Risk Factors of Postoperative Delirium in Older Adult Spine Surgery Patients: A Meta-Analysis

Prognostic Nutritional Index and the Risk of Postoperative Complications After Spine Surgery: A Meta-Analysis

BACKGROUND

A low prognostic nutritional index (PNI) may reflect malnutrition, which has been associated with poor prognosis in patients with various clinical conditions. The aim of the systematic review and meta-analysis was to investigate the association between preoperative PNI and risk of postoperative complications in adult patients after spine surgery.

METHODS

An extensive search was conducted on PubMed, Embase, and Web of Science to identify relevant cohort studies. Random-effects models were employed to combine the findings, taking into account the potential influence of heterogeneity.

RESULTS

Ten cohort studies involving 3,249 patients receiving spine surgeries were included. Pooled results showed that a low preoperative prognostic nutritional index (PNI) was associated with an increased risk of overall postoperative complications in these patients (odds ratio [OR]: 1.82, 95% confidence interval [CI]: 1.42 to 2.34, P < 0.001; I2 = 49%). Specifically, a preoperative malnutrition as evidenced by a low PNI was associated with a higher incidence of postoperative delirium (OR: 2.36, 95% CI: 1.52 to 3.66, P < 0.001; I2 = 38%) and surgical site infection (OR: 1.41, 95% CI: 1.15 to 1.73, P = 0.001; I2 = 0%). Sensitivity analyses by excluding one study at a time did not significantly change the results (P all <0.05).

CONCLUSIONS

A preoperative low prognostic nutritional index (PNI) may be a risk factor of increased incidence of overall postoperative complications, postoperative delirium, and surgical site infection in adult patients after spine surgeries.

Association between preoperative neutrophil-lymphocyte ratio, uric acid, and postoperative delirium in elderly patients undergoing degenerative spine surgery

PURPOSE

There are few reports regarding the association between the neutrophil-lymphocyte ratio (NLR), uric acid, and the development of postoperative delirium (POD) in patients who are undergoing spine surgeries. We investigated the associations between the NLR, uric acid as a natural antioxidant, and POD in elderly patients undergoing degenerative spine surgery.

PATIENTS AND METHODS

This was a single-center, observational, and retrospective study conducted in Japan. We enrolled 410 patients who underwent degenerative spine surgery. POD was diagnosed after the surgeries by psychiatrists, based on the 5th edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-V). We performed a multivariable logistic regression analysis to clarify whether the NLR and uric acid values were associated with the development of POD in the patients.

RESULTS

129 of the 410 patients were excluded from the analysis. Of the 281 patients (137 females, 144 males), 32 patients (11.4%) were diagnosed with POD. The multivariable logistic regression analysis revealed that the preoperative uric acid level (adjusted odds ratio [aOR]: 0.67, 95% confidence interval [CI]: 0.49-0.90, p = 0.008) and age (aOR: 1.09, 95% CI: 1.02-1.16, p = 0.008) were significantly associated with POD. The preoperative NLR (aOR: 0.82, 95% CI: 0.60-1.13, p = 0.227) and antihyperuricemic medication (aOR: 0.97, 95% CI: 0.24-3.82, p = 0.959) were not significantly associated with POD.

CONCLUSION

Our results demonstrated that in elderly patients undergoing degenerative spine surgery, the preoperative NLR was not significantly associated with POD, but a lower preoperative uric acid value was an independent risk factor for developing POD. Uric acid could have a neuroprotective impact on POD in patients with degenerative spine diseases.

Thoracic delirium index for predicting postoperative delirium in elderly patients following thoracic surgery: A retrospective case-control study

BACKGROUND

Postoperative delirium (POD) is an acute neurological complication in the elderly undergoing thoracic surgery and can result in serious adverse consequences.

AIMS

This study aimed to identify the related risk factors for POD following thoracic surgery, primarily focusing on preoperative serum biomarkers, and further to establish a novel delirium index to better predict POD.

