RT Journal Article SR Electronic T1 Positional oximetry to screen for pulmonary arteriovenous malformations in HHT JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 1045 OP 1045 DO 10.1136/thoraxjnl-2013-205028 VO 69 IS 11 A1 Susan Carpenter A1 Janina Josepovici A1 Giuseppe Latino A1 Felix Ratjen YR 2014 UL http://thorax.bmj.com/content/69/11/1045.abstract AB Orthodeoxia has been described in patients with hereditary haemorrhagic telangiectasia (HHT) and pulmonary arteriovenous malformations (PAVM), but its usefulness in screening children for PAVMs is unknown. We show here that while oximetry is overall lower in children with significant PAVMs, supine and upright oximetry is of no additional diagnostic value indicating that positional oximetry is not a useful screening test for PAVMs.