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  1. Lee SW, Loo CH, Tan WC
    Med J Malaysia, 2018 10;73(5):338-339.
    PMID: 30350820 MyJurnal
    Confluent and reticulated papillomatosis (CRP) was first described in 1927 by Gougerot and further characterised by Carteud.1 It is relatively rare, and the exact pathophysiology was not well known. Over the years, multiple treatment modalities were proposed. We report our experience with three cases of CRP which showed complete clearance with tetracycline group of antibiotics.
  2. Ng HK, Loo CH, Lim MS
    Malays J Med Sci, 2024 Jun;31(3):125-132.
    PMID: 38984250 DOI: 10.21315/mjms2024.31.3.9
    BACKGROUND: Supine percutaneous nephrolithotomy (s-PCNL) offers great benefits from urological and anaesthetic points of view. We present the first evaluation of the outcomes of s-PCNL in Malaysia. Our aim was to explore the safety and efficacy of s-PCNL.

    METHODS: Institutional review board approval was obtained from the National Medical Research Register (NMRR ID-21002225-WLP). We retrospectively reviewed 115 patients with renal pelvis stones who underwent single renal access during s-PCNL between November 2020 and May 2023. Patients who underwent simultaneous ipsilateral or contralateral endourological procedures were included. The data were analysed to determine stone-free rates (SFR), major complication rates, blood transfusion rates, operative times and lengths of hospital stay (LOS).

    RESULTS: The SFR was higher for the single middle calyceal renal access (MCA) group than for the lower calyceal renal access (LCA) or upper calyceal renal access (UCA) groups (OR: 1.76; 95% confidence interval [CI]: 0.63, 4.92). In total, 0, 1 and 2 patients had major complications in the UCA, MCA and LCA groups, respectively (P = 0.453). One of the 115 patients (0.9%) needed blood transfusion. Subgroup analysis revealed mean operative times of 76.3 min and 78.6 min for patients who underwent sole s-PCNL (PCNL-only group) and those who had simultaneous ipsilateral and contralateral endourological procedures (PCNL-plus group), respectively (P = 0.786). The overall mean LOS was 2.9 days.

    CONCLUSION: s-PCNL is a safe and effective alternative treatment for renal stones. We would recommend s-PCNL for patients who require an ipsilateral/contralateral endourological procedure (URS/RIRS) because it is time-efficient. All renal accesses are safe. Single MCA is recommended for complete stone clearance.

  3. Loo CH, Chan YC, Lee KQ, Tharmalingam P, Tan WC
    Med J Malaysia, 2015 Jun;70(3):177-81.
    PMID: 26248781 MyJurnal
    INTRODUCTION: Psoriasis is a common, chronic, relapsing, immune-mediated inflammatory disease. Our objective is to review the clinical profile, co-morbidities, and outcome of patients with psoriasis.
    METHODS: This is a cross-sectional study of outpatient psoriasis patients attending the dermatology clinic, Hospital Sultan Abdul Halim (HSAH) between January 2012 and June 2014. Data collection was based on Malaysian Psoriasis Registry.
    RESULTS: Among 296 patients with psoriasis, Malays were the most common 175 (59.1%), followed by Indians 82 (27.7%), Chinese 37 (12.5%) and others 2 (0.6%). Male to female ratio was 1.2:1. More than half (54.7%) of the patients had early onset disease (age 40 or less). Only 26 patients (8.8%) have positive family history. The most common clinical presentation was chronic plaque psoriasis (89.9%), followed by erythrodermic psoriasis (4.7%), guttate psoriasis (3.0%) and pustular psoriasis (1.7%). Twenty eight percent had nail involvement while arthropathy was seen only in 14.7%. Common triggers were sunlight (46.0%), stress (31.1%), trauma (5.4%), food (4.0%), pregnancy (4.0%), and upper respiratory tract infections (2.7%). Co-morbidities observed include ischaemic heart disease (7.1%), hypertension (26.7%), dyslipidemia (17.6%), and diabetes mellitus (22.0%). All patients were on topical medications. About 6.8% of the patients were treated with phototherapy. One third of patients (35.5%) were given systemic therapy. Out of these, 84 patients (80.0%) were on methotrexate while only 16 (15.2%) on acitretin. None was on cyclosporine or biologic. In term of disease severity, 41.7% of patients had BSA >10% and 31.4% patients had DLQI > 10.
    CONCLUSION: Our patients show a similar clinical profile and outcome as our Malaysian psoriasis population. However they tend to have a more severe disease. There is a need for a more effective targeted therapy for a better outcome.
    Study site: Dermatology clinic, Hospital Sultan Abdul Halim (HSAH), Sungai Petani, Kedah, Malaysia
  4. Loo CH, Tan WC, Khor YH, Chan LC
    Med J Malaysia, 2018 04;73(2):73-77.
    PMID: 29703869 MyJurnal
    INTRODUCTION: Severe cutaneous adverse drug reactions (SCARs) are not uncommon and potentially lifethreatening. Our objective is to study the patient characteristics, the pattern of implicated drugs and treatment outcome among patients with SCARs.

