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Fulltext An Aubergine in My … Case of Rectal Foreign Body

Mohamad IS, Yaacob H

Malays Fam Physician, 2018;13(3):47-48.
PMID: 30800236 MyJurnal

A 24-year-old man presented to the casualty department with a history of left-sided, colicky abdominal pain for one day. It was associated with an inability to pass flatus or motion within the same duration. There was no history of vomiting. On examination, the vital signs were within normal limits, and he was afebrile. His abdomen was soft, but a hard mass was palpable on the left side of his abdomen. There was no peritonitis. The bowel sounds were sluggish.
Fulltext Single rare central lesion with triple common aerodigestive symptoms

Mohamad I, Mohamad IS, Nik Hassan N

Malays Fam Physician, 2018;13(1):57-58.
PMID: 29796215 MyJurnal

An elderly gentleman with a known history of
well-controlled hypertension presented with
a three-week history of hoarseness associated
with mild breathlessness. There was no episode
of cyanosis, no noisy breathing, and no
reduction in effort tolerance. There was also no
history of chest pain or orthopnea. He denied
any feeling of food stuck in his throat or chest,
and he had no history of choking sensations
during meals. He, however, was unable to
count from 1 to 10 in one breath, and lung
auscultation revealed reduced air entry on both
sides. A chest radiograph was then obtained. (Copied from article).
Fulltext Use of aerosol protective barrier in a patient with impending cholangitis and unknown COVID-19 status undergoing emergency ERCP during COVID-19 pandemic

Leow VM, Mohamad IS, Subramaniam M

BMJ Case Rep, 2020 Jul 16;13(7).
PMID: 32675132 DOI: 10.1136/bcr-2020-236918

WHO declared worldwide outbreak of COVID-19 a pandemic on 11 March 2020. Healthcare authorities have temporarily stopped all elective surgical and endoscopy procedures. Nevertheless, there is a subset of patients who require emergency treatment such as aerosol-generating procedures. Herein, we would like to discuss the management of a patient diagnosed with impending biliary sepsis during COVID-19 outbreak. The highlight of the discussion is mainly concerning the advantages of concurrent use of aerosol protective barrier in addition to personal protective equipment practice, necessary precautions to be taken during endoscopy retrograde cholangiopancreatography and handling of the patient preprocedure and postprocedure.
Biliary ascariasis - A vicious cycle

Che Husin N, Mohamad IS, Ho KY, Soh JY, Syed Aziz SH, Zakaria Z

Malays Fam Physician, 2021 Jul 22;16(2):83-85.
PMID: 34386170 DOI: 10.51866/cr1078

Biliary ascariasis is a rare disease in a non-endemic area. However, it is one of the possible etiological factors for retarded growth as well as malnutrition in children. It may cause intestinal obstruction, appendicitis, biliary obstruction, liver abscess, hepatolithiasis, and pancreatitis in adults. Herein, we report a patient with ascending cholangitis secondary to biliary ascariasis who was successfully managed with Endoscopic Retrograde Cholangio Pancreaticography.
Fulltext Elucidating the Effects of Interconnecting Layer Thickness and Bandgap Variations on the Performance of Monolithic Perovskite/Silicon Tandem Solar Cell by wxAMPS

Mohamad IS, Doroody C, Alkharasani WM, Norizan MN, Chelvanathan P, Shahahmadi SA, et al.

Materials (Basel), 2023 May 31;16(11).
PMID: 37297240 DOI: 10.3390/ma16114106

In this study, we investigated the pathways for integration of perovskite and silicon solar cells through variation of the properties of the interconnecting layer (ICL). The user-friendly computer simulation software wxAMPS was used to conduct the investigation. The simulation started with numerical inspection of the individual single junction sub-cell, and this was followed by performing an electrical and optical evaluation of monolithic 2T tandem PSC/Si, with variation of the thickness and bandgap of the interconnecting layer. The electrical performance of the monolithic crystalline silicon and CH3NH3PbI3 perovskite tandem configuration was observed to be the best with the insertion of a 50 nm thick (Eg ≥ 2.25 eV) interconnecting layer, which directly contributed to the optimum optical absorption coverage. These design parameters improved the optical absorption and current matching, while also enhancing the electrical performance of the tandem solar cell, which benefited the photovoltaic aspects through lowering the parasitic loss.
Fulltext Optoelectrical Properties of Treated CdSe Thin Films with Variations in Indium Chloride Concentration

