Displaying publications 1 - 20 of 57 in total

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  1. Chew KS
    Med J Malaysia, 2023 Nov;78(6):845-846.
    PMID: 38031229
    Clinical toxinology is an essential subject that should be included in undergraduate medical curricula. By equipping students with the knowledge and skills to identify and treat venomous animals and use antivenom appropriately reduces the risk of medical negligence and delays in treating and transporting these patients. Unfortunately, given the packed curriculum of undergraduate medical programs, it is important to focus on providing students with essential knowledge and skills to function as competent house officers. Student-centered learning approaches, such as gamification and community service projects, can be effective in enhancing learning and promoting awareness of appropriate toxin-related public measures.
  2. Chew KS, Low MY
    Med J Malaysia, 2022 Jan;77(1):60-70.
    PMID: 35086996
    BACKGROUND: A scoping review was conducted to map out the common research focusses on ambulance accidents, their key findings and some of the major knowledge gaps in this area.

    MATERIALS AND METHODS: Relevant, peer-reviewed, Englishlanguage articles on land ambulance accidents were independently searched by the authors using the MEDLINE and CINAHL databases. Anecdotal reports, testimonies and stories in trade or popular magazines and other grey literature were excluded. Articles that do not directly address ambulance accidents were also excluded. Additional articles were identified from the reference lists of the selected articles and from Google search engine.

    RESULTS: From an initial yield of 879 articles, 19 articles were included. Most of these articles were published from 2001 - 2005 (5 articles, 26.3%) and 2006 - 2010 (5 articles, 26.3%). Eighteen articles (78.3%) are original articles (18 articles, 78.3%) and another one article is a review article. Most of these articles focused on (1) the types of collisions and (2) the risk factors of ambulance accidents. Nine risk factors were identified to have contributed to ambulance accidents: (1) driving in urban areas (2) driving on dry road (3) the use of lights & sirens (4) the failure to use restraints (5) driving for emergency use (6) back seating (7) at road intersection (8) driver's previous records of accidents and (9) interfacility transfer. The two most common risk factors studied were (1) the use of lights & sirens and (2) driving at intersection.

    CONCLUSIONS: Most of the above risk factors can be mapped into three categories of risk factors: task-related factors, vehicle-related factors and environment-related factors. The category of risk factors least studied is the category of driver-related factors.

  3. Chew KS, Ghani ZA
    Singapore Med J, 2014 Aug;55(8):439-42.
    PMID: 25189307
    INTRODUCTION: Family presence (FP) during resuscitation is an increasingly favoured trend, as it affords many benefits to the critically ill patient's family members. However, a previously conducted study showed that only 15.8% of surveyed Malaysian healthcare staff supported FP during resuscitation.

    METHODS: This cross-sectional study used a bilingual self-administered questionnaire to examine the attitudes and perceptions of the general Malaysian public toward the presence of family members during resuscitation of their loved ones. The questionnaires were randomly distributed to Malaysians in three different states and in the federal territory of Kuala Lumpur.

    RESULTS: Out of a total of 190 survey forms distributed, 184 responses were included for analysis. Of the 184 respondents, 140 (76.1%) indicated that they favoured FP during resuscitation. The most common reason cited was that FP during resuscitation provides family members with the assurance that everything possible had been done for their loved ones (n = 157, 85.3%). Respondents who had terminal illnesses were more likely to favour FP during resuscitation than those who did not, and this was statistically significant (95.0% vs. 73.8%; p = 0.04).

    CONCLUSION: FP during resuscitation was favoured by a higher percentage of the general Malaysian public as compared to Malaysian healthcare staff. This could be due to differences in concerns regarding the resuscitation process between members of the public and healthcare staff.
  4. Chew KS, Shaharudin AH
    Singapore Med J, 2017 Oct;58(10):601-605.
    PMID: 27193080 DOI: 10.11622/smedj.2016096
    INTRODUCTION: The use of intranasal fentanyl as an alternative type of analgesia has been shown to be effective in paediatric populations and prehospital settings. There are a limited number of studies on the use of intranasal fentanyl in adult patients in emergency settings.