    METHODS: A 10-year retrospective analysis of SCARs cases in Penang General Hospital was carried out from January 2006 to December 2015. Data collection is based on the Malaysian Adverse Drug Reactions Advisory Committee registry and dermatology clinic records.

    RESULTS: A total of 189 cases of SCARs were encountered (F:M ratio; 1.2:1.0; mean age of 45 year). The commonest manifestation was Stevens-Johnson Syndrome [SJS] (55.0%), followed by toxic epidermal necrolysis [TEN] (23.8%), drug rash with eosinophilia and systemic symptoms [DRESS] (12.7%), acute generalised exanthematous pustulosis [AGEP] (4.8%), SJS/TEN overlap syndrome (2.6%) and generalised bullous fixed drug eruptions [GBFDE] (1.1%). Mean time to onset for TEN/SJS/Overlap syndrome was 10.5±13 days; AGEP, three days; GBFDE, 2.5±0.7 days, and DRESS, 29.4±5.7 days. The most common drugs implicated were antibiotics (33.3%), followed by allopurinol (18.9%) and anticonvulsant (18.4%). Out of 154 cases of SJS/TEN/overlap syndrome, allopurinol was the commonest causative agents (20.1%). In DRESS, allopurinol accounts for 45.8% of the cases. The mortality rate in SJS, TEN and DRESS were 1.9%, 13.3% and 12.5% respectively. No mortality was observed in AGEP and GBFDE.

    CONCLUSION: The commonest manifestations of SCARs in our setting were SJS, TEN and DRESS. Allopurinol was the most common culprit. Thus, judicious allopurinol use is advocated and pre-emptive genetic screening for HLAB *5801 should be considered.

  5. Loo Ch, Basri M, Ismail R, Lau H, Tejo B, Kanthimathi M, et al.
    Int J Nanomedicine, 2013;8:13-22.
    PMID: 23293516 DOI: 10.2147/IJN.S35648
    To study the effects of varying lipid concentrations, lipid and oil ratio, and the addition of propylene glycol and lecithin on the long-term physical stability of nanostructured lipid nanocarriers (NLC), skin hydration, and transepidermal water loss.
  6. Loo CH, Khoo ACH, Tan WC, Khor YH, Tang JJ, Tang MM, et al.
    World J Nucl Med, 2020 08 22;20(1):32-37.
    PMID: 33850487 DOI: 10.4103/wjnm.WJNM_33_20
    Hidradenitis suppurativa (HS) is known to have association with systemic diseases with chronic inflammation such as psoriasis. We aim to describe the concomitant systemic inflammation in patients with HS using 18F-fluorodeoxyglucose positron emission tomography-computed tomography (18F-FDG PET/CT) scan. This was a case-control study conducted in three tertiary hospitals in Northern Malaysia from January to December 2017, involving HS patients aged 18 years and above. Thirty-two HS patients with age- and sex-matched controls were recruited with a mean age of 31.4 years (range: 18-56). Numerous cutaneous inflammatory foci were detected on FDG-PET/CT scan in clinically unapparent sites (27/32, 84.4%). Approximately 90.6%, 93.8%, and 50.0% of the patients had significantly higher cutaneous uptake over nasal, mandibular, and scalp regions, respectively (P < 0.0001). PET/CT scan did not detect any systemic inflammation unlike those found in psoriasis. Three (9.4%) patients had thyroid nodules with high uptake (maximum standard uptake values ranging from 2.9 to 11.3). Two of them were confirmed to have papillary thyroid carcinoma, while the third patient has inconclusive finding. 18F-FDG PET/CT scan may be useful to map disease burden of HS. Nonlesional inflammatory foci on the skin of the nose, mandibular, and scalp are probably significant. The association of thyroid carcinoma in HS warrants further evaluation.
  7. Lee JHM, Loo CH, Tan WC, Lee CK, Jamil A, Khor YH
    Dermatol Ther, 2022 Jan;35(1):e15203.
    PMID: 34779102 DOI: 10.1111/dth.15203
    Methotrexate (MTX) is a first-line systemic psoriasis therapy with risk of liver fibrosis. Noninvasive tools for liver fibrosis screening are Fibroscan®, Fibrosis-4 (FIB-4) index, and aspartate aminotransferase-to-platelet ratio (APRI) index. To compare Fibroscan®, FIB-4, and APRI in detecting fibrosis, determine association of fibrosis with MTX cumulative dose, and explore risk factors for fibrosis. A case-control study involving psoriasis patients aged ≥18 years with MTX cumulative dose ≥1 g, with age and sex-matched MTX naïve psoriasis patients was performed. Noninvasive tools were used to assess liver fibrosis. Sixty-one patients on MTX and 54 controls participated. Fibroscan® detected fibrosis in 22 (36.1%) patients on MTX compared to 11 (19.6%) controls (p = 0.05). FIB-4 predicted fibrosis in 13 (21.3%) patients on MTX and in 10 (17.9%) controls (p = 0.64) while APRI diagnosed 7 (11.5%) versus 7 (12.5%), p = 0.65. No significant correlation between Fibroscan® assessed liver stiffness and MTX cumulative dose (p = 0.47). Independent risk factors for liver fibrosis were MTX use with raised alanine aminotransferase (OR = 68.56, 95% CI 8.26; 568.86, p 
  8. Ling WY, Loo CH, Nurul Shafaril Niza MA, Tan JL, Norazlima MA, Tan WC
    Med J Malaysia, 2023 May;78(3):263-269.
    PMID: 37271834
    INTRODUCTION: Acne vulgaris (AV) is a common inflammatory skin disease affecting adolescents and young adults. It affects one's self-esteem and social relationship. In addition, poor adherence to treatment can cause poor treatment response and disease recurrence. This study aims to determine the effectiveness of medical education and counselling on treatment adherence and disease severity.

