The efficacy of surgery for upper airway resistance syndrome: A systematic review, meta-analysis and case series.

PURPOSE: Upper airway resistance syndrome (UARS) is a sleep related breathing disorder that was first described in 1993. This goal of this study is to determine the efficacy of surgical intervention for UARS. MATERIALS AND METHODS: Systematic review of the literature and a case series of UARS patients at a large integrated healthcare system. Meta-analysis was performed. RESULTS: For the systematic review, 971 abstracts were reviewed and 3 articles were included, yielding 49 subjects. All of the included studies were of level 3 or 4 evidence. Significant improvement in Epworth Sleepiness Scale (ESS) score was noted after surgery in two level 4 studies. No significant change in ESS was noted in one level 3 study. Our retrospective chart review of eleven UARS patients compared preoperative and postoperative ESS scores, as well as sleep study data. Patients underwent a variety of surgical procedures. Our findings show a significant improvement in mean ESS scores after surgery, from 11.0 (±3.5) to 7.0 (±4.8) with p = 0.01, though no difference in apnea hypopnea index (AHI) and respiratory disturbance index (RDI) were identified. Meta-analysis was performed on 2 studies from the systematic review and our cases series data. UARS surgery showed a mean change in ESS of -5.89 (95% CI, -8.29 to -3.50). CONCLUSIONS: This systematic review, meta-analysis and retrospective case series indicate that surgery may improve ESS scores in patients with UARS. AHI and RDI are unlikely to be impacted by surgery.

Variations in funding for treatment of obstructive sleep apnoea in England.

OBJECTIVES: This study aimed to review the funding policies of clinical commissioning groups for treatment of obstructive sleep apnoea in England. METHODS: Published policies from a randomly selected sample of 60 out of 190 clinical commissioning groups were reviewed. RESULTS: Continuous positive airway pressure was funded based on a clinical assessment or according to criteria that were in line with national guidelines in most clinical commissioning groups (49 of 60), with 11 clinical commissioning groups offering no policy. Mandibular advancement devices, tonsillectomy and nasal surgery were funded based on a clinical assessment or certain criteria in 16, 25 and 16 clinical commissioning groups, respectively. In contrast, only one clinical commissioning group provided funding for soft palate, tongue base or mandibular surgery. Hypoglossal nerve stimulation was not mentioned in any clinical commissioning group's policy. CONCLUSION: Although most clinical commissioning groups provide funding for the use of continuous positive airway pressure, the availability of funding for other obstructive sleep apnoea treatment modalities is heterogeneous, leaving continuous positive airway pressure intolerant patients with limited therapeutic options in some regions.

Overstay and Readmission in Ear, Nose, and Throat Day Surgery-Factors Affecting Postanesthesia Course.

AIMS: Many procedures in ear, nose, and throat (ENT) day surgery are carried out under local anesthesia in Finland, whereas many other countries use general anesthesia. We investigated overstay and readmission rates in local and general anesthesia at Helsinki University Hospital. MATERIAL AND METHODS: We conducted a retrospective study on ENT (n = 1011) day surgery patients within a 3-month period using the hospital's surgery database to collect data pertaining to anesthesia, overstays, readmissions, and contacts within 30 days of surgery. OBJECTIVES: We examined the effect of American Society of Anesthesiologists (ASA) class, age, sex, type of procedure, and anesthesia type on overstay, contact, and readmission rates. RESULTS: A multivariable logistic regression model included ASA class, age, sex, type of procedure, and anesthesia (local vs general). Sex, age, and type of procedure had an effect on the outcomes of overstay, readmission, or contact. With general anesthesia, 3.2% (n = 23) had an overstay or readmission compared to 1.4% (n = 4) after local anesthesia. This was mainly explained by the number of study outcomes in tonsillar surgery that was performed only in general anesthesia. CONCLUSIONS: Day surgery could be done safely using local anesthesia, as the number of study outcomes was no greater than in general anesthesia. Sex, type of procedure, and age affected the rate of study outcomes, but ASA class and anesthesia form did not. Our overstay, contact, and readmission rates are on the same level, or lower, than in international studies.

Efficacy of Rhino-Protect ointment after endoscopic sinus surgery: a prospective, randomized, multicenter study.

