Anesthetic Dose Research Articles

FEATURES OF ANESTHESIA IN PATIENTS WITH SPECIAL NEEDS. PART 2

Cannabis potentially interacts with drugs commonly used for anesthesia, which can be life-threatening. Dysfunctions of various organs and systems in cannabis users classify them as patients at increased perioperative risk. When planning anesthesia, acute cannabis intoxication and chronic use should be considered, as patients with acute intoxication may require lower doses of anesthetics (but emergence from anesthesia will be significantly prolonged compared to nonintoxicated states). Chronic exposure to cannabinoids outside of acute intoxication leads to downregulation of receptors, which may result in increased anesthesia tolerance when patients abstain from cannabis before anesthesia. Regional anesthesia methods are preferred in cannabis-dependent individuals. Tolerance to propofol is increased in cannabis users. Acute cannabis intoxication mostly causes additive effects with general anesthesia drugs. Chronic cannabis use mostly results in cross-tolerance to general anesthesia drugs. Anesthesiologists, surgeons, and intensive care physicians should understand the impact of cannabis on the action of general anesthesia drugs to implement safe perioperative management.

Epidural Anesthesia Management for Unilateral Salpingo-Oophorectomy in Patients with Ovarian Mass : A Case Report

with sedation and mainly used in elderly patients or those with medical problems, including those who had ovarian mass. Epidural administration of amide local anesthetics in combination with opioids is widely used for pain relief because of the dose minimizing and side effects reducing benefits. Case: Patient was diagnosed with ovarian mass. The patient also had pleural effusion, ascites, and hypoalbuminemia. Epidural anesthesia used in this patient as a resource for perioperative and postoperative pain management. Discussion: Patient underwent unilateral salpingo-oophorectomy for her ovarian mass. Anesthetic doses were given carefully due to patient conditions with pleural effusion and ascites. Opioid and Neuromuscular Blocking Agents (NMBAs) effects were absolutely decreased due to hypoalbuminemia, but were overcome with Naloxone and Sugammadex. Epidural anesthesia used to stabilize the drugs and pain management for this patient. Conclusion: Epidural anesthesia is an excellent choice for unilateral salpingo-oophorectomy in patients with ovarian mass. It has been proven to provide excellent pain control after major surgeries and may be associated with a lower incidence of postoperative complications.

Analysis of the Effects of Epidural Anesthesia on the Nociception Level Index (NOL®) during Abdominal Surgery.

Background: The NOL® system (PMD-200™ Nociception Level Monitor; Medasense Ltd., Ramat Gan, Israel) is used for the real-time detection of physiological nociception in anesthetized patients by assessing the parameters indicative of sympathetic activity, such as photoplethysmography, skin conductance, peripheral temperature, and accelerometry, which are quantified into the NOL®-Index. This index is more sensitive than traditional clinical parameters in estimating pain and stress responses. While its effectiveness in general anesthesia is well documented, its efficacy in epidural anesthesia needs further investigation. Methods: This retrospective study analyzed NOL®-Index dynamics compared to conventional parameters after epidural administration of bupivacaine. Following ethics committee approval, 119 NOL® measurements were retrospectively analyzed after thoracic epidural catheter administration in 40 patients undergoing abdominal and urological surgery. The NOL-Index® was assessed at 0, 1, 3, and 5 min post application and compared to heart rate, blood pressure, and bispectral index dynamics. Results: This study showed a significant decrease in the NOL®-Index post-local-anesthetic administration with better sensitivity than classical clinical parameters (0 min = 38 ± 11; 1 min = 22 ± 13*; 3 min = 17 ± 11*; 5 min = 12 ± 10*). Higher doses of local anesthetics led to a significant, dose-dependent decrease in NOL®-Index (low dose, 5 min = 15 ± 10*; high dose, 5 min = 8 ± 8*). Conclusions: This study is the first to demonstrate the effectiveness of the NOL®-Index in measuring nociceptive effects following epidural administration, highlighting its potential superiority over conventional parameters and its sensitivity to dose variations.

