A prospective,observational study of cerebrovascular autoregulation and its association with delirium following cardiac surgery

This aim of this prospective observational cohort study was to evaluate any association between postoperatively impaired cerebrovascular autoregulation and the onset of delirium following cardiac surgery. Previous studies have shown that impaired intra-operative cerebrovascular autoregulation during cardiopulmonary bypass is associated with delirium. However, postoperative changes in cerebrovascular autoregulation and its association with delirium have not been investigated. One-hundred and eight consecutive adult cardiac surgical patients without baseline cognitive dysfunction or aphasia were included in the study. Cerebrovascular autoregulation was assessed by the Pearson correlation between near-infrared spectroscopy-derived cerebral tissue oxygen saturation and mean arterial pressure to derive the tissue oximetry index. Cerebrovascular autoregulation was monitored for a minimum of 90 min on postoperative day 0 and postoperative day 1. Delirium was assessed throughout intensive care unit admission using the confusion assessment method for the intensive care unit. We observed delirium in 24 of the 108 patients studied. The mean (SD) tissue oximetry index was higher in delirious patients on postoperative day 0 compared with non-delirious patients; 0.270 (0.199) vs. 0.180 (0.142), p = 0.044, but not on postoperative day 1; 0.130 (0.160) vs. 0.150 (0.130), p = 0.543. All patients showed improvement in tissue oximetry index on postoperative day 1 compared with postoperative day 0. Logistic regression analysis demonstrated tissue oximetry index on postoperative day 0 to be independently associated with delirium; odds ratio 1.05 (95%CI 1.01–1.10), p = 0.043. In conclusion, we found an association between impaired cerebrovascular autoregulation, measured by near-infrared spectroscopy, and delirium in the early postoperative period.     

A pilot study of cerebral tissue oxygenation and postoperative cognitive dysfunction among patients undergoing coronary artery bypass grafting randomised to surgery with or without cardiopulmonary bypass*

Coronary artery bypass surgery, performed with or without cardiopulmonary bypass, is frequently followed by postoperative cognitive decline. Near‐infrared spectroscopy is commonly used to assess cerebral tissue oxygenation, especially during cardiac surgery. Recent studies have suggested an association between cerebral desaturation and postoperative cognitive dysfunction. We therefore studied cerebral oxygen desaturation, defined as area under the cerebral oxygenation curve < 40% of > 10 min.%, with respect to cognitive performance at 4 days (early) and 3 months (late) postoperatively, compared with baseline, using a computerised cognitive test battery. We included 60 patients, of mean (SD) age 62.8 (9.4) years, scheduled for elective coronary artery bypass grafting, who were randomly allocated to surgery with or without cardiopulmonary bypass. Cerebral desaturation occurred in only three patients and there was no difference in cerebral oxygenation between the two groups at any time. Among patients who received cardiopulmonary bypass, 18 (62%) had early cognitive decline, compared with 16 (53%) in the group without cardiopulmonary bypass (p = 0.50). Three months after surgery, 11 patients (39%) in the cardiopulmonary bypass group displayed cognitive dysfunction, compared with four (14%) in the non‐cardiopulmonary bypass group (p = 0.03). The use of cardiopulmonary bypass was identified as an independent risk factor for the development of late cognitive dysfunction (OR 6.4 (95% CI 1.2–33.0) p = 0.027. In conclusion, although cerebral oxygen desaturation was rare in our population, postoperative cognitive decline was common in both groups, suggesting that factors other than hypoxic neuronal injury are responsible.     

Prediction of cognitive dysfunction and patients' outcome following valvular heart surgery and the role of cerebral oximetry.

