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Fulltext Comparison between LMA-Classic and AMBU AuraOnce laryngeal mask airway in patients undergoing elective general anaesthesia with positive pressure ventilation

Suzanna AB, Liu CY, Rozaidi SW, Ooi JS

Med J Malaysia, 2011 Oct;66(4):304-7.
PMID: 22299547

The LMA-Classic laryngeal mask airway (Classic LMA) is an autoclavable and reusable laryngeal mask airway with strong evidence supporting its efficacy and safety. Due to the concern of infection risk particularly of prion disease, various single-use laryngeal mask devices were developed. The Ambu AuraOnce LMA (Ambu LMA) is a single use disposable laryngeal mask airway with special design that conforms better to the anatomy of the airway.

Matched MeSH terms: Laryngeal Masks*
Fulltext A comparison between Laryngeal Tube Suction II Airway and Proseal Laryngeal Mask Airway in laparascopic surgery

Esa K, Azarinah I, Muhammad M, Helmi MA, Jaafar MZ

Med J Malaysia, 2011 Aug;66(3):182-6.
PMID: 22111436

This was a prospective randomized study comparing the ease of insertion, haemodynamic changes, quality of airway seal, oxygenation and ventilation parameters and complications between Laryngeal Tube Suction II (LTS II) with Proseal Laryngeal Mask Airway (PLMA), both are supraglottic airway incorporated with gastric passage. Fifty-four ASA I and II patients were randomly allocated to receive either LTS II or PLMA. Both devices provided a secure airway even under conditions of elevated intra-abdominal pressure up to 17 mmHg. In this study, there were no differences concerning ease of insertion, haemodynamic changes, quality of airway seal, oxygenation and ventilation parameters and complications between LTS II and PLMA.

Matched MeSH terms: Laryngeal Masks*
Fulltext Nitrous oxide pollution in the operating room. A comparison of two modes of ventilation

Noorddin Y, Raha AR, Jaafar MZ, Rozaidi SH, Muraly S, Marlizan MY

Med J Malaysia, 2007 Jun;62(2):127-9.
PMID: 18705444 MyJurnal

The use of laryngeal mask airway (LMA) as an alternative to the endotracheal tube (ETT) is becoming more popular in the practice of anesthesia. It is undeniable that this device has numerous advantages over endotracheal tube, however it does not provide an airtight seal between the airway and atmospheric gases. This may lead to pollution of the operating room environment with nitrous oxide. One hundreds adult patients undergoing general anaesthesia were divided into two groups. The airway in Group I was maintained with LMA with spontaneous ventilation and ETT with intermittent positive pressure ventilation (IPPV) was used for Group II. The result demonstrated that the ETT group recorded concentrations of nitrous oxide that were well above the NIOSH recommended eight hour time weighted average of 25ppm throughout the duration of surgery when compared to patients using LMA.

Matched MeSH terms: Laryngeal Masks*
Fulltext Comparison of the ease of insertion of the laryngeal tube VBM and laryngeal mask airway during manual in-line neck stabilization

Noor Zairul M, Khairul Faizi A, Norzalina E

Med J Malaysia, 2006 Jun;61(2):157-61.
PMID: 16898305

The purpose of this study is to assess whether the newly developed laryngeal tube (LT) VBM is easy, simple to use and able to provide adequate ventilation and oxygenation to a patient with an unstable neck who required airway management. We compared the LT to the laryngeal mask airway (LMA) as alternative airway management tool in adult patient with unstable neck who underwent intubation with manual in-line neck stabilization. A randomized single-blinded prospective study was conducted involving a total of 40 ASA I and II premedicated patients who were divided into two groups with 20 patients for each group; either LT or LMA group for airway management during elective surgery. After preoxygenation, anaesthesia was induced and neuromuscular blockade was produced with intravenous drugs. The LT or LMA was inserted after neuromuscular blockade was confirmed using a peripheral nerve stimulator (TOF 1). A size 3, 4 or 5 LT OR a size 3 or 4 LMA was inserted while the patient's head and neck were being stabilized by an assistant who held the sides of the neck and the mastoid processes (manual in-line stabilization). If it was not possible to ventilate the lungs, or if endotrachial carbon dioxide (ETCO2) and/or chest movement did not indicate a patent airway, the LT or LMA was removed. After three failed attempts, the study was terminated and the airway was secured in the most suitable manner determined by the anaesthetist. There was a statistically significant difference for both groups in the time required for successful insertion (time required for LT was 24.8 +/- 7.7 seconds and LMA was 36.1+/-17.3 seconds) (p= 0.01). There was no statistical differences (p>0.05) in number of attempts needed to achieve a patent airway although we were able to achieve a clear airway in all patients in LT group at the first attempt compared with 85% in LMA group. successful insertion rate was 100% for both groups. We conclude that the LT is easier to insert and is a suitable alternative to the LMA for airway management when the patient's head and neck are stabilized by manual in-line method.