OBJECTIVE: Blocking airflow into the sinonasal cavity after surgery may help to keep the cavity moist and thus decrease postoperative crusting. Here we investigated the efficacy of Rhino-Protect ointment following endoscopic sinus surgery (ESS). SUBJECTS AND METHODS: A total of 93 patients with chronic rhinosinusitis who underwent identical ESS were enrolled. After surgery, all patients were instructed to perform nasal saline irrigation and deliver a nasal spray to each nostril, then to apply Rhino-Protect ointment to one nostril only; the other nostril served as a control. Subjective symptoms, postoperative Lund-Kennedy (LK) endoscopic scores, and adverse reactions 14 and 28 days after treatment were evaluated. RESULTS: The Rhino-Protect ointment significantly reduced pain (p = 0.015 at 28 days), dryness (p = 0.009 at 14 days and p = 0.045 at 28 days), and crusting (p = 0.047 at 14 days), and was associated with significantly lower LK scores 14 and 28 days after treatment (p = 0.037 and p = 0.007, respectively). Statistically significant differences were noted in the LK edema subscore at 14 days (p = 0.043) and in LK crusting subscores at 14 and 28 days (p = 0.005 and p = 0.006, respectively). No patient reported any serious adverse event associated with Rhino-Protect use. CONCLUSION: Applying Rhino-Protect after ESS significantly reduced the formation of edema and crusts, leading to improving the patients' discomfort for pain, dryness, and crust.

Comparison of Traditional Upper Airway Surgery and Upper Airway Stimulation for Obstructive Sleep Apnea.

OBJECTIVE: To compare patients with moderate-severe obstructive sleep apnea (OSA) undergoing traditional single and multilevel sleep surgery to those undergoing upper airway stimulation (UAS). STUDY DESIGN: Case control study comparing retrospective cohort of patients undergoing traditional sleep surgery to patients undergoing UAS enrolled in the ADHERE registry. SETTING: 8 multinational academic medical centers. SUBJECTS AND METHODS: 233 patients undergoing prior single or multilevel traditional sleep surgery and meeting study inclusion criteria were compared to 465 patients from the ADHERE registry who underwent UAS. We compared preoperative and postoperative demographic, quality of life, and polysomnographic data. We also evaluated treatment response rates. RESULTS: The pre and postoperative apnea hypopnea index (AHI) was 33.5 and 15 in the traditional sleep surgery group and 32 and 10 in the UAS group. The postoperative AHI in the UAS group was significantly lower. The pre and postoperative Epworth sleepiness scores (ESS) were 12 and 6 in both the traditional sleep surgery and UAS groups. Subgroup analysis evaluated those patients undergoing single level palate and multilevel palate and tongue base traditional sleep surgeries. The UAS group had a significantly lower postoperive AHI than both traditional sleep surgery subgroups. The UAS group had a higher percentage of patients reaching surgical success, defined as a postoperative AHI <20 with a 50% reduction from preoperative severity. CONCLUSION: UAS offers significantly better control of AHI severity than traditional sleep surgery. Quality life improvements were similar between groups.

Evaluation of Surgical Learning Curve Effect on Obstructive Sleep Apnea Outcomes in Upper Airway Stimulation.

OBJECTIVE: An increasing number of facilities offer Upper Airway Stimulation (UAS) with varying levels of experience. The goal was to quantify whether a surgical learning curve exists in operative or sleep outcomes in UAS. METHODS: International multi-center retrospective review of the ADHERE registry, a prospective international multi-center study collecting UAS outcomes. ADHERE registry centers with at least 20 implants and outcomes data through at least 6-month follow-up were reviewed. Cases were divided into two groups based on implant order (the first 10 or second 10 consecutive implants at a given site). Group differences were assessed using Mann-Whitney U-tests, Chi-squared tests, or Fisher's Exact tests, as appropriate. A Mann-Kendall trend test was used to detect if there was a monotonic trend in operative time. Sleep outcome equivalence between experience groups was assessed using the two one-sided tests approach. RESULTS: Thirteen facilities met inclusion criteria, contributing 260 patients. Complication rates did not significantly differ between groups (P = .808). Operative time exhibited a significant downward trend (P < .001), with the median operative time dropping from 150 minutes for the first 10 implants to 134 minutes for the subsequent 10 implants. The decrease in AHI from baseline to 12-month follow-up was equivalent between the first and second ten (22.8 vs 21.2 events/hour, respectively, P < .001). Similarly, the first and second ten groups had equivalent ESS decreases at 6 months (2.0 vs 2.0, respectively, P < .001). ESS outcomes remained equivalent for those with data through 12-months. CONCLUSIONS: Across the centers' first 20 implants, an approximately 11% reduction operative time was identified, however, no learning curve effect was seen for 6-month or 12-month AHI or ESS over the first twenty implants. Ongoing monitoring through the ADHERE registry will help measure the impact of evolving provider and patient specific characteristics as the number of implant centers increases.

