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中华肩肘外科电子杂志 ›› 2021, Vol. 09 ›› Issue (04) : 365 -371. doi: 10.3877/cma.j.issn.2095-5790.2021.04.014

论著

优化中国老年患者的术后急性疼痛管理:一项注册观察研究揭示的可改进措施
姜柏林1, 吴雅青1, 王秀丽1, 甘宇1, 魏佩尧1, 冯艺1,()   
  1. 1. 100044 北京大学人民医院麻醉科
  • 收稿日期:2021-08-12 出版日期:2021-11-05
  • 通信作者: 冯艺
  • 基金资助:
    国家重点研发计划(2018YFC2001905); 欧洲共同体第七框架计划FP7/2007-2013(223590)

Improving clinical care of aged patients with acute postoperative pain in China: modifiable parameters revealed by a registering observational study

Bailin Jiang1, Yaqing Wu1, Xiuli Wang1, Yu Gan1, Peiyao Wei1, Yi Feng1,()   

  1. 1. Department of Anesthesiology, Peking University People's Hospital, Beijing 100044, China
  • Received:2021-08-12 Published:2021-11-05
  • Corresponding author: Yi Feng
引用本文:

姜柏林, 吴雅青, 王秀丽, 甘宇, 魏佩尧, 冯艺. 优化中国老年患者的术后急性疼痛管理:一项注册观察研究揭示的可改进措施[J/OL]. 中华肩肘外科电子杂志, 2021, 09(04): 365-371.

Bailin Jiang, Yaqing Wu, Xiuli Wang, Yu Gan, Peiyao Wei, Yi Feng. Improving clinical care of aged patients with acute postoperative pain in China: modifiable parameters revealed by a registering observational study[J/OL]. Chinese Journal of Shoulder and Elbow(Electronic Edition), 2021, 09(04): 365-371.

目的

探索与中国老年人术后急性疼痛相关的可改变因素,从而改进围术期疼痛管理措施。

方法

数据由国际围术期疼痛登记机构PAIN OUT提供,该平台采用标准化的方法来评估疼痛管理及多维度的患者报告结局(patient-reported outcomes,PROs)。利用其中的中国老年人群数据集,采用多因素Logistic回归结合Bootstrap验证建立预测模型。用PROs中的"术后第1天(postoperative day 1,POD1)最严重疼痛"评估患者的术后急性疼痛程度,以出现中至重度疼痛[数字评分法(numeric rating scale,NRS)>3分]为结局指标,以可能影响术后急性疼痛的患者特征、临床数据以及可改变的围术期管理措施为候选预测因子。基于似然比检验,手动逐项删除纳入的指标,保留临床怀疑可能影响结局且P<0.10的因子以消除潜在混杂因素的干扰。

结果

2014年5月至2019年11月,共13家中心的2 244例患者接受了访视,其中455例患者被纳入分析。最终,7个参数进入模型,包括:年龄、BMI、合并慢性疼痛、神经阻滞、切口局部浸润麻醉、术后非甾体类抗炎药(nonsteroidal anti-inflammatory drugs,NSAIDs)应用、获得疼痛治疗信息。模型校准度良好(Hosmer-Lemeshow检验的合并P = 0.215) 。受试者工作特征曲线下面积(area under the receiver operating characteristic curve,AUC)为0.661 (95% CI: 0.611~0.711) 。Bootstrap调整后,AUC为0.660 (95% CI: 0.638~0.682)。切口局部浸润麻醉(P=0.002,OR=0.453,95% CI:0.274~0.749)、术后NSAIDs应用(P=0.008,OR=0.579,95% CI:0.387~0.867)、获得疼痛治疗信息(P=0.003,OR=0.537,95% CI:0.359~0.804)与阻碍术后中重度疼痛的发生显著相关。

