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  1. Theyvan Balakrishnan T, Bilal A, Fitzpatrick N, Dahiya R, Soelar SA, Khalid K, et al.
    Cureus, 2023 Nov;15(11):e48586.
    PMID: 38024046 DOI: 10.7759/cureus.48586
    INTRODUCTION: Over the past decade, there has been a growing interest in the identification and treatment of posterior malleolus fragments, driven by a better understanding of their significance. The Mason & Molloy (M&M) classification system has emerged as a valuable tool for systematically categorizing these fractures and assisting clinicians in formulating treatment. We aim to assess the interobserver reliability of the M&M classification for posterior malleolus fracture by using 20 raters.

    METHODOLOGY: The study was conducted at a major foot and ankle referral center in Wythenshawe, Manchester, UK. Thirty-eight Computed Tomography (CT) scans were evaluated by 20 independent raters: 15 general orthopedic and trauma surgeons plus five foot and ankle surgeons. Each rater classified the posterior malleolus fracture according to M&M classification into type 1, 2A, 2B, 3, or not classifiable. Statistical analysis was done with the R software package and SPSS (v26; IBM Corp., Armonk, NY). Fleiss kappa (κ) coefficient with a 95% confidence interval (CI) was applied.

    RESULTS: The interobserver agreement was moderate with a global κ value of 0.531 (95% CI: 0.518, 0.544). There were good agreements for identifying type 3 M&M (κ=0.785) and those that are not applicable for M&M classification (κ=0.785). There was a strong correlation between all raters in using M&M classification (Tb=0.53-0.59) except for Rater 12.

    CONCLUSION: M&M classification remains a valuable tool to guide the management of patients with these subsets of ankle fractures.

  2. Sellamuthu S, Chowdhury ZZ, Khalid K, Shibly SM, Rahman MM, Rana M, et al.
    Molecules, 2023 Sep 15;28(18).
    PMID: 37764415 DOI: 10.3390/molecules28186640
    In this research, activated carbon (AC) was synthesized from ligno-cellulosic residues of Adansonia kilima (Baobab) wood chips (AKTW) using two-step semi-carbonization and subsequent pyrolysis using microwave-induced heating (MWP) in the presence of a mild activating agent of K2CO3. The influence of process input variables of microwave power (x1), residence time (y1), and amount of K2CO3 (z1) were analysed to yield superior quality carbon having maximum removal efficiencies (R1) for lead (II) cations from waste effluents, fixed carbon percentages (R2), and carbon yield percentages (R3). Analysis of variance (ANOVA) was used to develop relevant mathematical models, with an appropriate statistical assessment of errors. Level factorial response surface methodology (RSM) relying on the Box-Behnken design (BBD) was implemented for the experimental design. The surface area and porous texture of the samples were determined using Brunauer, Emmett, and Teller (BET) adsorption/desorption curves based on the N2 isotherm. Surface morphological structure was observed using field emission scanning electron microscopic (FESEM) analysis. Thermogravimetric analysis (TGA) was carried out to observe the thermal stability of the sample. Change in the carbon content of the samples was determined using ultimate analysis. X-ray diffraction (XRD) analysis was performed to observe the crystalline and amorphous texture of the samples. The retention of a higher proportion of fixed carbon (80.01%) ensures that the synthesized adsorbent (AKTWAC) will have a greater adsorption capacity while avoiding unwanted catalytic activity for our synthesized final sample.
  3. Saidu MF, Mashita M, Khadijah K, Fazan F, Khalid KA
    Med J Malaysia, 2004 May;59 Suppl B:85-6.
    PMID: 15468831
    Hydroxyapatite is a calcium phosphate bioceramic that has been shown by many authors to be biocompatible with bioactive properties. It is widely accepted as the best synthetic material available for surgical use as a bone graft substitute. HA granules produced by AMREC-SIRIM from local materials underwent 5 types of sterilisation techniques with different ageing periods. Samples were tested for chemical and phase composition and microbial contamination before and after being sterilised. From the microbiological tests done, none of the unsterilised positive control yielded a positive culture. Results from X-Ray diffraction studies found that all the sterilisation techniques did not chemically degrade or structurally change the HA granules significantly.
  4. Nur Hanis Y, Raman P, Premala Devi S, Mohd Khalid KH
    Med J Malaysia, 2019 08;74(4):296-299.
    PMID: 31424036
    OBJECTIVE: The Ministry of Health introduced the cluster hospital project in Kuala Pilah district in 2016 to allow sharing of resources between the hospitals in the same vicinity. The aim of this study is to compare the demographic profile, prevalence of cataract blindness and low vision among patients who presented for cataract surgery before and after the programme.