Evaluation of the Predictive Character of the Expiratory Inferior Vena Cava/Abdominal Aorta (eIVC/Ao) Index for Minimum Blood Pressure Following Spinal Anesthesia With 0.5% Hyperbaric Bupivacaine.

Spinal anesthesia has many side effects, one of them being a drop in blood pressure (BP). Identifying predictive factors for this drop is a clear matter of concern. In this regard, the expiratory inferior vena cava/abdominal aorta (eIVC/Ao) index has already been spotted as such for doses of 0.5% hyperbaric bupivacaine greater than 12mg. Departing from the demonstrated correlation between this index and hypotension post-spinal anesthesia, our study aimed to (1) evaluate whether an eIVC/Ao index greater than 0.7, thus defining non-hypovolemic patients, can also predict minimal BP for doses inferior to 12mgand (2) identify other predictive factors for minimal BP post-spinal anesthesia. Lastly, we verified whether preoperative fasting induces hypovolemia. This single-center prospective observational pilot study included 20 patients. The baseline measurements of BP, eIVC/Ao index, and fasting time were recorded at time T0'. Then spinal anesthesia was administered with 0.5% hyperbaric bupivacaine in doses inferior to 12 mg. The patients' systolic blood pressure (SBP), diastolic blood pressure (DBP), mean arterial pressure (MAP), and metameric levels were each recorded at times T5', T10', T15', and T20'. The results indicated that baseline DBP was predictive of low DBP and minimum MAP, which reflect myocardial perfusion and systemic pressures, respectively. Therefore, it should trigger prophylaxis (spinal-lateralized, continuous, or lower dose) in patients with a low DBP baseline. Additionally, baseline SBP was predictive of minimumSBP, an independent risk factor for post-anesthetic hypotension if its baseline is lessthan 120 mmHg. Although female gender was linked to minimum SBP, other confounding factors (size, dose administered, and type of surgery related to gender) must also be considered. Moreover, a correlation was established between height and MAP in parturients. Hypotension was not recorded at local anesthetic (LA) doses between 8 and 12 mg and the doses administered were sufficient to achieve the metameric levels required for surgery (ether tests). Since 8 mg of 0.5% hyperbaric bupivacaine achieved the same level as 12 mg, lower doses of LA might prevent a significant drop in BP and its deleterious effects. Therefore, in the current cohort, the eIVC/Ao index was not predictive of minimum BP during spinal anesthesia with doses less than 12 mg of 0.5% hyperbaric bupivacaine. However, predictive factors for minimum BP included gender and baseline SBP (for minimum SBP), height and baseline DBP (for minimum MAP), and baseline DBP (for minimum DBP). Lastly, preoperative fasting did not cause hypovolemia.

Venous sinus stenting under conscious sedation

BackgroundVenous sinus stenting (VSS) is an increasingly performed procedure for the treatment of idiopathic intracranial hypertension (IIH) refractory to medical treatment. VSS is typically performed under general anesthesia.ObjectiveTo present our...

A comparative study of levobupivacaine 0.25% with dexmedetomidine and dexamethasone as adjuvant in caudal block for pediatric patients undergoing infraumbilical surgeries