Active Observation as an Alternative to Invasive Treatments for Pediatric Head and Neck Lymphatic Malformations.

OBJECTIVES: An increasing number of treatment modalities for lymphatic malformations are being described, complicating therapeutic decisions. Understanding lymphatic malformation natural history is essential. We describe management of head and neck lymphatic malformations where decisions primarily addressed lesion-induced functional compromise (ie, breathing, swallowing) to identify factors associated with invasive treatment and active observation. We hypothesize that non-function threatening malformations can be observed. STUDY DESIGN: Retrospective case series. METHODS: Retrospective case series of consecutive head and neck lymphatic malformation patients (2000-2017) with over 2 years of follow-up. Patient characteristics were summarized and associations with invasive treatment (surgery or sclerotherapy) tested using Fisher's exact. In observed patients, factors associated with spontaneous regression were assessed with Fisher's exact test. RESULTS: Of 191 patients, 101 (53%) were male, 97 (51%) Caucasian, and 98 (51.3%) younger than 3 months. Malformations were de Serres I-III 167 (87%), or IV-V 24 (12%), and commonly located in the neck (101, 53%), or oral cavity (36, 19%). Initial treatments included observation (65, 34%) or invasive treatments such as primary surgery (80, 42%), staged surgery (25, 13%), or primary sclerotherapy (9, 5%). Of 65 initially observed malformations, 8 (12%) subsequently had invasive treatment, 36 (58%) had spontaneous regression, and 21 (32%) elected for no invasive therapy. Spontaneous regression was associated with location in the lateral neck (P = .003) and macrocystic malformations (P = .017). CONCLUSION: Head and neck lymphatic malformation treatment selection can be individualized after stratifying by stage, presence of functional compromise, and consideration of natural history. Recognizing the spectrum of severity is essential in evaluating efficacy of emerging treatments, as selected malformations may respond to observation. LEVEL OF EVIDENCE: 4 Laryngoscope, 131:1392-1397, 2021.

Shikani Optical Stylet for Awake Nasal Intubation in Patients Undergoing Head and Neck Surgery.

OBJECTIVES: To evaluate the efficacy and safety of the Shikani optical stylet (SOS) versus fiberoptic bronchoscope (FOB) for awake nasal intubation in head and neck surgery patients with an anticipated difficult airway. STUDY DESIGN: Prospective randomized clinical trial. METHODS: This study involved 50 adult patients scheduled for elective head and neck surgery and presented with an anticipated difficult airway. Patients planned for awake nasotracheal intubation were randomly divided into two groups: FOB (n = 25) and SOS (n = 25). Patients were intubated under local anesthesia and sedation using the randomly assigned intubation device by anesthetists proficient in both airway devices. The time to successful intubation was regarded as the primary endpoint. RESULTS: The median time (interquartile range) to tracheal intubation in the FOB group was 74 seconds (57-108) and 38 seconds (27-60) in the SOS group (P < .001). Intubation success rates on the first attempt in the FOB and SOS groups were 96% and 92%, respectively (P > .999). Airway assisted maneuvers were required in six (24%) SOS intubations compared to 21 (84%) FOB intubations (P < .001). There were no significant differences between the groups in the incidences of oxygen desaturation and postoperative complications related to intubation. CONCLUSION: Compared to the FOB group, awake nasal intubation in the SOS group required significantly less time and fewer airway-assisted maneuvers on adult head and neck surgery patients with anticipated difficult airway. LEVEL OF EVIDENCE: 2 Laryngoscope, 131:319-325, 2021.

Prioritizing Diversity in Otolaryngology-Head and Neck Surgery: Starting a Conversation.

Academic centers embody the ideals of otolaryngology and are the specialty's port of entry. Building a diverse otolaryngology workforce-one that mirrors society-is critical. Otolaryngology continues to have an underrepresentation of racial and ethnic minorities. The specialty must therefore redouble efforts, becoming more purposeful in mentoring, recruiting, and retaining underrepresented minorities. Many programs have never had residents who are Black, Indigenous, or people of color. Improving narrow, leaky, or absent pipelines is a moral imperative, both to mitigate health care disparities and to help build a more just health care system. Diversity supports the tripartite mission of patient care, education, and research. This commentary explores diversity in otolaryngology with attention to the salient role of academic medical centers. Leadership matters deeply in such efforts, from culture to finances. Improving outreach, taking a holistic approach to resident selection, and improving mentorship and sponsorship complement advances in racial disparities to foster diversity.

