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  1. Chew ST, Mar WM, Ti LK
    Br J Anaesth, 2013 Mar;110(3):397-401.
    PMID: 23171723 DOI: 10.1093/bja/aes415
    BACKGROUND: Postoperative acute kidney injury (AKI) is a frequent and serious complication after cardiac surgery. Clinical factors alone have failed to accurately predict the incidence of AKI after cardiac surgery. Ethnicity has been shown to be a predictor of AKI in the Western population. We tested the hypothesis that ethnicity is an independent predictor of AKI in patients undergoing cardiac surgery in a South East Asian population.

    METHODS: A total of 1756 consecutive patients undergoing cardiac surgery were prospectively recruited. Among them, data of 1639 patients met the criteria for analysis. There were 1182 Chinese, 195 Indian, and 262 Malay patients. The main outcome was postoperative AKI, defined as a 25% or greater increase in preoperative to a maximum postoperative serum creatinine level within 3 days after surgery.

    RESULTS: Five hundred and seventy-nine patients (35.3%) developed AKI after cardiac surgery. Ethnicity was shown to be an independent predictor of AKI after cardiac surgery with Indians and Malays having a higher risk of developing AKI when compared with Chinese patients (odds ratio: Indian vs Chinese 1.44, Malay vs Chinese 1.51).

    CONCLUSIONS: Indians and Malays have a higher risk of developing AKI after cardiac surgery than Chinese in a South East Asian population. Ethnicity was shown to be an independent predictor of AKI after cardiac surgery.

  2. Ang E, Ng KT, Lee ZX, Ti LK, Chaw SH, Wang CY
    J Clin Anesth, 2020 Dec;67:110023.
    PMID: 32805685 DOI: 10.1016/j.jclinane.2020.110023
    OBJECTIVES: There is growing evidence on the influence of general anaesthesia (GA) in promoting the proliferation of cancer cells. The benefits of regional anaesthesia (RA) on cancer recurrence rate in cancer surgery remains unclear in the literature. The primary objective of this review was to examine the effect of RA on the incidence of post-operative cancer recurrence rate in cancer resection surgery.

    DESIGN: Systematic review and meta-analysis with trial sequential analysis.

    DATA SOURCES: Medline, EMBASE and CENTRAL were systematically searched from its inception until April 2020.

    ELIGIBILITY CRITERIA: All randomized control trials and observational studies comparing RA only versus GA in cancer resection surgery were included. Case report, case series and editorials were excluded.

    RESULTS: Ten retrospective observational studies (n = 9708; 4567 GA vs 5141 RA) were included for qualitative and quantitative meta-analysis. In comparison to GA, RA was not significantly associated with a lower cancer recurrence rate in cancer resection surgery (odds ratio 1.01, 95% CI 0.67 to 1.53, p = 0.95, certainty of evidence = very low). However, the trial sequential analysis for cancer recurrence rate was inconclusive. Our analysis demonstrated no significant difference between the RA and GA groups in the overall survival rate (odds ratio 1.51, 95% CI 0.65 to 3.51, p = 0.34, certainty of evidence = very low), time to cancer recurrence (mean difference 1.45 months, 95% CI -8.69 to 11.59, p = 0.78, certainty of evidence = very low), cancer-related mortality (odds ratio 1.79, 95% CI 0.57 to 5.62, p = 0.32, certainty of evidence = very low).

    CONCLUSIONS: Given the low level of evidence and underpowered trial sequential analysis, our review neither support nor oppose that the use of RA was associated with lower incidence of cancer recurrence rate than GA in cancer resection surgery.

    TRIAL REGISTRATION: CRD42020163780.

  3. Phoon PHY, MacLaren G, Ti LK, Tan JSK, Hwang NC
    J Cardiothorac Vasc Anesth, 2019 Dec;33(12):3394-3401.
    PMID: 30131218 DOI: 10.1053/j.jvca.2018.07.018
    Singapore is a small Southeast Asian island city-state located at the tip of the Malay peninsula with a population of 5.61 million people. It was a former British colony that went on to become a part of Malaysia before gaining independence in 1965. Since then, Singapore has developed tremendously from a small fishing village into the region's medical hub. This article will explore the roots of cardiac anesthesia in Singapore and how it has developed into a subspecialty today.
  4. Moorthy V, Liu W, Chan SP, Chew STH, Ti LK
    J Diabetes, 2020 Jan;12(1):58-65.
    PMID: 31210000 DOI: 10.1111/1753-0407.12961
    BACKGROUND: Although diabetes is associated with ethnicity and worse cardiac surgery outcomes, no research has been done to study the effect of both diabetes and ethnicity on cardiac surgery outcomes in a multiethnic Southeast Asian cohort. Hence, this study aimed to delineate the association of ethnicity on outcomes after cardiac surgery among diabetics in a multiethnic Southeast Asian population.