Background: The caudal epidural block is one of the most commonly used regional techniques for post-operative pain management in pediatric age group patients undergoing infraumbilical surgeries. Adjuvants use increase the duration of analgesia and decrease local anesthetic dose requirement, thereby decreasing the risk of toxicity. Aims and Objectives: The aim of the present study was to compare the prolongation of the duration of analgesia, hemodynamic parameters, and side effects if any, provided by the addition of dexmedetomidine (DEX) or dexamethasone as an adjuvant to levobupivacaine in the caudal block. Materials and Methods: A total of 60 patients with the American Society of Anesthesiologists grade I/II scheduled for elective infraumbilical surgeries were randomly allocated into two groups of 30 each. Group 1 received levobupivacaine 0.25% 1 mL/kg+DEX 1 mcg/kg and Group 2 received levobupivacaine 0.25% 1 mL/kg+dexamethasone 0.1 mg/kg for caudal block. The duration of analgesia, hemodynamic parameters, and adverse events during the post-operative period were noted. Results: There was no statistically significant difference in hemodynamic parameters between Group 1 and Group 2. Post-operative face, leg, activity, cry, consolability, (FLACC) pain scores were significantly lower in Group 1 when compared with Group 2. The mean duration of analgesia was prolonged in Group 1 at 824.23±53.53 min than in Group 2 with a mean duration of analgesia 480.50±31.66 min which was statistically significant (P<0.005). Adverse events were comparable between the two groups and were statistically not significant (P>0.05). Conclusion: The addition of DEX to levobupivacaine in caudal block significantly prolongs the duration of analgesia in post-operative period in comparison to the addition of dexamethasone with levobupivacaine. It also provides more hemodynamic stability during the intraoperative and post-operative period, lower FLACC pain scores, and is associated with minimal side effects.

Not just tachycardia: A pilot study examining wound‑healing complications associated with the dose and volume of lignocaine in skin cancer excisions.

General practitioners excise many suspected skin cancers using local anaesthetics such as lignocaine, but the relationships between the dose and volume of the local anaesthetic and wound complications are unclear. This pilot study considers an association between the dose and volume and complications. An audit was conducted of patient records from two timeperiods: one before and one after an education intervention. Data extracted included lignocaine (volume and dose), wound complications (dehiscence and infection) and the demographics of patients and clinicians. Both the dose and volume of lignocaine administered were significantly associated with complication rates (P=0.0084 and P=0.0209, respectively). In the post-intervention period, clinician behaviour changed, witha reduction in the volume and dose of lignocaine administered (P<0.001 and P<0.001, respectively) withoutepisodes of inadequate analgesia. This pilot study reported a relationship between lidocainedose and volume and rates of complications. Shortcomings of this study limit attribution of findings toclinical practice. However, the results justify further rigorous research.

Comparative analysis of the consistency of anesthesia depth between anesthesia index and Narcotrend index in monitoring pediatric tonsillectomy/adenoidectomy surgery

Objective: To analyze the consistency of the anesthesia index (AI) and Narcotrend index (NI) in monitoring the depth of anesthesia in pediatric tonsil/adenoidectomy. Methods: A total of 129 children who underwent elective tonsil/adenoidectomy at Xijing Hospital Affiliated to Air Force Medical University from July 2022 to October 2023 were prospectively enrolled. Both AI monitoring by ConView monitor and NI monitoring by Narcotrend monitor were conducted for children after they were admitted to the operating room, while Propofol-remifentanil combined with total intravenous anesthesia was used during the operation and the anesthetic dose was adjusted to maintain the NI value at 40-60. In addition, the AI and NI values were recorded at following time points: quiet eyes closing (T1), the beginning of induction (T2), loss of consciousness (T3), tracheal intubation (T4), the beginning of surgery (T5), during tonsil excision (T6), adenoidectomy (T7), the end of surgery (T8), consciousness recovery (T9) and tracheal extubation (T10). Bland-Altman consistency analysis was used to evaluate the consistency of the results of the two types of anesthesia depth monitoring, AI value and NI value. Receiver operator characteristic (ROC) curve and area under curve (AUC) were used to analyze the predictive efficacy of AI and NI values for the state of consciousness of children. The intraoperative awareness was followed up at 24 hours, 1 week and 1 month after surgery. Results: In 129 cases, there were 78 boys and 51 girls, with an average age of (7.2±3.2) years and an operation time of (72.8±14.0) min. No AI data were missing, but 13 NI data were missing, with a missing rate of 10.1% (13/129). At time points T1-T10, the AI values were 67.5±19.2 and the NI values were 67.2±19.2. Bland-Altman consistency analysis showed that the difference in value between AI and NI was 0.3 (95%CI:-0.1-0.6, P=0.120), with an out-of-consistency range of 4.0% (51/1 290). Before anesthesia induction, AI and NI values were maintained at a high level; with the beginning of anesthesia induction and the disappearance of the children's consciousness, both AI and NI values gradually decreased; after discontinuing the infusion of anesthetics, the values of AI and NI gradually increased, and the change trend of AI and NI in each stage of the perioperative period was consistent, and there was no significant difference between the two groups at each time point (all P>0.05). ROC curve analysis showed that the cut-off value for predicting the state of consciousness using AI was 72.5, with an AUC of 0.73 (95%CI: 0.70-0.75), and the cut-off value of NI was 79.5 and the AUC was 0.74 (95%CI: 0.72-0.77). There was no significant difference in AUC between the two indices (P=0.310). None of the children had intraoperative awareness. Conclusion: Both AI and NI can be used to monitor the depth of anesthesia in pediatric tonsil/adenoidectomy with high accuracy.

