Perioperative medicine: Overview

Abstract
Background: The prevalence of postoperative pain is notably high among the elderly population, which poses significant challenges for their postoperative recovery. In this study, we aimed to identify preoperative predictors for acute and chronic postoperative pain in patients undergoing lumbar spinal surgery through a longitudinal investigation.

Methods: We recruited 75 patients (mean age 68.29 ± 5.60 years) and collected their resting-state electroencephalography (EEG) data two hours before the surgery. The aperiodic and periodic signal components were extracted from the resting-state EEG using the Fitting Oscillations and One-Over-F algorithm. We also collected the preoperative pain ratings, demographic information and the Hospital Anxiety and Depression Scale from all patients. The postoperative pain ratings were collected ten times from Day 1 to Week 12 after surgery.

Results: We observed a high incidence of postoperative acute and chronic pain among older patients. Preoperative pain and peak alpha frequency in resting-state EEG were the primary predictors of acute postoperative pain. Although age is a significant predictor of chronic postoperative pain, its predictive performance is poor.

Conclusions: Overall, our study provides valuable insights into the complex pattern of preoperative EEG features, preoperative pain and age in predicting postoperative pain at different stages. Our findings highlight the significance of exploring preoperative features to identify patients who are at a higher risk of developing severe postoperative pain, which can aid in the development of more personalized and effective pain management strategies.

Significance: The heightened occurrence of postoperative pain among the elderly presents formidable obstacles to their recuperation. This study delves into identifying preoperative factors influencing acute and chronic postoperative pain. Our findings indicate that preoperative pain and peak alpha frequency are crucial predictors of acute postoperative pain. However, the predictive performance for chronic postoperative pain is limited, although age was a significant predictor of chronic postoperative pain. These insights contribute to the identification of patients at elevated risk for severe acute and chronic postoperative pain, offering valuable guidance for pre-surgical risk assessment.

Abstract
Background: Perioperative handoffs are known to present unique challenges to safe and effective patient care. Numerous national accrediting bodies have called for standardized, structured handoff processes. Handoff mnemonics provide a memory aid and standardized structure, as well as promote a shared mental model. We set out to identify perioperative handoff intervention studies that included a handoff mnemonic; critically assess process and patient outcome improvements that support specific mnemonics; and propose future recommendations.

Methods: We conducted a systematic review of the English language perioperative handoff intervention literature designed to identify handoff mnemonic interventions. A comprehensive protocol was developed and registered (CRD42022363615). Searches were conducted using PubMed, Scopus, ERIC (EBSCO), Education Full Text (EBSCO), EMBASE (Elsevier), and Cochrane (January 1, 2010 to May 31, 2022). Pairs of trained reviewers were involved in all phases of the search and extraction process.

Results: Thirty-seven articles with 23 unique mnemonics met the inclusion criteria. Most articles were published after 2015 (29/37; 78%). Situation, Background, Assessment, Recommendation (SBAR), and SBAR variants were used in over half of all studies (22/37; 59%), with 45% (10/22) reporting at least 1 statistically significant process improvement. Seventy percent of handoff mnemonics (26/37) were expanded into lists or checklists. Fifty-seven percent of studies (21/37) reported using an interdisciplinary/interprofessional team to develop the intervention. In 49% of all studies (18/37) at least 1 measurement tool was either previously published or the authors conducting some form of measurement tool validation. Forty-one percent of process measurement tools (11/27) had some form of validation. Although most studies used training/education as an implementation strategy (36/37; 97%), descriptions tended to be brief with few details and no study used interprofessional education. Twenty-seven percent of the identified studies (10/37) measured perception alone and 11% (4/37) measured patient outcomes.

Conclusions: While the evidence supporting one handoff mnemonic over others is weak, SBAR/SBAR variants have been studied more often in the perioperative environment demonstrating some process improvements. A key finding is that 70% of included studies converted their handoff mnemonic to a list or checklist. Finally, given the essential nature of effective handoffs to perioperative patient safety, it is crucial that handoff interventions are well developed, implemented, and evaluated. We propose 8 recommendations for future perioperative handoff mnemonic clinical interventions and research.

Abstract
The Complex Decision Pathway (CDP) is a novel perioperative shared decision-making pathway that was established in the Bay of Plenty, New Zealand in 2018. Unique features of the pathway include the use of a structured communication tool to facilitate a goals-of-care conversation in addition to medical assessment, and the use of a tikanga Māori framework for Māori patients. From May 2019 until May 2022, 81 patients attending the CDP clinic were recruited to a prospective study of their demographics, health status and experience at the time of presentation, along with outcomes and opinions over the subsequent 12 months. Participants were mostly elderly and frail with multiple comorbidities, and just over half of participants chose to undergo surgery. Participants who chose, or were recommended, not to undergo surgery were older, more comorbid and had worse outcomes over the subsequent 12 months. Qualitative data suggested an overall positive patient experience of the pathway, and an economic analysis demonstrated its cost-effectiveness. Overall, the data presented here suggested that the CDP assisted in risk-stratifying patients into operative and non-operative groups, provided a positive patient experience, and was a cost-effective intervention.