    METHODS: This is a non-randomised interventional study with age- and treatment- matched control conducted in a tertiary dermatology clinic from July 2021 to June 2022. Patients in the intervention group received a 10 min video presentation on acne, followed by treatment counselling. The adherence rate was determined objectively (pill counting and tube weighing) and subjectively (ECOB questionnaire). The disease severity was assessed using the Comprehensive Acne Severity Scale (CASS) and Global Acne Grading System (GAGS).

    RESULTS: A total of 100 patients completed the 12-week study. With intervention, patients have better adherence to topical medication (5% benzoyl peroxide gel: 71% vs 57.9%, p= 0.031; 0.05% tretinoin cream: 58.7% vs 45.4%, p= 0.044) at week 12. However, the intervention program did not improve adherence to oral medication. Overall, with intervention, a significantly higher percentage of improvement in disease severity was noted (47.3% vs. 39.1%, p=0.044). Nonadherence to treatment was attributed mostly to forgetfulness in 54% of the patients, followed by a busy lifestyle (41%) and little knowledge of acne (26%).

    CONCLUSION: Patients have significantly better adherence to topical medication with education and counselling. Better adherence to treatment leads to more remarkable disease improvement.

  9. Loo YP, Loo CH, Lim AL, Wong CK, Ali NBM, Khor YH, et al.
    Int J Rheum Dis, 2023 Sep;26(9):1788-1798.
    PMID: 37485806 DOI: 10.1111/1756-185X.14833
    INTRODUCTION: Psoriatic arthritis is a chronic, autoimmune inflammatory arthritis that occurs with psoriasis and has profound impact on patients' physical and psychological well-being. This study aims to determine the prevalence and risk factors associated with psoriatic arthritis among patients with psoriasis.

    METHODS: A single-center, cross-sectional study was conducted over a 12-month period at the Dermatology Clinic, Hospital Pulau Pinang, Malaysia involving all consecutive psoriasis patients. CASPAR (ClASsification of Psoriatic ARthritis) criteria were used to diagnose psoriatic arthritis.

    RESULTS: A total of 360 patients with psoriasis were recruited, of whom 107 (29.7%) had psoriatic arthritis. Psoriatic arthritis patients had equal gender distribution and the mean age of arthritis onset was 40.7 ± 12.8 years. Psoriasis preceded arthritis in 81.3% of patients (n = 87) with a mean latency interval of 10.5 years. Polyarthropathy was the predominant subtype affecting 46.8% (n = 50) of patients, followed by oligoarthropathy (22.4%, n = 24), axial joint disease (5.6%, n = 6), predominant distal interphalangeal joint disease (2.8%, n = 3), and mixed subtype (22.4%, n = 24). Enthesitis and dactylitis occurred in 12.1% (n = 13) and 20.6% (n = 22) of arthritis patients, respectively, and deformity was present in 37.4% (n = 40). Psoriatic arthritis was significantly associated with being an ever smoker (adjusted odds ratio [aOR] 0.41; 95% confidence interval [CI] 0.18-0.91, p = .029), genital psoriasis (aOR 2.25; 95% CI 1.17-4.33, p = .015), and increased erythrocyte sedimentation rate (ESR) (aOR 1.02; 95% CI 1.01-1.04, p = .005) and C-reactive protein [CRP] (aOR 1.04; 95% CI 1.00-1.08, p = .040).

