Webb, S T Preoperative percutaneous patent foramen ovale closure before neurosurgery in the sitting position. [electronic resource] - British journal of anaesthesia Aug 2009 - 305; author reply 306 p. digital Publication Type: Comment; Letter ISSN: 1471-6771 Standard No.: 10.1093/bja/aep185 doi Subjects--Topical Terms: Embolism, Air--etiologyEmbolism, Paradoxical--etiologyForamen Ovale, Patent--surgeryHumansNeurosurgical Procedures--adverse effectsPosture