Naida Cole

All Publications

• Ambulation during Neuraxial Analgesia in Obese Patients: A Pilot Study. American journal of perinatology Suresh, S., Seiler, F. A., Arnolds, D., Gonzalez, M., Cole, N., Silver, R., Scavone, B., Dude, A. 2026; 43 (1): 122-124

  Abstract

  Prior studies have yielded mixed results regarding ambulation with neuraxial analgesia and labor outcomes, and studies did not include a significant obese population. We sought to evaluate the feasibility of ambulation with optimized neuraxial analgesia in laboring nulliparous obese patients.This was a pilot study at the University of Chicago (approval no.: IRB 19-1600, CT NCT04504682). Inclusion criteria were delivery BMI of ≥35 kg/m2, nulliparity, and term gestation. Contraindications to ambulation or vaginal delivery conferred ineligibility. Combined spinal-epidural analgesia was initiated per our institution's policy. Following epidural catheter placement, serial blood pressure measurements and motor assessments including a straight leg test and a step stool test were completed per safety protocol. Patients who passed these assessments were enrolled. Patients were encouraged to ambulate for 20 minutes every hour while on fetal and uterine telemetry. Ambulation was discouraged after complete dilation. Demographics and delivery outcomes were collected. Our primary objective was to evaluate feasibility through acceptability, and safety via the number of falls, and percentage of patients with any ambulation. The study was closed early due to enrollment difficulties and in the setting of the COVID-19 pandemic.A total of 105 patients were identified for the trial: 20 were ineligible for the study, 20 could not be approached, and 40 declined study participation, leaving 25 patients who consented. Of those 25, 14 completed the study. Out of 14 participants, 11 were ambulated. The average BMI of these participants was 43 kg/m2. No patients fell during the trial.A pilot trial of ambulation during neuraxial analgesia among an obese nulliparous population demonstrated no safety concerns, but with concern regarding feasibility as there was low acceptance. · Pilot trial of ambulation with neuraxial analgesia among obese patients had limited enrollment.. · Trial of ambulation with epidural among obese nulliparous patients demonstrated no safety concerns.. · Further studies are needed for efficacy..

  View details for DOI 10.1055/a-2516-2292

  View details for PubMedID 39929200

• Closed-loop vasopressor systems for hemodynamic stability during cesarean delivery and maternal and neonatal outcomes: a systematic review and meta-analysis. International journal of obstetric anesthesia Khan, M. J., Hassan, J., Karmakar, A., Khan, M., Dean, C. T., Scavone, B. M., Cole, N. M. 2025; 64: 104768

  Abstract

  Closed-loop vasopressor systems automate vasopressor administration using real-time hemodynamic biofeedback; clinical equipoise exists between closed-loop vasopressor systems and manual vasopressor titration. This review evaluates the performance and hemodynamic outcomes of closed-loop vasopressor systems vs. manual titration in cesarean delivery under spinal anesthesia.Included studies compared closed-loop vasopressor systems with manual vasopressor administration for spinal hypotension in cesarean delivery. Primary outcomes were closed-loop vasopressor systems performance and hemodynamic measures. Performance was assessed with median performance error, median absolute performance error, wobble (intraindividual variation in performance error) and divergence (performance error over time). Meta-analyses were conducted for RCTs and observational studies separately. Risk of bias was assessed using Cochrane methodology. Data were reported as risk ratio (RR) or mean difference (MD) with 95 % confidence intervals (CI).Seven studies (n = 864) were included. In three RCTs (n = 654), wobble (MD -0.66 %; 95 % CI -1.29 to -0.02; P = 0.04), hypotension incidence (RR 0.67; 95 % CI 0.55 to 0.82; P < 0.01), and the highest and lowest systolic blood pressures values (MD -4.05 mmHg; 95 % CI -7.03 to -1.06; P < 0.01 and MD 5.39 mmHg; 95 % CI 2.17 to 8.60; P < 0.01, respectively) were minimized with closed-loop vasopressor systems, but no significant differences were observed in other primary outcomes. Maternal nausea was reduced with closed-loop vasopressor systems (RR 0.47; 95 % CI 0.26 to 0.85; P = 0.01; moderate quality of evidence). In four observational studies (n = 210), the pooled values for median absolute performance error, wobble, divergence of the system, hypotension incidence, highest and lowest systolic blood pressures, highest and lowest heart rates, total fluids, total phenylephrine and ephedrine dosages were statistically significant. Risk of bias was low to moderate for all studies.Closed-loop vasopressor systems may improve systolic blood pressure fluctuations in cesarean deliveries with spinal anesthesia compared to manually adjusted vasopressor dosing; however, more high-quality evidence is needed.

