Bentsen B, Svensson P, Wenzel A
Department of Oral Radiology, Royal Dental College, University of Aarhus, Vennelyst Boulevard, DK-8000 Arhus C, Denmark.
Anesth Prog. 2000 Summer;47(3):67-71.
The first aim of the study was to evaluate whether it was possible to manipulate the distraction effect induced by 3-D video glasses on the perceived pain and unpleasantness of the subjects by giving them different information about the expected effect. Second, the study aimed to determine the reproducibility of the effect. Forty-five students enrolled, 39 students participated in the study (24 women and 15 men, median age 23 years, range 19-28 years) because 6 did not show up for the first trial, and 37 completed the study because 2 subjects did not show up for the second trial. The subjects were randomized into 3 groups, balanced with respect to age and sex, that received different information about the effect of 3-D video on pain and unpleasantness: the first group received positive information, the second group received neutral information, and the third group received negative information. Once assigned to a group, there were no crossovers between the groups. A cold pressor stimulus was used to induce experimental pain, and the volunteers rated the intensity of pain and unpleasantness on 100-mm visual analogue scales. A new generation of video glasses were used in the study. Each volunteer was exposed to the cold pressor test in 2 randomized trials (video and control) after the information was given, and the 2 trials were repeated in a second session after 4 weeks. There was no significant difference in the effect of video glasses on perceived pain (P = .74) nor on the perceived unpleasantness (P = .84) among the 3 information groups. The data were therefore pooled. The results of the pooled data showed a significant effect of 3-D video on perceived pain (P = .03) but not on unpleasantness (P = .18). After 4 weeks, the study was repeated, and there were no significant changes in the effect of video glasses. The median visual analogue scale scores were reduced in both the video and the control trials compared with the first session.
该研究的首要目的是评估，通过向受试者提供有关预期效果的不同信息，是否有可能操控3D视频眼镜对受试者感知到的疼痛和不适感所产生的分心效应。其次，该研究旨在确定这种效应的可重复性。45名学生报名参加，39名学生参与了研究（24名女性和15名男性，年龄中位数23岁，范围19 - 28岁），因为6名学生未参加首次试验，37名学生完成了研究，因为2名受试者未参加第二次试验。受试者被随机分为3组，在年龄和性别方面保持均衡，他们收到了关于3D视频对疼痛和不适感影响的不同信息：第一组收到积极信息，第二组收到中性信息，第三组收到消极信息。一旦被分配到一个组，各小组之间不存在交叉情况。使用冷加压刺激来诱发实验性疼痛，志愿者在100毫米视觉模拟量表上对疼痛强度和不适感进行评分。该研究使用了新一代视频眼镜。在提供信息后，每位志愿者在2次随机试验（视频试验和对照试验）中接受冷加压测试，4周后在第二阶段重复这2次试验。在3个信息组中，视频眼镜对感知到的疼痛（P = 0.74）和感知到的不适感（P = 0.84）的影响没有显著差异。因此将数据合并。合并后的数据结果显示，3D视频对感知到的疼痛有显著影响（P = 0.03），但对不适感没有影响（P = 0.18）。4周后，重复该研究，视频眼镜的效果没有显著变化。与第一阶段相比，视频试验和对照试验中的视觉模拟量表评分中位数均有所降低。