    METHODS: Perioperative data from 3008 adult patients undergoing elective cardiac surgery from 2008 to 2011 at the two main heart centers in Singapore was analyzed prospectively, and confirmatory analysis was conducted with the generalized structural equation model.

    RESULTS: Diabetes was significantly associated with postoperative acute kidney injury (AKI) and postoperative hyperglycemia. Postoperative AKI, Malay ethnicity, and blood transfusion were associated with postoperative dialysis. Postoperative AKI and blood transfusion were also associated with postoperative arrhythmias. In turn, postoperative dialysis and arrhythmias increased the odds of 30-day mortality by 7.7- and 18-fold, respectively.

    CONCLUSIONS: This study identified that diabetes is directly associated with postoperative hyperglycemia and AKI, and indirectly associated with arrhythmias and 30-day mortality. Further, we showed that ethnicity not only affects the prevalence of diabetes, but also postoperative diabetes-related outcomes.

  5. Chew WZ, Teoh WY, Sivanesan N, Loh PS, Shariffuddin II, Ti LK, et al.
    J Cardiothorac Vasc Anesth, 2022 Dec;36(12):4449-4459.
    PMID: 36038444 DOI: 10.1053/j.jvca.2022.07.004
    OBJECTIVE: To examine the effect of bispectral index (BIS)-guided anesthesia on the incidence of postoperative delirium (POD) in elderly patients undergoing surgery.

    DESIGN: A systematic review, meta-analysis, and trial sequential analysis (TSA).

    SETTING: In the operating room, postoperative anesthesia care units (PACU), and ward.

    PARTICIPANTS: Elderly patients (>60 years old) undergoing surgery.

    INTERVENTIONS: The EMBASE, MEDLINE, and CENTRAL databases were searched systematically from their inception until December 2020 for randomized controlled trials comparing BIS and usual care or blinded BIS.

    MEASUREMENTS AND MAIN RESULTS: Ten trials (N = 3,891) were included for quantitative meta-analysis. In comparison to the control group, there was no significant difference in the incidence of POD in elderly patients randomized to BIS-guided anesthesia (odds ratio [OR] 0.71, 95% CI 0.47-1.08, I2 = 76%, p = 0.11, level of evidence = very low, TSA = inconclusive). The authors' review demonstrated that elderly patients with BIS-guided anesthesia were significantly associated with a lower incidence of postoperative cognitive dysfunction (POCD) (OR 0.64, 95% CI 0.46-0.88, p = 0.006), extubation time (mean difference [MD] -3.38 minutes, 95% CI -4.38 to -2.39, p < 0.00001), time to eye opening (MD -2.17 minutes, 95% CI -4.21 to -0.14, p = 0.04), and time to discharge from the PACU (MD -10.77 minutes, 95% CI -11.31 to - 10.23, p < 0.00001).

    CONCLUSION: The authors' meta-analysis demonstrated that BIS-guided anesthesia was not associated with a reduced incidence of POD, but it was associated with a reduced incidence of POCD and improved recovery parameters.

  6. Ng KT, Lim WE, Teoh WY, Shariffuddin II, Ti LK, Abidin MFBZ
    J Anesth, 2024 Feb;38(1):65-76.
    PMID: 38019351 DOI: 10.1007/s00540-023-03281-6
    PURPOSE: Midline approach of spinal anesthesia has been widely used for patients undergoing surgical procedures. However, it might not be effective for obstetric patients and elderly with degenerative spine changes. Primary objective was to examine the success rate at the first attempt between the paramedian and midline spinal anesthesia in adults undergoing surgery.

    METHODS: Databases of MEDLINE, EMBASE, and CENTRAL were searched from their starting date until February 2023. Randomized clinical trials (RCTs) comparing the paramedian versus midline approach of spinal anesthesia were included. The primary outcome was the success rate at the first attempt of spinal anesthesia.

