Retracted: Chest digital dynamic radiography to detect changes in human pulmonary perfusion in response to alveolar hypoxia

Autor: Shota Yamamoto, Fumio Sakamaki, Genki Takahashi, Yusuke Kondo, Naoya Taguchi, Shogo Esashi, Ryotaro Yuji, Katsuki Murakami, Kensuke Osaragi, Kosuke Tomita, Shunsuke Kamei, Tomohiro Matsumoto, Yutaka Imai, Terumitsu Hasebe
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Journal of Medical Radiation Sciences, Vol 70, Iss 4, Pp e1-e11 (2023)
Druh dokumentu: article
ISSN: 2051-3909
2051-3895
DOI: 10.1002/jmrs.619
Popis: Abstract Introduction Hypoxic pulmonary vasoconstriction optimises oxygenation in the lung by matching the local‐blood perfusion to local‐ventilation ratio upon exposure to alveolar hypoxia. It plays an important role in various pulmonary diseases, but few imaging evaluations of this phenomenon in humans. This study aimed to determine whether chest digital dynamic radiography could detect hypoxic pulmonary vasoconstriction as changes in pulmonary blood flow in healthy individuals. Methods Five Asian men underwent chest digital dynamic radiography before and after 60 sec breath‐holding at the maximal inspiratory level in upright and supine positions. Alveolar partial pressure of oxygen and atmospheric pressure were calculated using the blood gas test and digital dynamic radiography imaging, respectively. To evaluate the blood flow, the correlation rate of temporal change in each pixel value between the lung fields and left cardiac ventricles was analysed. Results Sixty seconds of breath‐holding caused a mean reduction of 26.7 ± 6.4 mmHg in alveolar partial pressure of oxygen. The mean correlation rate of blood flow in the whole lung was significantly lower after than before breath‐holding (before, upright 51.5%, supine 52.2%; after, upright 45.5%, supine 46.1%; both P
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