  View details for DOI 10.1016/j.ijoa.2025.104768

  View details for PubMedID 40992207

• In Reply. Obstetrics and gynecology Cole, N. M., Kim, J. J., Bateman, B. T. 2025; 145 (3): e123-e124

  View details for DOI 10.1097/AOG.0000000000005833

  View details for PubMedID 39977865

• Bioequivalence and pharmacokinetics of intravenous calcium during cesarean delivery. Anesthesiology Ansari, J. R., Conti, D. J., Michel, G., Yarmosh, A., Cole, N. M., Shafer, S. L. 2024

  Abstract

  BACKGROUND: Few studies have assessed the dose ratio of calcium gluconate to calcium chloride or defined the time course of change in serum ionized calcium concentration after intravenous injection.METHODS: In a bioequivalence (dose ratio) trial, parturients undergoing cesarean delivery were randomly assigned to receive calcium chloride 0.5 grams or calcium gluconate 1.5 or 2 grams by 10-minute intravenous infusion. Venous serum ionized calcium concentration was measured prior to calcium infusion and approximately 5, 10, 15, 30, and 60 minutes after infusion start. We combined these data with serum ionized calcium concentration measurements in parturients who received 1 gram calcium chloride or saline placebo in two recent clinical trials to define the pharmacokinetics of intravenous calcium over the first hour during and after drug administration.RESULTS: The bioequivalence study enrolled 34 participants, from whom we collected 181 serum ionized calcium concentration measurements. The dose ratio of calcium gluconate to calcium chloride was 3.11 (95% CI: 2.77-3.48). Population pharmacokinetics of calcium were determined using 311 serum ionized calcium concentration measurements from 70 parturients. The pharmacokinetics of intravenous calcium were described by a two-compartment model with systemic clearance of 0.18 (95% CI: 0.07-0.27) L/min, distributional clearance of 1.25 (95%CI: 1.03-1.56) L/min, central volume of 10.9 (95% CI: 9.3-12.6) L, and peripheral volume of 16.5 (95% CI: 12.5-24.7) L. After adjusting for the dose ratio, calcium gluconate and calcium chloride had identical time courses. A one-gram infusion of calcium chloride results in a peak increase in serum ionized calcium concentration of 0.39 (0.38-0.42 mmol/L), which decreases by half 29 (23-40) minutes after initiation of the 10-minute infusion.CONCLUSIONS: We confirmed a 3:1 dose ratio of calcium gluconate to calcium chloride and estimated the pharmacokinetics over the first hour following intravenous delivery. These data inform clinical care and may guide future trials assessing calcium efficacy to reduce bleeding in obstetric patients.CLINICALTRIALS.GOV REGISTRATION: NCT05973747 (bioequivalence), NCT05027048, and NCT03867383 (trials included in pharmacokinetic assessment).

  View details for DOI 10.1097/ALN.0000000000005248

  View details for PubMedID 39361822

• Second-Line Uterotonics for Uterine Atony: A Randomized Controlled Trial. Obstetrics and gynecology Cole, N. M., Kim, J. J., Lumbreras-Marquez, M. I., Fields, K. G., Mendez-Pino, L., Farber, M. K., Carusi, D. A., Toledo, P., Bateman, B. T. 2024

