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A review of smell and taste dysfunction in COVID-19 patients

Wong DKC, Gendeh HS, Thong HK, Lum SG, Gendeh BS, Saim A, et al.

Med J Malaysia, 2020 09;75(5):574-581.
PMID: 32918429

INTRODUCTION: Multiple anecdotal reports suggest that smell and taste loss were early subclinical symptoms of COVID-19 patients. The objective of this review was to identify the incidence of smell and taste dysfunction in COVID-19, determine the onset of their symptoms and the risk factors of anosmia, hyposmia, ageusia or dysgeusia for COVID-19 infection.
METHODS: We searched the PubMed and Google Scholar on 15th May 2020, with search terms including SARS-COV-2, coronavirus, COVID-19, hyposmia, anosmia, ageusia and dysgeusia. The articles included were cross sectional studies, observational studies and retrospective or prospective audits, letters to editor and short communications that included a study of a cohort of patients. Case reports, case-series and interventional studies were excluded.
DISCUSSION: A total of 16 studies were selected. Incidence of smell and taste dysfunction was higher in Europe (34 to 86%), North America (19 to 71%) and the Middle East (36 to 98%) when compared to the Asian cohorts (11 to 15%) in COVID-19 positive patients. Incidence of smell and taste dysfunction in COVID-19 negative patients was low in comparison (12 to 27%). Total incidence of smell and taste dysfunction from COVID-19 positive and negative patients from seven studies was 20% and 10% respectively. Symptoms may appear just before, concomitantly, or immediately after the onset of the usual symptoms. Occurs predominantly in females. When occurring immediately after the onset of the usual symptoms, the median time of onset was 3.3 to 4.4 days. Symptoms persist for a period of seven to 14 days. Patients with smell and taste dysfunction were reported to have a six to ten-fold odds of having COVID-19.
CONCLUSION: Smell and taste dysfunction has a high incidence in Europe, North America, and the Middle East. The incidence was lower in the Asia region. It is a strong risk factor for COVID-19. It may be the only symptom and should be added to the list of symptoms when screening for COVID- 19.
Fulltext A ten year retrospective review of orbital complications secondary to acute sinusitis in children

Suhaili DN, Goh BS, Gendeh BS

Med J Malaysia, 2010 Mar;65(1):49-52.
PMID: 21265249 MyJurnal

Acute sinusitis is most often a mild self-limiting disease. However, it may progress into severe and life threatening complications. One of the commonest being orbital complication of which visual loss is a direct consequence. In this 10 year retrospective study, the nature of orbital complication, clinical presentation and treatment modalities and outcome seen in children with acute sinusitis in a tertiary referral institute were reviewed. Of six patients, there was a case of preseptal cellulitis, 4 cases of subperiosteal abscess and one case of orbital abscess. Periorbital swelling was a common presenting feature. In 5 cases this was associated with proptosis with one case of impending optic nerve compression. The value of computed tomography and opthalmological examination as a component in the management plan is highlighted. All patients were treated with intravenous antibiotics but evidence of abscess collection warranted urgent surgical drainage in 5 patients, 3 being endoscopic drainage while external approach was done for the remaining 2 patients. Thus a child exhibiting orbital complication of acute sinusitis, prompt diagnosis and treatment is essential in obtaining the best outcome for the child.
Fulltext Acquired nasal posterior choanal atresia: postradiotherapy

Marina MB, Gendeh BS

Med J Malaysia, 2006 Mar;61(1):94-6.
PMID: 16708742

Reported cases of acquired posterior choanal atresia are very few in the English literature. A case of acquired posterior choanal atresia post radiotherapy is reported which was treated by endonasal endoscopic repair using microdebrider with untoward effect.
Adenoid cystic carcinoma of the sinonasal tract: outcome of endonasal endoscopic surgery at five-year follow up

Gendeh BS, Zahedi FD, Ahmad H, Kew TY

J Laryngol Otol, 2013 May;127(5):511-5.
PMID: 23570560 DOI: 10.1017/S0022215113000480

To study the outcome of endonasal endoscopic surgery for adenoid cystic carcinoma of the sinonasal tract over a five-year follow-up period.
An improved instrument mounting arm