结论

本研究揭示了可在临床实践中改进的管理措施,为进一步优化中国老年患者的围术期疼痛管理提供了建议和依据。

Background

More than half of the patients still suffer from moderate to severe postoperative acute pain, which causes not only suffering and interferes with recovery but also is associated with several adverse outcomes, including delirium, complications of the respiratory and circulatory system, and even the development of persistent chronic pain after surgery. Health services for the aged are nowadays an important public health concern in China since more than twenty million old patients underwent surgeries each year. The fragility of this particular population places the old patients at a disadvantage, susceptible to severe adverse effects due to the inappropriate perioperative pain management, which results in high individual and societal costs. The toll of poorly managed postoperative pain in Chinese aged patients will be very high, and resolving pain should be a moral obligation of all healthcare providers. Hence, more effective and safer management of postoperative acute pain is of high priority in aged patients. Though multiple previous studies have reported correlates of postoperative pain, they focused on the predictors for identifying the patients at risk for moderate to severe postoperative pain but neglected to devise practice patterns that might mitigate this risk. Furthermore, the intensity of postoperative acute pain is diverse among different countries and territories in spite of the comparable common risk factors for postoperative pain, that hints the inherent characters exist in a specific population that would account for the differences in the intensity of postoperative acute pain. Therefore, it is critically needed that to infer a predictive model of postoperative acute pain from a selected data set specific to Chinese aged patients which adopts a hierarchical approach guaranteeing a high priority of the modifiable variables. That could change the concepts of perioperative pain management and provide strategies that improve clinical care of Chinese aged patients with postoperative acute pain.

Objectives

To identify perioperative modifiable practice patterns that may provide Chinese aged patients with better care by ameliorating acute postoperative pain.

Methods

Data for this analysis were collected by PAIN OUT quality improvement network, a multinational perioperative pain registry, providing a standardized methodology to assess perioperative pain management practices and multi-dimensional pain-related patient-reported outcomes (PROs) . The international pain outcomes questionnaire (IPO-Q) that was validated in English and has been translated into Chinese by standardized methodology was used to evaluate the PROs. The PAIN OUT methodology for collecting and evaluating perioperative pain on postoperative day 1 (POD1) is registered at ClinicalTrials.gov (NCT02083835) . Approvals were obtained approval for collecting non-identified patient data by all collaborators from the local ethics committees. A data set specific to Chinese aged patients who underwent orthopedic surgery was selected to reduce the influence of potential confounders in this study. Patients could be eligible if they fulfilled the inclusion criteria as follows: (1) underwent any kind of inpatient orthopedic surgery; (2) 65 years or older; (3) were on POD1 and returned to the ward from the post-anesthesia care unit (PACU) for at least six hours; (4) agreed to take part in the survey. Patients whose data about the primary outcome were missing were excluded from this study. The multiple imputation (MI) technique was used to handle random missing data, by which 5 MI data sets were established for the following analysis. Hence the consequential statistics adopted in this study were pooled ones. The outcome was the presence of moderate to severe pain on POD1, which was according to the "worst pain intensity" derived from PROs. The "worst pain intensity" is scored using an 11-point numerical rating scale (NRS, 0=null, 10=worst possible) . In this study, moderate to severe pain was defined as NRS of "worst pain intensity" was more than 3, and an NRS of 3 or less was considered as identifying patients with mild or no pain. Patient characteristics and perioperative clinical data were used as candidate predictors, which comprised gender, age, body mass index (BMI) , psychiatric comorbidities (consisting of schizophrenia, substance abuse of drugs, alcohol use disorder, current smoker, and affective disorders such as depression, anxiety, phobia, post-traumatic stress disorder, and bipolar disorder) , chronic pain (persistent painful condition for 3 months or more or receipt any opioid before the current admission) , type of surgery, perioperative use of regional anesthetic techniques (composed of peripheral neural blockades and neuraxial nerve blockades alike) , intraoperative administration of nonopioid [such as nonsteroidal anti-inflammatory drugs (NSAIDs) , acetaminophen, ketamine, and et al], wound infiltration with local anesthetics, postoperative administration of cyclooxygenase inhibitors, participation in decisions about pain treatment, and receipt of information about pain treatment options. Multivariate logistic regression in combination with bootstrapping techniques was used to infer a model predictive of postoperative acute pain. Briefly, the association between every candidate predictor and the outcome was estimated first by bivariate analysis using the univariate logistic regression. Then besides the pre-selection based on P values, all candidate predictors that were considered as causal variables based on the clinical logic were included in the multivariable logistic regression using an enter modeling. A hierarchical approach in the modeling was adopted in which modifiable variables were of high priority. Then, candidate parameters were manually deleted one by one according to the P-value of the log-likelihood ratio test. To reduce the influence of potential confounders and hold a better competence in prediction, a more liberal P-value was used in this study to keep parameters in the final model. Ultimately, the multivariable model was reduced manually till only predictors with P <0.10 were included. A Hosmer-Lemeshow test was used to estimate the calibration of the final model, and the area under the receiver operating characteristic curve (AUC) was used to evaluate the discrimination. The internal validation was performed using the bootstrapping technique. The BCa method was conducted to draw random bootstrap samples with replacement (1 000 replications) from the MI data sets by which resampling was stratified. The AUC of the adjusted model derived from the bootstrapped data was expected as the estimate of the performance that the prediction model could gain in similar populations.