Expert's tips on regional blocks in neonates and infants.

Pediatric regional anesthesia (RA) has emerged as a rapidly advancing dimension within pediatric anesthesia, demanding a continual commitment to knowledge acquisition. This review underscores the contemporary significance of this specialty, focusing on its application in neonates and infants. The primary objective of RA is to address perioperative pain effectively while preserving the delicate physiological balance, thereby enhancing overall patient care. This review explores the advantages offered by RA in this age group. Furthermore, conventional, and recently introduced techniques of RA are examined by exploring the advantages and disadvantages of these methods. The aim is to provide clinicians with a nuanced understanding of their applicability in different clinical scenarios. Additionally, the review elucidates the unique considerations associated with pediatric RA, acknowledging pediatric patients' distinctive anatomical and physiological characteristics. The exceptional cases of congenital anomalies and their implications for the choice of RA are considered. An aspect of the review is its focus on dosages of local anesthetics and the volumes required for various blocks in neonates and infants. The dosages for continuous infusion and practical issues with infusions are considered. Complications due to RA are described with their prevention and treatment. The review offers pragmatic insights into the selection criteria for various regional blocks, aiding anesthesiologists in making informed decisions tailored to individual patient needs.

Impact of low-dose sevoflurane with propofol-based anaesthesia on motor-evoked potentials in infants: protocol for a single-centre randomised controlled study

IntroductionMotor-evoked potentials (MEP) are widely used to mitigate the risk of nerve injury resulting from surgical manipulation. Infants are more susceptible to anaesthetics that suppress MEP because of the immaturity...

Cannabis Use and Inhalational Anesthesia Administration in Older Adults: A Propensity-matched Retrospective Cohort Study.

Cannabis use is associated with higher intravenous anesthetic administration. Similar data regarding inhalational anesthetics are limited. With rising cannabis use prevalence, understanding any potential relationship with inhalational anesthetic dosing is crucial. Average intraoperative isoflurane or sevoflurane minimum alveolar concentration equivalents between older adults with and without cannabis use were compared. The electronic health records of 22,476 surgical patients 65 yr or older at the University of Florida Health System between 2018 and 2020 were reviewed. The primary exposure was cannabis use within 60 days of surgery, determined via (1) a previously published natural language processing algorithm applied to unstructured notes and (2) structured data, including International Classification of Diseases codes for cannabis use disorders and poisoning by cannabis, laboratory cannabinoids screening results, and RxNorm codes. The primary outcome was the intraoperative time-weighted average of isoflurane or sevoflurane minimum alveolar concentration equivalents at 1-min resolution. No a priori minimally clinically important difference was established. Patients demonstrating cannabis use were matched 4:1 to non-cannabis use controls using a propensity score. Among 5,118 meeting inclusion criteria, 1,340 patients (268 cannabis users and 1,072 nonusers) remained after propensity score matching. The median and interquartile range age was 69 (67 to 73) yr; 872 (65.0%) were male, and 1,143 (85.3%) were non-Hispanic White. The median (interquartile range) anesthesia duration was 175 (118 to 268) min. After matching, all baseline characteristics were well-balanced by exposure. Cannabis users had statistically significantly higher average minimum alveolar concentrations than nonusers (mean ± SD, 0.58 ± 0.23 vs. 0.54 ± 0.22, respectively; mean difference, 0.04; 95% confidence limits, 0.01 to 0.06; P = 0.020). Cannabis use was associated with administering statistically significantly higher inhalational anesthetic minimum alveolar concentration equivalents in older adults, but the clinical significance of this difference is unclear. These data do not support the hypothesis that cannabis users require clinically meaningfully higher inhalational anesthetics doses.