Comparison of the efficacy of two different local anesthetics in inferior turbinate reduction.

PURPOSE: The present study compares the local anesthetic efficacy of EMLA® cream and lidocaine injection used in the radiofrequency reduction of the inferior turbinate. METHODS: The study included a total of 124 patients with inferior turbinate hypertrophy and who underwent turbinate reduction under local anesthesia. The operations were performed 15 min after a lidocaine injection and 30 min after EMLA cream application. The respondent patients were asked to interpret such situations as intraoperative pain, discomfort during the procedure, choking sensation and difficulty swallowing using the Visual Analogue Scale (VAS). RESULTS: The EMLA cream patients (Group A) were found to have a lower level of discomfort, choking sensation and difficulty swallowing than the lidocaine patients (Group B), while there was no substantial difference in pain between the two groups. CONCLUSIONS: It is concluded that EMLA® cream is an effective alternative to lidocaine injection during inferior turbinate reduction procedures.

Restructuring ENT out-patient services during the coronavirus disease 2019 pandemic - an iterative approach.

BACKGROUND: Coronavirus disease 2019 has demanded enormous adjustments to National Health Service provisions. Non-urgent out-patient work was initially postponed or performed virtually, but is now being re-established. In ENT surgery, aerosol-generating procedures pose a particular challenge in out-patient settings. OBJECTIVE: A rapid restructuring of ENT out-patient services is required, to safely accommodate aerosol-generating procedures and increase in-person attendances, whilst coronavirus disease 2019 persists. METHODS: Data were collected prospectively over four consecutive cycles. Two surveys were conducted. Results were analysed and disseminated, with recommendations for service restructuring implemented at cycle end-points. RESULTS: Out-patient activity increased four-fold, associated with a significant rise in aerosol-generating procedures during the study period. Mean aerosol-generating procedure duration dropped weekly, implying a learning curve. Service restructuring occurred at cycle end-points. CONCLUSION: Iterative data gathering, results analysis and outcome dissemination enabled a swift, data-driven approach to the restructuring of ENT out-patient services. Patient and staff safety was ensured, whilst out-patient capacity was optimised.

Evaluation of Acupuncture's Efficacy Within Otolaryngology.

OBJECTIVES: Acupuncture is a form of Traditional Chinese Medicine that has minimal side effects, is cost-effective, can be easily administered, and may serve as a useful non-pharmaceutical therapy for certain conditions. However, studies and clinical practice guidelines are inconsistent in conclusions and recommendations about acupuncture. This qualitative review addresses the evidence available for acupuncture use in otolaryngology. METHODS: A literature review was completed using EMBASE, PubMed, and The Cochrane Collection for conditions within otolaryngology that have used and studied the comparative effects of acupuncture. Thirty studies ultimately fit the inclusion criteria and were used for this qualitative review. RESULTS: Studies included in this review contained a variety of conditions within otolaryngology, including allergic rhinitis, chronic rhinitis, tinnitus, sudden sensorineural hearing loss, post-viral olfactory dysfunction, dysphonia, and tonsillectomies. CONCLUSION: Given its safety profile, cost, and perceived benefit, recommendations and guidelines supporting acupuncture as an alternative or adjunctive therapy are surfacing for certain conditions such as allergic rhinitis. However, stronger conclusions with specific recommendations are limited by varied methodology between majority of the studies. Additional high-quality randomized control studies with low risk of bias are required to continue to assess the effects of acupuncture in the field of otolaryngology before stronger recommendations can be made on other conditions.

Topical anesthetic techniques in office-based laryngeal surgery: A comparison of patient preferences.