    RESULTS: Our review included 36 RCTs (n = 5379). Compared to the midline approach, paramedian approach may increase success rate at the first attempt but the evidence is very uncertain (OR: 0.47, 95% CI 0.27-0.82, ρ = 0.007, level of evidence:very low). Our pooled data indicates that the paramedian approach likely reduced incidence of post-spinal headache (OR: 2.07, 95% CI 1.51-2.84, ρ 

  7. Koh W, Chakravarthy M, Simon E, Rasiah R, Charuluxananan S, Kim TY, et al.
    BMC Anesthesiol, 2021 08 16;21(1):205.
    PMID: 34399681 DOI: 10.1186/s12871-021-01414-6
    BACKGROUND: Anesthesia leads to impairments in central and peripheral thermoregulatory responses. Inadvertent perioperative hypothermia is hence a common perioperative complication, and is associated with coagulopathy, increased surgical site infection, delayed drug metabolism, prolonged recovery, and shivering. However, surveys across the world have shown poor compliance to perioperative temperature management guidelines. Therefore, we evaluated the prevalent practices and attitudes to perioperative temperature management in the Asia-Pacific region, and determined the individual and institutional factors that lead to noncompliance.

    METHODS: A 40-question anonymous online questionnaire was distributed to anesthesiologists and anesthesia trainees in six countries in the Asia-Pacific (Singapore, Malaysia, Philippines, Thailand, India and South Korea). Participants were polled about their current practices in patient warming and temperature measurement across the preoperative, intraoperative and postoperative periods. Questions were also asked regarding various individual and environmental barriers to compliance.

    RESULTS: In total, 1154 valid survey responses were obtained and analyzed. 279 (24.2%) of respondents prewarm, 508 (44.0%) perform intraoperative active warming, and 486 (42.1%) perform postoperative active warming in the majority of patients. Additionally, 531 (46.0%) measure temperature preoperatively, 767 (67.5%) measure temperature intraoperatively during general anesthesia, and 953 (82.6%) measure temperature postoperatively in the majority of patients. The availability of active warming devices in the operating room (p 

  8. Shehabi Y, Bellomo R, Kadiman S, Ti LK, Howe B, Reade MC, et al.
    Crit Care Med, 2018 06;46(6):850-859.
    PMID: 29498938 DOI: 10.1097/CCM.0000000000003071
    OBJECTIVES: In the absence of a universal definition of light or deep sedation, the level of sedation that conveys favorable outcomes is unknown. We quantified the relationship between escalating intensity of sedation in the first 48 hours of mechanical ventilation and 180-day survival, time to extubation, and delirium.

    DESIGN: Harmonized data from prospective multicenter international longitudinal cohort studies SETTING:: Diverse mix of ICUs.

    PATIENTS: Critically ill patients expected to be ventilated for longer than 24 hours.

    INTERVENTIONS: Richmond Agitation Sedation Scale and pain were assessed every 4 hours. Delirium and mobilization were assessed daily using the Confusion Assessment Method of ICU and a standardized mobility assessment, respectively.

    MEASUREMENTS AND MAIN RESULTS: Sedation intensity was assessed using a Sedation Index, calculated as the sum of negative Richmond Agitation Sedation Scale measurements divided by the total number of assessments. We used multivariable Cox proportional hazard models to adjust for relevant covariates. We performed subgroup and sensitivity analysis accounting for immortal time bias using the same variables within 120 and 168 hours. The main outcome was 180-day survival. We assessed 703 patients in 42 ICUs with a mean (SD) Acute Physiology and Chronic Health Evaluation II score of 22.2 (8.5) with 180-day mortality of 32.3% (227). The median (interquartile range) ventilation time was 4.54 days (2.47-8.43 d). Delirium occurred in 273 (38.8%) of patients. Sedation intensity, in an escalating dose-dependent relationship, independently predicted increased risk of death (hazard ratio [95% CI], 1.29 [1.15-1.46]; p < 0.001, delirium hazard ratio [95% CI], 1.25 [1.10-1.43]), p value equals to 0.001 and reduced chance of early extubation hazard ratio (95% CI) 0.80 (0.73-0.87), p value of less than 0.001. Agitation level independently predicted subsequent delirium hazard ratio [95% CI], of 1.25 (1.04-1.49), p value equals to 0.02. Delirium or mobilization episodes within 168 hours, adjusted for sedation intensity, were not associated with survival.

    CONCLUSIONS: Sedation intensity independently, in an ascending relationship, predicted increased risk of death, delirium, and delayed time to extubation. These observations suggest that keeping sedation level equivalent to a Richmond Agitation Sedation Scale 0 is a clinically desirable goal.

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