Acta Anaesthesiologica Scandinavica最新文献

Background: Inadequate pain relief with moderate to severe pain remains a challenge after cesarean section and may significantly impair postoperative recovery. However, detailed assessment on the timing of severe pain, opioid consumption, influence on activities such as mobilization, breastfeeding, and caring for the infant are difficult to conduct, especially after discharge. Short message services (SMS)-based questionnaires may offer a low-cost way of providing such data but with the risk of insufficient response rates. We assessed the feasibility of collecting detailed, prospective data on postoperative pain and recovery during the initial hours and days following cesarean section using SMS-based questionnaires.

Methods: Prospective Danish single-center cohort study involving elective cesarean sections under spinal anesthesia with fentanyl and bupivacaine. The postoperative pain regimen consisted of paracetamol, NSAID and oral morphine by request. Patients received an SMS-based questionnaire at 6, 12, 18, 24, and 48 h postoperatively, as well as on days 7 and 30.

Primary outcome: Response rate and time from receiving the SMS to completion of the questionnaires.

Secondary outcomes: Opioid consumption and Patient Reported Outcomes Measures on pain and recovery.

Results: From December 2022 to June 2023; 100 patients were included. The response rate was 78% at 6 h postoperatively, decreasing to 63% at 24 h. The median response time from receiving to answering the SMS-based questionnaire at 6 h after cesarean section was 23 min (IQR 2-72), decreasing to 20 min (IQR 2-78) after 24 h. Severe pain, corresponding to a Numeric Rating Scale (NRS) score >6, was reported by 57% (95% CI 65-84) at 6 h, decreasing to 28% (95% CI 34-58) at 24 h. Median opioid consumption within the first 24 h was 30 mg (IQR 20-50).

Conclusion: SMS-based questionnaires on Patient Reported Outcome Measures are a feasible and cost-effective way of prospectively collecting frequent data with acceptable response rates, even shortly after cesarean section. Secondarily 66% of patients reported severe pain during the first 24 h following cesarean section, with the highest pain scores within the initial 12 h. Future studies should focus on optimizing pain-management within this timeframe.

Background: Despite advancements in surgical and anesthesia techniques, acute and persistent postoperative pain are still a common challenge. Postoperative pain has direct effects on individual patient care and outcome, as well as putting strain on limited health care resources. Several prediction methods for postoperative pain have been described. One such method is the assessment of pain during peripheral venous cannulation (VCP). It is not known if different approaches to anesthesia and analgesia, depending on the evaluation of risk for postoperative pain, can improve outcome. The aim of this study is to evaluate if individualized anesthesia and analgesia can affect postoperative pain and recovery after surgery, in patients stratified by VCP.

Methods: Adult patients scheduled for laparoscopic surgery undergo pain-sensitivity stratification using VCP on the day of surgery. Patients scoring VCP ≥2.0 on the visual analogue scale (pain-sensitive) are randomized to multimodal anaesthesia and analgesia with opioids or standard of care. Patients scoring VCP ≤1.9 (pain-tolerant) are randomized to opioid-free anaesthesia or standard of care. The primary outcome is acute postoperative pain measured with numeric rating scale in the postoperative care unit. Secondary outcomes include analysis of pain after 24 h, persistent postoperative pain and quality of recovery.

Discussion: Individualized perioperative pain management has the potential to improve patient care. This study will examine the impact of different anesthesia and analgesia regimes, in patients with differing pain sensitivity, on postoperative pain.

Trial registration: Prospectively posted at ClinicalTrials.gov, identifier NCT04751812.

Background: In settings where general anaesthesia is unnecessary, effective sedation, analgesia and local anaesthesia are crucial for optimal outcomes. Traditionally, sedation have been managed and controlled by healthcare professionals, but advancements in pharmacology and technology have renewed the way we are able to sedate. Patient-controlled sedation (PCS) offers a promising approach, allowing patients to adjust their sedation levels during procedures. This shift aims to enhance sedation quality, improve patient satisfaction and involvement and expedite discharge.

Methods: The search strategy will be crafted in partnership with the Librarian well-versed in scoping reviews. 'Patient controlled sedation' is a wide search. The search will include databases, as MEDLINE/PubMed, EMBASE, Cochrane Central Register of Controlled Trials, CINAHL and Google Scholar. All literature findings will be entered into a web-based screening and data extraction tool. Two independent reviewers will assess the eligibility and inclusion of all studies. The variables to be extracted will encompass trial characteristics, participant characteristics, assessment of PCS, identified risk factors for PCS, and the evaluation of patient satisfaction as assessed in the included studies.