  Abstract

  To evaluate the comparative efficacy of two of the most commonly used second-line uterotonics-methylergonovine maleate and carboprost tromethamine.We conducted a double-blind randomized trial at two large academic perinatal centers in patients undergoing nonemergency cesarean delivery with uterine atony refractory to oxytocin, as diagnosed by the operating obstetrician. The intervention included administration of a single dose of intramuscular methylergonovine or carboprost intraoperatively at diagnosis. The primary outcome, uterine tone on a 0-10 numeric rating scale 10 minutes after study drug administration, was rated by operating obstetricians blinded to the drug administered. Secondary outcomes included uterine tone score at 5 minutes, administration of additional uterotonic agents, other interventions for uterine atony or hemorrhage, quantitative blood loss, urine output, postpartum change in serum hematocrit, transfusion, length of hospital stay, adverse drug or transfusion reactions, and postpartum hemorrhage complications. A sample size of 50 participants per group was planned to detect a 1-point difference (with estimated within-group SD of 1.5) in the mean primary outcome with 80% power at a two-sided α level of 0.05 while accounting for potential protocol violations.A total of 1,040 participants were enrolled, with 100 randomized to receive one of the study interventions. Mean±SD 10-minute uterine tone scores were 7.3±1.7 after methylergonovine and 7.6±2.1 after carboprost, with an adjusted difference in means of -0.1 (95% CI, -0.8 to 0.6, P=.76). Additional second-line uterotonics were required in 30.0% of the methylergonovine arm and 34.0% in the carboprost arm (adjusted odds ratio 0.72, 95% CI, 0.27-1.89, P=.505), and geometric mean quantitative blood loss was 756 mL (95% CI, 636-898) and 708 mL (95% CI, 619-810) (adjusted ratio of geometric means 1.06, 95% CI, 0.86-1.31, P=.588), respectively. No differences were detected in the occurrence of other interventions for uterine atony or postpartum hemorrhage.No difference was detected in uterine tone scores 10 minutes after administration of either methylergonovine or carboprost for refractory uterine atony, indicating that either agent is acceptable.ClinicalTrials.gov, NCT03584854.

  View details for DOI 10.1097/AOG.0000000000005744

  View details for PubMedID 39326051

• Anesthetic recommendations for maternal and fetal safety in nonobstetric surgery: a balancing act. Current opinion in anaesthesiology Obiyo, L. T., Tobes, D., Cole, N. M. 2024; 37 (3): 285-291

  Abstract

  Nonobstetric surgery during pregnancy is associated with maternal and fetal risks. Several physiologic changes create unique challenges for anesthesiologists. This review highlights physiologic changes of pregnancy and presents clinical recommendations based on recent literature to guide anesthetic management for the pregnant patient undergoing nonobstetric surgery.Nearly every anesthetic technique has been safely used in pregnant patients. Although it is difficult to eliminate confounding factors, exposure to anesthetics could endanger fetal brain development. Perioperative fetal monitoring decisions require an obstetric consult based on anticipated maternal and fetal concerns. Given the limitations of fasting guidelines, bedside gastric ultrasound is useful in assessing aspiration risk in pregnant patients. Although there is concern about appropriateness of sugammadex for neuromuscular blockade reversal due its binding to progesterone, preliminary literature supports its safety.These recommendations will equip anesthesiologists to provide safe care for the pregnant patient and fetus undergoing nonobstetric surgery.

  View details for DOI 10.1097/ACO.0000000000001363

  View details for PubMedID 38390901

• A Case Report of Fluoroscopically Guided Epidural Catheter Placement in a Parturient with History of Tethered Cord, Super-Morbid Obesity, and Risk for Difficult Airway. A&A practice Thomas, C. L., Montes, M., Malik, T., Sandeep Ram, B., Smith, C. L., Scavone, B. M., Cole, N. M. 2024; 18 (4): e01777

  Abstract

  Tethered cord syndrome results from adherence of the conus medullaris to the sacrum and may be associated with high complication rates from neuraxial anesthesia. We present the case of a 32-year-old gravida 2 para 0 patient with a history of lipomyelomeningocele (one of several types of spina bifida) and tethered cord status post repair, residual low-lying conus medullaris, supermorbid obesity (body mass index of 58), and Mallampati IV airway, who underwent successful fluoroscopically guided epidural catheter placement for vaginal delivery. Risks and benefits of epidural catheter utilization and methods of placement are reviewed.