    METHODOLOGY: This is a retrospective cohort study of patients who underwent cataract surgery in Kuala Pilah Cluster Hospitals between 2010 and 2017. A total of 2539 records of patients were reviewed. Patients were assigned into two groups: Group 1 (2010-2012)- before the programme (2010-2012) and Group 2 (2015-2017) after the introduction of the programme.

    RESULTS: There was a significant increase in number of cataract cases in the district hospital after the cluster initiative. The mean age of patients undergoing cataract surgery was similar in both groups. The common comorbidities were hypertension (Group 1=57.3%; Group 2=70.8%) and diabetes mellitus (Group 1=40.6%; Group 2=51.1%). In 2010-2012, most of the patients were one eye blind (34.4%), whereas in 2015-2017 majority of patients presented with vision better than 6/18 (43.5%). The proportion of patients with cataract blindness reduced from 6% in 2010-2012 to 4.3% in 2015-2017 (p<0.01).

    CONCLUSION: There is a significant decrease in percentage of patients with cataract blindness and low vision after the introduction of Kuala Pilah Cluster Hospital Program. We believe that that cluster hospital system is effective in improving accessibility to eye care and therefore increases the cataract detection rate.
  5. Nazri MY, Hafiz A, Yusof A, Khalid KA, Aminudin CA
    Med J Malaysia, 2005 Jul;60 Suppl C:11-3.
    PMID: 16381275
    A descriptive prospective study of 16 children with injuries inflicted by bicycle spokes and chain was undertaken to identify the demographic profiles of such injuries. Aspects of preventive measures are proposed.
  6. Mohd Noh MA, Khalid K, Ariffin A, Khan MN
    J Oleo Sci, 2016;65(9):749-58.
    PMID: 27581491 DOI: 10.5650/jos.ess16048
    The present study is focused on the effect of the TTABr/MX/H2O-nanoparticles on the rate of piperidinolysis of ionized phenyl salicylate where TTABr represents tetradecyltrimethylammonium bromide and MX = NaCl, NaBr and CnH2n+1CO2Na with n = 4, 5, 6 and 7. Pseudo-first-order rate constant for the piperidinolysis of ionized phenyl salicylate at 35°C and constant concentration [PSa(-)]T = 0.2 mM, [Pip]T = 0.1 M, [NaOH] = 30 mM, [TTABr]T and different [MX] follow an empirical relationship which gives two empirical constant, (X)kcat and K(X/S). The value of relative counterion (X) binding constant, RX(Br) were calculated from the relationship; RX(Br) = (X)kcat/(Br)kcat. The values of RX(Br) for X = C4H9CO2(-), C5H11CO2(-), C6H13CO2(-), and C7H15CO2(-) are increasing with increase in the number of alkyl chain of counterion X.
  7. Lubis NDA, Haryuna TSH, Khalid K, Zainul R
    Med Glas (Zenica), 2023 Aug 01;20(2).
    PMID: 37018057 DOI: 10.17392/1554-23
    Aim To assess the cochlear damage caused by cisplatin in the rat cochlea based on decreased signal to noise ratio (SNR) values on otoacoustic emission (OAE) examination and increased expression of signal transducer and activator of transcription 1 (STAT 1) and vascular endothelial growth factor (VEGF) on immunohistochemical examination. Methods Twenty-four Rattus norvegicus were divided into 4 groups and injected with 8 mg/kgBW of cisplatin intraperitoneally except for control group. The SNR on OAE examination were checked before the treatment and on day 3, 4, and 7 after the treatment. The cochleas were stained immunohistochemically, followed by assessment of the cochlear organ of Corti damage based on STAT 1 and VEGF expression. Results A decrease in the mean of SNR value was found in accordance with the length of cisplatin exposure. The STAT 1 and VEGF expression increased with duration of cisplatin exposure. A correlation was found between SNR values, STAT 1, and also VEGF expression (p<0.05). Conclusion An increase of STAT 1 and VEGF expression influences cochlear damage due to cisplatin administration. There was a correlation between STAT 1 and VEGF expression with SNR values in the cochlear organ of Corti of Rattus norvegicus exposed to cisplatin.
