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Ⅰ.はじめに
われわれは過去に,腰椎変性疾患・頚椎変性疾患における下部尿路症状に関して,国際前立腺症状スコア(International Prostate Symptom Score:IPSS)の有用性を報告してきた26,27).しかし,泌尿器科領域では自覚症状である下部尿路症状(lower urinary tract symptoms:LUTS)と,客観的パラメーターで評価可能である下部尿路機能障害(lower urinary tract disorder:LUTD)を分けて考えるのが一般的で,この両者は必ずしも一致しないとされている17).
当センターでは,2010年1月より手術適応の脊椎変性疾患患者に対し,LUTDの評価として経腹部エコーによる排尿直後の残尿量測定を術前後に行い,知見を蓄積してきている.この評価方法の利点は非侵襲的であることに加え,特殊な器具や技能を用いないため,多くの施設で施行可能な点にある.しかし,検査精度1)や再現性の問題2,17),さらには異常残尿量の定義が各種ガイドライン15-17)によって異なるなど問題点も多く,解釈には注意を要する検査でもある.
本研究は,腰椎疾患領域で残尿量測定を用いた際の再現性を検証し,単回測定での信頼性,残尿量測定の妥当性に関して検討した.
STUDY DESIGN:prospective study
OBJECTIVE:To evaluate repeatability of residual urine(RU)volume measurement(RUM)in patients with lumbar degenerative disorders.
SUMMARY of BACKGROUND DATA:RUM by abdominal echo is a non-invasive modality to evaluate lower urinary tract disorder(LUTD), repeatability of which is not found in urological disorders. Additionally, its repeatability has not been confirmed in spinal disorders. The authors examined repeatability of RUM for evaluation of LUTD in patients with lumbar degenerative disorders.
METHODS:Thirty-four patients with lumbar degenerative disorders and 7 normal adult volunteers entered our study. RUM was performed at least twice(two to seven times;average 3.6 times). According to urological guidelines, RU over 50 cc is defined as abnormal. Thirty-four patients were divided into two groups:the U+group with lower urinary tract lesion(16 patients)and the U−group without such a lesion(18 patients).
RESULTS:In normal adult volunteers:In all volunteers, there was no abnormal RU. Repeatability of RUM was 100%. Average RU volume was 1.6 cc. In patients with lumbar degenerative disorders:Repeatability of RUM was 94.4% in the U−group(average RU volume was 35.2 cc)and 50% in the U+group(average RU volume was 50.1 cc). In all patients with lumbar degenerative disorders, repeatability of RUM was 73.5%(average RU volume was 43.0 cc).
CONCLUSIONS:Repeatability of RUM in patients with lumbar degenerative disorders was 73.5%. Especially, in patients without lower urinary tract lesion, high repeatability of RUM was confirmed. According to the present study, RUM seemed to be a dependable modality to evaluate LUTD in patients with lumbar degenerative disorders.
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