Displaying publications 41 - 52 of 52 in total

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  1. Teh D, Mohamad NF, Lim E, Zulkiflee AB, Narayanan P, Kamalden TA
    Comput Assist Surg (Abingdon), 2016 Dec;21(1):25-28.
    PMID: 27973957
    Foreign bodies lodged in the intraconal space of the orbit pose a surgical challenge due to its deep location behind the globe. Image-guided endoscopic transnasal surgery facilitates the localization of the metallic foreign bodies and enables its safe removal with minimal surrounding tissue damage and optic nerve injury.
  2. Sukumaran Y, Pol Ong Y, Siow Ping L, Ong CA, Narayanan P
    Cureus, 2023 Jul;15(7):e42296.
    PMID: 37609079 DOI: 10.7759/cureus.42296
    Neuroendocrine neoplasms (NEN) of the head and neck are a rare and diverse group of tumors. Here, we report a case of a 40-year-old man presenting with symptoms resembling chronic left otitis media, including left ear otorrhea, otalgia, and reduced hearing. Otoscopic examination revealed a whitish mass located behind the tympanic membrane. The patient underwent examination under anesthesia and left cortical mastoidectomy, and a histopathological examination of the middle ear biopsy indicated the presence of an epithelial tumor with neuroendocrine differentiation, suggestive of middle ear adenoma. A staging CT scan performed three months after the mastoidectomy showed a hypodensity in the middle ear cavity, with no significant bony erosion, which could potentially indicate a residual or recurrent tumor. Consequently, a radical mastoidectomy was performed. The histopathological examination confirmed the presence of middle ear adenoma with neuroendocrine differentiation.
  3. Jegathesan Y, Stephen PP, Sati ISEE, Narayanan P, Monif M, Kamarudin MNA
    Biomed Pharmacother, 2024 Mar;172:116277.
    PMID: 38377734 DOI: 10.1016/j.biopha.2024.116277
    Notorious for its high mortality rate, the current standard treatment for high-grade gliomas remains a challenge. This is largely due to the complex heterogeneity of the tumour coupled with dysregulated molecular mechanisms leading to the development of drug resistance. In recent years, microRNAs (miRNAs) have been considered to provide important information about the pathogenesis and prognostication of gliomas. miRNAs have been shown to play a specific role in promoting oncogenesis and regulating resistance to anti-glioma therapeutic agents through diverse cellular mechanisms. These include regulation of apoptosis, alterations in drug efflux pathways, enhanced activation of oncogenic signalling pathways, Epithelial-Mesenchymal Transition-like process (EMT-like) and a few others. With this knowledge, upregulation or inhibition of selected miRNAs can be used to directly affect drug resistance in glioma cells. Moreover, the clinical use of miRNAs in glioma management is becoming increasingly valuable. This comprehensive review delves into the role of miRNAs in drug resistance in high-grade gliomas and underscores their clinical significance. Our analysis has identified a distinct cluster of oncogenic miRNAs (miR-9, miR-21, miR-26a, miR-125b, and miR-221/222) and tumour suppressive miRNAs (miR-29, miR-23, miR-34a-5p, miR 181b-5p, miR-16-5p, and miR-20a) that consistently emerge as key players in regulating drug resistance across various studies. These miRNAs have demonstrated significant clinical relevance in the context of resistance to anti-glioma therapies. Additionally, the clinical significance of miRNA analysis is emphasised, including their potential to serve as clinical biomarkers for diagnosing, staging, evaluating prognosis, and assessing treatment response in gliomas.
  4. Ab Rahim NAC, Liew YT, Ghauth S, Narayanan P, Abu Bakar Z
    Indian J Otolaryngol Head Neck Surg, 2023 Jun;75(2):347-351.
    PMID: 36406798 DOI: 10.1007/s12070-022-03261-4
    The purpose of this study was to conduct a cadaveric dissection study on the anatomical variation of the sublingual (SLG) excretory ducts and dictate an improved understanding of the anatomical communication between the SLG duct and submandibular (SMG) ducts. This study is carried out by standardized dissection of anterior floor of mouth in 6 formalin-fixed adult cadavers in Silent Mentor Workshop University Malaya in August 2020. The cadavers had no trace of scars, adhesions, signs of trauma or operation. SMG duct opening was identified lateral to the lingual frenulum through a papilla in the floor of mouth behind the lower incisor tooth. A horizontal incision line was done over floor of mouth just lateral to the opening. SMG duct and SLG was traced and skeletonized. Any presence of major duct arising from the SLG and its communication with SMG duct were investigated. We found there are 3 patterns of SLG excretory duct variants; (1) One major (Bartholin's) duct which open independently at its own orifice adjacent to the orifice of the Wharton's duct of SMG. (2) One major (Bartholin's) duct which joined into the Wharton's duct of SMG. (3) Absent of a major duct arising from SLG. The overall mean diameter of SLG ducts were 1.3 ± 0.41 and the mean length of SLG ducts were 18.5 ± 6.55. The overall mean diameter of SMG ducts was 2.6 ± 0.74 and the mean length of SMG ducts were 46.5 ± 6.57. Excretory ductal system of SLG showed great variations, not only between the different cadavers but also within the different sides of the same cadaver. Awareness of potential anatomical variations can aid in the accurate diagnosis and treatment of patients with salivary gland pathology as well as help surgeons reveal potential risk factor and avoid complications during surgical procedures in the floor of mouth.
  5. Lim CC, Liew YT, Ghauth S, Bakar MZBA, Narayanan P
    Indian J Otolaryngol Head Neck Surg, 2023 Jun;75(2):1255-1258.
    PMID: 37274994 DOI: 10.1007/s12070-022-03192-0
    Methylene blue has many usages in the field of otolaryngology. We describe a preliminary finding of methylene blue guided neopharynx closure after total laryngectomy. This technique can potentially reduce the risk of pharyngocutaneous fistula and has not been described in the literature. It is also handy in assisting junior surgeons to perform modified Connell suture during neopharynx reconstruction. Concurrently, we reviewed other essential applications of methylene blue in otolaryngology.
  6. Tang IP, Ngui LX, Ramachandran K, Lim LY, Voon PJ, Yu KL, et al.
    Eur Arch Otorhinolaryngol, 2019 Sep;276(9):2475-2482.
    PMID: 31227870 DOI: 10.1007/s00405-019-05522-5
    PURPOSE: To study the surgical and oncological outcomes of endoscopic endonasal transpterygoid nasopharyngectomy (EETN) in salvaging locally recurrent nasopharyngeal carcinoma (NPC).