Nisham Rosly H, Doroody C, Harif MN, Mohamad IS, Isah M, Amin N

Materials (Basel), 2023 May 31;16(11).
PMID: 37297242 DOI: 10.3390/ma16114108

The effect of a nontoxic chloride treatment on the crystallinity and optoelectrical characteristics of a CdSe thin film was studied. A detailed comparative analysis was conducted utilizing four molarities (0.01 M, 0.10 M, 0.15 M, and 0.20 M) of indium (III) chloride (InCl3), where the results showed a notable improvement in CdSe properties. The crystallite size of treated CdSe samples increased from 31.845 nm to 38.819 nm, and the strain in treated films dropped from 4.9 × 10-3 to 4.0 × 10-3, according to XRD measurements. The highest crystallinity resulted from the 0.10 M InCl3-treated CdSe films. The In contents in the prepared samples were verified by compositional analysis, and FESEM images from treated CdSe thin films demonstrated compact and optimal grain arrangements with passivated grain boundaries, which are required for the development of a robust operational solar cell. The UV-Vis plot, similarly, showed that the samples were darkened after treatment and the band gap of 1.7 eV for the as-grown samples fell to roughly 1.5 eV. Furthermore, the Hall effect results suggested that the carrier concentration increased by one order of magnitude for samples treated with 0.10 M of InCl3, but the resistivity remained in the order of 103 ohm/cm2, suggesting that the indium treatment had no considerable effect on resistivity. Hence, despite the deficit in the optical results, samples treated at 0.10 M InCl3 showed promising characteristics as well as the viability of treatment with 0.10 M InCl3 as an alternative to standard CdCl2 treatment.
Fulltext Biliary ascariasis: extraction

Rahimi M, Mohamad IS, Yahya MM, Mohammad Azmi MAF, Voon Meng L

Endoscopy, 2024 Dec;56(S 01):E195-E196.
PMID: 38388953 DOI: 10.1055/a-2258-8436
Fulltext The Influence of Reaction Time on Non-Covalent Functionalisation of P3HT/MWCNT Nanocomposites

Nurazzi NM, Abdullah N, Demon SZN, Halim NA, Mohamad IS

Polymers (Basel), 2021 Jun 09;13(12).
PMID: 34207577 DOI: 10.3390/polym13121916

Non-covalent functionalisation of the carbon nanotube (CNT) sidewall through polymer wrapping is the key strategy for improving well-dispersed CNTs without persistent alteration of their electronic properties. In this work, the effect of reaction time on regioregular poly (3-hexylthiophene-2,5-diyl) (P3HT)-wrapped hydroxylated multi-walled CNT (MWCNT-OH) nanocomposites was investigated. Five different reaction times (24, 48, 72, 96, and 120 h) were conducted at room temperature in order to clearly determine the factors that influenced the quality of wrapped MWCNT-OH. Morphological analysis using Field Emission Scanning Electron Microscopic (FESEM) and High-Resolution Transmission Electron Microscope (HRTEM) analysis showed that P3HT successfully wrapped the MWCNT-OH sidewall, evidenced by the changes in the mean diameter size of the nanocomposites. Results obtained from Raman spectroscopy, X-ray Photoelectron Spectroscopy (XPS) as well as Thermogravimetric Analysis (TGA) showed a significant effect of the wrapped polymer on the CNT sidewall as the reaction time increased. Overall, the method used during the preparation of P3HT-wrapped MWCNT-OH and the presented results significantly provided a bottom-up approach to determine the effect of different reaction times on polymer wrapping to further expand this material for novel applications, especially chemical sensors.
Fulltext Surface-Oxidised Carbon Nanofibre-Based Nanofluids: Structural, Morphological, Stability and Thermal Properties

Mohd Saidi N, Abdullah N, Norizan MN, Janudin N, Mohd Kasim NA, Osman MJ, et al.