METHODS

A total of 279 patients aged ≥60 years who underwent elective thoracic surgery from August 2021 to August 2022 were enrolled in this observational study. The platelet-to-white blood cell ratio (PWR) was calculated as number the of platelets divided by the number of white blood cells. POD was defined by the confusion assessment method twice daily during the postoperative first 3 days. Multivariate regression analysis was performed to identify all potential variables for POD. Moreover, a novel thoracic delirium index (TDI) was developed based on the related risk factors. The accuracy of TDI and its component factors in predicting POD was determined by the curve of receiver operating characteristic (ROC).

RESULTS

In total, 25 of 279 patients developed POD (8.96%). Age, PWR, and average pain scores within the first 3 days after surgery were regarded as the independent risk factors for POD. Moreover, the ROC analysis showed the TDI, including age, PWR, and average pain scores within the first 3 days after surgery, can more accurately predict POD with the largest area under the curve of 0.790 and the optimal cutoff value of 9.072, respectively.

CONCLUSION

The TDI can scientifically and effectively predict POD to provide optimal clinical guidance for older patients after thoracic surgery.

Correlation between burst suppression and postoperative delirium in elderly patients: a prospective study

OBJECTIVE

To explore the correlation between intraoperative burst suppression (BS) and postoperative delirium (POD) in elderly patients, and provide more ideas for reducing POD in clinical.

METHODS

Ninety patients, aged over 60 years, who underwent lumbar internal fixation surgery in our hospital were selected. General information of patients was obtained and informed consent was signed during preoperative visits. Patients were divided into burst suppression (BS) group and non-burst suppression (NBS) group by intraoperative electroencephalogram monitoring. Intraoperative systolic blood pressure (SBP), diastolic blood pressure (DBP), mean arterial pressure (MAP), and heart rate (HR) were recorded, and the variation and minimum value were obtained by calculating. Hemoglobin (HGB), C-reactive protein (CRP), system immune inflammatory index (SII) at 24 and 72 h after surgery, the incidence of postoperative adverse reactions, postoperative hospital stay, and total cost were recorded after operation. POD assessment was performed using CAM within 7 days after surgery or until discharge. SPSS25.0 was used for statistical analysis.

RESULTS

Compared with the NBS group, the number of elderly patients with high frailty level in BS group was more (P = 0.048). There is correlation between BS and POD (OR: 4.954, 95%CI 1.034-23.736, P = 0.045), and most of the POD patients in BS group behave as hyperactive type.

CONCLUSION

The occurrence of intraoperative BS is associated with POD, and elderly patients with frailty are more likely to have intraoperative BS. BS can be used as a predictor of POD.

Assessment of Risk Factors for Postoperative Delirium in Older Adults Who Underwent Spinal Surgery and Identifying Associated Biomarkers Using Exosomal Protein

PURPOSE

With an increase in the aging population, the number of patients with degenerative spinal diseases undergoing surgery has risen, as has the incidence of postoperative delirium. This study aimed to investigate the risk factors affecting postoperative delirium in older adults who had undergone spine surgery and to identify the associated biomarkers.

METHODS

This study is a prospective study. Data of 100 patients aged ≥ 70 years who underwent spinal surgery were analyzed. Demographic data, medical history, clinical characteristics, cognitive function, depression symptoms, functional status, frailty, and nutritional status were investigated to identify the risk factors for delirium. The Confusion Assessment Method, Delirium Rating Scale-R-98, and Nursing Delirium Scale were also used for diagnosing delirium. To discover the biomarkers, urine extracellular vesicles (EVs) were analyzed for tau, ubiquitin carboxy-terminal hydrolase L1 (UCH-L1), neurofilament light, and glial fibrillary acidic protein using digital immunoassay technology.

RESULTS

Nine patients were excluded, and data obtained from the remaining 91 were analyzed. Among them, 18 (19.8%) developed delirium. Differences were observed between participants with and without delirium in the contexts of a history of mental disorder and use of benzodiazepines (p = .005 and p = .026, respectively). Tau and UCH-L1-concentrations of urine EVs-were comparatively higher in participants with severe delirium than that in participants without delirium (p = .002 and p = .001, respectively).

CONCLUSION

These findings can assist clinicians in accurately identifying the risk factors before surgery, classifying high-risk patients, and predicting and detecting delirium in older patients. Moreover, urine EV analysis revealed that postoperative delirium following spinal surgery is most likely associated with brain damage.