Results: Following PRISMA-P and PRISMA-ScR guidelines, this scoping review includes studies of any design. Data synthesis involves descriptive statistics and narrative presentations to explore the relationship between results and objectives. The outcome will be which procedures/surgeries PCS is used for and which patients are eligible for PCS. Additionally, aspects such as patient and operator satisfaction, economical pros and cons adverse effects will be considered.

Conclusion: The scoping review will aim to give a better understanding of in which settings PCS is used. This scoping review provides a comprehensive understanding of PCS and identifies gaps in the literature to shape future research, so we can ensure the best possible sedation for patients in the future.

Background: Prone position ventilation (PPV) is recommended for patients with COVID-19 induced severe Adult Respiratory Distress Syndrome (ARDS) and is used for patients supported with V-V ECMO as well. The purpose of this study was to describe the use of PPV in these patients focusing on physiological effects with the hypothesis that PPV could reduce oxygen need and improve dynamic compliance.

Methods: This study was a nationwide retrospective analysis of all COVID-19 patients in Denmark from March 2020 - December 2021 with severe ARDS and need of V-V ECMO support. Data on the number of patients treated with PPV, number of PPV sessions, timing, the time spent in prone position, pulmonary physiological response types with analysis of variables affecting the response are reported.

Results: Out of 68 patients 44 were treated with 220 PPV sessions and a positive clinical response was observed in 80% of patients but only in 45% of sessions. On a single session level, increased compliance was observed in 38% and increased oxygenation in only 15% of 220 sessions, with within-patient heterogeneity. Higher dynamic compliance at the beginning of a PPV session was associated with a lower delta change in dynamic compliance during PPV. The response to a PPV session could not be predicted by the response in the prior session. Dynamic compliance did not change during the ECMO course.

Conclusion: Eighty percent of patients responded positively during a PPV session, but this was not associated with overall pulmonary improvement. On a single patient level, responses were heterogenous and only 45% of sessions resulted in clinical improvement. Response in dynamic compliance was associated with starting values of compliance.

Background: Cocaine may be applied to decongest the nasal mucosa before nasotracheal intubation, but patients risk a criminal offence if cocaine is detected when patients drive a car shortly after surgery. We aimed to evaluate whether benzoylecgonine levels in saliva exceeded the cut-off point 24 h after administration in patients undergoing nasotracheal intubation and whether cocaine would be detectable above the Danish legal fixed limit in blood samples 1 and 24 h after surgery.

Methods: We conducted a prospective study following approval from the local research ethics committee and the national medicine agency. Written informed consent was obtained from all patients. We included patients scheduled for surgery under general anaesthesia with nasotracheal intubation. They received 80 mg cocaine as a nasal spray 5 min before induction and nasotracheal intubation. The primary outcome was a dichotomous assessment of benzoylecgonine levels in saliva samples measured 24 h after administration of nasal cocaine with a cut-off limit of 200 ng/mL. Secondary outcomes were dichotomous assessments of cocaine in whole blood samples measured 1 and 24 h after administration of nasal cocaine with a cut-off limit of 0.01 mg/kg.

Results: Overall, 70 patients had valid saliva samples and 75 had valid blood samples 24 h after cocaine administration. Benzoylecgonine in saliva was traceable above the cut-off in 9/70 patients (13%; CI_95%: 6% to 23%), and cocaine in blood was detected above the cut-off in 2/75 patients (3%; CI_95%: 0.3% to 9%).

Conclusion: We found benzoylecgonine traceable in saliva in 13% of patients and cocaine traceable in blood in 3% of patients 24 h after administration of 80 mg nasal cocaine. Patients should be informed when receiving cocaine and advised not to drive for at least 24 h.

Background: Nasotracheal intubation is associated with a risk of epistaxis. Several drugs, including cocaine and xylometazoline may be used as decongestants prior to nasotracheal intubation to prevent this. We hypothesized that xylometazoline would prevent epistaxis more effectively than cocaine, demonstrated by a lower proportion of patients with bleeding after nasotracheal intubation.

