Pituitary:垂体腺瘤切除术后检测ACTH或可准确预测库欣病缓解

2018-09-22 国际糖尿病编辑部 国际糖尿病

根据发表在Pituitary上的一项研究,在垂体腺瘤切除术后不久进行血浆促肾上腺皮质激素(ACTH)抑制试验或可准确预测库欣病的短期和长期缓解。

根据发表在Pituitary上的一项研究,在垂体腺瘤切除术后不久进行血浆促肾上腺皮质激素(ACTH)抑制试验或可准确预测库欣病的短期和长期缓解。

瑞典隆德大学斯肯恩大学医院Erik Uvelius指出,库欣病是由垂体腺瘤分泌过多ACTH引起,导致皮质醇增多症。手术切除腺瘤是该病的一线治疗方法。根据腺瘤大小、术前MRI发现以及外科医生经验等因素,患者术后缓解率在43%~95%。然而,在确定或预测库欣病随时间缓解的实验室检测指标和生化阈值方面,目前尚未达成共识

研究者回顾性收集了28例库欣病患者的病例数据,这些患者共接受了45次经蝶入路腺瘤切除术。患者在术后第2天和第3天口服倍他米松(上午8点、下午2点和晚上8点分别口服1 mg、0.5 mg、0.5 mg)。研究者在患者服用倍他米松之前以及服用后第24小时和第48小时检测其血浆皮质醇和ACTH水平,并在术后第3天检测24小时尿游离皮质醇水平。

在术后3个月和之后每年,患者接受清晨血浆皮质醇和ACTH以及尿游离皮质醇检测和/或低剂量地塞米松抑制试验。研究者将疾病缓解定义为临床症状和皮质醇增多症症状的减轻,并经各种实验室检测指标所证实。

研究者使用尤登指数建立预测短期(3个月)和长期(5年或更长时间)缓解情况的最高灵敏度和特异性的界值。通过曲线下面积(AUC)评估不同检测的临床准确性。

研究人群主要为女性(71%),中位年龄49.5岁。接受初次手术与再次手术的患者在年龄、性别或术式方面没有显著差异。其中2例患者诊断为垂体腺癌,11例诊断为垂体大腺瘤。在所有腺瘤中均发现ACTH阳性,病理证实2例为产生ACTH的腺癌。

28例患者中,12例(43%)在最后随访时出现长期缓解。3例患者在初次手术后未缓解,但被认为不适合接受再次手术。13例接受再次手术的患者解决了残留疾病或仍复发。4例患者在第2次或第3次手术后出现了长期缓解,相当于16例(57%)患者实现了长期缓解。

研究者发现,在使用倍他米松24小时和48小时后,血浆皮质醇水平预测短期和长期缓解最有效。预测短期缓解的界值107 nmol/L,敏感性为0.85,特异性为0.94,阳性预测值为0.96,AUC为0.92(95%CI:0.85~1)。预测短期缓解的界值49 nmol/L,敏感性为0.94,特异性为0.93,阳性预测值为0.88,AUC为0.98(95%CI:0.95~1),该界值与库欣病诊断界值(50 nmol/L)接近。研究者表示,若采用25 nmol/L的严格界值,会导致真阳性率较低,假阴性率较高。

研究者指出,库欣病经蝶入路术后第2天和第3天进行48小时倍他米松抑制试验,可以安全预测短期和长期缓解,且准确度很高。倍他米松抑制24小时后的血浆皮质醇水平在预测5年缓解方面表现出最佳的准确性。

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    2018-09-26 清风拂面

    谢谢分享学习

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    2018-09-24 chendoc244
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