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  1. Kho SS, Chan SK, Yong MC, Tie ST
    Med J Malaysia, 2020 05;75(3):254-259.
    PMID: 32467541
    INTRODUCTION: Pleural effusion is frequently encountered in respiratory medicine. However, despite thorough assessment including closed pleural biopsy, the cause of around 20% of pleural effusions remains undetermined. Medical thoracoscopy (MT) is the investigation of choice in these circumstances especially if malignancy is suspected. The aim of this study is to evaluate the diagnostic yield of MT in exudative pleural effusions in a single center from East Malaysia.

    METHODS: Retrospective chart review of all adult patients who underwent MT for undiagnosed exudative pleural effusion in a 24-month duration.

    RESULTS: Our cohort comprised of 209 patients with a median age of 61 years old (IQR 48.5-69.5). There were 92 (44%) patients with malignant pleural effusion (MPE) and 117 (56%) benign effusions; which included 85 tuberculous pleural effusion (TBE) and 32 cases of non-tuberculous exudative pleural effusion. Conclusive pathological diagnosis was made in 79.4% of the cases. For diagnosis of MPE, MT had a sensitivity of 89.1% (95% CI 80.4-94.3), specificity of 100% (95% CI 96.0-100.0), and positive predictive value (PPV) of 100% (95% CI 94.4-100) and negative predictive value (NPV) of 92.1% (95% CI 85.6-95.9). For TBE, MT had a sensitivity of 90.5% (95% CI 81.8-95.6), specificity of 100% (95% CI 96.3- 100.0) PPV of 100% (95% CI 94.1-100) and NPV of 93.9% (95% CI 88.0-97.2). Overall complication rate was 3.3%.

    CONCLUSIONS: MT showed excellent sensitivity and specificity in the diagnosis of exudative pleural effusion in this region. It reduces empirical therapy by providing histological evidence of disease when initial non-invasive investigations were inconclusive.

  2. Kho SS, Yong MC, Chan SK, Tie ST
    Thorax, 2018 10;73(10):994-995.
    PMID: 29599199 DOI: 10.1136/thoraxjnl-2018-211729
  3. Kho SS, Chan SK, Yong MC, Tie ST
    BMC Res Notes, 2017 Jul 21;10(1):304.
    PMID: 28732541 DOI: 10.1186/s13104-017-2635-4
    BACKGROUND: Massive hemoptysis is a common encounter in respiratory medicine. Bronchoscopy plays an important role in localizing the origin of bleeding, as well as endoscopic treatment of centrally located lesions. Endobronchial embolization is a novel technique enabling the management of hemoptysis arising even from peripheral lesions, via occlusion of the culprit bronchus, thereby securing the airway. Endobronchial Watanabe Spigot had been advocate in the treatment of bronchopleural fistula and the use of this novel technique had since then been expanded into the management of massive hemoptysis. To the best of our knowledge, this is the first reported case in Malaysia.

    CASE PRESENTATION: 78-year-old lady who presented with life-threatening hemoptysis leading rapidly to cardiac arrest upon arrival. Spontaneous circulation was restored after resuscitation with an urgent thoracic computed tomography angiogram revealed bleeding likely from the posterior basal segment of left lower lobe, with bronchiectatic changes. Urgent flexible bronchoscopy revealed airway flooding, with bleeding originating from the lingular and posterior-basal segment of the left lower lobe. Airway toileting was performed and two 7 mm Endobronchial Watanabe Spigots were plugged into the culprit bronchi. Urgent bronchial artery embolization was then attempted, but was unsuccessful. She was managed conservatively, as surgical resection was deemed high risk. The spigots were removed 4 days later uneventfully. There was no recurrence of hemoptysis, and patient remained well during 1-month follow up.

    CONCLUSIONS: The utmost priority in managing life-threatening hemoptysis is to prevent airway flooding. Endobronchial embolization with Endobronchial Watanabe Spigot is useful as a temporary measure before definitive therapy, or can itself be the main therapeutic player in the hemoptysis armament for high-risk patients.