    METHODS: An open-label study was conducted to evaluate the effectiveness of the addition of 1.5 mcg/kg intranasal fentanyl to 2 mg/kg intravenous tramadol (fentanyl + tramadol arm, n = 10) as compared to the administration of 2 mg/kg intravenous tramadol alone (tramadol-only arm, n = 10) in adult patients with moderate to severe pain due to acute musculoskeletal injuries.

    RESULTS: When analysed using the independent t-test, the difference between the mean visual analogue scale scores pre-intervention and ten minutes post-intervention was 29.8 ± 8.4 mm in the fentanyl + tramadol arm and 19.6 ± 9.7 mm in the tramadol-only arm (t[18] = 2.515, p = 0.022, 95% confidence interval 1.68-18.72 mm). A statistically significant, albeit transient, reduction in the ten-minute post-intervention mean arterial pressure was noted in the fentanyl + tramadol arm as compared to the tramadol-only arm (13.35 mmHg vs. 7.65 mmHg; using Mann-Whitney U test with U-value 21.5, p = 0.029, r = 0.48). There was a higher incidence of transient dizziness ten minutes after intervention among the patients in the fentanyl + tramadol arm.

    CONCLUSION: Although effective, intranasal fentanyl may not be appropriate for routine use in adult patients, as it could result in a significant reduction in blood pressure.

  5. Chew KS, Yazid MN
    Int J Emerg Med, 2008 Dec;1(4):301-9.
    PMID: 19384646 DOI: 10.1007/s12245-008-0070-y
    BACKGROUND: Despite the importance of early effective chest compressions to improve the chance of survival of an out-of-hospital cardiac arrest victim, it is still largely unknown how willing our Malaysian population is to perform bystander cardiopulmonary resuscitation (CPR).

    AIMS: We conducted a voluntary, anonymous self-administered questionnaire survey of a group of 164 final year medical students and 60 final year dental students to unravel their attitudes towards performing bystander CPR.

    METHODS: Using a 4-point Likert scale of "definitely yes," "probably yes," "probably no," and "definitely no," the students were asked to rate their willingness to perform bystander CPR under three categories: chest compressions with mouth-to-mouth ventilation (CC + MMV), chest compressions with mask-to-mouth ventilation (CC + PMV), and chest compressions only (CC). Under each category, the students were given ten hypothetical victim scenarios. Categorical data analysis was done using the McNemar test, chi-square test, and Fisher exact test where appropriate. For selected analysis, "definitely yes" and "probably yes" were recoded as a "positive response."

    RESULTS: Generally, we found that only 51.4% of the medical and 45.5% of the dental students are willing to perform bystander CPR. When analyzed under different hypothetical scenarios, we found that, except for the scenario where the victim is their own family member, all other scenarios showed a dismally low rate of positive responses in the category of CC + MMV, but their willingness was significantly improved under the CC + PMV and CC categories.

    CONCLUSION: This study shows that there are unique sociocultural factors that contribute to the reluctance of our students to perform CC + MMV.

  6. Chew KS, Amin NM
    Med J Malaysia, 2009 Jun;64(2):170-1.
    PMID: 20058582 MyJurnal
    Timely identification of specific injuries in a polytrauma case is of paramount importance in order to reduce morbidity and mortality. Unfortunately, some of these injuries are subtle and can be missed on initial primary and secondary assessments. In this paper, we report one such injury in a case of a 16-year old motorcyclist who complained of abdominal pain over the right lumbar region after the motorcycle handlebar hit his abdomen. Although initial assessment was uneventful, he was subsequently diagnosed to have a traumatic abdominal wall herniation on abdominal computed tomography after more than 24 hours of observation in the ward.
  7. Chew KS, Noredelina MN, Ida ZZ
    Med J Malaysia, 2015 Jun;70(3):162-8.
    PMID: 26248779 MyJurnal
    INTRODUCTION: Aimed at providing integrated multi-level crisis intervention to women experiencing violence such as rape, One Stop Crisis Centre (OSCC) in Malaysia is often located in the emergency department. Hence, it is imperative that emergency department healthcare providers possess adequate knowledge and acceptable attitudes and practices to ensure the smooth running of an efficient OSCC work process.