  View details for DOI 10.1213/XAA.0000000000001777

  View details for PubMedID 38587314

• A survey of pregnant patients' perspectives on the implementation of artificial intelligence in clinical care. Journal of the American Medical Informatics Association : JAMIA Armero, W., Gray, K. J., Fields, K. G., Cole, N. M., Bates, D. W., Kovacheva, V. P. 2022; 30 (1): 46-53

  Abstract

  To evaluate and understand pregnant patients' perspectives on the implementation of artificial intelligence (AI) in clinical care with a focus on opportunities to improve healthcare technologies and healthcare delivery.We developed an anonymous survey and enrolled patients presenting to the labor and delivery unit at a tertiary care center September 2019-June 2020. We investigated the role and interplay of patient demographic factors, healthcare literacy, understanding of AI, comfort levels with various AI scenarios, and preferences for AI use in clinical care.Of the 349 parturients, 57.6% were between the ages of 25-34 years, 90.1% reported college or graduate education and 69.2% believed the benefits of AI use in clinical care outweighed the risks. Cluster analysis revealed 2 distinct groups: patients more comfortable with clinical AI use (Pro-AI) and those who preferred physician presence (AI-Cautious). Pro-AI patients had a higher degree of education, were more knowledgeable about AI use in their daily lives and saw AI use as a significant advancement in medicine. AI-Cautious patients reported a lack of human qualities and low trust in the technology as detriments to AI use.Patient trust and the preservation of the human physician-patient relationship are critical in moving forward with AI implementation in healthcare. Pregnant individuals are cautiously optimistic about AI use in their care.Our findings provide insights into the status of AI use in perinatal care and provide a platform for driving patient-centered innovations.

  View details for DOI 10.1093/jamia/ocac200

  View details for PubMedID 36250788

  View details for PubMedCentralID PMC9748543

• The interrater reliability and agreement of a 0 to 10 uterine tone score in cesarean delivery. American journal of obstetrics & gynecology MFM Cole, N. M., Abushoshah, I., Fields, K. G., Carusi, D. A., Robinson, J. N., Bateman, B. T., Farber, M. K. 2021; 3 (3): 100342

  Abstract

  Postpartum hemorrhage is a leading source of maternal morbidity and mortality worldwide with uterine atony identified as the underlying cause in up to 80% of cases. Several measures have been utilized to report uterine tone. The most commonly reported measure is a 0 to 10 numeric rating scale, but this scale has not been tested for reliability or agreement between different raters.The primary purpose of this study was to evaluate the interrater reliability and agreement of the 0 to 10 visual numeric rating scale of uterine tone during cesarean delivery. A secondary purpose was to obtain estimates of scale responsiveness and minimal clinically important difference.Between August and November of 2018, obstetricians used a 0 to 10 numeric rating score to independently rate uterine tone at 3 and 10 minutes after cesarean delivery by palpation of the uterus. Of note, "0" represented "no tone" and "10" represented excellent tone. Each obstetrician independently and blinded to the other's score pointed to a numeric rating scale held by the anesthesiologist through a clear sterile drape. Intraclass correlation coefficients and Bland-Altman analysis were used to assess interrater reliability and agreement, respectively. Standardized response mean and standard error of measurement were used to obtain estimates of responsiveness and minimal clinically important difference, respectively.A total of 82 and 84 pairs of scores were collected at 3 and 10 minutes, respectively, from pairs of 62 unique obstetricians. The mean±standard deviation difference in scores between rater 1 and rater 2 was 0.4±1.4 at 3 minutes and 0.1±1.1 at 10 minutes. Intraclass correlation coefficients for a future single rater (intraclass correlation coefficient [1, 1]) at 3 and 10 minutes were 0.67 (95% confidence interval, 0.53-0.77) and 0.61 (95% confidence interval, 0.46-0.73), and for the average between 2 future raters (intraclass correlation coefficient [1, 2]), they were 0.80 (95% confidence interval, 0.71-0.87) and 0.76 (95% confidence interval, 0.63-0.84), indicating good and excellent reliability, respectively. Bland-Altman analysis estimated 95% limit of agreement between raters of -2.4 (95% confidence interval, -3.0 to -1.9) to 3.1 (95% confidence interval, 2.6-3.7) at 3 minutes and -2.1 (95% confidence interval, -2.5 to -1.7) to 2.4 (95% confidence interval, 2.0-2.8) at 10 minutes, consistent with good interrater agreement at both time points. The standardized response mean from 3 to 10 minutes after delivery was 1.1 (n=81). Standard error of measurement was 1.0 (95% confidence interval, 0.9-1.1) at 3 minutes and 0.8 (95% confidence interval, 0.7-0.9) at 10 minutes.The 0 to 10 numeric rating scale for uterine tone demonstrated good to excellent interrater reliability with 1 and 2 raters, respectively, and good interrater agreement. The scale was responsive to within-parturient change in tone, and preliminary estimates of the minimal clinically important difference were obtained. The 0 to 10 numeric rating scale for uterine tone may be a reliable, standardized tool for future research in reporting degree of uterotonic contraction during cesarean delivery.