Gendeh BS, Khalid BA, Alberti PW

J Laryngol Otol, 2001 Feb;115(2):126-7.
PMID: 11320829

Although some form of commercial instrument mounting arm is available, a paucity of information in the literature may cause problems in selecting the most appropriate model for an ENT department wishing to trial their invention for use in the clinic or operating theatre. The instrument mounting arm described here is based on existing designs used by hobbyists and model makers for many years but the main benefit of this innovation is its multi-purpose use in the operating theatre and cost effectiveness since it is made of aluminum alloy. It is compact, stable and easily adjustable and can incorporate an endoscope holder or an operating end piece to mount various ENT instruments that offers considerable advantages to the unassisted operator.
Antrochoanal polyps: clinical presentation and the role of powered endoscopic polypectomy

Gendeh BS, Long YT, Misiran K

Asian J Surg, 2004 Jan;27(1):22-5.
PMID: 14719510

Antrochoanal polyps are a rare clinical entity. In this review of patients treated between January 1996 and September 2002, there were 18 cases of antrochoanal polyps. The mean age of patients was 20 years. Nasal obstruction was the most common symptom (17 cases, 94%), followed by rhinorrhoea (44%), epistaxis (33%), postnasal drip (28%), and snoring (22%). Chronic sinus was the most common associated rhinological finding (50%). Various surgical approaches were used: endoscopic polypectomy and middle meatal antrostomy in seven patients (38.9%), endoscopic polypectomy and inferior meatal antrostomy in three patients (16.7%) and Caldwell-Luc surgery in one patient (5.6%). No complications were noted in patients treated with powered instrumentation, including the three patients in whom combined transcanine approaches were used. We concluded that powered endoscopic polypectomy was safe and effective. It allowed a more complete dissection and may diminish the chance of recurrence.
Fulltext Atopic sensitization of children with rhinitis in Malaysia

Gendeh BS, Mujahid SH, Murad S, Rizal M

Med J Malaysia, 2004 Oct;59(4):522-9.
PMID: 15779586 MyJurnal

Atopy is defined as the genetic propensity to develop immunoglobulin E antibodies in response to exposure to allergens and assessed by skin prick test (SPT) responses to common allergens, which may contribute to the development of the clinical disorders (phenotype). Although it is generally agreed that atopy is an important risk factor for allergic diseases such as asthma, rhinitis, and eczema, the extent to which atopy accounts for these diseases is controversial. One hundred forty one children (up to 12 years) were skin prick tested to evaluate 16 foods common to the Malaysian diet and 4 common aeroallergens. Eighty-five percent of patients had positive SPT reactivity. The most commonly implicated aeroallergen and food allergen was house dust mite (HDM) and Prawn. Seventy percent had positive SPT reactivity results to HDM and 24.8% to prawns. Fifty five percent were positive to more than one allergen and 17.7% positive to single aeroallergen. The prevalence of atopy in children with history of eczema was 90%. The incidence of HDM and food allergy especially crabs and prawns, is significantly greater in Malaysian Children with rhinitis symptoms.
Bilateral internal jugular vein ectasia: a report of two cases

Gendeh BS, Dhillon MK, Hamzah M

J Laryngol Otol, 1994 Mar;108(3):256-60.
PMID: 8169515

Internal jugular vein ectasia is a venous anomaly commonly presenting as a unilateral neck swelling in children and adults. Literature reports of bilateral presentation are rare. Bilateral Doppler ultrasonography is the diagnostic investigation of choice. The possible pathology, aetiology and management are discussed. Conservative management of bilateral cases is recommended in uncomplicated cases.
Fulltext Bilateral maxillary sinus cholesterol granuloma: a rare entity

Marina MB, Gendeh BS

Med J Malaysia, 2006 Jun;61(2):226-8.
PMID: 16898317

Cholesterol granuloma in the paranasal sinuses is rare. It is more common in the mastoid antrum and temporal bone air cells in chronic middle ear disease. A case of bilateral maxillary sinus cholesterol granuloma that mimics chronic maxillary sinusitis is reported. This is the first reported case of cholesterol granuloma of the maxillary sinus in the Malaysian Literature.
Fulltext Challenges in the treatment of sinonasal undifferentiated carcinoma: a ray of hope

Norleza AN, Gendeh BS

Med J Malaysia, 2005 Aug;60(3):281-5.
PMID: 16379180 MyJurnal

We studied nine cases of SNUCs presented to the Department of Otorhinolaryngology, Hospital University Kebangsaan Malaysia from 1999 to 2003. There were 8 males and 1 female with ages ranging from 24 to 78 years (mean 46.5y). The racial distribution consisted of 5 Chinese (55.5%), 3 Malays (33.3%) and 1 Indian (11.1%). Three patients were Kadish B (33.3%) and six were Kadish C (66.6%) by classification. In our series 2 years survival was 26.3% and median survival time was 14.2 months.
Fulltext Clinical study of graft selection in malaysian rhinoplasty patients