Pengaruh Murottal Al-Qur’an tehadap Dosis Obat Anestesi Umum dan Waktu Pulih Sadar pada Pasien Operasi di Rumah Sakit Ibnu Sina Makassar

General anesthesia is used to facilitate surgery by providing hypnotic effects, analgesic effects, and muscle relaxation effects. To provide an adequate hypnotic, analgesia and relaxation effect, an adequate dose is needed. The time to recover consciousness after anesthesia is determined by the volume of fluid in the body, drug metabolism, half-life of the drug, age, and pre-anesthesia status. Murottal Al-Qur'an is a non-pharmacological therapy that can reduce stress hormones, increase feelings of relaxation, divert feelings of fear, improve the body's chemical balance thereby reducing hemodynamics. The aim of this study was to determine the effect of murottal Al-Qur'an on the dose of general anesthesia and the time to recover consciously in surgical patients at Ibnu Sina Hospital, Makassar. The research method is cross sectional with a quantitative approach. Each group measured the level of sedation using a Ramsay score of 3 or 4, then calculated the time to recover consciousness. The control group was given 1 mg ± 2 mg midazolam until they reached a Ramsay score of 3 or 4, the treatment group was given Al-Qur'an murottal and 1 mg ± 2 mg midazolam until they reached a Ramsay score of 3 or 4. So the time to recover consciousness and the onset of sedation was fast. These results show the influence of murottal Al-Qur'an on the dose of general anesthesia and the time to recover consciousness in surgical patients at Ibnu Sina Hospital Makassar.

Real-time analgesic efficacy and factors determining drug requirements of combined spinal-epidural analgesia for labor: a prospective cohort study

PurposeCombined spinal-epidural analgesia (CSEA) is effective but not sufficient for labor pain. This study was conducted to assess the real-time analgesic efficacy, side effects of anesthetic drug dosage, and maternal satisfaction in labor to provide reference for the optimization of labor analgesia.MethodsThis was a prospective, cohort, single-center study that included 3020 women who received CSEA for labor analgesia. The visual analogue scale (VAS) for labor pain, real-time anesthetic drug dosage, side effects, adverse labor outcomes, factors influencing average drug dosage, and maternal satisfaction with CSEA were assessed.ResultsOverall, the VAS labor pain score was lowest at the first hour after the anesthesia was given. After 4 h for primiparas and 3 h for multiparas, the VAS score was greater than 3 but the anesthetic drug dosage did not reach the maximum allowed dosage at the same time. The average anesthetic drug dosage was positively correlated with fever, urinary retention, uterine atony, prolonged active phase, prolonged second stage, assisted vaginal delivery, and postpartum hemorrhage. The average anesthetic drug dosage was the highest in women ≤ 20 years old, those with a body mass index (BMI) ≥ 24.9 kg/m2, and those with a primary or secondary education level.ConclusionAppropriate age guidance and emphasis on education of labor analgesia, weight management during pregnancy, and real-time anesthetic dosage adjustment during labor based on VAS pain score may have positive effects on the satisfaction of labor analgesia.Clinical trial number and registryClinicaltrials.gov (ChiCTR2100051809).