Family Presence May Reduce Postoperative Delirium After Spinal Surgery

ABSTRACT

BACKGROUND: Delirium is associated with worse outcomes, but there is a gap in literature identifying nurse-led interventions to reduce delirium in postoperative (postop) surgical spine patients. Because family presence has been associated with a variety of beneficial effects, we aimed to examine whether family presence in the spine intensive care unit (ICU) during the night after surgery was associated with less confusion or delirium on postop day 1. METHODS: This is a prospective nonrandomized pilot clinical trial with pragmatic sampling. Group designation was assigned by natural history. The family-present group was designated as patients for whom a family member remained present during the first night after surgery. The unaccompanied group was designated as patients who did not have a family member stay the night. Data include the Richmond Agitation Sedation Scale, the Confusion Assessment Method for the ICU, the 4AT (Alertness, Attention, Abbreviated mental test, and Acute change) score, and confusion measured with the orientation item on the Glasgow Coma Scale. Baseline data were collected after admission to the spine ICU and compared with the same data collected in the morning of postop day 1. RESULTS: At baseline, 5 of 16 patients in the family-present group (31.3%) had at least 1 incidence of delirium or confusion. Similarly, 6 of 14 patients in the unaccompanied group (42.9%) had at least 1 incidence of delirium or confusion. There was a clinically relevant, but not statistically significant, reduction in postop day 1 delirium or confusion comparing the family-present (6.3%) and unaccompanied (21.4%) groups ( P = .23). CONCLUSION: Family presence may reduce delirium and confusion for patients after spine surgery. The results support continued research into examining nurse-led interventions to reduce delirium and improve outcomes for this population.

Preoperative Serum Albumin Level Predicts Length of Stay and Perioperative Adverse Events Following Vertebral Corpectomy and Posterior Stabilization for Metastatic Spine Disease

STUDY DESIGN

Retrospective review of a prospectively collected national database.

OBJECTIVES

To determine the association between preoperative serum albumin levels and perioperative adverse events (AEs) following vertebral corpectomy and posterior stabilization for metastatic spine disease.

METHODS

The 2010 to 2019 American College of Surgeons' National Surgical Quality Improvement (ACS-NSQIP) database was used to identify all patients undergoing vertebral corpectomy and posterior stabilization for metastatic spine disease. Receiver operative characteristic (ROC) curve analysis was used to determine preoperative serum albumin cut-off values for predicting perioperative AEs. Low preoperative serum albumin was defined as serum albumin below this cut-off value.

RESULTS

A total of 301 patients were included in the study. ROC curve analysis demonstrated serum albumin < 3.25 g/dL as a cut-off value for predicting perioperative AEs. The low serum albumin group had a higher overall perioperative AEs (P = .041), longer post-operative LOS (P < .001), higher 30-day reoperation rate (P = .014), and a higher in-hospital mortality rate (P = .046). Multivariate analysis demonstrated that low preoperative serum albumin was associated with higher perioperative AEs.

CONCLUSIONS

Low serum albumin level is associated with higher perioperative AEs, longer postoperative LOS, and higher rates of 30-day reoperation and in-hospital mortality among patients undergoing vertebral corpectomy and posterior stabilization for metastatic spine disease. Strategies to improve preoperative nutritional status in patients undergoing this procedure may improve these perioperative outcome measures within this surgical population.

LEVEL OF EVIDENCE

III.

Incidence of New Onset Dementia and Health Care Utilization Following Spine Fusions: A Propensity Score Matching Analysis

BACKGROUND

Dementia following spine fusions is not described in the literature. Also, the impact of new onset dementia on long-term health care utilization is not described. The aim of our study was to define the incidence of new onset dementia and its long-term health care utilization in elderly patients.

MATERIALS AND METHODS

MarketScan database were queried using the ICD-9/10 and CPT 4^th edition, from 2001 to 2019. We included patients ≥ 55 of age who underwent spine fusions with at least 5 years follow-up. Outcomes were new onset dementia (> 6 months after the procedure) length of stay (LOS), discharge disposition, hospital re-admissions, outpatient services, and medication refills.