    CONCLUSION: Our study showed a high prevalence of psoriatic arthritis among the psoriasis cohort. Genital involvement, and increased ESR and CRP were associated with psoriatic arthritis among patients with psoriasis.

  10. Ngu IS, Ngooi MS, Ng HK, Tee KTL, Loo CH, Lim MS
    Cancer Pathog Ther, 2023 Jan;1(1):33-39.
    PMID: 38328608 DOI: 10.1016/j.cpt.2022.12.001
    BACKGROUND: Freehand transperineal prostate biopsy (TPPBx) using a coaxial needle technique offers an alternative to probe-mounted freehand or template-guided techniques in the diagnosis of prostate cancer (PCa). It only requires the same equipment used for transrectal ultrasound-guided (TRUS) biopsy. Our study is the first in Malaysia to report this experience and its outcomes. We aim to determine PCa detection rate and pain tolerability of freehand TPPBx utilizing a coaxial needle under local anesthesia (LA).

    METHODS: Institutional review board approval was obtained from National Medical Research Register (NMRR ID-21-02052-VIL). We retrospectively reviewed the medical records of patients who underwent TPPBx between August 2020 and April 2022. Records were reviewed for patients' characteristics, prostate volume, prostate-specific antigen (PSA) results, biopsy results and pain tolerability. Data was analyzed to determine PCa and clinically significant prostate cancer (csPCa) detection rate. LA was achieved using perineal skin infiltration and a periprostatic nerve block. The commonly used standard side-firing transrectal ultrasound with its Prostate Biplane Transducer was used as an imaging guide. The principles of the Ginsburg protocol were followed. Pain tolerability was assessed using a visual analog scale.

    RESULTS: A total of 55 patients with elevated PSA levels underwent freehand TPPBx under LA. The mean age was 67.3 years, the median PSA was 14.2 ng/mL, and the median PSA density (PSAD) was 0.33 ng/mL/cc. The optimal PSAD cutoff for predicting csPCa was 0.35 ng/mL/cc (area under the curve [AUC], 0.792; sensitivity, 87.5%; specificity, 69.2%). PCa was detected in 24 patients (43.6%), of whom 16 (29.1%) had csPCa. The median pain scores during LA infiltration and biopsy were four and two, respectively, which were significant different (P 

  11. Loo CH, Tan WC, Tang JJ, Khor YH, Manikam MT, Low DE, et al.
    Int J Dermatol, 2018 Dec;57(12):1454-1463.
    PMID: 30182482 DOI: 10.1111/ijd.14210
    BACKGROUND: Hidradenitis suppurativa (HS) is a chronic, recurrent, inflammatory disorder of follicular occlusion, resulting in abscesses with tunnel formation and severe scarring. Our objectives were to identify the clinical patterns and the prevalence of metabolic syndrome (MetS) among our HS patients and to determine the role of ultrasonography in the clinical assessment of HS.

    METHODS: This was a cross-sectional study carried out from September 2016 to August 2017 at three tertiary hospitals in Northern Peninsular Malaysia.

    RESULTS: A total of 62 patients were recruited, 83.9% of whom were male. The mean age was 29.2 with the median age of onset at 18 years old. The median duration of delay in diagnosis was 3 years. A quarter of them had positive family history. Nearly three-quarters were overweight and obese. About 12/62 (19.4%) had MetS, and it was comparable to healthy controls (15/62, 24.2%). HS patients had a significant higher risk of low-high-density lipoprotein (HDL) and obesity. Based on Hurley staging, 15/62 (24.2%) were in stage I, 38/62 (61.3%) and 9/62 (14.5%) in stages II and III, respectively. However, sonographic scoring showed 50% had severe stage of disease, and 56.9% of the patients had subclinical lesions. There was only a fair agreement between ultrasonography and Hurley staging of disease severity (k = 0.25; P = 0.004).

    CONCLUSION: There was a male preponderance among HS patients in Northern Peninsular Malaysia with early age of onset and more severe disease. Only one-fifth had MetS, but they had significantly higher risks of obesity and low HDL. Ultrasonography examination was useful to detect subclinical lesions and providing a better understanding on disease severity.

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