OBJECTIVE: Postoperative cognitive dysfunction (POCD) commonly develops after cardiac surgery affecting patients' outcome. Cerebral oximetry noninvasively measures regional cerebral oxygen saturation (rSO(2)) and significant correlation has been reported between intraoperative cerebral desaturation and POCD, as well as patients' outcome following coronary artery bypass grafting. However, evidence is limited in valvular heart surgery (VHS). We investigated the relationship of intraoperative rSO(2) values with POCD and length of postoperative hospitalization in patients undergoing VHS. METHODS: One hundred patients undergoing elective VHS were enrolled. Neurocognitive evaluation was performed with Mini-Mental State Examination, Trail-Making Test (Part A), and Grooved Pegboard Test at 1 day before and 7th day after surgery. During surgery, rSO(2) was continuously monitored and the incidence and duration of decrease in rSO(2) values for five consecutive minutes were recorded as follows; (1) decrease in absolute rSO(2) values to less than 50%, (2) 40%, and (3) a 20% decrease compared to baseline value. RESULTS: Twenty-three patients (23%) demonstrated POCD. We could not observe any significant differences in either the incidence or duration of decrease in rSO(2) values between patients with and without POCD. Low education level and higher baseline temperature had significant correlation with POCD. Patients with cerebral desaturation required significantly longer postoperative hospitalization. CONCLUSION: In patients undergoing VHS, POCD could not be predicted with cerebral oximetry. However, patients with intraoperative cerebral desaturation required significantly longer postoperative hospitalization and cerebral oximetry appears to be promising in terms of monitoring the brain as the index organ for systemic perfusion and improving patients' outcome.     

The effect of peri-operative dexmedetomidine on the incidence of postoperative delirium in cardiac and non-cardiac surgical patients: a randomised,double-blind placebo-controlled trial

Delirium occurs commonly following major non-cardiac and cardiac surgery and is associated with: postoperative mortality; postoperative neurocognitive dysfunction; increased length of hospital stay; and major postoperative complications and morbidity. The aim of this study was to investigate the effect of peri-operative administration of dexmedetomidine on the incidence of postoperative delirium in non-cardiac and cardiac surgical patients. In this randomised, double-blind placebo-controlled trial we included 63 patients aged ≥ 60 years undergoing major open abdominal surgery or coronary artery bypass graft surgery with cardiopulmonary bypass. The primary outcome was the incidence of postoperative delirium, as screened for with the Confusion Assessment Method. Delirium assessment was performed twice daily until postoperative day 5, at the time of discharge from hospital or until postoperative day 14. We found that dexmedetomidine was associated with a reduced incidence of postoperative delirium within the first 5 postoperative days, 43.8% vs. 17.9%, p = 0.038. Severity of delirium, screened with the Intensive Care Delirium Screening Checklist, was comparable in both groups, with a mean maximum score of 1.54 vs. 1.68, p = 0.767. No patients in the dexmedetomidine group died while five (15.6%) patients in the placebo group died, p = 0.029. For patients aged ≥ 60 years undergoing major cardiac or non-cardiac surgery, we conclude that the peri-operative administration of dexmedetomidine is associated with a lower incidence of postoperative delirium.     

Cerebral oxygenation in patients undergoing shoulder surgery in beach chair position: Comparing general to regional anesthesia and the impact on neurobehavioral outcome

BackgroundIschemic brain damage has been reported in healthy patients after beach chair position for surgery due to cerebral hypoperfusion. Near-infrared spectroscopy has been described as a non-invasive, continuous method to monitor cerebral oxygen saturation. However, its impact on neurobehavioral outcome comparing different anesthesia regimens has been poorly described.MethodsIn this prospective, assessor-blinded study, 90 patients undergoing shoulder surgery in beach chair position following general (G-group, n = 45) or regional anesthesia (R-group; n = 45) were enrolled to assess the prevalence of cerebral desaturation events comparing anesthesia regimens and their impact on neurobehavioral and neurological outcome. Anesthesiologists were blinded to regional cerebral oxygen saturation values. Baseline data assessed the day before surgery included neurological and neurobehavioral tests, which were repeated the day after surgery. The baseline data for regional cerebral oxygen saturation/bispectral index and invasive blood pressure both at heart and auditory meatus levels were taken prior to anesthesia, 5 min after induction of anesthesia, 5 min after beach chair positioning, after skin incision and thereafter all 20 min until discharge.ResultsPatients in the R-group showed significantly less cerebral desaturation events (p < 0.001), drops in regional cerebral oxygen saturation values (p < 0.001), significantly better neurobehavioral test results the day after surgery (p < 0.001) and showed a greater hemodynamic stability in the beach chair position compared to patients in the G-group.ConclusionsThe incidence of regional cerebral oxygen desaturations seems to influence the neurobehavioral outcome. Regional anesthesia offers more stable cardiovascular conditions for shoulder surgery in beach chair position influencing neurobehavioral test results at 24 h.     