Matched MeSH terms: Laryngeal Masks*
Fulltext Clearing the air about "the haze"

Jeyaindran S

Med J Malaysia, 2006 Mar;61(1):117-21.
PMID: 16708750

From the beginning of time, man has lived in a continuous state of interdependence with his environment. If the forces of nature are harnessed well, they are a source of great benefit to mankind, but when this balance is tipped, nature's backlash on man can be quite devastating. In recent times, we have seen many vivid examples of the magnitude of the destructive forces of nature, ranging from massive floods caused by typhoons such as Katrina and Rita, the hundreds of thousands of lives lost by the powerful tsunami and the destruction of the environment by the raging forest fires in Spain and California. Yet man has not learnt his lesson. Often greed, at times gross ignorance and more often than not, just indifference to the effects of his actions on the environment result in man upsetting his balance with the environment. In Malaysia, since 1990, the haze has become a predictable annual occurrence, varying only in its severity and duration. The cause being beyond our control, we are unable to prevent it from happening. However, it is within our means to be ready to take the necessary steps to minimize the effects of the haze on the health of Malaysians. In order to be able to give appropriate advice and to allay the anxiety of the general public, it is necessary to have a clear understanding about the various effects of haze on humans.

Matched MeSH terms: Masks
Fulltext Controlled ventilation with Brain laryngeal mask

Miranda AF, Reddy VG

Med J Malaysia, 1990 Mar;45(1):65-9.
PMID: 2152071

A Brain laryngeal mask was assessed in fifty patients undergoing general anaesthesia who required controlled ventilation. The mask was inserted in all patients without any difficulty and the satisfactory seal obtained enabled ventilation in all patients in a wide range of positions. Airway obstruction occurred in seven patients secondary to downfolding of the epiglottis and this was rectified by reinsertion. The incidence of sore throat was 10%. The Brain laryngeal mask is a safe alternative to the tracheal tube for controlled ventilation during general anaesthesia.

Matched MeSH terms: Masks*
Fulltext Optimal size selection of laryngeal mask airway in Malaysian female adult population

Rao AS, Yew AEG, Inbasegaran K

Med J Malaysia, 2003 Dec;58(5):717-22.
PMID: 15190658 MyJurnal

The summary of various studies done looking at size selection of the laryngeal mask airway (LMA) in adults is that, selection based on sex is appropriate, and that both sizes 4 or 5 are adequate for adult females. However, in our local population these sizes may be too large especially the size 5 for adult females.

Matched MeSH terms: Laryngeal Masks/standards*
How do surgeons weather the storm of COVID-19 pandemic?

Voon K, Premnath N

Med J Malaysia, 2020 11;75(6):762-763.
PMID: 33219197

COVID-19 has infected more than 10 million people worldwide and it has become one of the biggest challenges in the modern medical history. Wearing of face masks, social distancing, effective hand hygiene and the use of appropriate personal protective equipment are important in flattening the curve of the pandemic. The role of the surgeons in this battle against COVID-19 include curbing the spread of the disease, to protect and preserve the surgical workforce and to ensure the continuance of essential surgical services. We report our experience in dealing with the COVID-19 outbreak in a tertiary surgical centre in the Penang General Hospital in Northern Malaysia.

Matched MeSH terms: Masks/supply & distribution*
Fulltext Individual-Level Heterogeneity in Mask Wearing during the COVID-19 Pandemic in Malaysia

Zhang SX, Looi KH, Li N, Wan X, Li J

Am J Trop Med Hyg, 2021 Aug 09;105(6):1516-1518.
PMID: 34370702 DOI: 10.4269/ajtmh.21-0566

Wearing a face mask has been a key approach to contain or slow down the spread of COVID-19 in the ongoing pandemic. However, there is huge heterogeneity among individuals in their willingness to wear face masks during an epidemic. This research aims to investigate the individual heterogeneity to wear face masks and its associated predictors during the COVID-19 pandemic when mask-wearing was not mandatory. Based on a survey of 708 Malaysian adults and a multivariate least-squares fitting analysis, the results reveal a significant variance among individuals in wearing masks, as 34% of the individual adults did not always wear masks in public places. Female individuals, individuals who wash their hands more frequently, and those who reported more availability of personal protective equipment were more likely to practice mask-wearing. The identification of less-compliant groups of mask wearing has critical implications by enabling more specific health communication campaigns.