  View details for DOI 10.1016/j.ajogmf.2021.100342

  View details for PubMedID 33652161

• Labor prior to cesarean delivery associated with higher post-discharge opioid consumption. PloS one Ende, H. B., Landau, R., Cole, N. M., Burns, S. M., Bateman, B. T., Bauer, M. E., Booth, J. L., Flood, P., Leffert, L. R., Houle, T. T., Tsen, L. C. 2021; 16 (7): e0253990

  Abstract

  BACKGROUND: Severe acute post-cesarean delivery (CD) pain has been associated with an increased risk for persistent pain and postpartum depression. Identification of women at increased risk for pain can be used to optimize post-cesarean analgesia. The impact of labor prior to CD (intrapartum CD) on acute post-operative pain and opioid use is unclear. We hypothesized that intrapartum CD, which has been associated with both increased inflammation and affective distress related to an unexpected surgical procedure, would result in higher postoperative pain scores and increased opioid intake.METHODS: This is a secondary analysis of a prospective cohort study examining opioid use up to 2 weeks following CD. Women undergoing CD at six academic medical centers in the United States 9/2014-3/2016 were contacted by phone two weeks following discharge. Participants completed a structured interview that included questions about postoperative pain scores and opioid utilization. They were asked to retrospectively estimate their maximal pain score on an 11-point numeric rating scale at multiple time points, including day of surgery, during hospitalization, immediately after discharge, 1st week, and 2nd week following discharge. Pain scores over time were assessed utilizing a generalized linear mixed-effects model with the patient identifier being a random effect, adjusting for an a priori defined set of confounders. A multivariate negative binomial model was utilized to assess the association between intrapartum CD and opioid utilization after discharge, also adjusting for the same confounders. In the context of non-random prescription distribution, this model was constructed with an offset for the number of tablets dispensed.RESULTS: A total of 720 women were enrolled, 392 with and 328 without labor prior to CD. Patients with intrapartum CD were younger, less likely to undergo repeat CD or additional surgical procedures, and more likely to experience a complication of CD. Women with intrapartum CD consumed more opioid tablets following discharge than women without labor (median 20, IQR 10-30 versus 17, IQR 6-30; p = 0.005). This association persisted after adjustment for confounders (incidence rate ratio 1.16, 95% CI 1.05-1.29; p = 0.004). Pain scores on the day of surgery were higher in women with intrapartum CD (difference 0.91, 95% CI 0.52-1.30; adj. p = <0.001) even after adjustment for confounders. Pain scores at other time points were not meaningfully different between the two groups.CONCLUSION: Intrapartum CD is associated with worse pain on the day of surgery but not other time points. Opioid requirements following discharge were modestly increased following intrapartum CD.

  View details for DOI 10.1371/journal.pone.0253990

  View details for PubMedID 34242277

• Transversus Abdominis Plane Block With Liposomal Bupivacaine for Pain After Cesarean Delivery in a Multicenter, Randomized, Double-Blind, Controlled Trial. Anesthesia and analgesia Nedeljkovic, S. S., Kett, A., Vallejo, M. C., Horn, J., Carvalho, B., Bao, X., Cole, N. M., Renfro, L., Gadsden, J. C., Song, J., Yang, J., Habib, A. S. 2020