    METHOD: This was a retrospective clinical record review study carried out at a tertiary centre from June 2013 until May 2017. A total of 55 locally recurrent NPC patients (rT1-rT4) underwent EETN performed by single skull base surgeon with curative intention with postoperative adjuvant chemotherapy but without postoperative radiotherapy.

    RESULTS: There were 44 (80.0%) males and 11 (20.0%) females, with mean age of 52.5 years. The mean operating time was 180 min (range 150-280 min). 85% (47/55) of patients achieved en bloc tumour resection. 93% (51/55) of patients obtained negative microscopic margin based on postoperative histopathological evaluation. Intraoperatively, one (1.8%) patient had internal carotid artery injury which was successfully stented and had recovered fully without neurological deficit. There were no major postoperative complications reported. During a mean follow-up period of 18-month (range 12-48 months) postsurgery, five patients (9.1%) had residual or recurrence at the primary site. All five patients underwent re-surgery. One patient at rT3 passed away 6 months after re-surgery due to distant metastasis complicated with septicaemia. The 1-year local disease-free rate was 93% and the 1-year overall survival rate was 98%.

    CONCLUSIONS: EETN is emerging treatment options for locally recurrent NPC, with relatively low morbidity and encouraging short-term outcome. Long-term outcome is yet to be determined with longer follow-up and bigger cohort study. However, a successful surgical outcome required a very experienced team and highly specialised equipment.