    METHOD: To study the knowledge, attitude and practice of rape management in OSCC among four groups of healthcare providers in the emergency department [i.e., the emergency medicine doctors (EDs), the staff nurses (SNs), the medical assistants (MAs) and the hospital attendants (HAs)], a selfadministered questionnaire in the form of Likert scale was conducted from January to October 2013. Correct or favourable responses were scored appropriately.

    RESULTS: Out of the 159 participants invited, 110 responded (69.2% response rate). As all data sets in the Knowledge, Attitude and Practice sections are non-parametric, Kruskal- Wallis test was performed. Homogeneity of variance was verified using non-parametric Levene test. In all three sections, there are statistically significant differences in scores obtained among the four groups of healthcare providers with H(3) = 16.0, p<0.001 for Knowledge, H(3) = 27.1, p<0.001 for Attitude and H(3) = 15.8, p<0.001 for Practice sections. Generally, the SNs obtained the highest mean rank score in the knowledge and practice sections but the EDs obtained the highest mean rank score in the attitude section. Some of the responses implied that our healthcare providers have the victim-blaming tendency that can negatively impact the victims.

    CONCLUSION: Healthcare providers must not only have adequate knowledge but also the non-judgemental attitude towards victims in OSCC.
  8. Chew KS, Kueh YC, Abdul Aziz A
    BMC Med Educ, 2017 Mar 21;17(1):58.
    PMID: 28320367 DOI: 10.1186/s12909-017-0897-0
    BACKGROUND: Despite their importance on diagnostic accuracy, there is a paucity of literature on questionnaire tools to assess clinicians' awareness toward cognitive errors. A validation study was conducted to develop a questionnaire tool to evaluate the Clinician's Awareness Towards Cognitive Errors (CATChES) in clinical decision making.

    METHODS: This questionnaire is divided into two parts. Part A is to evaluate the clinicians' awareness towards cognitive errors in clinical decision making while Part B is to evaluate their perception towards specific cognitive errors. Content validation for both parts was first determined followed by construct validation for Part A. Construct validation for Part B was not determined as the responses were set in a dichotomous format.

    RESULTS: For content validation, all items in both Part A and Part B were rated as "excellent" in terms of their relevance in clinical settings. For construct validation using exploratory factor analysis (EFA) for Part A, a two-factor model with total variance extraction of 60% was determined. Two items were deleted. Then, the EFA was repeated showing that all factor loadings are above the cut-off value of >0.5. The Cronbach's alpha for both factors are above 0.6.

    CONCLUSION: The CATChES questionnaire tool is a valid questionnaire tool aimed to evaluate the awareness among clinicians toward cognitive errors in clinical decision making.

  9. Chew KS, van Merriënboer J, Durning SJ
    BMC Res Notes, 2016 Sep 17;9(1):445.
    PMID: 27639851 DOI: 10.1186/s13104-016-2249-2
    Although a clinician may have the intention of carrying out strategies to reduce cognitive errors, this intention may not be realized especially under heavy workload situations or following a period of interruptions. Implementing strategies to reduce cognitive errors in clinical setting may be facilitated by a portable mnemonic in the form of a checklist.
  10. Chew KS, Tan TW, Ooi YT
    Singapore Med J, 2011 Apr;52(4):252-6.
    PMID: 21552785
    In a multiethnic nation, it is not uncommon for doctors to encounter patients of different cultural backgrounds. Often, patients' cultural beliefs influence their perception of health and illnesses, and their treatment option. Many Chinese cultural beliefs are influenced by the Taoist concept of yin-yang balance.
  11. Chew KS, Kamarudin H, Hashim CW
    Int J Emerg Med, 2012 Apr 13;5:16.
    PMID: 22503137 DOI: 10.1186/1865-1380-5-16
    BACKGROUND: Conventionally, a nebulized short-acting β-2 agonist like salbutamol is often used as the reliever in acute exacerbations of asthma. However, recent worldwide respiratory outbreaks discourage routine use of nebulization. Previous studies have shown that combined budesonide/formoterol (Symbicort®, AstraZeneca) is effective as both a maintenance and reliever anti-asthmatic medication.