Postoperative kidney oxygen saturation as a novel marker for acute kidney injury after adult cardiac surgery

ObjectiveAcute kidney injury is a severe complication and one of the stronger risk factors for death in patients undergoing cardiac surgery. The relationship between postoperative brain oxygen saturation and kidney oxygen saturation with acute kidney injury in adults undergoing cardiac surgery has not been determined. We designed a single-center prospective study to determine if the continuous monitoring of postoperative brain oxygen saturation and kidney oxygen saturation could predict postoperative acute kidney injury.MethodsWe conducted a prospective open cohort study from January to September 2017. The primary outcome was postoperative acute kidney injury using the Kidney Disease: Improving Global Outcomes criteria. Brain oxygen saturation and kidney oxygen saturation, the metrics of which were area measurements (%-min), were recorded during the surgery and the first 48 hours after the cardiac procedure. Receiver operating characteristic curve analysis was used to evaluate the predictive power of kidney oxygen saturation for acute kidney injury.ResultsA total of 121 consecutive patients were enrolled. Thirty-five patients (28.9%) developed acute kidney injury. Brain oxygen saturation showed no statistical difference in both groups; however, kidney oxygen saturation was related to acute kidney injury (P = .001). Receiver operating characteristic curve analysis showed that kidney oxygen saturation could predict the risk of acute kidney injury. Kidney oxygen saturation less than 65% (area under the curve-receiver operating characteristic, 0.679 ± 0.054, 95% confidence interval, 0.573-0.785, P = .002) and 20% decrease from baseline (area under the curve-receiver operating characteristic, 0.639 ± 0.059, 95% confidence interval, 0.523-0.755, P = .019) showed the better performance, respectively.ConclusionsPostoperative kidney oxygen saturation is related to the development of cardiac surgery–associated acute kidney injury. Continuous kidney saturation monitoring might be a promising, noninvasive tool for predicting acute kidney injury during the postoperative period for adult patients after cardiac surgery.     

Prediction of postoperative delirium after abdominal surgery in the elderly

Purpose  Indications for the surgical treatment of elderly patients have been increasing. Postoperative central nervous system dysfunction, including delirium, is one of the most common complications in elderly surgical patients. The relationship between patient factors, including cerebral oxygen saturation, and the incidence of postoperative delirium was evaluated. Methods  Twenty American Society of Anesthesiologists (ASA) physical status I–II patients, older than 65 years, scheduled for elective abdominal surgery were enrolled in the study. The patients’ cognitive function was assessed, using the Hasegawa dementia score (HDS) and kana-hiroi test, on the day before surgery and then again 1 week after the surgery. Regional cerebral oxygen saturation () was continuously monitored during the surgery, using near-infrared spectroscopy (INVOS 3100). General anesthesia was induced with 3 mg·kg⁻¹ thiopental and 5% sevoflurane. After tracheal intubation, the sevoflurane concentration was adjusted to maintain the bispectral index (BIS) value between 45 and 60. Postoperative delirium was diagnosed if DSM IV criteria were present and the patient scored 12 or more points on the Delirium Rating Scale. Results  After surgery, 5 (25%) patients developed delirium. The age in the delirium (+) group (76 ± 4 years) was significantly higher than that in delirium (−) group (68 ± 3 years). Preoperative and postoperative HDS did not differ between the groups. The score on the preoperative kana-hiroi-test in the delirium (+) group (16 ± 5) was significantly lower than that in the delirium (−) group (32 ± 10). There were no significant differences between preoperative and postoperative kana-hiroi test scores in either group. Baseline in the delirium (+) group (60 ± 5%) was significantly lower than that in the delirium (−) group (66 ± 7%). However, there were no significant differences between the groups in the after the start of surgery. Conclusion  Patients’ age, low preoperative kana-hiroi test score, and low preoperative were important risk factors for postoperative delirium.     