Methods: We conducted a single-center, outcome assessor and analyst-blinded, clinical randomized controlled trial following approval from the local research ethics committee and the national medicine agency. Written informed consent was obtained from all patients. Patients scheduled for surgery under general anesthesia with nasotracheal intubation were randomized to receive either 2 mL 4% cocaine or 2 mL 0.05% xylometazoline prior to nasotracheal intubation. Immediately following intubation, epistaxis was evaluated by the blinded intubating anesthetist on a four-point scale. We measured heart rate and blood pressure the first 5 min after drug administration. Adverse events were followed up after 24 h.

Results: A total of 53 patients received cocaine and 49 patients received xylometazoline. Bleeding occurred in 32 patients receiving cocaine (60.4%) and in 34 patients receiving xylometazoline (69.4%) (p = .41, Fisher's exact test) with a difference of 9.0% (95% CI: -9.4% to 27%). There was no statistically significant difference between groups regarding the heart rate or blood pressure. No adverse cardiac events were recorded in either group.

Conclusion: We found no statistically significant difference between cocaine and xylometazoline in preventing epistaxis after nasotracheal intubation, and the choice of vasoconstrictor should be based on other considerations, such as pricing, availability and medicolegal issues.

Background: Access to the neuraxial space, including lumbar punctures and neuraxial anaesthesia, is an everyday procedure in clinical practice. Traditionally these procedures rely on manual palpation technique, but ultrasound is a useful tool when patients prove challenging. Presently, there is a lack of evidence-based guidelines for technical skills acquisition, both with and without ultrasound, and likewise, competency assessment approaches vary globally. Accordingly, we aim to assess the current evidence regarding learning and assessment in neuraxial access $\pm$ ultrasound, for future educational recommendations.

Methods: This scoping review will be conducted in accordance with the Preferred Reporting Items for Systematic and Meta-Analysis (PRISMA) statement, together with the PRISMA Extension for Scoping Reviews. A systematic search strategy will be based on a PICO approach, focusing on physicians, medical students, or nurses being exposed to education, training, or assessment in procedural neuraxial access $\pm$ ultrasound. No comparators are obligated, but outcomes should be assessable using the Kirkpatrick four levels of training evaluation. The search will be performed in Cochrane Library, Embase, Medline, Scopus, PubMed, and CINAHL. Independently, two authors will screen the studies and conflicts will be resolved by a third author. Relevant predefined data will be extracted and analysed using a descriptive approach. The quality of the studies will be assessed using the Medical Education Research Study Quality Instrument.

Discussion: This scoping review will contribute by presenting gathered evidence of an overview of the different approaches to achieving education and training of technical skills in neuraxial access, and how skills are tested, which could guide research and future recommendations for skills development and assessment.

Background: The use of intranasal dexmedetomidine is hampered by a limited understanding of its absorption pharmacokinetics.

Methods: We examined the pharmacokinetics and feasibility of intranasal dexmedetomidine administered in the supine position to adult patients undergoing general anaesthesia. Twenty-eight patients between 35 and 80 years of age, ASA 1-3 and weight between 50 and 100 kg, who underwent elective unilateral total hip or knee arthroplasty under general anaesthesia were recruited. All patients received 100 μg of intranasal dexmedetomidine after anaesthesia induction. Six venous blood samples (at 0, 5, 15, 45, 60, 240 min timepoints from dexmedetomidine administration) were collected from each patient and dexmedetomidine plasma concentrations were measured. Concentration-time profiles after nasal administration were pooled with earlier data from a population analysis of intravenous dexmedetomidine (n = 202) in order to estimate absorption parameters using nonlinear mixed effects. Peak concentration (C_MAX) and time (T_MAX) were estimated using simulation (n = 1000) with parameter estimates and their associated variability.

Results: There were 28 adult patients with a mean (SD) age of 66 (8) years and weight of 83 (10) kg. The mean weight-adjusted dose of dexmedetomidine was 1.22 (0.15) μg kg^-1. C_MAX 0.273 μg L^-1 was achieved at 98 min after intranasal administration (T_MAX). The relative bioavailability of dexmedetomidine was 80% (95% CI 75-91%). The absorption half-time (T_ABS = 120 min; 95% CI 90-147 min) was slower than that in previous pharmacokinetic studies on adult patients. Perioperative haemodynamics of all patients remained stable.

Conclusions: Administration of intranasal dexmedetomidine in the supine position during general anaesthesia is feasible with good bioavailability. This administration method has slower absorption when compared to awake patients in upright position, with consequent concentrations attained after T_MAX for several hours.