  8. Ku Md Saad S, Khalid K, Glackin S
    Oxf Med Case Reports, 2023 Feb;2023(2):omad015.
    PMID: 36860957 DOI: 10.1093/omcr/omad015
    Scurvy is a rare nutritional deficiency, particularly in developed nations. Sporadic cases are still reported, particularly among alcoholics and malnourished. Herein we present an unusual case of a previously healthy 15-year-old Caucasian girl, who was recently hospitalized for low velocity spine fractures, back pain and stiffness over several months and rash for 2 years. She was later diagnosed with scurvy and osteoporosis. Dietary modifications were instituted together with supplementary vitamin C, supportive treatment with regular dietician review and physiotherapy. Gradual clinical recovery was seen over the course of therapy. Our case highlights the importance of recognizing scurvy even among low-risk populations to ensure prompt and effective clinical management.
  9. Khalid KA, Zakaria Z, Toung OP, McOrist S
    Vet Rec, 2009 May 16;164(20):626-7.
    PMID: 19448256
  10. Khalid K, Tan X, Mohd Zaid HF, Tao Y, Lye Chew C, Chu DT, et al.
    Bioengineered, 2020 12;11(1):328-355.
    PMID: 32138595 DOI: 10.1080/21655979.2020.1736240
    With the unique properties such as high surface area to volume ratio, stability, inertness, ease of functionalization, as well as novel optical, electrical, and magnetic behaviors, nanomaterials have a wide range of applications in various fields with the common types including nanotubes, dendrimers, quantum dots, and fullerenes. With the aim of providing useful insights to help future development of efficient and commercially viable technology for large-scale production, this review focused on the science and applications of inorganic and organic nanomaterials, emphasizing on their synthesis, processing, characterization, and applications on different fields. The applications of nanomaterials on imaging, cell and gene delivery, biosensor, cancer treatment, therapy, and others were discussed in depth. Last but not least, the future prospects and challenges in nanoscience and nanotechnology were also explored.
  11. Khalid K, Ahmad RE, Tong AYH, Lui SY, Abidin IZZ
    PMID: 34027217 DOI: 10.5114/amsad.2021.105410
    Introduction: Despite the common occurrence of streptokinase-induced hypotension among patients with acute myocardial infarction, the underlying pathophysiology remains obscure and poorly understood. Our study aimed to pool clinical evidence on the potential mechanism of streptokinase-induced hypotension through a systematic review of the literature.

    Material and methods: We conducted literature search from Medline, Scopus and Web of Science on clinical studies related to streptokinase-induced hypotension.

    Results: Our search yielded 972 citations. After removal of duplicates, 878 articles were screened for eligibility, of which 856 papers were excluded due to various reasons. Of the remaining 22 articles retrieved with full texts, eight relevant articles were selected for final analysis. Three themes emerged as the proposed mechanisms of streptokinase-induced hypotension, including (i) reduction in total peripheral resistance, (ii) complement activation, and (iii) dismissal of hypotheses involving other intermediaries.