  4. Kho SS, Chan SK, Yong MC, Tie ST
    ERJ Open Res, 2019 Oct;5(4).
    PMID: 31649952 DOI: 10.1183/23120541.00135-2019
    Background: Radial endobronchial ultrasound (R-EBUS) is an effective technique in the diagnosis of peripheral pulmonary lesions (PPL). However, lesion orientation with regards to the radial probe remains an important factor for effective biopsy. "Within" orientation was associated with significantly higher diagnostic yield. Cryobiopsy is a novel technique in obtaining larger tissue samples with the frozen tip allowing biopsy in a 360° direction, thus potentially achieving more effective biopsy in eccentrically and adjacently orientated lesions. We aimed to evaluate the performance and safety of transbronchial cryobiopsy versus forceps biopsy in eccentrically and adjacently orientated R-EBUS lesions.

    Methods: Retrospective review of R-EBUS transbronchial biopsy for PPL over 17 months.

    Results: 114 R-EBUS scans were included for analysis during the study period. Forceps biopsy was performed in 76 (66.7%) cases and cryobiopsy in 38 (33.3%) cases. Baseline demographics and lesion characteristics did not differ between the two groups. Median (interquartile range) lesion size was 3.48 (2.63-4.51) cm. Overall, 41.2% of lesions were of eccentric orientation and 15.8% adjacent orientation; only 43% were concentric in orientation. Overall diagnostic yield was 67.5% (77 out of 114). Orientation remained an important factor affecting diagnostic yield. Transbronchial cryobiopsy significantly increased the diagnostic yield in eccentrically and adjacently orientated lesions to 75.0% (18 out of 24), compared to 48.8% (20 out of 41) obtained via forceps biopsy (p<0.05); but not in concentric lesions. Cryobiopsy was associated with more mild and moderate bleeding complications compared to the forceps biopsy group.

    Conclusions: Transbronchial cryobiopsy under R-EBUS guidance is a safe procedure which potentially increases diagnostic yield in eccentrically and adjacently orientated PPLs.

  5. Kho SS, Chan SK, Yong MC, Tie ST
    Med J Malaysia, 2018 02;73(1):49-50.
    PMID: 29531204 MyJurnal
    Tuberculous pleural effusion (TBE) is a common encounter in our region. Up to 50% of patients with TBE will develop residual pleural thickening (RPT) which can lead to functional impairment. However, the need of drainage remains controversial. We report a case of end-stage renal failure patient who presented with right multiloculated tuberculous pleural effusion which was drained via a medical thoracoscope. Patient reports immediate relief of breathlessness post procedure and one month follow up shown significant improvement of RPT. We also discussed the current perspective on the rationale of TBE drainage and the role of medical thoracoscope in TBE management.
  6. Kho SS, Tie ST, Chan SK, Yong MC, Chai SL, Voon PJ
    Respirol Case Rep, 2017 May;5(3):e00221.
    PMID: 28250931 DOI: 10.1002/rcr2.221
    Chylothorax is defined as the presence of chyle in the pleural cavity. Central vein thrombosis is an under-recognized cause of chylothorax in the adult population and is commonly related to central venous catheterization. Case 1 illustrates a patient with AIDS and disseminated tuberculosis with left chylothorax and central vein thrombosis after a month of antituberculosis therapy. Case 2 was a patient with advanced seminoma who presented with left chylothorax and central vein thrombosis while on chemotherapy. Chylothorax resolved with anticoagulation for both cases. Case 3 was a lymphoma patient with central vein thrombosis who developed chylothorax during chemotherapy. Chylothorax resolved with the continuation of anticoagulation and did not recur despite his progressive underlying lymphoma. There was no central venous catheterization in any of these three cases. These cases illustrate the unique association of central vein thrombosis and chylothorax and the importance of anticoagulation in its management.
  7. Kho SS, Yong MC, Chan SK, Tie ST, Voon PJ
    Med J Malaysia, 2018 12;73(6):403-404.
    PMID: 30647213
    Malignant central airway obstruction (CAO) with ball valve effect (BVE) in the lung is rare. We discuss a case of metastatic colon cancer who presented with asthma like symptoms which thoracic computed tomography and bronchoscopy revealed an intraluminal tumour obstructing the left main bronchus in a ball valve manner. Airway patency was restored urgently with immediate alleviation of symptoms. This illustrates the importance of recognizing subtle features of central airway obstruction to allow expedition of appropriate investigations and therapy.
  8. Koh KT, Teh CL, Cheah CK, Ling GR, Yong MC, Hong HC, et al.
    Reumatismo, 2016 Sep 09;68(2):90-6.
    PMID: 27608797 DOI: 10.4081/reumatismo.2016.872
    The objective of this study was to compare the tolerability of methotrexate in two different regimes of folic acid (FA) supplementation in rheumatoid arthritis (RA). We performed a multicenter, cross-sectional observational cohort study on 240 RA patients with 120 patients each in 5 mg of FA weekly and 30 mg of FA weekly supplementation. There were no significant differences for side effects (14.2 versus 22.5%, P=0.523) and discontinuation of methotrexate (3.6 versus 13.3%, P=0.085). RA patients given 5 mg of FA weekly supplementation had a lower disease activity score 28 compared to 30 mg of FA weekly supplementation [3.44 (1.10) versus 3.85 (1.40), P=0.014]. FA supplementation of 5 mg per week and 30 mg per week was associated with similar tolerability of methotrexate in RA patients.
  9. Kho SS, Chan SK, Yong MC, Cheah HM, Lee YG, Tie ST
    Respir Investig, 2020 Sep;58(5):367-375.
    PMID: 32107195 DOI: 10.1016/j.resinv.2020.01.004
    BACKGROUND: Tuberculous pleural effusions (TBEs) and parapneumonic pleural effusion (PPEs) have similar clinical presentations and fluid biochemistry. A pleural biopsy is usually required to diagnose TBE but complete fluid evacuation may not be necessary, contrasting with complicated PPE (CPPE). A point-of-care test that distinguishes between TBE and CPPE enables the appropriate procedures to be performed during the initial diagnostic thoracentesis. Lactate is a metabolic product measurable by a blood-gas analyzer. This study measured pleural fluid (Pf) lactate levels in TBE and compared them with those in PPE/CPPE. We hypothesized that Pf lactate would be significantly higher in PPE because of active metabolic activities than in TBE which is driven by delayed hypersensitivity.

