BACKGROUND Cardiopulmonary resuscitation (CPR) requires immediate start of manual chest compression (MCC) and defibrillation as soon as possible. During dental surgery, CPR could be started in the dental chair considering difficulty to move the patient from the dental chair to the floor. However, all types of dental chairs are not stable for MCC. We previously developed a procedure to stabilize a dental chair by using a stool. EUROPEAN RESUSCITATION COUNCIL (ERC) guideline 2015 adopted our procedure when cardiac arrest during dental surgery. The objective of this study was to verify the efficacy of a stool as a stabilizer in different types of dental chairs. METHODS Three health care providers participated in this study, and 8 kinds of dental chairs were examined. MCC were performed on a manikin that was laid on the backrest of a dental chair. A stool was placed under the backrest to stabilize the dental chair. The vertical displacement of the backrest by MCC was recorded by a camcorder and measured by millimeter. Next, the vertical displacement of the backrest by MCC were compared between with and without a stool. RESULTS In all 8 dental chairs, the method by using a stool significantly reduced the vertical displacements of the backrest by during MCC. The reduction ratio (mean [interquartile range]) varied between nearly 27 [20] and 87 [5] %. In the largest stabilization case, the displacement was 3.5 [0.5] mm with a stool versus 26 [5.5] mm without a stool (p <  0.001). CONCLUSIONS Our procedure to stabilize dental chairs by using a stool reduced the displacement of a backrest against MCC in all chairs. CLINICAL RELEVANCE Effective MCC could be performed in dental chairs by using a stool when sudden cardiac arrest occurs during dental surgery.

中文翻译：

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凳子用于稳定牙科椅以进行心肺复苏（CPR）的有用性。

背景技术心肺复苏（CPR）需要立即开始手动胸部按压（MCC）和尽快进行除纤颤。在牙科手术期间，考虑到难以将患者从牙科椅移动到地板上的原因，可以在牙科椅上开始进行CPR。但是，所有类型的牙科椅对于MCC都是不稳定的。我们以前开发了一种通过使用凳子来稳定牙科椅的程序。2015年欧洲复苏委员会（ERC）指南采用了牙科手术中心脏骤停的程序。这项研究的目的是验证粪便作为稳定剂在不同类型的牙科椅中的功效。方法3名医疗保健提供者参加了这项研究，并检查了8种牙科椅。MCC在放置在牙科椅靠背上的人体模型上进行。将凳子放置在靠背下方以稳定牙科椅。MCC记录的靠背的垂直位移由便携式摄像机记录，并以毫米为单位进行测量。接下来，比较在有凳和无凳的情况下，MCC对靠背的垂直位移。结果在所有8个牙科椅中，使用凳子的方法显着减少了MCC期间靠背的垂直位移。减少率（平均[四分位间距]）在近27 [20]和87 [5]％之间变化。在最大的稳定情况下，有大便的位移为3.5 [0.5] mm，无大便的位移为26 [5.5] mm（p <0.001）。结论我们通过使用凳子来稳定牙科椅的程序减少了所有椅子上靠背靠MCC的位移。