    METHODS: We performed a randomized, open-label study from March until August 2011 to compare the bronchodilatory effects of Symbicort® vs. nebulized salbutamol in acute exacerbation of mild to moderate asthmatic attack in an emergency department. Initial objective parameters measured include the oxygen saturation, peak expiratory flow rate (PEFR) and respiratory rate. During clinical reassessment, subjective parameters [i.e., Visual Analog Scale (VAS) and 5-point Likert scale of breathlessness] and the second reading of the objective parameters were measured. For the 5-point Likert scale, the patients were asked to describe their symptom relief as 1, much worse; 2, a little worse; 3, no change; 4, a little better; 5, much better.

    RESULTS: Out of the total of 32 patients enrolled, 17 patients (53%) were randomized to receive nebulized salbutamol and 15 (47%) to receive Symbicort®. For both treatment arms, by using paired t- and Wilcoxon signed rank tests, it was shown that there were statistically significant improvements in oxygen saturation, PEFR and respiratory rate within the individual treatment groups (pre- vs. post-treatment). Comparing the effects of Symbicort® vs. nebulized salbutamol, the average improvement of oxygen saturation was 1% in both treatment arms (p = 0.464), PEFR 78.67 l/min vs. 89.41 l/min, respectively (p = 0.507), and respiratory rate 2/min vs. 2/min (p = 0.890). For subjective evaluation, all patients reported improvement in the VAS (average 2.45 cm vs. 2.20 cm), respectively (p = 0.765). All patients in both treatment arms reported either "a little better" or "much better" on the 5-point Likert scale, with none reporting "no change" or getting worse.

    CONCLUSION: This study suggests that there is no statistical difference between using Symbicort® vs. nebulized salbutamol as the reliever for the first 15 min post-intervention.