Intraoperative renal desaturation and postoperative acute kidney injury in older patients undergoing liver resection: A prospective cohort study

Study objectiveTo determine the association between intraoperative renal tissue desaturation as measured using near-infrared spectroscopy and increased likelihood of developing postoperative acute kidney injury (AKI) in older patients undergoing hepatectomy.DesignA multicenter prospective cohort study.SettingThe study was conducted at two tertiary hospitals in China from September 2020 to October 2021.Patients157 older patients (≥ 60 years) undergoing open hepatectomy surgery.Interventions and measurementsRenal tissue oxygen saturation was continuously monitored during operation using near-infrared spectroscopy. The exposure of interest was intraoperative renal desaturation, defined as at least 20% relative decline in renal tissue oxygen saturation from baseline. The primary outcome was postoperative AKI, defined using the Kidney Disease: Improving Global Outcomes criteria according to the serum creatinine criteria.Main resultsRenal desaturation occurred in 70 of 157 patients. Postoperative AKI was observed in 23% (16/70) and 8% (7/87) of patients with versus without renal desaturation. Patients with renal desaturation were at higher risk of AKI than patients without renal desaturation (adjusted odds ratio 3.41, 95% confidence interval: 1.12–10.36, p = 0.031). Predictive performance was 65.2% sensitivity and 33.6% specificity for hypotension alone, 69.6% sensitivity and 59.7% specificity for renal desaturation alone, and 95.7% sensitivity and 26.9% specificity for combined use of hypotension and renal desaturation.ConclusionsIntraoperative renal desaturation occurred in >40% in our sample of older patients undergoing liver resection and was associated with increased risk of AKI. Intraoperative near-infrared spectroscopy monitoring enhances the detection of AKI.     

A randomised controlled trial of dexmedetomidine for delirium in adults undergoing heart valve surgery

Dexmedetomidine might reduce delirium after cardiac surgery. We allocated 326 participants to an infusion of dexmedetomidine at a rate of 0.6 μg kg⁻¹ for 10 min and then at 0.4 μg.kg⁻¹.h⁻¹ until the end of surgery; 326 control participants received comparable volumes of saline. We detected delirium in 98/652 (15%) participants during the first seven postoperative days: 47/326 after dexmedetomidine vs. 51/326 after placebo, p = 0.62, adjusted relative risk (95%CI) 0.86 (0.56–1.33), p = 0.51. Postoperative renal impairment (Kidney Disease Improving Global Outcomes stages 1, 2 and 3) was detected in 46, 9 and 2 participants after dexmedetomidine and 25, 7 and 4 control participants, p = 0.040. Intra-operative dexmedetomidine infusion did not reduce the incidence of delirium after cardiac valve surgery but might impair renal function.     

Cerebral oxygen desaturation during one-lung ventilation: correlation with hemodynamic variables

Purpose

Cerebral desaturation occurs frequently in patients undergoing one-lung ventilation for thoracic surgery. The mechanism of this desaturation is unclear regarding its etiology. The objective of this study was to investigate whether or not decreases in cerebral oxygen saturation associated with one-lung ventilation were a consequence of decreased cardiac output.

Methods

A blinded observational study was conducted in 23 patients undergoing one-lung ventilation with thoracic surgery. Eighteen patients completed the study. Cerebral oxygen saturation was monitored using near-infrared spectroscopy (FORE-SIGHT^® monitor). Invasive blood pressure was monitored and hemodynamic variables were interrogated using the FloTrac^® system. Anesthesia was maintained with sevoflurane with a F _i O₂ of 1.0. Post-hoc analysis involved a comparison between baseline and integrated changes in cerebral saturation, heart rate, stroke index, cardiac index, and stroke volume variability.