Matched MeSH terms: Masks*
Randomized clinical trial comparing helmet continuous positive airway pressure (hCPAP) to facemask continuous positive airway pressure (fCPAP) for the treatment of acute respiratory failure in the emergency department

Adi O, Via G, Salleh SH, Chuan TW, Rahman JA, Muhammad NAN, et al.

Am J Emerg Med, 2021 Nov;49:385-392.
PMID: 34271286 DOI: 10.1016/j.ajem.2021.06.031

STUDY OBJECTIVE: To determine whether non-invasive ventilation (NIV) delivered by helmet continuous positive airway pressure (hCPAP) is non-inferior to facemask continuous positive airway pressure (fCPAP) in patients with acute respiratory failure in the emergency department (ED).
METHODS: Non-inferiority randomized, clinical trial involving patients presenting with acute respiratory failure conducted in the ED of a local hospital. Participants were randomly allocated to receive either hCPAP or fCPAP as per the trial protocol. The primary endpoint was respiratory rate reduction. Secondary endpoints included discomfort, improvement in Dyspnea and Likert scales, heart rate reduction, arterial blood oxygenation, partial pressure of carbon dioxide (PaCO2), dryness of mucosa and intubation rate.
RESULTS: 224 patients were included and randomized (113 patients to hCPAP, 111 to fCPAP). Both techniques reduced respiratory rate (hCPAP: from 33.56 ± 3.07 to 25.43 ± 3.11 bpm and fCPAP: from 33.46 ± 3.35 to 27.01 ± 3.19 bpm), heart rate (hCPAP: from 114.76 ± 15.5 to 96.17 ± 16.50 bpm and fCPAP: from 115.07 ± 14.13 to 101.19 ± 16.92 bpm), and improved dyspnea measured by both the Visual Analogue Scale (hCPAP: from 16.36 ± 12.13 to 83.72 ± 12.91 and fCPAP: from 16.01 ± 11.76 to 76.62 ± 13.91) and the Likert scale. Both CPAP techniques improved arterial oxygenation (PaO2 from 67.72 ± 8.06 mmHg to 166.38 ± 30.17 mmHg in hCPAP and 68.99 ± 7.68 mmHg to 184.49 ± 36.38 mmHg in fCPAP) and the PaO2:FiO2 (Partial pressure of arterial oxygen: Fraction of inspired oxygen) ratio from 113.6 ± 13.4 to 273.4 ± 49.5 in hCPAP and 115.0 ± 12.9 to 307.7 ± 60.9 in fCPAP. The intubation rate was lower with hCPAP (4.4% for hCPAP versus 18% for fCPAP, absolute difference -13.6%, p = 0.003). Discomfort and dryness of mucosa were also lower with hCPAP.
CONCLUSION: In patients presenting to the ED with acute cardiogenic pulmonary edema or decompensated COPD, hCPAP was non-inferior to fCPAP and resulted in greater comfort levels and lower intubation rate.

Matched MeSH terms: Masks/standards*; Masks/statistics & numerical data
Challenging Conventional Paradigms in Applied Sports Biomechanics Research

Glazier PS, Mehdizadeh S

Sports Med, 2019 Feb;49(2):171-176.
PMID: 30511347 DOI: 10.1007/s40279-018-1030-1

This paper evaluates the effectiveness of, and highlights issues with, conventional paradigms in applied sports biomechanics research and comments on their capacity to optimise techniques of individual athletes. In empirical studies, group-based analyses often mask variability between athletes and only permit probabilistic 'in general' or 'on average' statements that may not be applicable to specific athletes. In individual-based analyses, performance parameters typically exhibit a small range and a flat response over iterative performance trials, making establishing associations between performance parameters and the performance criterion problematic. In theoretical studies, computer simulation modelling putatively enables athlete-specific optimum techniques to be identified, but given each athlete's unique intrinsic dynamics, it is far from certain that these optimum techniques will be attainable, particularly under the often intense psychological pressures of competition, irrespective of the volume of practice undertaken. Sports biomechanists and coaching practitioners are advised to be more circumspect with regard to interpreting the results of applied sports biomechanics research and have greater awareness of their assumptions and limitations, as inappropriate interpretation of results may have adverse consequences for performance and injury.