Gendeh BS

ISRN Otolaryngol, 2013;2013:639643.
PMID: 24078883 DOI: 10.1155/2013/639643

Graft selection remains the greatest challenge for surgeons performing rhinoplasty. The preferred choice thus far for nasal reconstruction would be autograft compared to allograft due to its lower rate of infection and extrusion as it does not induce an immune response. We have evaluated 26 patients who underwent open structured rhinoplasty at our center and compared our experience regarding the operative technique, graft availability, indications, and limitations. The racial distribution was 18 Indians, 5 Chinese, and 3 Malays with a mean age, hospitalization, and followup of 30.5 years, 16.9 months, and 4.4 days, respectively. Majority of the patients (57.6%) presented with twisted nose and 30.7% of the patients presented with history of nasal trauma. All the patients had deviated septum of varying severity. The most common graft used was quadrangular cartilage graft and the common complications noted were ala deformity and tip anaesthesia in 7.6% patients respectively.
Fulltext Conventional versus endoscopic inferior turbinate reduction: technique and results

Gendeh BS

Med J Malaysia, 2000 Sep;55(3):357-62.
PMID: 11200717

Different modalities of turbinate reduction procedures are available for treatment of vasomotor rhinitis not responding to appropriate medical therapy. Amongst these, conventional inferior turbinectomy (non-endoscopic) is the most widely performed procedure. With the advent of nasal endoscopes, inferior turbinoplasty has been gaining popularity worldwide. The purpose of this study was to compare the post-operative complaints and hospital stay of conventional versus endoscopic inferior turbinate reduction techniques performed non-randomly on 15 and 21 patients of vasomotor rhinitis respectively from January 1998 to December 1999 at Hospital Universiti Kebangsaan Malaysia (HUKM). A total of 36 patients (22 males and 14 females) with a mean age of 30.6 years underwent turbinate reduction procedures during this period with a post-operative follow up ranging from 3 months to 6.7 months (mean 3.8 months). There was a significant difference between the conventional and the endoscopic technique with regards to nasal discomfort (p = 0.05) and dry throat (p = 0.02) which was less severe when performed endoscopically. The average hospital stay in hours by the endoscopic technique was almost half compared to the conventional technique. Due to the improved visualisation and minimal post-operative complaints and reduced hospital stay, the technique of endoscopic inferior turbinoplasty is currently the procedure of choice at our center. In septoplasty when endoscopic instrument is not needed, the standard turbinate reduction procedure is still performed. The availability of pre and post-operative acoustic rhinomanometric evaluation will be helpful as an objective measurement of nasal symptoms in the near future.
Fulltext Correlation of computed tomography and nasal endoscopic findings in chronic rhinosinusitis

Shahizon AM, Suraya A, Rozmnan Z, Aini AA, Gendeh BS

Med J Malaysia, 2008 Aug;63(3):211-5.
PMID: 19248692 MyJurnal

This is a cross sectional study of 40 patients diagnosed with chronic rhinosinusitis using the Lanza Kennedy diagnostic criteria based on nasal endoscopy (NE), and on computer tomography (CT) of the paranasal sinuses. The purpose of the study is to demonstrate the effectiveness and limitations of CT, and NE in the assessment of chronic rhinosinusitis. This study shows that CT was superior in detecting OMC involvement, presence of concha bullosa, paradoxical turbinate and nasal septal deviation. NE was better at detecting polyps.
Fulltext Cultural Adaptation of Sniffin' Sticks Smell Identification Test: The Malaysian Version

Sai-Guan L, Husain S, Zahedi FD, Ahmad N, Gendeh BS

Iran J Otorhinolaryngol, 2020 Jul;32(111):213-222.
PMID: 32850509 DOI: 10.22038/ijorl.2019.34346.2138

