Displaying publications 21 - 34 of 34 in total

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  1. Lim CC, Liew YT, Ghauth S, Narayanan P
    Turk Arch Otorhinolaryngol, 2024 Jul 03;62(1):33-37.
    PMID: 39257051 DOI: 10.4274/tao.2024.2023-12-15
    Endoscopic transoral excision of parapharyngeal space (PPS) tumors is often condemned for its many limitations. We revisit this approach and aim to introduce some updated perspectives following the advancement of endoscopic instrumentation, robotic transoral surgery, and radical tonsillectomy. We illustrate the techniques that were deployed for six patients with huge benign PPS tumors originating from the pre-styloid compartment at our center. Only patients who had a tumor size of five cm or larger were included in this study. We summarized our patients' outcomes, the important considerations, and the advantages and disadvantages of this approach. With accurate selection and surgical strategy, all our patients had good clinical outcomes. We demonstrated that even larger tumors can be safely removed endoscopically. Surely, this approach will gain traction, and better-designed studies should be conducted in the future to assess its credibility.
  2. Narayanan V, Narayanan P, Rajagopalan R, Karuppiah R, Rahman ZA, Wormald PJ, et al.
    Eur Arch Otorhinolaryngol, 2015 Mar;272(3):753-7.
    PMID: 25294050 DOI: 10.1007/s00405-014-3300-3
    Endoscopic base of skull surgery has been growing in acceptance in the recent past due to improvements in visualisation and micro instrumentation as well as the surgical maturing of early endoscopic skull base practitioners. Unfortunately, these demanding procedures have a steep learning curve. A physical simulation that is able to reproduce the complex anatomy of the anterior skull base provides very useful means of learning the necessary skills in a safe and effective environment. This paper aims to assess the ease of learning endoscopic skull base exposure and drilling techniques using an anatomically accurate physical model with a pre-existing pathology (i.e., basilar invagination) created from actual patient data. Five models of a patient with platy-basia and basilar invagination were created from the original MRI and CT imaging data of a patient. The models were used as part of a training workshop for ENT surgeons with varying degrees of experience in endoscopic base of skull surgery, from trainees to experienced consultants. The surgeons were given a list of key steps to achieve in exposing and drilling the skull base using the simulation model. They were then asked to list the level of difficulty of learning these steps using the model. The participants found the models suitable for learning registration, navigation and skull base drilling techniques. All participants also found the deep structures to be accurately represented spatially as confirmed by the navigation system. These models allow structured simulation to be conducted in a workshop environment where surgeons and trainees can practice to perform complex procedures in a controlled fashion under the supervision of experts.
  3. Lim EY, Tang IP, Peyman M, Ramli N, Narayanan P, Rajagopalan R
    Eur Arch Otorhinolaryngol, 2015 Nov;272(11):3109-13.
    PMID: 25205300 DOI: 10.1007/s00405-014-3232-y
    High acoustic noise level is one of the unavoidable side effects of 3 T magnetic resonance imaging (MRI). A case of hearing loss after 3 T MRI has been reported in this institution and hence this study. The objective of this study was to determine whether temporary threshold shift (TTS) in high frequency hearing occurs in patients undergoing 3 T MRI scans of the head and neck. A total of 35 patients undergoing head and neck 3 T MRI for various clinical indications were tested with pure tone audiometry in different frequencies including high frequencies, before and after the MRI scan. Any threshold change from the recorded baseline of 10 dB was considered significant. All patients were fitted with foamed 3 M earplugs before the procedure following the safety guidelines for 3 T MRI. The mean time for MRI procedure was 1,672 s (range 1,040-2,810). The noise dose received by each patient amounted to an average of 3,906.29% (1,415-9,170%). The noise dose was derived from a normograph used by Occupational Noise Surveys. This was calculated using the nomograph of L eq, L EX, noise dose and time. There was no statistically significant difference between the hearing threshold before and after the MRI procedures for all the frequencies (paired t test, P > 0.05). For patients using 3 M foamed earplugs, noise level generated by 3 T MRI during routine clinical sequence did not cause any TTS in high frequency hearing.
  4. Manuel AM, Kalimuthu S, Pathmanathan SS, Narayanan P, Zainal Abidin Z, Azmi K, et al.
    Asian J Surg, 2017 Apr;40(2):158-162.
    PMID: 24210537 DOI: 10.1016/j.asjsur.2013.09.011
    Arteriovenous malformations are congenital lesions that may evolve with time and manifest in a plethora of presentations. They can occur as torrential epistaxis when it extensively involves the facial region. Multi-imaging modalities are available to assist in characterizing the structure of the lesion as well as its location and extent. This complex disease requires a multidisciplinary team approach with preoperative embolization and surgery. We present a rare cause of life-threatening epistaxis in a gentleman with a longstanding orbital and hemifacial arteriovenous malformation and discuss the complexities involved in its management.
  5. Hwang CF, Chen Y, Lin HC, Narayanan P, Oh SH, Truy E
    Biomed Res Int, 2015;2015:683967.
    PMID: 26240825 DOI: 10.1155/2015/683967
  6. 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.
  7. Lim CC, Ghauth S, Liew YT, Bakar MZBA, Narayanan PAL
    Eur Arch Otorhinolaryngol, 2023 Feb;280(2):925-927.
    PMID: 36592173 DOI: 10.1007/s00405-022-07808-7
    BACKGROUND: Sarcoidosis is a granulomatous disorder involving multi-systemic organs. Patients invariably have lung involvement but some may have extrapulmonary disease. Rarely, cervical lymphadenopathy is the only sign without mediastinal or pulmonary abnormalities.

    CASE PRESENTATION: We report a Malay male who complained of neck swelling exclusively. On imaging, multiple enlarged cervical lymph nodes deep to the sternocleidomastoid muscle were seen. An excision biopsy revealed non-caseating granulomas with epithelioid macrophages. Extensive investigations led to the diagnosis of isolated cervical lymph node sarcoidosis.

    CONCLUSIONS: Sarcoidosis can present as cervical lymphadenopathy alone, without mediastinal or lung disease. The presence of epithelioid granulomas on histopathology warrants the exclusion of other granulomatous diseases. Isolated cervical lymph node sarcoidosis is only diagnosed in the presence of consistent clinical and radiological findings. In this case, close monitoring for systemic sarcoidosis is important as it can manifest later in life.

  8. 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.
  9. 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.
  10. 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.
  11. 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.

  12. 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.

  13. 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 

  14. 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.
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