OBJECTIVES: Multiple topical anesthesia techniques exist for office-based laryngeal surgery. Our objective was to assess patient and surgeon satisfaction for three different techniques. STUDY DESIGN: Cohort study. METHODS: All consecutive patients presenting to an outpatient laryngology office for awake surgical procedures were enrolled. Patients were anesthetized with local anesthesia (2 cubic centimeters of 4% lidocaine) in one of three ways: 1) nebulizer, 2) flexible cannula through a channeled laryngoscope, or 3) transtracheal instillation. Demographics, procedure times, and surgeon satisfaction were recorded. A validated 11-item patient satisfaction questionnaire (Iowa Satisfaction with Anesthesia Survey) was administered after the procedure to calculate an overall satisfaction score (-3[worst] to 3[best]). Descriptive and correlative statistics were performed. RESULTS: One hundred consecutive patients were included (37 females, 73 males), with relatively equal numbers between groups (32 nebulizer, 35 cannula, 33 transtracheal). Seven procedures were aborted (4 nebulizer, 2 cannula, 1 transtracheal) due to movement, anxiety, or technical issues. Three patients did not adequately complete the survey. Of the 90 remaining patients, patient satisfaction was highest with the transtracheal technique (2.04) versus cannula (1.46) or nebulizer (1.45), and this was statistically significant (P = 0.0167). This difference was driven by decreased pain and nausea scores in the transtracheal group. Surgeon satisfaction was lower with nebulizer and higher with transtracheal injection (P = 0.0081). There was a correlation between surgeon satisfaction and patient satisfaction (P < 0.0001). CONCLUSION: Transtracheal instillation was favored by both patients and the surgeon. Choice of local anesthetic techniques may impact patient preferences and surgical success. This may serve as a basis for optimizing anesthetic care in office-based laryngeal surgery. LEVEL OF EVIDENCE: 4 Laryngoscope, 130:166-170, 2020.

Neck Surgery with Hypnosis: An Evaluation Based Upon Patient's Self Assessment.

BACKGROUND: Surgery with hypnosis avoids the use of general anesthesia (GA). It also shortens hospitalization and promotes outpatient surgery. The objective of this study has been to assess the satisfaction of operated patients. No previous study has focused on patient satisfaction in a prospective design. METHODS: In this prospective, non-randomized, observational study, all patients operated with hypnosis between 2009 and 2017 in the Ear, Nose, and Throat department of a tertiary care hospital were selected. All patients were asked to fill a questionnaire based on a previously validated questionnaire incremented with complementary questions. Questionnaires were completed immediately after surgery for 31 patients and after 6 months for 20 patients. Global Satisfaction Index (GSI) was self-assessed on a scale ranging from 1 to 10. Patients were asked; whether they felt comfortable during the operation, whether hypnosis helped them, whether the experience matched their expectations, whether they would revisit or recommend it to someone else and whether they considered to have been sufficiently informed before the procedure. The data was analyzed using a linear regression model with P < .05 considered as statistically significant. RESULTS: During the inclusion period, no patient required conversion to GA. A total of 48 questionnaires were evaluated. The median of the GSI was 8/10. GSI significantly correlated with patient comfort (P < 0.0001) and quality of preoperative information (P = .002). The percentage of patients who found hypnosis helpful correlated with the duration of surgery (P = .04). The probability for a patient to consider hypnosis as an experience matching their expectation increased with surgical team experience OR 0.55 (0.3-0.9). CONCLUSION: This study reveals that patients' global satisfaction after hypnosis is high. This is significantly related to the quality of preoperative information and to the experience of the surgical team. It also suggests that patients are more likely to benefit from hypnosis if the surgery is longer.

Office-based vs. operating room-performed laryngopharyngeal surgery: a review of cost differences.

PURPOSE: Office-based transnasal flexible endoscopic surgery under topical anesthesia has recently been developed as an alternative for transoral laryngopharyngeal surgery under general anesthesia. The aim of this study was to evaluate differences in health care costs between the two surgical settings. METHODS: PubMed, EMBASE and Cochrane Library were searched for studies reporting on costs of laryngopharyngeal procedures that could either be performed in the office or operating room (i.e., laser surgery, biopsies, vocal fold injection, or hypopharyngeal or esophageal dilation). Quality assessment of the included references was performed. RESULTS: Of 2953 identified studies, 13 were included. Quality assessment revealed that methodology differed significantly among the included studies. All studies reported lower costs for procedures performed in the office compared to those performed in the operating room. The variation within reported hospital and physician charges was substantial. CONCLUSION: Office-based laryngopharyngeal procedures under topical anesthesia result in lower costs compared to similar procedures performed under general anesthesia.

[Study on the effect of in vitro cultured calculus bovis in perioperative period after H-UPPP operation].