Impact of Sub-Anesthetic Dose of Ketamine on Post Spinal Hypotension in Cesarean Delivery

Abstract Background Spinal anesthesia is the commonest technique used in Cesarean Section (CS) and most frequently associated with maternal hypotension, for whicha lot of techniques have been described to prevent but an effective method is yet to be found. Objectives The aim was to study the effect of using a sub-anesthetic dose of ketamine to prevent post-spinal hypotension in CS delivery. Methods This double-blinded randomized controlled study was conducted on 60 participating parturients who were ASA І, П term pregnant. All the parturients received spinal anesthesia. The parturients were then randomly divided into two equal groups (n = 30 in each); ketamine group received a sub- anesthetic dose of ketamine of 0.5 mg/kg IV bolus in 3 ml saline and control group received the same volume of normal saline IV bolus. Heart Rate (HR) and Mean Arterial blood Pressure (MAP) were recorded at baseline (5 minutes prior to the intrathecal injection), at 5, 10, 15 and 20 minutes after the injection and then every 15 minutes till the end of the operation. Incidences of hypotension and severe hypotension were recorded. The total dose of ephedrine was recorded. Modified Ramsay sedation score was recorded at baseline then 5, 10, 15, 30, 45 minutes after injection and then at the end of the operation. Results The study revealed that ketamine didn’t prevent hypotension, it only delayed it for 10 min compared to control group 5 min. Also, observed that total ephidren dose significantly decreased in ketamine group compared to control group. And sedation scores in the first 30 min were higher in ketamine group. HR wasn’t affected. No changes in APGAR score were noticed between the two groups. No side effects from ketamine except for nystagmus. Conclusion This study concluded that the use of intravenous ketamine in low dose (0.5mg/kg) doesn’t prevent postspinal hypotension but it only decreases ephidren requirements.

Hydromorphone combined with ropivacaine for erector spinae plane block in patients undergoing modified radical mastectomy: A prospective randomized controlled trial.

Combining hydromorphone with ropivacaine in ultrasound-guided erector spinae plane blocks enhances postoperative analgesia and reduces interleukin-6 expression in breast surgery patients. In this study, breast cancer patients undergoing modified radical mastectomy were randomized into 3 groups for anesthesia (30 patients in each group): standard general (group C), Erector Spinae Plane Block (ESPB) with ropivacaine (group R), and ESPB with ropivacaine plus hydromorphone (group HR). Diagnosis: Breast cancer patients. Postsurgery, pain levels, IL-6, anesthetic doses, additional analgesia needs, and recovery milestones were compared to evaluate the efficacy of the ESPB enhancements. The 3 groups were not significantly different in baseline characteristics, operation time, number of cases with postoperative nausea, and serum IL-6 concentrations at T1 (the time of being returned to the ward after surgery). At T2 (at 6:00 in the next morning after surgery), the serum IL-6 concentration in group HR was significantly lower than that in groups R and C (P < .05); the intraoperative doses of remifentanil, sufentanil, and propofol were significantly lower in groups HR and R than those in group C (P < .05); Groups HR and R had significantly lower visual analog scale scores at T3 (4 hours postoperatively), T4 (12 hours postoperatively), and T5 (24 hours postoperatively) than those in group C (P < .05); the proportions of patients receiving postoperative remedial analgesia were significantly lower in groups HR and R than in group C (P < .05); groups HR and R had significantly lower proportions of patients with postoperative nausea than group C (P < .05); the time to the first anal exhaust and the time to the first ambulation after surgery were significantly shorter in groups HR and R than those in group C (P < .05). Hydromorphone combined with ropivacaine for ESPB achieved a greater postoperative analgesic effect for patients receiving MRM under general anesthesia. The combined analgesia caused fewer adverse reactions and inhibited the expression level of the inflammatory factor IL-6 more effectively, thereby facilitating postoperative recovery. ESPB using hydromorphone with ropivacaine improved pain control post-MRM, reduced adverse effects, and more effectively suppressed IL-6, enhancing recovery.

A single center descriptive study of local anesthetic dose in knee arthroplasty: Was there evidence of local anesthetic systemic toxicity?