  Abstract

  BACKGROUND: In women undergoing cesarean delivery under spinal anesthesia with intrathecal morphine, transversus abdominis plane (TAP) block with bupivacaine hydrochloride (HCl) may not improve postsurgical analgesia. This lack of benefit could be related to the short duration of action of bupivacaine HCl. A retrospective study reported that TAP block with long-acting liposomal bupivacaine (LB) reduced opioid consumption and improved analgesia following cesarean delivery. Therefore, we performed a prospective multicenter, randomized, double-blind trial examining efficacy and safety of TAP block with LB plus bupivacaine HCl versus bupivacaine HCl alone.METHODS: Women (n = 186) with term pregnancies undergoing elective cesarean delivery under spinal anesthesia were randomized (1:1) to TAP block with LB 266 mg plus bupivacaine HCl 50 mg or bupivacaine HCl 50 mg alone. Efficacy was evaluated in a protocol-compliant analysis (PCA) set that was defined a priori. The primary end point was total postsurgical opioid consumption (oral morphine equivalent dosing [MED]) through 72 hours. Pain intensity was measured using a visual analog scale. Adverse events (AEs) after treatment were recorded through day 14.RESULTS: Total opioid consumption through 72 hours was reduced with LB plus bupivacaine HCl versus bupivacaine HCl alone (least squares mean [LSM] [standard error (SE)] MED, 15.5 mg [6.67 mg] vs 32.0 mg [6.25 mg]). This corresponded to an LSM treatment difference of -16.5 mg (95% confidence interval [CI], -30.8 to -2.2 mg; P = .012). The area under the curve of imputed pain intensity scores through 72 hours supported noninferiority of LB plus bupivacaine HCl versus bupivacaine HCl alone (LSM [SE], 147.9 [21.13] vs 178.5 [19.78]; LSM treatment difference, -30.6; 95% CI, -75.9 to 14.7), with a prespecified noninferiority margin of 36 (P = .002). In an analysis of all treated patients, including those not meeting criteria for inclusion in the PCA, there was no difference in postsurgical opioid consumption between groups. In the LB plus bupivacaine HCl group, 63.6% of patients experienced an AE after treatment versus 56.2% in the bupivacaine HCl-alone group. Serious AEs after treatment were rare (3% in both groups).CONCLUSIONS: TAP block using LB plus bupivacaine HCl as part of a multimodal analgesia protocol incorporating intrathecal morphine resulted in reduced opioid consumption after cesarean delivery in the PCA set. Results suggest that with correct TAP block placement and adherence to a multimodal postsurgical analgesic regimen, there is an opioid-reducing benefit of adding LB to bupivacaine TAP blocks after cesarean delivery (ClinicalTrials.gov identifier: NCT03176459).

  View details for DOI 10.1213/ANE.0000000000005075

  View details for PubMedID 32739962

• Evaluation of a Quality Improvement Intervention That Eliminated Routine Use of Opioids After Cesarean Delivery. Obstetrics and gynecology Holland, E., Bateman, B. T., Cole, N., Taggart, A., Robinson, L. A., Sugrue, R., Xu, X., Robinson, J. N. 2019; 133 (1): 91-97

  Abstract

  To evaluate the effects of eliminating the routine use of oral opioids for postcesarean delivery analgesia on postcesarean opioid consumption.At a tertiary care center, we implemented a quality improvement intervention among faculty practice patients undergoing cesarean delivery, which consisted of 1) eliminating routine ordering of oral opioids after cesarean delivery, 2) implementing guidelines for ordering a short course of opioids when deemed necessary, and 3) coupling opioid prescribing at discharge to patterns of opioid use in-hospital combined with shared decision-making. All patients, both before and after the intervention, were administered neuraxial opioids and scheduled acetaminophen and nonsteroidal antiinflammatory medications in the absence of contraindications. The primary outcome was the percentage of women who used any opioids postoperatively in-hospital. Secondary outcomes included the percentage of women discharged with a prescription for opioids, the quantity of opioids used in-hospital, pain scores, satisfaction, opioid-related side effects, and opioid prescriptions ordered in the 6 weeks after delivery. The effects of this intervention were assessed based on a chart review of patient data and a survey of patients in the 12 weeks before and 12 weeks after the intervention.We evaluated the records of 191 postcesarean delivery patients before and 181 after the intervention. Less than half of women used oral opioids in-hospital after the intervention, 82 (45%) compared with 130 (68%) before (P<.001). However, there was no change in pain scores or overall satisfaction with pain relief. Postintervention, only 40% of patients were discharged with prescriptions for opioids compared with 91% of patients before the intervention (P<.001).Eliminating routine ordering of oral opioids after cesarean delivery is associated with a significant decrease in opioid consumption while maintaining the same levels of pain control and patient satisfaction. Oral opioids are not needed by a large proportion of women after cesarean delivery.

