title: Platypnea-orthodeoxia Syndrome Diagnosed Using Contrast Transesophageal Echocardiography with Simultaneous SpO2 Monitoring.
abstract: Platypnea-orthodeoxia syndrome (POS) is a rare condition characterized by interatrial right-to-left shunting that is exacerbated in the upright position. We herein report a 78-year-old woman with POS that remained undiagnosed for 2 years, despite repetitive transthoracic echocardiography (TTE). POS was ultimately diagnosed using contrast transesophageal echocardiography (TEE), which revealed a marked increase in right-to-left shunting in the sitting position, associated with simultaneous desaturation. Therefore, we propose that POS should be considered according to the clinical symptoms, regardless of the repetitive TTE results, and contrast TEE should be performed in both the supine and sitting positions to exclude a diagnosis of POS.
authors: Tazuke Kofukai Foundation, Medical Research Institute, Kitano Hospital, Cardiovascular Center, Japan.
authors: Takayuki
authors: T
authors: Sekihara
authors: Masahiro
authors: M
authors: Kimura
authors: Daisuke
authors: D
authors: Hazama
authors: Yuki
authors: Y
authors: Kimura
authors: Hideyuki
authors: H
authors: Hayashi
authors: Mitsumasa
authors: M
authors: Okano
authors: Moritoshi
authors: M
authors: Funasako
authors: Kenichi
authors: K
authors: Sasaki
authors: Eisaku
authors: E
authors: Nakane
authors: Shoichi
authors: S
authors: Miyamoto
authors: Toshiaki
authors: T
authors: Izumi
authors: Tetsuya
authors: T
authors: Haruna
authors: Motonari
authors: M
authors: Fukui
authors: Moriaki
authors: M
authors: Inoko
mesh_terms: D000368:Aged; D004417:Dyspnea / Q000175:diagnosis; D017548:Echocardiography, Transesophageal; D005260:Female; D006331:Heart Diseases / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006801:Humans; D010100:Oxygen / Q000097:blood*; D011187:Posture; D013577:Syndrome
chemical_list: D010100:Oxygen