Olfactory bulb volume and depth of olfactory sulcus in patients with idiopathic olfactory loss
Olfactory loss is considered as idiopathic (IOL) when no cause can be found, neither on the basis of a standardized history nor a thorough clinical evaluation. Olfactory bulb volume (OB) has been shown to be decreased in patients with olfactory loss due to trauma, infections, or sinonasal disease. However, OB volume has not yet been investigated in IOL patients. Twenty-two patients with IOL were compared with 22 controls in terms of olfactory performance and of OB volume assessed with magnetic resonance imaging (MRI). Psychophysical testing conWrmed that patients had lower scores than controls: P < 0.001 for threshold (T), discrimination (D), identiWcation (I) and global TDI score. Mean right, left and total OB volumes were signiWcantly smaller for IOL patients as compared to controls. Both for IOL and controls, there was a signiWcant correlation between odor thresholds and total OB volume, respectively. In conclusion, patients with IOL have decreased olfactory function and decreased OB volume when compared with controls. This was previously demonstrated for patients with postinfectious or posttraumatic olfactory dysfunction, but not for patients with uneventful conditions possibly damaging their olfactory apparatus.
在沒有標準病史或全面臨床評估的情況下,嗅覺喪失被認為是特發性(先天性)(IOL)。由於外傷、感染或鼻腔疾病而導致嗅覺喪失的患者,其嗅球體積(OB)已被證實降低。然而,在先天性嗅覺喪失患者中尚未研究過嗅球體積。22名先天性嗅覺喪失患者與22名對照組在嗅覺表現和磁共振成像(MRI)評估嗅球體積(OB)方面進行了比較。心理物理測試結果顯示,實驗組在閾值(T)、鑑別(D)、鑑別(I)和整體TDI評分上均低於對照組P<0.001。與對照組相比,先天性嗅覺喪失患者的平均左右嗅球體積(OB)和總嗅球體積(OB)均顯著減小。在先天性嗅覺喪失患者和對照組中,氣味閾值和總嗅球體積(OB)分別有顯著相關性。總之,與對照組相比,先天性嗅覺喪失患者的嗅覺功能下降,嗅球體積(OB)減小。這一結果以前被證實是針對感染後或創傷後嗅覺功能障礙的患者,而不是針對可能損傷其嗅覺器官的正常情況的患者。
doi: 10.1007/s00405-010-1230-2
Journal: Eur Arch Otorhinolaryngol
Published date:19 March 2010
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