  View details for DOI 10.1097/AOG.0000000000003010

  View details for PubMedID 30531571

• Challenges and hurdles for patient safety in obstetric anesthesia in Japan. Journal of anesthesia Fujita, N., Cole, N. M., Nagasaka, Y. 2018; 32 (6): 901-907

  Abstract

  The use of pain relief for labor has gained popularity in Japan. However, its acceptance is still low among laboring women: only 6.1% of Japanese parturients receive labor analgesia, in contrast with the United States, where approximately 70% receive labor analgesia. Unfortunately, several maternal deaths associated with labor analgesia have been reported in recent years in Japan and how to achieve safer obstetric care is a pressing concern. In this review, we focus on current approaches to labor analgesia in the United States as they compare to existing practices in Japan. We discuss challenges for the introduction and implementation of standard anesthesia practice into the Labor and Delivery Room (LDR; i.e., labor and delivery ward), aiming to secure safety for both mothers and fetus in every part of Japan in the near future.

  View details for DOI 10.1007/s00540-018-2571-z

  View details for PubMedID 30377804

• Regional Anesthesia for Arteriovenous Fistula Surgery May Reduce Hospital Length of Stay and Reoperation Rates. Vascular and endovascular surgery Cole, N. M., Vlassakov, K., Brovman, E. Y., Heydarpour, M., Urman, R. D. 2018; 52 (6): 418-426

  Abstract

  Regional anesthesia has been proposed as the preferred mode of anesthesia for arteriovenous fistula surgery due to its associated vasodilatory effects and fistula patency rates. We analyzed patient outcomes after arteriovenous fistula surgery for their association with the type of anesthesia received.The National Surgical Quality Improvement Project database was accessed to identify a cohort of 3199 patients undergoing arteriovenous fistula surgery from 2007 to 2015. Multiple regression models were used to examine the association of anesthesia with 12 postoperative outcomes. Additional multivariate logistic regression was performed to assess significant independent variables predictive of anesthesia choice.Patients who received regional anesthesia had the shortest postoperative length of stay (0.67 [standard deviation: 2.0] days) compared to monitored anesthesia care/intravenous (IV) sedation (0.77 [1.8] days) and general anesthesia (1.44 [2.8] days). Administration of regional anesthesia was associated with a shorter length of stay compared to general anesthesia (odds ratio [OR]: 0.55, P = .001). Patients who received monitored anesthesia care/IV sedation had a lower risk of reoperation compared to general anesthesia (OR: 0.65, P = .012) but not compared to regional anesthesia (OR: 0.89, P = .759). Anesthesia type had no significant effects on other measured postoperative complications. Predictors of the type of anesthesia were age and surgical procedure as defined by Current Procedural Terminology code ( P < .001).Use of regional anesthesia is associated with a shorter postoperative length of stay after arteriovenous fistula surgery and lower risk of reoperation compared to general anesthesia or monitored anesthesia care/IV sedation. Regional anesthesia may be an excellent choice for arteriovenous fistula surgery to reduce postoperative length of stay and risk of reoperation.

  View details for DOI 10.1177/1538574418772451

  View details for PubMedID 29706126

• Patterns of Opioid Prescription and Use After Cesarean Delivery. Obstetrics and gynecology Bateman, B. T., Cole, N. M., Maeda, A. n., Burns, S. M., Houle, T. T., Huybrechts, K. F., Clancy, C. R., Hopp, S. B., Ecker, J. L., Ende, H. n., Grewe, K. n., Raposo Corradini, B. n., Schoenfeld, R. E., Sankar, K. n., Day, L. J., Harris, L. n., Booth, J. L., Flood, P. n., Bauer, M. E., Tsen, L. C., Landau, R. n., Leffert, L. R. 2017; 130 (1): 29–35