Study objectiveDescribe dosing of local anesthetic when both a periarticular injection (PAI) and peripheral nerve block (PNB) are utilized for knee arthroplasty analgesia, and compare the dosing of local to suggested maximum dosing, and look for evidence of local anesthetic systemic toxicity (LAST). DesignA single center retrospective cohort study between May 2018 and November 2022. SettingA major academic hospital. PatientsPatients who had both a PAI and PNB while undergoing primary, revision, total, partial, unilateral, or bilateral knee arthroplasty. InterventionsNone. MeasurementsCalculate the dose of local anesthetic given via PAI, PNB, and both routes combined as based on lean body weight and compare that to the suggested maximum dosing. Look for medications, clinical interventions, and critical event notes suggestive of a LAST event. Main resultsThere were 4527 knee arthroplasties where both a PAI and PNB were performed during the study period. When combining PAI and PNB doses, >75% of patients received more than the suggested maximum dose of 3 mg/kg lean body weight. The median local anesthetic dosing over the study period, 4.4 mg/kg (IQR 3.5,5.9), was 147% of the suggested maximum dose (IQR 117,197). There was no conclusive evidence of LAST among any of the patients in the study. ConclusionsOver the course of our study, we had 4527 knee arthroplasties with a median PAI and PNB local anesthetic dose that was 147% of the suggested maximum without any clear clinical evidence of a LAST event.

Impact of neuromuscular block on myocardial injury after non-cardiac surgery (MINS) incidence in the early postoperative stage of older patients undergoing laparoscopic colorectal cancer resection: a randomized controlled study

BackgroundMyocardial injury after non-cardiac surgery (MINS) is a common and serious complication in older patients. This study investigates the impact of neuromuscular block on the MINS incidence and other cardiovascular complications in the early postoperative stage of older patients undergoing laparoscopic colorectal cancer resection.Methods70 older patients who underwent laparoscopic colorectal cancer resection were separated into the deep neuromuscular block group and moderate neuromuscular block group for 35 cases in each group (n = 1:1). The deep neuromuscular block group maintained train of four (TOF) = 0, post-tetanic count (PTC) 1–2, and the moderate neuromuscular block group maintained TOF = 1–2 during the operation. Sugammadex sodium was used at 2 mg/kg or 4 mg/kg for muscle relaxation antagonism at the end of surgery. The MINS incidence was the primary outcome and compared with Fisher's exact test. About the secondary outcomes, the postoperative pain was analyzed with Man-Whitney U test, the postoperative nausea and vomiting (PONV) and the incidence of cardiovascular complications were analyzed with Chi-square test, intraoperative mean artery pressure (MAP) and cardiac output (CO) ratio to baseline, length of stay and dosage of anesthetics were compared by two independent samples t-test.ResultsMINS was not observed in both groups. The highest incidence of postoperative cardiovascular complications was lower limbs deep vein thrombosis (14.3% in deep neuromuscular block group and 8.6% in moderate neuromuscular group). The numeric rating scale (NRS) score in the deep neuromuscular block group was lower than the moderate neuromuscular block group 72 h after surgery (0(1,2) vs 0(1,2), P = 0.018). The operation time in the deep neuromuscular block group was longer (356.7(107.6) vs 294.8 (80.0), min, P = 0.008), the dosage of propofol and remifentanil was less (3.4 (0.7) vs 3.8 (1.0), mg·kg−1·h−1, P = 0.043; 0.2 (0.06) vs 0.3 (0.07), μg·kg−1·min−1, P < 0.001), and the length of hospital stay was shorter than the moderate neuromuscular block group (18.4 (4.9) vs 22.0 (8.3), day, P = 0.028). The differences of other outcomes were not statistically significant.ConclusionsMaintaining different degrees of the neuromuscular block under TOF guidance did not change the MINS incidence within 7 days after surgery in older patients who underwent laparoscopic colorectal cancer resection.Trial registrationThe present study was registered in the Chinese Clinical Trial Registry (10/02/2021, ChiCTR2100043323).

Pharmacokinetics in regional anesthesia.