Results

All patients showed cerebral desaturation from a baseline of two-lung ventilation in the lateral decubitus position following institution of one-lung ventilation. The cardiac index was stable at these times, but with one-lung ventilation, the heart rate decreased and the stroke index increased to maintain a stable product. The integral of heart rate × time was inversely correlated with the integral of cerebral desaturation × time (linear regression analysis; P = 0.02; (df) = 16)).

Conclusions

Cerebral oxygen desaturation was universal during one-lung ventilation in this study. There was no correlation between cerebral desaturation and cardiac output or other hemodynamic variables.     

Postoperative delirium: An independent risk factor for poorer quality of life with long-term cognitive and functional decline after cardiac surgery

Study objectiveTo evaluate the influence of delirium on the functional and cognitive capacity of patients included in the DELIPRECAS study, as well as on their quality of life, in the 3–4 years after cardiac surgery.DesignProspective observational study.SettingAssessment of cognitive and functional status from hospital discharge to the present, 3 years after cardiac surgery.Patients313 patients undergoing cardiac surgery consecutively, aged 18 years or over.MeasurementsThe primary outcome measure was the cognitive and functional status of the patients 3 years after cardiac surgery, evaluated by telephone interview, and the possible influence on them of delirium diagnosed by the Confusion Assessment Method in Intensive Care Units (CAM-ICU) during their stay in the intensive care unit after cardiac surgery.Main resultsPostoperative delirium acts as an independent risk factor for the long-term development of memory problems (OR 6.11, 95% CI 2.54 to 14.68, p < 0.001), concentration (OR 11.20, 95% CI 3.58 to 35.09, p > 0.001), confusion/disorientation (OR 10.93, 95% CI 3.61 to 33.12, p > 0.001), sleep problems (OR 5.21, 95% CI 2 0.29 to 11.84, p < 0.001), nightmares (OR 8.99, 95% CI 1.98 to 40.90, p = 0.004), emotional problems (OR 4.30, 95% CI 1.87 to 9.91, p = 0.001) and poorer mobility after hospital discharge (OR 2.436, 95% CI 1.06 to 5.61, p = 0.037). The number of hospital readmissions was also significantly higher in those patients who developed delirium after cardiac surgery (27% vs 13.8%, p = 0.022).ConclusionPostoperative delirium is a risk factor for decreased quality of life in patients 3 years after heart surgery, being associated with greater cognitive and functional deterioration, as well as greater risk of hospital readmission. Therefore, emphasis should be placed on both prevention and early recognition and treatment of delirium to improve long-term outcomes for patients after cardiac surgery.     

Monitoring cerebral oxygen saturation in elderly patients undergoing general abdominal surgery: a prospective cohort study

BACKGROUND AND OBJECTIVES: The aim of this prospective, observational study was to evaluate changes in regional cerebral oxygen saturation (rSO2) and incidence of intraoperative cerebral desaturation in a cohort of elderly patients undergoing major abdominal surgery. METHODS: rSO2 was continuously monitored on the left and right sides of the forehead in 60 patients older than 65 yr (35 males and 25 females; ASA II-III; age: 72 +/- 5 yr; without pre-existing cerebral pathology, and baseline Mini Mental State Examination (MMSE) score >23) undergoing sevoflurane anaesthesia for major abdominal, non-vascular surgery >2 h. RESULTS: Baseline rSO2 was 63 +/- 8%; cerebral desaturation (rSO2 decrease <75% of baseline or <80% in case of baseline rSO2 <50%) occurred in 16 patients (26%). The MMSE decreased from 28 +/- 1 before surgery to 27 +/- 2 on 7th postoperative day (P = 0.05). A decline in cognitive function (decrease in MMSE score > or = 2 points one week after surgery as compared to baseline value) was observed in six patients without intraoperative cerebral desaturation (13.6%) and six patients who had intraoperative cerebral desaturation (40%) (P = 0.057) (odds ratio: 4.22; CI95%: 1.1-16). Median (range) hospital stay was 14 (5-41) days in patients with an area under the curve of rSO2 <50% (AUCrSO2<50%) >10 min%, and 10 (4-30) days in those with an AUCrSO2<50% <10 min% (P = 0.0005). CONCLUSIONS: In a population of healthy elderly patients, undergoing non-vascular abdominal surgery cerebral desaturation can occur in up to one in every four patients, and the occurrence of cerebral desaturation is associated with a higher incidence of early postoperative cognitive decline and longer hospital stay.     