Objective:TThe aim of this study is to investigate the effect of in vitro cultured Calculus Bovis on the inflammation of oropharynx and body in patients with OSA during the perioperative period of H-UPPP.Method:Eighty patients with OSA and H-UPPP indications were enrolled. The patients were divided into experimental group and control group by random number table, 40 cases in each group. The experimental group was given in vitro cultured Calculus Bovis, while the control group was not given bovine bezoar in vitro. The postoperative oropharyngeal pain, time to resume normal diet, local edema, concentration of IL-1ß, IL-8 and TNF-α in saliva, and concentration of IL-1ß, IL-8 and TNF-α in blood were compared between the two groups. Result:The pain of oropharynx in the experimental group was lighter than that in the control group on the 3rd, 5th and 7th day after operation (P<0.05), but there was no significant difference in the pain of oropharynx between the two groups on the 1st day after operation(P>0.05); the time of restoring normal diet in the experimental group was shorter than that in the control group (P<0.05); the edema of oropharynx in the experimental group was lighter than that in the control group on the 5th and 7th day after operation (P<0.05).The levels of IL-1ß, IL-8 and TNF-α in saliva were lower than those in control group on the 3rd, 5th and 7th day after operation (P<0.05), and the levels of IL-1ß, IL-8 and TNF-α in blood on the 5th and 7th day after operation were lower than those in control group (P<0.05).Conclusion:In vitro perioperative period of H-UPPP can improve the postoperative sore throat and local edema of oropharynx, shorten the time of normal diet and reduce the expression of related inflammatory factors in oropharynx and blood.

A local safety standard for invasive procedures for out-patient endonasal procedures performed under local anaesthetic: a template from Newcastle upon Tyne hospitals.

BACKGROUND: In November 2017, a working feasibility analysis commenced of a local anaesthetic endonasal procedures out-patient clinic service at Freeman Hospital, Newcastle upon Tyne. Fundamental to introducing an innovative ambulatory out-patient practice is the development of a novel local safety standard for invasive procedures to support this service. OBJECTIVE: This paper presents the new safety standard developed for this purpose and implemented in our institution. CONCLUSION: Increasingly, there is a shift toward ambulatory services, directed by patient choice, technological advances and the opportunity for cost savings. It is hoped that this local safety standard for invasive procedures will provide a useful template for those considering implementing ambulatory endonasal services, or other novel procedures, within the specialty of ENT.

Effect of pretreatment with magnesium sulphate on the duration of intense and deep neuromuscular blockade with rocuronium: A randomised controlled trial.

BACKGROUND: Magnesium sulphate is an important adjuvant drug in multimodal anaesthesia. In combination with rocuronium it can enhance neuromuscular blockade (NMB). Limited data exist concerning the effect of magnesium sulphate on the duration of deep or intense NMB and the period of no response. OBJECTIVE(S): To determine the role of magnesium sulphate on the duration of rocuronium-induced deep and intense NMB, and the period of no response to nerve stimulation. DESIGN: A randomised controlled trial. SETTING: A public tertiary care hospital, Rio de Janeiro, Brazil, from February 2017 to March 2018. PATIENTS: All patients between 18 and 65 years of age scheduled to undergo elective otorhinolaryngological surgery, with a BMI between 18.5 and 24.9 kg m and an American Society of Anesthesiologists physical status classification of I or II. INTERVENTION(S): Before induction of anaesthesia 60 patients were pretreated with an intravenous infusion of either 100 ml 0.9% saline (saline group), or 60 mg kg magnesium sulphate (magnesium group). After loss of consciousness, a bolus of rocuronium (0.6 mg kg) was administered. Neuromuscular function was measured by TOF-Watch SX monitor. MAIN OUTCOME MEASURES: The primary and secondary outcomes were the duration of the period of no response to nerve stimulation and intense and deep NMB, respectively. An additional outcome was the NMB onset time. RESULTS: Median [IQR] durations of deep NMB were 20.3 [12.0 to 35.4] and 18.3 [11.2 to 26.3] min in the magnesium and saline groups, respectively (P = 0.18). Median durations of intense NMB were 21.7 [0.0 to 32.2] min and 0.0 [0.0 to 6.2] min (P = 0.001) in the magnesium and saline groups, respectively. Median durations of the period of no response were 40.8 [51.4 to 36.0] min and 28.0 [21.9 to 31.6] min (P = 0.0001) in the magnesium and saline groups, respectively. CONCLUSION: Magnesium sulphate increased both the duration of intense NMB and the period of no response. The duration of deep NMB was similar in the magnesium sulphate group and saline group. TRIAL REGISTRATION: ClinicalTrials.gov identifier: NCT02989272.