Pharmacokinetics of local anesthetics are one of the main determinants of success and safety of regional anesthesia and comprise local and systemic distribution phases. This review aims to summarize the latest research findings on this topic in the context of various regional blocks performed for different surgeries and patient populations. Research into local kinetics and systemic absorption of local anesthetics has chiefly been focused on novel fascial plane blocks, especially the erector spinae plane block, as these are increasingly adopted for regional anesthesia and pain management. As their clinical efficacy is very dependent on injection of large volumes of local anesthetic, doses over typically recommended limits are often administered. Fascial plane blocks are the regional anesthesia techniques in need of the most pharmacokinetic characterization, not only to better understand their complex mechanisms of action but also to avoid harm from excessive doses of local anesthetics. Further mapping of risk factors for systemic toxicity from administration in different block sites is crucial. Extremes of age and pregnancy are vulnerable patient populations but in whom regional anesthesia, including novel techniques, has been performed with few complications.

Dorsal raphe nucleus to basolateral amygdala 5-HTergic neural circuit modulates restoration of consciousness during sevoflurane anesthesia

The advent of general anesthesia (GA) has significant implications for clinical practice. However, the exact mechanisms underlying GA-induced transitions in consciousness remain elusive. Given some similarities between GA and sleep, the sleep-arousal neural nuclei and circuits involved in sleep-arousal, including the 5-HTergic system, could be implicated in GA. Herein, we utilized pharmacology, optogenetics, chemogenetics, fiber photometry, and retrograde tracing to demonstrate that both endogenous and exogenous activation of the 5-HTergic neural circuit between the dorsal raphe nucleus (DR) and basolateral amygdala (BLA) promotes arousal and facilitates recovery of consciousness from sevoflurane anesthesia. Notably, the 5-HT1A receptor within this pathway holds a pivotal role. Our findings will be conducive to substantially expanding our comprehension of the neural circuit mechanisms underlying sevoflurane anesthesia and provide a potential target for modulating consciousness, ultimately leading to a reduction in anesthetic dose requirements and side effects.

Optimizing anesthesia strategies to NSCLC patients in VATS procedures: Insights from drug requirements and patient recovery patterns.

Understanding the intricate relationship between cancer clinicopathological features and anesthetics dosage is crucial for optimizing patient outcomes and safety during surgery. This retrospective study investigates this relationship in patients with non-small cell lung cancer (NSCLC) undergoing video-assisted thoracic surgery (VATS). A comprehensive analysis of medical records was undertaken for NSCLC patients who underwent VATS with intravenous compound inhalation general anesthesia. Patients were categorized based on histological, chemotherapy, radiotherapy, and epidural anesthesia factors. Statistical analysis was performed to compare the differences between the groups. The results revealed compelling insights. Specifically, patients with lung adenocarcinoma (LUAD) undergoing VATS exhibited higher dosages of rocuronium bromide and midazolam during general anesthesia, coupled with a shorter post-anesthesia care unit (PACU) stay compared to those with squamous cell carcinoma (sqCL). Furthermore, chemotherapy patients undergoing VATS demonstrated diminished requirements for phenylephrine and remifentanil in contrast to their non-chemotherapy counterparts. Similarly, radiotherapy patients undergoing VATS demonstrated a decreased necessity for rocuronium bromide compared to non-radiotherapy patients. Notably, patients who received epidural anesthesia in combination with general anesthesia manifested reduced hydromorphone requirements and prolonged hospital stays compared to those subjected to general anesthesia alone. In conclusion, the findings from this study indicate several important observations in diverse patient groups undergoing VATS. The higher dosages of rocuronium bromide and midazolam in LUAD patients point to potential differences in drug requirements among varying lung cancer types. Additionally, the observed shorter PACU stay in LUAD patients suggests a potentially expedited recovery process. The reduced anesthetic requirements of phenylephrine and remifentanilin chemotherapy patients indicate distinct responses to anesthesia and pain management. Radiotherapy patients requiring lower doses of rocuronium bromide imply a potential impact of prior radiotherapy on muscle relaxation. Finally, the combination of epidural anesthesia with general anesthesia resulted in reduced hydromorphone requirements and longer hospital stays, suggesting the potential benefits of this combined approach in terms of pain management and postoperative recovery. These findings highlight the importance of tailoring anesthesia strategies for specific patient populations to optimize outcomes in VATS procedures.