  Abstract

  To define the amount of opioid analgesics prescribed and consumed after discharge after cesarean delivery.We conducted a survey at six academic medical centers in the United States from September 2014 to March 2016. Women who had undergone a cesarean delivery were contacted by phone 2 weeks after discharge and participated in a structured interview about the opioid prescription they received on discharge and their oral opioid intake while at home.A total of 720 women were enrolled; of these, 615 (85.4%) filled an opioid prescription. The median number of dispensed opioid tablets was 40 (interquartile range 30-40), the median number consumed was 20 (interquartile range 8-30), and leftover was 15 (interquartile range 3-26). Of those with leftover opioids, 95.3% had not disposed of the excess medication at the time of the interview. There was an association between a larger number of tablets dispensed and the number consumed independent of patient characteristics. The amount of opioids dispensed did not correlate with patient satisfaction, pain control, or the need to refill the opioid prescription.The amount of opioid prescribed after cesarean delivery generally exceeds the amount consumed by a significant margin, leading to substantial amounts of leftover opioid medication. Lower opioid prescription correlates with lower consumption without a concomitant increase in pain scores or satisfaction.

  View details for PubMedID 28594763

  View details for PubMedCentralID PMC5600205

• In Vitro Comparative Effect of Carbetocin and Oxytocin in Pregnant Human Myometrium with and without Oxytocin Pretreatment. Anesthesiology Cole, N. M., Carvalho, J. C., Erik-Soussi, M., Ramachandran, N., Balki, M. 2016; 124 (2): 378-86

  Abstract

  The purpose of this study was to compare in vitro contractile effects of oxytocin and carbetocin on human term pregnant myometrium with and without oxytocin pretreatment.This laboratory investigation was conducted on myometrial samples from women undergoing elective cesarean deliveries. The samples were dissected into four strips and suspended in individual organ bath chambers containing physiologic salt solution. After equilibration, they were pretreated with oxytocin 10 M (experimental group) or physiologic salt solution (control group) for 2 h and then subjected to dose-response testing with increasing concentrations of oxytocin or carbetocin (10 to 10 M). The amplitude, frequency, motility index (amplitude × frequency), and area under the curve of contractions were recorded and analyzed during the equilibration and dose-response periods. Comparisons were made between oxytocin-induced and carbetocin-induced contractions in control and oxytocin-pretreated groups. Motility index was the primary outcome measure.Sixty-three experiments were performed (carbetocin, n = 31; oxytocin, n = 32) on samples from 18 women. The motility index of contractions (√g.contractions/10 min) produced by oxytocin was significantly higher than carbetocin in both control (regression-estimated difference, 0.857; 95% CI, 0.290 to 1.425; P = 0.003) and oxytocin-pretreated (0.813; 0.328 to 1.299; P = 0.001) groups. The motility index was significantly lower in oxytocin-pretreated groups than their respective controls for both oxytocin (-1.040; -1.998 to -0.082; P = 0.03) and carbetocin (-0.996; -1.392 to -0.560; P < 0.001).In vitro contractions produced by oxytocin are superior to carbetocin in human myometrium with or without oxytocin pretreatment. Oxytocin pretreatment results in attenuation of contractions induced by both oxytocin and carbetocin.

  View details for DOI 10.1097/ALN.0000000000000940

  View details for PubMedID 26569172

• Controlling pain after total hip and knee arthroplasty using a multimodal protocol with local periarticular injections: a prospective randomized study. The Journal of arthroplasty Parvataneni, H. K., Shah, V. P., Howard, H., Cole, N., Ranawat, A. S., Ranawat, C. S. 2007; 22 (6 Suppl 2): 33-8

  Abstract

  In this prospective randomized study, patients undergoing total hip (THA) or knee arthroplasty (TKA) were randomized to either a study group receiving periarticular injections or a control group receiving patient-controlled analgesia with or without femoral nerve block (TKA patients). All patients received a comprehensive multimodal perioperative protocol. Pain, recovery of functional milestones, and overall satisfaction were assessed. The THA study group demonstrated significantly lower average pain scores and higher overall satisfaction than the control group. There was no significant difference in pain scores between the study and control groups in the TKA cohort. Both study groups demonstrated lower narcotic usage and side effects as well as improved early functional recovery. Periarticular injection with a multimodal protocol was shown to safely provide excellent pain control and functional recovery and can be substituted for conventional pain control modalities.

  View details for DOI 10.1016/j.arth.2007.03.034

  View details for PubMedID 17823012