Results

From May 2014 to November 2019, 2 244 patients from 13 hospitals were approached, of which 455 patients qualified for analysis. 1 751 patients were younger than 65 years old. Twenty-five patients did not give consent to participating in the survey. Thirteen patients were excluded from this study due to the data missing about the primary outcome. The median age of the patients included in the analysis was 70 (67, 76) years old. 292 (64.2%) patients were female, and 163 (35.8%) patients were male. 259 (56.9%) patients suffered from moderate to severe pain after surgery, and 196 (43.1%) patients reported mild or no pain according to the NRS of the "worst pain intensity" derived from PROs. The final model presented accredited reliability and goodness of fit (Hosmer and Lemeshow test P = 0.215) , which included seven parameters that comprised age (P = 0.091, OR=1.03, 95% CI: 1.00-1.06) , body mass index (P = 0.085, OR=0.95, 95% CI: 0.89-1.01) , chronic pain or receipt of opioid pharmacotherapy before admission (P = 0.011, OR=1.68, 95% CI: 1.12-2.51) , perioperative regional anesthesia (P = 0.097, OR=1.43, 95% CI: 0.94-2.18) , wound infiltration (P = 0.002, OR=0.453, 95% CI: 0.274-0.749) , receipt of NSAIDs pharmacotherapy after surgery (P = 0.008, OR=0.579, 95% CI: 0.387-0.867) , receipt of information about pain treatment (P = 0.003, OR=0.537, 95% CI: 0.359-0.804) . Other predictors consisting of gender (P = 0.358) , psychiatric comorbidities (P = 1.000) , type of surgery (P = 0.174) , intraoperative administration of nonopioid (P = 0.010) , and receipt of information about pain treatment options (P = 0.258) , of which some even seemed relevant in the univariable analysis such as intraoperative administration of nonopioid, were no independent predictors in the final multivariable analysis and excluded from the model. The AUC of the final model was 0.661 (95% CI: 0.611-0.711) . After bootstrapping and adjustment for over-optimism or overfitting, the AUC of the adjusted model was quite slightly decreased to 0.660 (95% CI: 0.638-0.682) . Three modifiable practice variables were demonstrated to be associated with decreasing the presence of moderate to severe pain on POD1 significantly, which consisted of wound infiltration, receipt of NSAIDs pharmacotherapy after surgery, and receipt of information about pain treatment.

Conclusio

n More than half of the Chinese age patients suffer from moderate to severe acute pain after orthopedic surgery, in spite of the progressive understanding of the physiology of postoperative pain and the development of lots of new analgesia procedures. The presented analysis revealed modifications that can be implemented in clinical practice and may improve postoperative acute pain management of the Chinese aged patients who underwent orthopedic surgery. Since the detailed type of surgery did not impact significantly on the outcome of the worst pain intensity on POD1, it might be rational to generalize to the Chinese aged patients undergoing other major procedures, though further studies will be necessary to confirm that.

表1 两组患者的一般资料及围术期处理比较
图1 患者的纳入及排除情况注:NRS为数字评分法
表2 中国老年患者骨科术后中至重度急性疼痛预测模型
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