Effects of high positive end‐expiratory pressure on haemodynamics and cerebral oxygenation during pneumoperitoneum in the Trendelenburg position

We investigated the effects of 10 cmH₂O positive end‐expiratory pressure on cerebral haemodynamics and cerebral oxygenation in patients undergoing laparoscopic lower abdominal surgery in the 30° Trendelenburg position during desflurane anaesthesia. Twenty‐six patients were enrolled in this study. After anaesthesia induction, pneumoperitoneum was applied in Trendelenburg position. Twenty minutes later, positive end‐expiratory pressure was applied. There was no change in regional cerebral oxygen saturation (p = 0.376). Cerebral perfusion pressure decreased significantly over time (p < 0.001) and positive end‐expiratory pressure caused a further decrease in cerebral perfusion pressure (p = 0.036). The application of 10 cmH₂O positive end‐expiratory pressure during pneumoperitoneum in the Trendelenburg position preserved regional cerebral oxygen saturation, but cerebral perfusion pressure decreased significantly due to its secondary haemodynamic effects.     

Association between perioperative hypotension and postoperative delirium and atrial fibrillation after cardiac surgery: A post-hoc analysis of the DECADE trial

Study objectiveTo test the hypotheses that in adults having cardiac surgery with cardio-pulmonary bypass, perioperative hypotension increases the risk of delirium and atrial fibrillation during the initial five postoperative days.DesignSub-analysis of the DECADE multi-center randomized trial.SettingPatients who had cardiac surgery with cardiopulmonary bypass at the Cleveland Clinic.InterventionsIn the underlying trial, patients were randomly assigned 1:1 to dexmedetomidine or normal saline placebo.MeasurementsIntraoperative mean arterial pressures were recorded at 1-min intervals from arterial catheters or at 1–5-min intervals oscillometrically. Postoperative blood pressures were recorded every half-hour or more often. The co-primary outcomes were atrial fibrillation and delirium occurring between intensive care unit admission and the earlier of postoperative day 5 or hospital discharge. Delirium was assessed twice daily during the initial 5 postoperative days while patients remained hospitalized with the Confusion Assessment Method for the intensive care unit. Assessments were made by trained research fellows who were blinded to the dexmedetomidine administration.Main resultsThere was no significant association between intraoperative hypotension and delirium, with an adjusted odds ratio of 0.94 (95% CI: 0.81, 1.09; P = 0.419) for a doubling in AUC of mean arterial pressure (MAP) <60 mmHg. An increase in intraoperative AUC of MAP <60 mmHg was not significantly associated with the odds of atrial fibrillation (adjusted odds ratio = 0.99; 95% CI: 0.87, 1.11; P = 0.819). Postoperative MAP <70 mmHg per hour 1.14 (97.5% CI: 1.04,1.26; P = 0.002) and MAP <80 mmHg per hour 1.05 (97.5%: 1.01, 1.10; P = 0.010) were significantly associated with atrial fibrillation.ConclusionsIn patients having cardiac surgery with cardio-pulmonary bypass, neither intraoperative nor postoperative hypotension were associated with delirium. Postoperative hypotension was associated with atrial fibrillation, although intraoperative hypotension was not.     

Effects of remote ischemic preconditioning on regional cerebral oxygen saturation in patients in the beach chair position during shoulder surgery: A double-blind randomized controlled trial