    Conclusions: Our findings suggest that the underlying mechanism of streptokinase-induced hypotension lies primarily in the reduction in total peripheral resistance.

  12. Khalid K, Noh MAM, Khan MN, Ishak R, Penney E, Chowdhury ZZ, et al.
    Micron, 2017 Sep;100:30-33.
    PMID: 28477556 DOI: 10.1016/j.micron.2017.04.010
    This paper discusses the unprecedented microscopic findings of micellar growth in colloidal system (CS) of catalyzed piperidinolysis of ionized phenyl salicylate (PS-). The giant vesicles (GV) was observed under the optical polarization microscope (OPM) at [NaX]=0.1M where X=3-isopropC6H4O-. The conditions were rationalized from pseudo-first-order rate constant, kobs of PS- of micellar phase at 31.1×10-3s-1 reported in previous publication. The overall diameter of GV (57.6μm) in CS (CTABr/NaX/H2O)-catalyzed piperidinolysis (where X=3-isopropC6H4O) of ionized phenyl salicylate were found as giant unilamellar vesicles (GUV) and giant multilamellar vesicles (GMV). The findings were also validated by means of rheological analysis.
  13. Khalid K, Noh MAM, Zain SM, Khan MN
    Top Curr Chem (Cham), 2017 Apr;375(2):45.
    PMID: 28357712 DOI: 10.1007/s41061-017-0132-9
    The efficiency of counterion affinity towards ionic micelles is often described in terms of the degree of counterion binding (β X ) to ionic micelles or the conventional ion-exchange constant ([Formula: see text]) or relative binding constant ([Formula: see text]) of X - and Br- counterions. This review describes the use of ionized phenyl salicylate ions, PSa-, as a new probe to determine [Formula: see text] values using a semiempirical spectrophotometric method. The value of [Formula: see text] is found to be comparable to reported values obtained using different probes by the semiempirical kinetic method as well as different physical methods. Application of semiempirical methods for calculation of [Formula: see text] or [Formula: see text] values involves an inherent assumption that these values are independent of the physicochemical characteristics of the probe molecule.
  14. Khalid K, Anuar A, Ang WC, Jamaluddin R
    Curr Drug Saf, 2023;18(2):167-174.
    PMID: 35570535 DOI: 10.2174/1574886317666220514154931
    BACKGROUND: Per oral methadone maintenance therapy [MMT] was introduced as part of harm reduction strategy to manage rising numbers of HIV infections caused by intravenous use of illicit drugs.

    METHOD: We aim to review published articles related to the side effects of long-term methadone therapy, focusing on hematological derangements in human studies published between 1 January 2000 till 31 January 2021.

    RESULTS: Our search databases include Web of Science, Scopus, and Medline. Our search yielded 971 articles, of which 55 articles were related to the effects of MMT on various organ systems: cardiovascular [n=12], respiratory [n=1], endocrine [n=10], central nervous system [n=12], neurobehavioral [n=10], gastrointestinal [n=1], and bone [n=1]. There were eight articles specifically related to the hematological side effects of chronic methadone therapy that include [i] immune system hyperactivation, [ii] reduced circulating lymphocytes, and [iii] increased blood viscosity.

    CONCLUSION: In view of all foreseeable health risks seen with prolonged methadone therapy, pharmacological modulation is warranted to find a better substitute for managing patients with opioid dependence.