  12. Chew BH, Than TL, Chew KS, Jamaludin NK, Hassan H
    Med J Malaysia, 2012 Dec;67(6):571-6.
    PMID: 23770947 MyJurnal
    INTRODUCTION: Our study was to examine prevalence and treatment outcomes of medical emergencies at two urban public health clinics in the Petaling district, Selangor, Malaysia.
    METHODS: A prospective universal sampling was employed to recruit all emergencies over one month period (12 April to 11 May 2011). A structured case record form was used to capture demographic data, whether the index case was selfpresenting or decided by health care workers as a medical emergency, presenting complaints, diagnoses, concurrent chronic diseases and their treatment outcomes at the clinic level. Emergency presentations and diagnoses were classified according to the International Classification of Primary Care, revised second edition (ICPC-2-R).
    RESULTS: A total of 125 medical emergencies with 276 presenting complaints were recorded. The mean age was 30.7 years old (SD 19.9). The prevalence of medical emergency was 0.56% (125/22,320). Chief complaints were mainly from ICPC-2-R chapter R (respiratory system) and chapter A (general and unspecified), 40.0% and 28.0% respectively. The most common diagnosis was acute exacerbation of bronchial asthma (34.6%). Forty percent were referred to hospitals. After adjusting for age and gender, patients who presented with painful emergency (OR 4.9 95% CI 2.0 to 11.7), cardiovascular emergency (OR 63.4 95% CI 12.9 to 310.4) and non-respiratory emergency were predictors of hospital referral (OR 4.6 95% CI 1.1 to 19.1).
    CONCLUSION: There was about one medical emergency for every 200 patients presenting to these urban public polyclinics which were mainly acute asthma. More than half were discharged well and given a follow-up.
    Study site: Klinik Kesihatan Seri Kembangan and Klinik Kesihatan Puchong, Selangor, Malaysia
  13. Chew KS, Yazid MN, Kamarul BA, Rashidi A
    Med J Malaysia, 2009 Sep;64(3):205-9.
    PMID: 20527268
    This voluntary, anonymous questionnaire survey was performed to assess the willingness of Basic Life Support (BLS) participants to perform bystander cardiopulmonary resuscitation (CPR). A total of 55 dental students and 73 school teachers were assessed on their willingness to perform bystander CPR after completion of their BLS training. In general, only 29.0% of the total 128 participants said that they would offer to perform CPR under any cardiac arrest condition and 69.0% said that they would just offer to call the ambulance but they would not offer to perform CPR. When analyzed separately, only 16.4% of school teachers said that they would perform CPR as compared to 45.5% of dental students (p < 0.001). Knowing how to perform CPR does not necessarily translate into willingness to perform CPR.
  14. Chew KS, van Merrienboer JJG, Durning SJ
    BMC Med Educ, 2019 Jan 10;19(1):18.
    PMID: 30630472 DOI: 10.1186/s12909-018-1451-4
    BACKGROUND: Establishing a diagnosis is a complex, iterative process involving patient data gathering, integration and interpretation. Premature closure is a fallacious cognitive tendency of closing the diagnostic process before sufficient data have been gathered. A proposed strategy to minimize premature closure is the use of a checklist to trigger metacognition (the process of monitoring one's own thinking). A number of studies have suggested the effectiveness of this strategy in classroom settings. This qualitative study examined the perception of usability of a metacognitive mnemonic checklist called TWED checklist (where the letter "T = Threat", "W = What if I am wrong? What else?", "E = Evidence" and "D = Dispositional influence") in a real clinical setting.

    METHOD: Two categories of participants, i.e., medical doctors (n = 11) and final year medical students (Group 1, n = 5; Group 2, n = 10) participated in four separate focus group discussions. Nielsen's 5 dimensions of usability (i.e. learnability, effectiveness, memorability, errors, and satisfaction) and Pentland's narrative network were adapted as the framework to study the usability and the implementation of the checklist in a real clinical setting respectively.

    RESULTS: Both categories (medical doctors and medical students) of participants found that the TWED checklist was easy to learn and effective in promoting metacognition. For medical student participants, items "T" and "W" were believed to be the two most useful aspects of the checklist, whereas for the doctor participants, it was item "D". Regarding its implementation, item "T" was applied iteratively, items "W" and "E" were applied when the outcomes did not turn out as expected, and item "D" was applied infrequently. The one checkpoint where all four items were applied was after the initial history taking and physical examination had been performed to generate the initial clinical impression.

    CONCLUSION: A metacognitive checklist aimed to check cognitive errors may be a useful tool that can be implemented in the real clinical setting.

  15. Chew KS, van Merrienboer JJG, Durning SJ
    BMC Med Educ, 2017 Nov 29;17(1):234.
    PMID: 29187172 DOI: 10.1186/s12909-017-1078-x
    BACKGROUND: A key challenge clinicians face when considering differential diagnoses is whether the patient data have been adequately collected. Insufficient data may inadvertently lead to premature closure of the diagnostic process. This study aimed to test the hypothesis that the application of a mnemonic checklist helps to stimulate more patient data collection, thus leading to better diagnostic consideration.

    METHODS: A total of 88 final year medical students were assigned to either an educational intervention group or a control group in a non-equivalent group post-test only design. Participants in the intervention group received a tutorial on the use of a mnemonic checklist aimed to minimize cognitive errors in clinical decision-making. Two weeks later, the participants in both groups were given a script concordance test consisting of 10 cases, with 3 items per case, to assess their clinical decisions when additional data are given in the case scenarios.