Study objectiveThe beach chair position for shoulder surgery induces cerebral hypoperfusion. We evaluated the effects of remote ischemic preconditioning (RIPC) prior to surgery to ameliorate cerebral desaturation in a double-blind randomized fashion.DesignBlinded, prospective, randomized study.SettingOperating room & postoperative recovery room, tertiary university hospital.PatientsSeventy patients scheduled for shoulder surgery were recruited. After excluding 7 patients according to the exclusion criteria, 63 patients were randomized into two groups (control and RIPC).InterventionsRemote ischemic preconditioning was applied by briefly inflating a tourniquet on the thigh three times just after inducing anesthesia in the RIPC group.MeasurementsThe changes in regional cerebral oxygen saturation, hemodynamic values, laboratory values, and serum levels of cytokines including interleukin (IL)-1β, IL-6, IL-10 and transforming growth factor-β were measured.Main resultsThe remote ischemic preconditioning group had higher regional cerebral oxygen saturation just after establishment of the beach chair position (P = 0.002) and lower cerebral desaturation (P = 0.007) during operation than the control group. Hemodynamic and laboratory values did not differ between the groups. There were no significant intergroup differences in cytokine levels.ConclusionRemote ischemic preconditioning before surgery ameliorates cerebral desaturation in patients in the beach chair position during shoulder surgery.Trial Registry Number: KCT0001384 (http://cris.nih.go.kr)     

心肺转流心脏手术术后谵妄的预防

术后谵妄是手术后常见的神经系统并发症,表现为急性发作的注意力不集中、思维混乱和意识水平的改变等。心肺转流心脏手术患者的术后谵妄发生率明显高于其他类型手术,严重影响患者术后恢复和生存质量。尽管不能完全避免术后谵妄的发生,但有效的预防措施可以明显降低心肺转流心脏手术患者术后谵妄的发生率。本文章回顾近年来国内外术后谵妄的相关研究,简要总结术后谵妄的发生机制,以时间轴为导向,分别以术前、术中、术后三个时段展开,从药物和非药物两方面对心肺转流心脏手术术后谵妄的预防策略进行综述,为临床上更好地预防术后谵妄的发生提供参考。     

Cerebral oxygen desaturation is associated with early postoperative neuropsychological dysfunction in patients undergoing cardiac surgery

OBJECTIVE: To evaluate the relationship between cerebral oxygen saturation and neuropsychological dysfunction after cardiac surgery. DESIGN: Prospective and observational study. SETTING: Operating room and cardiac floor of a university hospital. PARTICIPANTS: One hundred one patients undergoing elective cardiac surgery with cardiopulmonary bypass INTERVENTION: Bilateral noninvasive cerebral oxygen saturations were monitored over the forehead. The anesthetic and surgical techniques were performed as usual, and no interventions were attempted based on the monitor. Neuropsychological outcome was assessed by the Mini-Mental State Examination (MMSE) and the antisaccadic eye movement test (ASEM). MEASUREMENTS AND MAIN RESULTS: Preoperative baseline values of cerebral oxygen saturation (rSO(2)) were 58.6% +/- 10.2%. Patients with the nadir rSO(2) <35% had significantly higher incidences of postoperative ASEM and MMSE impairments than those with rSO(2) always above 35% (44% and 33% v 12% and 9%, respectively). Patients with areas of rSO(2) <40% for more than 10 minutes . % presented with a significantly higher incidence of postoperative ASEM and MMSE impairments than those with areas of rSO(2) <40% for less than 10 minutes . % (42% and 32% v 13% and 10%, respectively). Patients with postoperative ASEM or MMSE impairment had significantly lower nadir rSO(2) and significantly larger areas of rSO(2) <40%, <45%, and <50% than those with normal postoperative neuropsychological outcome. However, multivariate logistic regression analysis showed that areas of rSO(2) <40% were the only predictor for both postoperative ASEM and MMSE impairments. CONCLUSIONS: Intraoperative cerebral oxygen desaturation is associated with early postoperative neuropsychological dysfunction in patients undergoing cardiac surgery with cardiopulmonary bypass. However, it remains to be determined whether interventions to maintain adequate cerebral oxygenation may improve neuropsychological outcome.     