  7. Ramasamy P, Kumarasamy V, Singh ASM, Abu Bakar MZB, Narayanan P, Ganapathy SS, et al.
    Obes Surg, 2021 08;31(8):3749-3757.
    PMID: 34046825 DOI: 10.1007/s11695-021-05492-w
    PURPOSE: The effect of altered subsphincteric gastric volume and pressure after bariatric surgery on laryngopharyngeal reflux (LPR) remains largely unknown. This was a cross-sectional pilot study conducted between January 2018 and January 2019 to identify changes in LPR symptoms and signs in bariatric surgery patients presurgery and postsurgery.

    MATERIALS AND METHODS: Thirty-four patients listed for bariatric surgery in a single tertiary referral center were recruited, where 31 (77.4% female, mean age 46.3 ± 8.9 years) fulfilled the eligibility criteria. Of the eligible patients, 54.8% and 45.2% underwent sleeve gastrectomy (SG) and gastric bypass (GB), respectively. LPR symptoms were assessed using the self-reported reflux symptom index (RSI). Video-recorded endolaryngeal signs were scored using the reflux finding score (RFS) by two blinded otolaryngologists. Patients' presurgical and 3-month postsurgical body mass index (BMI), RSI, and RFS were determined. Patients were deemed as having LPR when RSI > 13 or RFS > 7.

    RESULTS: There was a significant correlation between the postsurgical RSI and RFS changes (Pearson's r = 0.474, p = 0.007). Of the 31 patients, 12.9% (RSI) and 6.4% (RFS) recovered from preexisting LPR, whereas 22.6% (RSI) and 3.2% (RFS) developed new de novo LPR postsurgery. The postsurgical mean RFS change improved significantly in the GB group compared with that of the SG group (p < 0.05).

    CONCLUSION: LPR is best assessed clinically using a multimodal approach (RSI and RFS). Bariatric surgery may worsen or lead to de novo LPR. Recognizing the LPR outcomes in these patients is paramount for optimal voice, speech, and swallowing functions.

  8. Lim CC, Ahmad TEBTN, Sawali HB, Afandi ANB, Paniselvam V, Bernard MW, et al.
    Eur Arch Otorhinolaryngol, 2023 May;280(5):2201-2207.
    PMID: 36350365 DOI: 10.1007/s00405-022-07711-1
    OBJECTIVES: Obstructive sleep apnea (OSA) has been associated with auditory dysfunction both to the cochlear and higher auditory pathways. However, available literatures presented conflicting results. We aimed to study the impact of OSA severity and their polysomnography parameters on hearing function.

    MATERIALS AND METHODS: A total of 44 patients were included after evaluation for sleep disorders and were divided into four groups in accordance with apnea-hypopnea index (AHI). Pure tone audiometry (PTA), distortion product otoacoustic emission (DPOAE) and auditory brainstem response (ABR) were compared in commensurate with the severity of AHI. Polysomnography oximetry parameters of oxygen desaturation index, mean SPO2, minimum SPO2 and percent SPO2 

  9. Rampal S, Maniam S, Lim PY, Ramachandran R, Tan EK, Halim MAHA, et al.
    Int Orthop, 2021 06;45(6):1399-1405.
    PMID: 33484294 DOI: 10.1007/s00264-020-04905-2
    PURPOSE: Necrotizing fasciitis (NF) is a rapidly progressive inflammatory infection of the fascia, with secondary necrosis of the subcutaneous tissues. The severity of the disease depends on the virulence of the organism and host immunity. There is a paucity of reports on the prevalence of NF causing pathogens and management.

    METHODS: Retrospective data of patients treated for NF were collected from two tertiary care hospitals in Central Malaysia between January 2014 and December 2018.