    RESULTS: The Mann-Whitney U-test performed on the total scores from both groups showed no statistical significance (U = 792, z = -1.408, p = 0.159). When comparisons were made for the first half and the second half of the SCT, it was found that participants in the intervention group performed significantly better than participants in the control group in the first half of the test, with median scores of 9.15 (IQR 8.00-10.28) vs. 8.18 (IQR 7.16-9.24) respectively, U = 642.5, z = -2.661, p = 0.008. No significant difference was found in the second half of the test, with the median score of 9.58 (IQR 8.90-10.56) vs. 9.81 (IQR 8.83-11.12) for the intervention group and control group respectively (U = 897.5, z = -0.524, p = 0.60).

    CONCLUSION: Checklist use in differential diagnoses consideration did show some benefit. However, this benefit seems to have been traded off by the time and effort in using it. More research is needed to determine whether this benefit could be translated into clinical practice after repetitive use.

  16. Chew KS, Wong SSL, Siew KL, Ab-Rahim R
    Med J Malaysia, 2023 Jan;78(1):118-123.
    PMID: 36715201
    INTRODUCTION: Although healthcare service industry has been thriving in Malaysia, the types of healthcare service quality models used in past research as well as their key messages had not been explored. A scoping review was performed to determine the validated healthcare service quality models, the key messages of these past studies and potential research gaps that should be addressed in future studies.

    MATERIALS AND METHODS: Relevant, peer-reviewed, Englishlanguage articles on healthcare service quality in Malaysia were independently searched by the authors using the SCOPUS and EMERALD databases. Articles that do not directly address healthcare service quality within the Malaysian setting were excluded. Additional articles were identified from the reference lists of the selected articles and from Google search engine. A total of 43 out of 2,749 articles were selected.

    RESULTS: Most of these studies (28 out of the 43 articles, 65.1%) in this scoping review used either the original or a modified version of SERVQUAL instrument to measure healthcare service quality. Significant positive relationships between tangibles, assurance and empathy with patient satisfaction were identified. As SERVQUAL primarily measures the functional dimension of service quality, this suggests that past studies on Malaysian healthcare services emphasised heavily on the functional dimension of healthcare service quality. Functional dimension refers to the expressive performance on how the healthcare service is rendered whereas technical dimension refers to the types of services rendered as well as its safety and efficacy.

    CONCLUSION: A pertinent research gap identified in this review is the lack of studies that measure both technical and functional dimensions comprehensively. Future research should adopt a more holistic (incorporating both technical dimension and functional dimension) measurement of healthcare service quality.

  17. Chew KS, Durning SJ, van Merriënboer JJ
    Singapore Med J, 2016 Dec;57(12):694-700.
    PMID: 26778635 DOI: 10.11622/smedj.2016015
    INTRODUCTION: Metacognition is a cognitive debiasing strategy that clinicians can use to deliberately detach themselves from the immediate context of a clinical decision, which allows them to reflect upon the thinking process. However, cognitive debiasing strategies are often most needed when the clinician cannot afford the time to use them. A mnemonic checklist known as TWED (T = threat, W = what else, E = evidence and D = dispositional factors) was recently created to facilitate metacognition. This study explores the hypothesis that the TWED checklist improves the ability of medical students to make better clinical decisions.

    METHODS: Two groups of final-year medical students from Universiti Sains Malaysia, Malaysia, were recruited to participate in this quasi-experimental study. The intervention group (n = 21) received educational intervention that introduced the TWED checklist, while the control group (n = 19) received a tutorial on basic electrocardiography. Post-intervention, both groups received a similar assessment on clinical decision-making based on five case scenarios.

    RESULTS: The mean score of the intervention group was significantly higher than that of the control group (18.50 ± 4.45 marks vs. 12.50 ± 2.84 marks, p < 0.001). In three of the five case scenarios, students in the intervention group obtained higher scores than those in the control group.

    CONCLUSION: The results of this study support the use of the TWED checklist to facilitate metacognition in clinical decision-making.

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