Introduction: Sniffin' Sticks smell identification test is a tool used for evaluation of olfactory function but the results are culture-dependent. It relies on the subject's familiarity to the odorant and descriptors. This study aims to develop the Malaysian version of Sniffin' Sticks smell identification test suitable for local population usage.
Materials and Methods: The odorant descriptors and distractors of the original version of Sniffin' Sticks were translated into Malay language. It was then tested for familiarity and identifiability in 30 normosmic subjects. The descriptors were replaced until the familiarity of all descriptors and identification rates of odorants achieved ≥ 70%. The validity of the new cultural-adapted version was tested in 60 hypo-anosmic subjects and 60 normosmic subjects with Student t-test. The test-retest reliability was evaluated after two weeks with interclass correlation.
Results: Two odorant descriptors and nine distractors achieved familiarity <70% (13.3% - 66.7%) and were replaced. Another three culturally inappropriate distractors were also replaced. The mean score among the healthy subjects was significantly higher than the subject with smell dysfunction [13.7 (1.12) and 7.3 (3.42); t = 7.24 (df = 34.23), P<0.001]. The coefficient of correlation (r) between test and retest scores was 0.93 (P<0.001).
Conclusion: The cultural adapted Malaysian version of Sniffin' Sticks smell identification test is valid and has high test-retest reliability. This is the first smell identification test validated in Malaysia. It is effective for evaluation of olfactory function in local population.
Diabetes insipidus and syndrome of inappropriate antidiuretic hormone complicating pituitary surgery

Aboud SK, Yunus MR, Gendeh BS

Otolaryngol Head Neck Surg, 2011 Jun;144(6):1005-6.
PMID: 21493376 DOI: 10.1177/0194599810390899
Fulltext Ectopic Esthesioneuroblastoma of the Sphenoclivus: A Rare Entity

Zahedi FD, Gendeh BS, Husain S, Kumar R, Kew TY

Indian J Otolaryngol Head Neck Surg, 2017 Mar;69(1):125-129.
PMID: 28239593 DOI: 10.1007/s12070-016-0978-0

Esthesioneuroblastoma is a rare malignant neoplasm of oflactory neuroepithelium and usually located at the olfactory cleft at superior nasal cavity. Ectopic localization of esthesioneuroblastoma is even rarer and usually posed with a diagnostic dilemma and delay in the diagnosis and management, We report a rare case of ectopic esthesioneuroblastoma of the sphenoclivus with the presentation of intermittent unilateral epistaxis, intermittent intractable headache without anosmia. Nasal endoscopy findings showed a pulsatile mass at the anterior face of the sphenoid sinus with extension posteriorly towards the clivus region and occupying the floor of the sphenoid sinus. Endonasal transclival endoscopic excision of tumour was performed which involved otorhinolaryngology surgeon and neurosurgeon with intraoperative navigation imaging and frozen section. The histopathological findings was esthesioneuroblastoma. Due to its rarity and unusual presentation, the diagnosis of ectopic esthesioneuroblastoma is difficult and can be misdiagnosed with the other type of malignancy. Therefore, the histopathological result is important in confirming the type of tumour and can lead to the next step of management.
Fulltext Efficacy of mometasone furoate and fluticasone furoate on persistent allergic rhinoconjunctivitis

Aneeza WH, Husain S, Rahman RA, Van Dort D, Abdullah A, Gendeh BS

Allergy Rhinol (Providence), 2013;4(3):e120-6.
PMID: 24498516 DOI: 10.2500/ar.2013.4.0065

Allergic rhinoconjunctivitis denotes both nasal and ocular manifestation of allergy, which may be solely treated with intranasal steroid. This study compares the efficacy of mometasone furoate nasal spray (NS) and fluticasone furoate NS in treatment of allergic rhinoconjunctivitis. The secondary objective is to study the severity of baseline ocular symptoms in allergic rhinoconjunctivitis. Seventy-eight patients with allergic rhinoconjunctivitis were assessed subjectively and objectively using twice-daily symptom scores for nasal (reflective total nasal symptom score [rTNSS] and instantaneous TNSS [iTNSS]) and ocular (reflective total ocular symptom score [rTOSS] and instantaneous TOSS [iTOSS]) symptoms, rhinoconjunctivitis quality-of-life questionnaires (RQOLQs), and acoustic rhinometry. All measurements were taken at baseline and at 4 and 8 weeks of treatment. Sixty-three patients who were randomized into the mometasone furoate group (n = 36) and the fluticasone furoate group (n = 27) completed the study. Seventy-six percent of patients had mild ocular symptoms, 20.5% had moderate symptoms, and only 2.6% had severe symptoms at baseline based on the iTOSS; 65.1% had mild nasal symptoms and 3% had severe nasal symptoms. There was significant reduction in the symptom scores after 1 week (p < 0.05). Both groups had significant improvement in RQOLQ scores after 1 month, which further improved at 2 months (p < 0.05). The nasal dimensions also improved in both groups (p < 0.05) but there was no statistically significant difference between groups. Both mometasone furoate and fluticasone furoate are effective as single-modality treatment of allergic rhinoconjunctivitis. The majority of patients manifest mild ocular symptoms that may be solely treated with intranasal steroids.
Fulltext Empty nose syndrome post radical turbinate surgery

