Suto Y, Inoue Y
Department of Radiology, Tottori University School of Medicine, Yonago, Japan.
Acta Radiol. 1996 May;37(3 Pt 1):315-20. doi: 10.1177/02841851960371P166.
We attempted to determine the usefulness of high-speed MR imaging for evaluating the severity of sleep apnea syndrome (SAS) by comparing findings of pharyngeal obstruction obtained with high-speed MR with those of all-night polysomnography (PSG).
A total of 33 patients with SAS underwent turbo-FLASH MR examination, while awake and after i.v. injection of hydroxyzine hydrochloride. Serial images were examined by cinemode. Pharyngeal findings on MR were divided into single-site obstruction (SO) at the velopharynx, multiple-site obstruction (MO), and no obstruction (NO). PSG findings were analyzed to determine the predominant type of apnea, severity as evaluated by an apnea index (AI), and the lowest SaO2 value during sleep.
Seventy-five percent of the central apnea group had SO, and 70% of the mixed apneas had MO, while only 15% of the obstructed apneas had MO. The percentage of patients with severe SAS (AI of 20% or higher) was 48% for the SO, and 70% for the MO. The lowest SaO2 value tended to be low in the mixed apnea in the case of PSG, and tended to be low in the MO at MR examination.
Analysis of pharyngeal dynamics using high-speed MR may provide some useful information for evaluating the severity of SAS.
通过比较高速磁共振成像（MR）获得的咽部阻塞结果与整夜多导睡眠图（PSG）的结果，我们试图确定高速MR成像在评估睡眠呼吸暂停综合征（SAS）严重程度方面的实用性。
共有33例SAS患者在清醒状态下及静脉注射盐酸羟嗪后接受了快速扰相梯度回波（turbo-FLASH）MR检查。通过电影模式检查连续图像。MR上的咽部表现分为腭咽单部位阻塞（SO）、多部位阻塞（MO）和无阻塞（NO）。分析PSG结果以确定主要的呼吸暂停类型、通过呼吸暂停指数（AI）评估的严重程度以及睡眠期间的最低动脉血氧饱和度（SaO2）值。
中枢性呼吸暂停组中75%为SO，混合性呼吸暂停组中70%为MO，而阻塞性呼吸暂停组中只有15%为MO。严重SAS（AI为20%或更高）患者中，SO组为48%，MO组为70%。在PSG检查中，混合性呼吸暂停时最低SaO2值往往较低，在MR检查中，MO时最低SaO2值往往较低。
使用高速MR分析咽部动力学可能为评估SAS的严重程度提供一些有用信息。
