT, cerebral abscesses arise in the presence of uncontrolled right-to-left shunt, facilitating septic thrombus embolisation through PAVMs.
Atrial septostomy can relieve the load on the right ventricle by creating a right-to-left shunt, and increase the left ventricular preload and the cardiac output.
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)
It is proposed that the patient also had paradoxical air embolism related to a physiological pulmonary or cardiac right-to-left shunt. Cardiac right-to-left shunts may be intermittent because of briefly elevated right-sided cardiac pressures that cause right atrial pressure to be higher than left atrial pressure, creating a patent foramen ovale (PFO) (Carey, Boltax, Dickey, & Finkelstein, 1999; Cheng, 1976).
This anomaly is accompanied by an intracardiac right-to-left shunt through a patent foramen ovale or an atrial septal defect.(1) Clinical and radiological features depend on the location of the anomalous pulmonary venous connection.
LOS ANGELES -- Cognitive deficits can occur between episodes of migraine with aura in patients with a large right-to-left shunt in the heart, according to interim results from a small, prospective, double-blind, observational study.
Q: I had a stroke in 2003, and a diagnostic test showed a "hole" in my heart with no right-to-left shunt. The shunt didn't show up on a different kind of test in 2009, either.