Nanomaterials (Basel), 2022 Nov 07;12(21).
PMID: 36364698 DOI: 10.3390/nano12213922

The reputation of nanofluids as a convenient heat transfer media has grown in recent years. The synthesis of nanofluids is often challenging, particularly carbon-based nanofluids, due to the rapid agglomeration of the nanoparticles and the instability of the nanofluids. In this regard, surface modification and surfactant addition are potential approaches to improve the physical and thermal properties of carbon-based nanofluids that have been studied and the structural, morphological, and thermal characteristics of surface-oxidised carbon nanofibre (CNF)-based nanofluids has been characterised. Commercial CNF was first subjected to three different acid treatments to introduce surface oxygen functional groups on the CNF surface. Following the physical and thermal characterisation of the three surface-oxidised CNFs (CNF-MA, CNF-MB, and CNF-MC), including Raman spectroscopy, Fourier transform infrared (FTIR), thermogravimetric analysis (TGA), and field emission scanning electron microscopy (FESEM), the CNF-MB was selected as the best method to synthesise the surface-oxidised CNF-based nanofluid. A total of 40 mL of ultrapure water was used as a pure base fluid and mixed with the surface-oxidised CNF at a concentration range of 0.1-1.0 wt.%, with a fixed of 10 wt.% amount of polyvinylpyrrolidone (PVP). The thermal conductivity of CNF-based nanofluid was then characterised at different temperatures (6, 25, and 40 °C). Based on the results, surface oxidation via Method B significantly affected the extent of surface defects and effectively enhanced the group functionality on the CNF surface. Aside from the partially defective and rough surface of CNF-MB surfaces from the FESEM analysis, the presence of surface oxygen functional groups on the CNF wall was confirmed via the Raman analysis, TGA curve, and FTIR analysis. The visual sedimentation observation also showed that the surface-oxidised CNF particles remained dispersed in the nanofluid due to the weakened van der Waals interaction. The dispersion of CNF particles was improved by the presence of PVP, which further stabilised the CNF-based nanofluids. Ultimately, the thermal conductivity of the surface-oxidised CNF-based nanofluid with PVP was significantly improved with the highest enhancement percentage of 18.50, 16.84, and 19.83% at 6, 25, and 40 °C, respectively, at an optimum CNF concentration of 0.7 wt.%.
Correction: Carbon nanotubes: functionalisation and their application in chemical sensors

Norizan MN, Moklis MH, Ngah Demon SZ, Halim NA, Samsuri A, Mohamad IS, et al.

RSC Adv, 2024 Mar 20;14(14):9570.
PMID: 38516155 DOI: 10.1039/d4ra90025a

[This corrects the article DOI: 10.1039/D0RA09438B.].
Fulltext Carbon nanotubes: functionalisation and their application in chemical sensors

Norizan MN, Moklis MH, Ngah Demon SZ, Halim NA, Samsuri A, Mohamad IS, et al.

RSC Adv, 2020 Nov 27;10(71):43704-43732.
PMID: 35519676 DOI: 10.1039/d0ra09438b

Carbon nanotubes (CNTs) have been recognised as a promising material in a wide range of applications, from safety to energy-related devices. However, poor solubility in aqueous and organic solvents has hindered the utilisation and applications of carbon nanotubes. As studies progressed, the methodology for CNTs dispersion was established. The current state of research in CNTs either single wall or multiwall/polymer nanocomposites has been reviewed in context with the various types of functionalisation presently employed. Functionalised CNTs have been playing an increasingly central role in the research, development, and application of carbon nanotube-based nanomaterials and systems. The extremely high surface-to-volume ratio, geometry, and hollow structure of nanomaterials are ideal for the adsorption of gas molecules. This offers great potential applications, such as in gas sensor devices working at room temperature. Particularly, the advent of CNTs has fuelled the invention of CNT-based gas sensors which are very sensitive to the surrounding environment. The presence of O2, NH3, NO2 gases and many other chemicals and molecules can either donate or accept electrons, resulting in an alteration of the overall conductivity. Such properties make CNTs ideal for nano-scale gas-sensing materials. Conductive-based devices have already been demonstrated as gas sensors. However, CNTs still have certain limitations for gas sensor application, such as a long recovery time, limited gas detection, and weakness to humidity and other gases. Therefore, the nanocomposites of interest consisting of polymer and CNTs have received a great deal of attention for gas-sensing application due to higher sensitivity over a wide range of gas concentrations at room temperature compared to only using CNTs and the polymer of interest separately.
Fulltext Conversion rate and risk factors of conversion to open in laparoscopic appendicectomy