    RESULTS: A total of 469 NF patients were identified. More than half of the NF patients were males (n = 278; 59.28%). The highest number of cases was found among age groups between 30 and 79, with mean age of 56.17. The majority of the NF cases (n = 402; 85.72%) were monomicrobial. Streptococcus spp. (n = 89; 18.98%), Pseudomonas aeruginosa (n = 63; 13.44%) and Staphylococcus spp. (n = 61; 13.01%) were identified as the top three microorganisms isolated. Among the 469 NF cases, 173 (36.8%) were amputated or dead while 296 (63.1%) recovered. Proteus spp. (n = 19; 12.93%), Klebsiella pneumoniae (n = 18; 12.24%) and Escherichia coli (n = 14; 9.52%) were associated with all types of amputations. The most common antibiotic prescribed was unasyn (n = 284; 60.56%), followed by clindamycin (n = 56; 11.94%) and ceftazidime (n = 41; 8.74%). A total of 239 (61.8%) recovered while 148 (38.2%) were either amputated or dead when managed with the unasyn, clindamycin or ceftazidime.

    CONCLUSION: This study represents the largest NF cases series in Malaysia highlighting the causative agents and management.

  10. Katelaris CH, Lai CK, Rhee CS, Lee SH, Yun WD, Lim-Varona L, et al.
    Am J Rhinol Allergy, 2011 Sep-Oct;25 Suppl 1:S3-15.
    PMID: 22185687 DOI: 10.2500/ajra.2011.25.3674
    The Allergies in Asia-Pacific Survey describes the symptoms, impact, and treatment of allergic rhinitis (AR) across Australia, China, Hong Kong, Malaysia, Singapore, Taiwan, Vietnam, and the Philippines. The Allergies in Asia-Pacific Survey was undertaken to further clarify the prevalence of physician-diagnosed nasal allergies (NAs), impact on quality-of-life (QOL), existing treatment paradigms and gaps, and NA medications currently used in treatment.
  11. Ong LM, Narayanan P, Goh HK, Manocha AB, Ghazali A, Omar M, et al.
    Nephrology (Carlton), 2013 Mar;18(3):194-200.
    PMID: 23311404 DOI: 10.1111/nep.12029
    The objective of the study was to compare the efficacy and safety of oral paricalcitol with oral calcitriol for treating secondary hyperparathyroidism.
  12. Schee JP, Ang CL, Crystal Teoh SC, Tan HJ, Chew SH, Steven A, et al.
    Med J Malaysia, 2023 Sep;78(5):594-601.
    PMID: 37775485
    INTRODUCTION: Intravenous thrombolysis (IVT) with recombinant tissue plasminogen activator is beneficial in acute ischaemic stroke (AIS). We aim to compare the realworld clinical outcomes and service efficiency of IVT in Malaysian primary stroke centres (PSCs) versus acute stroke ready hospitals (ASRHs).

    MATERIALS AND METHODS: We conducted a multi-centre cohort study involving 5 PSCs and 7 ASRHs in Malaysia. Through review of medical records of AIS patients who received IVT from 01 January 2014 to 30 June 2021, real-world data was extracted for analysis. Univariate and multivariate regression models were employed to evaluate the role of PSCs versus ASRHs in post-IVT outcomes and complications. Statistical significance was set at p<0.05.

    RESULTS: A total of 313 multi-ethnic Asians, namely 231 from PSCs and 82 from ASRHs, were included. Both groups were comparable in baseline demographic, clinical, and stroke characteristics. The efficiency of IVT delivery (door-toneedle time), functional outcomes (mRS at 3 months post- IVT), and rates of adverse events (intracranial haemorrhages and mortality) following IVT were comparable between the 2 groups. Notably, 46.8% and 48.8% of patients in PSCs and ASRHs group respectively (p=0.752) achieved favourable functional outcome (mRS≤1 at 3 months post-IVT). Regression analyses demonstrated that post-IVT functional outcomes and adverse events were independent of the role of PSCs or ASRHs.

    CONCLUSION: Our study provides real-world evidence which suggests that IVT can be equally safe, effective, and efficiently delivered in ASRHs. This may encourage the establishment of more ASRHs to extend the benefits of IVT to a greater proportion of stroke populations and enhance the regional stroke care.

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