  15. Khalid K, Ku Md Saad S, Soelar SA, Mohamed Yusof Z, Warijo O
    J Ethn Subst Abuse, 2023;22(1):121-132.
    PMID: 33784945 DOI: 10.1080/15332640.2021.1906816
    Kratom is a plant homogenous to Southeast Asia with a long history of traditional use as medicinal herbs. However, recent years have witnessed its pervasive infiltration into international audience with growing public health concern. This cross-sectional study was conducted from 1 August 2017 till 31 August 2018 aiming to explore the practice and perspectives of kratom use and misuse among adolescents in northwest Malaysia. The study involved a self-administered questionnaire that was designed for the purpose of the study. The instrument had undergone prior validation process with a good overall internal reliability for the knowledge domain (Cronbach's alpha = 0.728) and attitude domain (Cronbach's alpha = 0.700). The questionnaire was distributed to 135 respondents involving adolescents aged 13 to 19 years old via convenience (non-kratom user) and snowball sampling (kratom users). There were 65 (47.8%) kratom users, while 70 (51.5%) were kratom-naïve. Among the kratom users, peer influence was the most common reason for them to be first involved with kratom, 26 (41.3%) whereas the reasons for kratom use quoted were to improve physical stamina, 10 (16.4%), as painkiller, 9 (14.8%), and to be accepted by peers, 7 (11.5%). Multiple logistic regression found that older age (95% CI: 0.13, 0.58; p = 0.001) and being active smokers (95% CI: 39.33, 980.63; p 
  16. Khalid K, Ooi YT, Abdul Rashid Q, Mohammad Yusoff MZA, Jamaluddin R
    East Asian Arch Psychiatry, 2022 Sep;32(3):47-50.
    PMID: 36172721 DOI: 10.12809/eaap2214
    OBJECTIVES: To determine the prevalence of continued illicit drug use among people enrolled in methadone maintenance treatment (MMT), the association between hepatitis C status and methadone dosage, and the predictors for illicit drug abstinence during MMT.

    METHODS: Clinical records of active opioid dependents who underwent MMT between 1 January 2007 and 31 March 2021 in Hospital Tuanku Fauziah, Perlis, Malaysia were retrospectively reviewed. Data collected included baseline demographics, history of illicit drug use, temporal trend in methadone dosage modulation, and co-use of illicit drugs during the MMT.

    RESULTS: A total of 87 patients (mean age, 43.9 ± 8.33 years) were included. Their mean duration of involvement in MMT was 7.8 ± 3.69 years. The most commonly used drug was heroin (88.5%), followed by kratom (51.7%). Between 2019 and 2021, 61 (70.1%) patients had ceased abusing opioid, but 51 (58.6%) patients continued using any of the illicit drugs. Methamphetamine and amphetamine co-use was most common (n = 12, 37.5%). Hepatitis C status was not associated with the current methadone dose (U = 539.5, p = 0.186) or the highest dose required (t = -0.291, df = 74, p = 0.772). No predictor for illicit drug abstinence during MMT was identified. Methadone dose positively correlated with frequency of defaulting treatments (r = 0.22, p = 0.042).

    CONCLUSION: Among our patients, MMT for opioid dependents cannot sufficiently curb illicit drug use, and there is a shift toward stimulants abuse.

  17. Khalid K, Apparow S, Mushaddik IL, Anuar A, Rizvi SAA, Habib A
    J Endocr Soc, 2023 Aug 28;7(10):bvad112.
    PMID: 37693687 DOI: 10.1210/jendso/bvad112
    CONTEXT: Ketogenic diet has recently made a comeback as a part of lifestyle and dietary modifications in patients with polycystic ovary syndrome (PCOS). Despite studies suggesting its beneficial effects in reversing hormonal imbalance in women with PCOS, evidence has been patchy and derived from small populations under varying conditions.

    OBJECTIVE: To pool evidence from clinical trials to study the effects of ketogenic diet on reproductive hormones (LH/FSH ratio, free testosterone, serum progesterone) and observe evidence of weight change.

    METHODS: PubMed, ScienceDirect, Scopus, and Web of Science core collection were searched for clinical trials evaluating the effects of ketogenic diet in established PCOS women consistent with the Rotterdam classification. Single- or double-arm studies that included an outcome of interest were included. Two investigators worked independently to screen potential articles and a designated investigator extracted data on study characteristics and evaluated the outcomes. Data were pooled using a random-effects model. The quality of selected studies was assessed using the Cochrane Risk of Bias Tool.