Iqbal FR, Gendeh BS

Med J Malaysia, 2007 Oct;62(4):341-2.
PMID: 18551943 MyJurnal

Empty Nose Syndrome (ENS) is a rare and controversial sequelae from previous radical turbinate surgery. We report on a 50-year-old Chinese gentleman with long-standing nasal problems who has had radical turbinate surgery many years prior to presenting at the ENT clinic with mucoid nasal discharge and chronically blocked nose. His nasal cavities were ironically very patent and there were only minor remnants of his turbinates bilaterally. We treated him medically for several years with nasal steroids, antihistamines and leukotriene receptor antagonists and his nasal symptoms have reduced significantly.
Study site: ENT clinic, Pusat Perubatan Universiti Kebangsaan Malaysia (PPUKM), Kuala Lumpur, Malaysia
Endonasal endoscopic repair of anterior skull-base fistulas: the Kuala Lumpur experience

Gendeh BS, Mazita A, Selladurai BM, Jegan T, Jeevanan J, Misiran K

J Laryngol Otol, 2005 Nov;119(11):866-74.
PMID: 16354338

The purpose of this retrospective study is to determine the pattern of cerebrospinal fluid (CSF) rhinorrhoea presenting to our tertiary referral centre in Kuala Lumpur and to assess the clinical outcomes of endonasal endoscopic surgery for repair of anterior skull base fistulas. Sixteen patients were treated between 1998 and 2004. The aetiology of the condition was spontaneous in seven and acquired in nine patients. In the acquired category, three patients had accidental trauma and this was iatrogenic in six patients (five post pituitary surgery), with one post endoscopic sinus surgery (ESS). Imaging included computed tomography (CT) scan and magnetic resonance imaging (MRI). Endoscopic repair is less suited for defects in the frontal sinuses with prominent lateral extension and defects greater than 1.5 cm in diameter involving the skull base. Fascia lata, middle turbinate mucosa, nasal perichondrium and ear fat ('bath plug') were the preferred repair materials in the anterior skull base, whereas fascia lata, cartilage and abdominal fat obliteration was preferentially used in the sphenoid leak repair. Intrathecal sodium flourescein helped to confirm the site of CSF fistula in 81.3 per cent of the patients. Ninety per cent of the patients who underwent 'bath plug' repair were successful. The overall success rate for a primary endoscopic procedure was 87.5 per cent, although in two cases a second endoscopic procedure was required for closure. In the majority of cases endoscopic repair was successful, and this avoids many of the complications associated with craniotomy, particularly in a young population. Therefore it is our preferred option, but an alternative procedure should be utilized should this prove necessary.
Fulltext Endonasal endoscopic transsphenoidal pituitary surgery for pituitary adenoma: a retrospective analysis of surgical outcome

Sand MS, Gendeh BS, Husain S

Med J Malaysia, 2011 Dec;66(5):443-6.
PMID: 22390098 MyJurnal

The purpose of this retrospective joint rhino-neurosurgical study from January 1998 until September 2009 is to document the demographic data, clinical presentations, radiological findings, approaches and incidence of residual tumour. Forty-seven patients with pituitary adenoma underwent trans-sphenoidal hypophysectomy of which 25 patients with complete medical and radiological data were included in the study. The medical and radiological data were analyzed. There were 12 males and 13 females with age ranging from 17 to 76 years old (mean 49.2). Fourteen of the patients were Chinese, eight Malays and three Indians. Twelve of the patients had functioning tumour of which five each presented with acromegaly and Cushing disease respectively and two with amenorrhoea. The rest of 13 patients had non functioning tumour presenting with visual disturbances. Sixteen of the patients had pituitary macroadenomas and the rest 9 microadenomas. Eighteen patients had undergone transcollumellar trans-sphenoidal hypophysectomy and the rest 7 patients had undergone transnasal transsphenoidal hypophysectomy. About 68.8% of pituitary macroadenomas had residual tumour, compared to only 22.2% of patient with pituitary microadenomas. Radiologically, about 45.5% of residual macroadenoma had suprasellar extension and the majority had spread to suprasellar cistern and carvenous sinus (54.5%). About 16.6% of patients had undergone post operative radiotherapy. In conclusion, this study showed that patient with pituitary macroadenomas had higher incidence of residual tumour compared to pituitary microadenomas.

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