RESULTS

Of 45,129 patients who underwent spine fusions, 1283 patients (2.84%) were diagnosed to have new-onset dementia. There was no difference in the re-operation rates among the dementia and non-dementia cohort at 1-, 2- and 5-years following the index procedure. Patients in the dementia cohort incurred higher number of hospital re-admissions up to 5-years after the index procedure. In terms of combined index procedure and post-discharge utilization payments, significant differences were noted among the dementia vs. non-dementia cohorts at 5-years ($126,628 vs. $ 77,098), following the index procedure.

CONCLUSION

Elderly age, higher comorbidities, Medicare insurance, multi-level lumbosacral fusions were identified as risk markers for developing dementia following spine fusions. Dementia resulted in significantly higher health care utilization with no increased rate of re-operations for up to 5-years following the index procedure.

Risk factors for delirium in elderly patients after lumbar spinal fusion

OBJECTIVE

To identify perioperative risk factors for postoperative delirium (POD) in patients aged 65 or older undergoing lumbar spinal fusion procedures.

PATIENTS AND METHODS

A retrospective cohort analysis was performed on patients undergoing lumbar spinal fusion over an approximately three-year period at a single institution. Demographic and perioperative data were obtained from electronic medical records. The primary outcome was the presence of postoperative delirium assayed by the Delirium Observation Screening Scale (DOSS) and Confusion Assessment Method for the ICU (CAM-ICU). Univariate and multivariate analyses were performed on the data.

RESULTS

Of the 702 patients included in the study, 173 (24.6%) developed POD. Our analysis revealed that older age (p < 0.001), lower preoperative hemoglobin (p < 0.001), and higher ASA status (p < 0.001), were significant preoperative risk factors for developing POD. The only significant intraoperative risk factor was a higher number of spinal levels that were instrumented (p < 0.001). Higher pain scores on postoperative day 1 (p < 0.001), and lower postoperative hemoglobin (p < 0.001) were associated with increased POD; as were ICU admission (p < 0.001) and increased length of ICU stay (p < 0.001). Patients who developed POD had a longer hospital stay (p < 0.001) with lower rates of discharge to home as opposed to an inpatient facility (p < 0.001).

CONCLUSION

Risk factors for POD in older adults undergoing lumbar spinal fusion surgery include advanced age, diabetes, lower preoperative and postoperative hemoglobin, higher ASA grade, greater extent of surgery, and higher postoperative pain scores. Patients with delirium had a higher incidence of postoperative ICU admission, increased length of stay, decreased likelihood of discharge to home and increased mortality, all consistent with prior studies. Further studies may determine whether adequate management of anemia and pain lead to a reduction in the incidence of postoperative delirium in these patients.

Recent advances and perspectives of postoperative neurological disorders in the elderly surgical patients

Postoperative neurological disorders, including postoperative delirium (POD), postoperative cognitive dysfunction (POCD), postoperative covert ischemic stroke, and hemorrhagic stroke, are challenging clinical problems in the emerging aged surgical population. These disorders can deteriorate functional outcomes and long‐term quality of life after surgery, resulting in a substantial social and financial burden to the family and society. Understanding predisposing and precipitating factors may promote individualized preventive treatment for each disorder, as several risk factors are modifiable. Besides prevention, timely identification and treatment of etiologies and symptoms can contribute to better recovery from postoperative neurological disorders and lower risk of long‐term cognitive impairment, disability, and even death. Herein, we summarize the diagnosis, risk factors, prevention, and treatment of these postoperative complications, with emphasis on recent advances and perspectives.

Perioperative Care of Patients Undergoing Major Complex Spinal Instrumentation Surgery: Clinical Practice Guidelines From the Society for Neuroscience in Anesthesiology and Critical Care

Evidence-based standardization of the perioperative management of patients undergoing complex spine surgery can improve outcomes such as enhanced patient satisfaction, reduced intensive care and hospital length of stay, and reduced costs. The Society for Neuroscience in Anesthesiology and Critical Care (SNACC) tasked an expert group to review existing evidence and generate recommendations for the perioperative management of patients undergoing complex spine surgery, defined as surgery on 2 or more thoracic and/or lumbar spine levels. Institutional clinical management protocols can be constructed based on the elements included in these clinical practice guidelines, and the evidence presented.