Pushpanathan NR, Hashim MNM, Zahari Z, Aziz SHSA, Zain WZW, Ramely R, et al.

Ann Coloproctol, 2022 Dec;38(6):409-414.
PMID: 34407370 DOI: 10.3393/ac.2020.00437.0062

PURPOSE: Laparoscopic appendicectomy (LA) has several advantages over conventional open appendicectomy (OA). However, about 5% to 10% of LA patients still need to be converted to open surgery. Identifying risk factors that contribute to conversion to OA allows for early identification of patients who may benefit from primary OA. This study aimed to determine the conversion rate of LA to OA and to identify its associated risk factors among patients with acute or perforated appendicitis.
METHODS: A retrospective review of medical records was performed among patients with acute or perforated appendicitis who underwent LA between December 2015 and January 2017. With the use of multivariable logistic regression analyses, the predictors of conversion from laparoscopic to OA were investigated.
RESULTS: Out of 120 patients, 33 cases were converted to OA which gives a conversion rate of 27.5%. Among 33 patients who were converted to OA, 27 patients (81.8%) had perforated appendix, while in the LA group, perforated appendix cases consisted of 34.5% (P<0.001). Histopathology of the appendix was the predictor of conversion from LA to OA (adjusted odds ratio, 8.82; 95% confidence interval, 3.13-24.91; P<0.001).
CONCLUSION: The result from our study shows that the overall conversion rate for the study period was high. Patients with perforated appendicitis had a higher risk of conversion to OA. Therefore, preoperative diagnosis of perforated appendicitis may be paramount in predicting conversion to OA.
Fulltext Comparing Low Volume Versus Conventional Volume of Polyethylene Glycol for Bowel Preparation during Colonoscopy: A Randomised Controlled Trial

Othman MF, Zakaria AD, Yahya MM, Md Hashim MN, Wan Mokhter WM, Wan Zain WZ, et al.

Malays J Med Sci, 2023 Oct;30(5):106-115.
PMID: 37928791 DOI: 10.21315/mjms2023.30.5.9

BACKGROUND: Polyethylene glycol (PEG) solution is widely used as a colonoscopic bowel cleaning agent, although some patients are intolerant due to the need for ingesting large solution volumes and unpleasant taste. A low-volume solution may enhance patient tolerability and compliance in bowel preparation. Accordingly, this study compared the effectiveness of two difference PEG volumes for bowel preparation before colonoscopy in terms of bowel cleanliness, completeness of colonoscopy, patient tolerability and colonoscopy duration.
METHODS: Using a prospective randomised controlled single-blinded study design, 164 patients scheduled for colonoscopy were allocated to two groups (n = 82 patients in each) to receive either the conventional PEG volume (3 L, control group) or the low volume (2 L, intervention group). The Boston Bowel Preparation Scale (BBPS), a validated scale for assessing bowel cleanliness during colonoscopy, was used to score bowel cleanliness in three colon segments. Secondarily, colonoscopy completeness, tolerability to drinking PEG and the duration of colonoscopy were compared between the groups.
RESULTS: There were no statistically significant differences between the two intervention groups in terms of bowel cleanliness (P = 0.119), colonoscopy completion (P = 0.535), tolerability (P = 0.190) or the amount of sedation/analgesia required (midazolam, P = 0.162; pethidine, P = 0.708). Only the duration of colonoscopy differed between the two groups (longer duration in the control group, P = 0.039).
CONCLUSION: Low-volume (2 L) PEG is as effective as the standard 3 L solution in bowel cleaning before colonoscopy; however, the superiority of either solution could not be established.

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