    METHODS: All patients undergoing an initial diagnostic thoracentesis over 18 months with Pf lactate measured using a calibrated point-of-care blood gas analyzer were assessed.

    RESULTS: The diagnoses of the enrolled patients (n = 170) included TBE (n = 49), PPE (n = 47), malignancy (n = 63), and transudate (n = 11). Pf lactate level in TBE, median 3.70 (inter-quartile range 2.65-4.90) mmol/l, was significantly lower than in PPE and CPPE. In the subgroup of TBE and CPPE patients whose initial Pf pH and glucose could suggest either condition, Pf lactate was significantly higher in those with CPPE. Pf lactate (cutoff ≥7.25 mmol/l) had a sensitivity of 79.3%, specificity 100%, positive predictive value 100%, and negative predictive value 89.1% for discriminating CPPE from TBE (area under the curve 0.947, p 

  10. Ngu NH, Chai CS, Chan SK, Kho SS, Yong MC, Tie ST
    Med J Malaysia, 2022 Nov;77(6):650-654.
    PMID: 36448380
    INTRODUCTION: Corticosteroids, particularly methylprednisolone, are part of the treatment for severe COVID-19 with acute respiratory distress syndrome (ARDS). In this study, we aimed to compare the mortalities of patients treated with higher versus lower doses of methylprednisolone. Secondary outcomes included oxygenation, need for mechanical ventilation, length of stay in intensive care unit (ICU), secondary infection, improvement of PaO2/FiO2 (PF) ratio, and inflammatory response as expressed by C-reactive protein (CRP).

    MATERIALS AND METHODS: A retrospective cohort study conducted at Sarawak General Hospital from 1st June to 30th September 2021. Patients who received intravenous methylprednisolone for severe COVID-19 in the ICU were identified and divided into two groups: higher dose (cumulative dose more than 10 mg per kg) and lower dose (cumulative dose less than 10 mg per kg).

    RESULTS: Out of a total of 165 patients, 40 (24.2%) patients received higher dose methylprednisolone. There was no significant difference in socio-demographic characteristics (age, gender, body mass index), COVID-19 vaccination status, laboratory parameters (lymphocyte count, CRP, lactate dehydrogenase, D-dimer), or usage of immunomodulator therapy between the groups. Overall mortality was 23.6%. Mortality in the higher dose group was twice as high compared to lower dose group (37.5% versus 19.2%) (OR 3.79, 95% CI 1.24-11.59, p<0.05). In addition, the higher dose cohort developed more secondary infections (87.5%) and had longer stays in ICU (median 11 days, IQR 8- 15). No significant difference was found between both cohorts in terms of CRP reduction, improvement of PF ratio, or the need for mechanical ventilation post methylprednisolone.