创伤性休克病人术后谵妄的临床相关因素分析

目的:探讨创伤性休克病人术后谵妄的临床相关影响因素。方法 :选择急诊手术的创伤性休克病人50例,男31例,女19例,年龄19～68岁。术前、术后12 h及术后第1、2、3天随访病人,用意识模糊谵妄评定法进行谵妄评估。记录病人血乳酸、血糖、颈内静脉血氧饱和度、血肌酐、血尿素氮和血半胱氨酸蛋白酶抑制剂C浓度值,检测术中失血量及术后谵妄的发生情况,建立数据库。根据是否发生谵妄分为谵妄组和对照组。结果:发生术后谵妄23例,发生率为46%。多因素logistic逐步回归分析发现病人年龄大、高乳酸血症、高血糖、颈内静脉血氧饱和度降低、急性肾功能损伤及术中失血量大均是谵妄的危险因素(P<0.05)。结论:年龄大、高乳酸血症、高血糖、颈内静脉血氧饱和度降低、急性肾功能损伤及术中大量失血为创伤性休克病人术后谵妄的危险因素。     

The influence of orthopedic surgery on the incidence of post-operative delirium in geriatric patients: results of a prospective observational study

BackgroundPostoperative delirium (PD) is a major concern in geriatric patients undergoing orthopedic surgery. This prospective observational study aims to examine the incidence of PD, to identify intervention-specific risk factors and to investigate the influence of orthopedic surgery on delirium.MethodsFrom 2019 to 2020, 132 patients ≥70 years of age with endoprosthetic (Group E) or spinal surgery (Group S) were included. Upon admission, the ISAR score, the Nursing Delirium Screening Scale, potential risk factors, the ASA score, duration of surgery, type of anesthesia, blood loss, and hemoglobin drop were recorded. For risk factor analysis patients were grouped into Group D (delirium) and Group ND (no delirium). Primary endpoint was the occurrence of PD.ResultsOf 132 patients, 50 were included in Group E and 82 in Group S. Mean age and ISAR score were not significantly different between groups. Delirium rate in Group E and S was 12% vs. 18% (p = 0.3). Differences could be observed between Group D and ND in duration of surgery (173 min vs. 112 min, p = 0.02), postoperative hemoglobin drop (3.2 g/dl vs. 2.3 g/dl; p = 0.026), history of PD (23% vs. 11%, p = 0.039) and use of isoflurane (6 vs. 2). Type of surgery was not an independent risk factor (p = 0.26).ConclusionSpecific type of orthopedic surgery is not an independent risk factor for PD. Prevention of PD should focus on duration of surgery and blood loss, particularly in patients with a history of PD. A possible delirogenic potential of isoflurane should be further studied.     

Patient-Controlled Analgesia After Cardiac Surgery With Median Sternotomy: No Advantages of Hydromorphone When Compared to Morphine

ObjectivesTo compare the efficacy, safety, and side effects of hydromorphone and morphine administered as patient-controlled analgesia (PCA) for postoperative pain therapy after cardiac surgery with median sternotomy.DesignA retrospective analysis of data from 2 prospective, single-blinded, randomized trials.SettingA single-center intensive care unit at a university hospital.ParticipantsForty-one adult patients undergoing cardiac surgery with median sternotomy.InterventionsPostoperative pain therapy at the intensive care unit was performed by PCA with intravenously administered bolus doses of 0.2 mg of hydromorphone (n = 21) or 2 mg of morphine (n = 20).Measurements and Main ResultsPain at rest and under deep inspiration regularly was assessed using the 11-point numerical rating scale (NRS). Blood pressure, heart rate, cardiac output, oxygen saturation, and respiratory rate were monitored, and adverse events were registered. The median (range) NRS rating at rest was 1.5 (0-5) after hydromorphone and 0.5 (0-5) after morphine, respectively (p = 0.41). The median NRS rating under deep inspiration was 3 (0-6) after hydromorphone and 4 (0-7) after morphine, respectively (p = 0.074). The dose ratio of morphine to hydromorphone during PCA was 5.7 (95% confidence interval: 2.9-7.6). Hemodynamics and respiration were stable and did not differ significantly. Postoperative nausea and vomiting were the most frequent adverse events, which were observed in 29% of the patients after hydromorphone and in 35% after morphine, respectively (p = 0.74).ConclusionsThere were no significant differences in analgesic efficacy and safety between hydromorphone and morphine when used for postoperative pain therapy with PCA after cardiac surgery with median sternotomy.