    RESULTS: Following ≥45 days of intervention with ketogenic diet among women with PCOS, significant improvement was observed in reproductive hormone levels, with reduced LH/FSH ratio (d -0.851; 95% CI -1.015, -0.686; P < .001), reduced serum free testosterone (d -0.223; 95% CI -0.328, -0.119; P  < .001), and an increased in serum sex hormone binding globulin (SHBG) (d 9.086; 95% CI 3.379, 14.792; P = .002). Significant weight loss was unanimously observed in all included studies (d -11.56; 95% CI -14.97, -8.15; P < .001).

    CONCLUSION: Short-term ketogenic diet potentially improved hormonal imbalances commonly associated with PCOS.

  18. Khalid K, Jamaluddin R, Ismail MS
    BMJ Open Qual, 2023 Jun;12(2).
    PMID: 37277216 DOI: 10.1136/bmjoq-2022-002139
    BACKGROUND: Poor employment rate among psychiatric patients is poorly discussed.

    PURPOSE: To share our strategies in boosting employment rate among stable psychiatric patients and discuss the lessons learnt.

    PARTICULAR FOCUS: Multifaceted strategies were remodelled to ensure a three-dimensional optimisation: (1) strengthening clinical service to ensure stable disease and appropriate patient selection through battery of assessments, (2) provision of psychosocial support to boost self-esteem and foster discipline among patients through encouragement, guidance and regular monitoring by the multidisciplinary community mental health team and (3) encourage willingness and confidence among stakeholders and local market to host job opportunities to stable mental health patients.

    OVERVIEW: The yearly employment rate among our stable psychiatric patients under supported employment programme from 2020 to 2021 was 28.6% (2/7) and 30.0% (3/10), respectively. A qualitative survey found the main hindrance to recruitment were employers' scepticism on work performance, while poor work retention was due to patients' lack of specific skill set and discipline to adhere to routine. We restructured our supported employment programme by adding the role of community mental health facility to foster discipline and routine for 6 months prior to referral to a job coach. Until June 2022, two out of five patients managed to secure job positions (40.0%). Despite our efforts to improve employment with the instituted remedial strategy, we still fail to reach the minimum standard set by ministry. Future plan will focus on tailoring individual interests to a specific set of skills that match industrial expectation prior to seeking employment. Additionally, enhancing public education using social media may foster better inclusion of psychiatric patients and social acceptance.

  19. Khalid K, Poh CL
    Adv Med Sci, 2023 Sep;68(2):213-226.
    PMID: 37364379 DOI: 10.1016/j.advms.2023.05.003
    BACKGROUND: The COVID-19 pandemic exerted significant impacts on public health and global economy. Research efforts to develop vaccines at warp speed against SARS-CoV-2 led to novel mRNA, viral vectored, and inactivated vaccines being administered. The current COVID-19 vaccines incorporate the full S protein of the SARS-CoV-2 Wuhan strain but rapidly emerging variants of concern (VOCs) have led to significant reductions in protective efficacies. There is an urgent need to develop next-generation vaccines which could effectively prevent COVID-19.

    METHODS: PubMed and Google Scholar were systematically reviewed for peer-reviewed papers up to January 2023.

    RESULTS: A promising solution to the problem of emerging variants is a DNA vaccine platform since it can be easily modified. Besides expressing whole protein antigens, DNA vaccines can also be constructed to include specific nucleotide genes encoding highly conserved and immunogenic epitopes from the S protein as well as from other structural/non-structural proteins to develop effective vaccines against VOCs. DNA vaccines are associated with low transfection efficiencies which could be enhanced by chemical, genetic, and molecular adjuvants as well as delivery systems.

    CONCLUSIONS: The DNA vaccine platform offers a promising solution to the design of effective vaccines. The challenge of limited immunogenicity in humans might be solved through the use of genetic modifications such as the addition of nuclear localization signal (NLS) peptide gene, strong promoters, MARs, introns, TLR agonists, CD40L, and the development of appropriate delivery systems utilizing nanoparticles to increase uptake by APCs in enhancing the induction of potent immune responses.

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