    CONCLUSION: In this study, the use of higher dose methylprednisolone in COVID-19 with ARDS was not associated with better clinical outcomes. A lower dose of methylprednisolone might be sufficient in treating severe COVID-19 with ARDS.

  11. Ho YH, Lim CT, Albart SA, Schee JP, Yong MC, Looi I
    Med J Malaysia, 2023 Jan;78(1):1-6.
    PMID: 36715183
    INTRODUCTION: Tuberculosis (TB) in Malaysia has estimated incidence and mortality rates of 81 cases per 100,000 people-year and 4.9 per 100,000 populations, respectively. This study aimed to study the characteristics of rural TB patients and their mortality outcomes.

    MATERIALS AND METHODS: This is a retrospective observational study involving real-world data analysis, looking into TB patients in Lubok Antu Health Clinic by obtaining data through clinic cards, from 1 January 2019 till 31 December 2020. Statistical significance was p < 0.05.

    RESULTS: Eighty-four patients were included. Fifty-two (61.9%) were male. Median age was 58.5 (39-67). Forty-six (54.8%) had smear-positive TB. Seventy-eight (92.9%) were alive at treatment completion. Fifteen (17.9%) experienced adverse drug reactions. Estimated prevalence and mortality rate were 7.1% and 10.7 per 100,000 populations, respectively. Regression analyses revealed that drug reaction was significantly associated with compliance [OR = 8.38 (95% CI: 1.26, 55.53), p = 0.029]. Patients compliant with treatment were more likely to survive [OR = 12.5 (95% CI: 1.61, 97.34), p = 0.028].

    CONCLUSION: Compliance with TB treatment should be emphasised to reduce TB-related mortality.

  12. Loh HH, Lim QH, Kang WH, Yee A, Yong MC, Sukor N
    Hormones (Athens), 2023 Dec;22(4):563-580.
    PMID: 37704922 DOI: 10.1007/s42000-023-00481-3
    PURPOSE  : Obstructive sleep apnea (OSA) is a chronic, sleep-related breathing disorder which leads to increased cardiovascular risks. Vitamin D deficiency is associated with various cardiometabolic complications, including increased cardiovascular morbidity and mortality. We aimed to analyze the difference in serum 25-hydroxyvitamin D (25-OHD) level, prevalence of vitamin D insufficiency and deficiency, and the effect of CPAP treatment on serum 25-OHD levels among adult patients with OSA.

    METHODS: We pooled data from 18 observational studies involving 5592 individuals. Baseline parameters that might have contributed to the significant differences observed were also analyzed.

    RESULTS: Patients with OSA had significantly lower serum 25-OHD levels (pooled d +  - 0.74 [95% CI: - 1.19 to - 0.28], p 

  13. Kho SS, Chai CS, Ho RL, Yong MC, Chan SK, Tie ST
    J Bronchology Interv Pulmonol, 2024 Jan 01;31(1):90-92.
    PMID: 37735753 DOI: 10.1097/LBR.0000000000000946
  14. Chai CS, Chan SK, Kho SS, Yong MC, Tie ST
    Respirol Case Rep, 2020 Jul;8(5):e00562.
    PMID: 32313656 DOI: 10.1002/rcr2.562
    Bronchopleural fistula (BPF) can complicate necrotizing pneumonia. Surgery would be indicated in patients who fail conservative management, yet this group is often of poor pulmonary function and general condition. Bronchial occlusion with endobronchial Watanabe spigots (EWS) can be a potential alternative treatment when the culprit bronchi can be isolated. In this case report, we describe a middle-aged gentleman who presented with necrotizing pneumonia complicated with pyopneumothorax with right upper lobe BPF, and who had failed to respond to chest drainage and antibiotics. EWS bronchial occlusion finally led to cessation of air leak, allowing removal of chest tube. EWS were removed uneventfully six months later. This case highlights the role of EWS in the management of BPF in patients with high surgical risk.
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