Matched MeSH terms: Masks
Fulltext Comparison of the VBM laryngeal tube and laryngeal mask airway for ventilation during manual in-line neck stabilisation

Noor Zairul M, Khairul Faizi A

Singapore Med J, 2006 Oct;47(10):892-6.
PMID: 16990966

INTRODUCTION: The purpose of this study is to assess whether the newly-developed VBM (Medizintechnik GmbH, Sulz, Germany) laryngeal tube (LT) is able to provide adequate ventilation and oxygenation to patients with an unstable neck and require airway management. The haemodynamic responses to insertion between the two devices were also studied. We compared the LT to the laryngeal mask airway (LMA) as an alternative airway management tool in adult patients with unstable neck and who underwent intubation with manual in-line neck stabilisation.
METHODS: A randomised single-blinded prospective study was conducted involving a total of 40 American Society of Anesthesiology I and II pre-medicated patients who were divided into two groups, LT or LMA, for airway management during elective surgery. There were 20 patients for each group. After pre-oxygenation, anaesthesia was induced using intravenous (i.v.) fentanyl and i.v. propofol. The neuromuscular blockade was produced with either i.v. vecuronium or i.v. atracurium. The LT or LMA was inserted after neuromuscular blockade was confirmed using a peripheral nerve stimulator (train-of-four 1). A size 3, 4 or 5 LT or a size 3 or 4 LMA was inserted while the patient's head and neck were being stabilised by an assistant who held the sides of the neck and the mastoid processes (manual in-line stabilisation). If it was not possible to ventilate the lungs, or if end-tidal carbon dioxide and/or chest movement did not indicate a patent airway, the LT or LMA was removed. After three failed attempts, the study was terminated and the airway was secured in the most suitable manner determined by the anaesthetist. After successful placement of LT or LMA, anaesthesia was maintained with 66 percent nitrous oxide in oxygen and 2 minimum alveolar concentration sevoflurane. All patients received standard anaesthesia monitoring. The ease of insertion, the number of attempts needed to successfully secure the airway, episodes of desaturation (less than 95 percent) and end-tidal carbon dioxide at various time intervals were studied. The haemodynamic parameters such as systolic blood pressure, diastolic blood pressure, mean arterial pressure and heart rate at different time intervals were also studied.
RESULTS: The study showed a statistically significant difference in time required for successful insertion between the groups; time required for LT was 24.8 +/- 7.7 seconds and LMA was 36.1 +/- 17.3 seconds (p-value equals 0.01). Both groups had no statistical differences (p-value is greater than 0.05) in number of attempts needed to achieve a patent airway, and the successful insertion rate was 100 percent for both groups. There were also no statistical differences in the haemodynamic response to insertion and the end-tidal carbon dioxide in this study.
CONCLUSION: We conclude that, under anaesthesia, the LT was a valuable and better alternative to LMA for ventilation and airway management when the patient's head and neck are stabilised by the manual in-line method.

Matched MeSH terms: Laryngeal Masks*
Fulltext Brain laryngeal mask--study in 50 spontaneously breathing patients

Reddy SV, Win N

Singapore Med J, 1990 Aug;31(4):338-40.
PMID: 2255930

Brain laryngeal mask (BLM) was used to assess its suitability in 50 spontaneously breathing patients by one lecturer and 4 Medical Officers. Insertion of the laryngeal mask was successful at the first attempt in 42 patients, second attempt in 7 and third attempt in one. The incidence of airway obstruction secondary to downfolding of the epiglottis, which was corrected by reinsertion, was 16%. Post-operative complications included clenching of teeth in 5 patients, vomiting in 2 and excessive salivation in 3. The incidence of sore throat was 10%.

Matched MeSH terms: Masks
Nanoscale patterning by AFM lithography and its application on the fabrication of silicon nanowire devices

Hutagalung SD, Kam CL, Darsono T

Sains Malaysiana, 2014;43:267-272.

Many techniques have been applied to fabricate nanostructures via top-down approach such as electron beam lithography. However, most of the techniques are very complicated and involves many process steps, high cost operation as well as the use of hazardous chemicals. Meanwhile, atomic force microscopy (AFM) lithography is a simple technique which is considered maskless and involves only an average cost and less complexity. In AFM lithography, the movement of a probe tip can be controlled to create nanoscale patterns on sample surface. For silicon nanowire (SiNW) fabrication, a conductive tip was operated in non-contact AFM mode to grow nanoscale oxide patterns on silicon-on-insulator (SOI) wafer surface based on local anodic oxidation (LAO) mechanism. The patterned structure was etched through two steps of wet etching processes. First, the TMAH was used as the etchant solution for Si removing. In the second step, diluted HF was used to remove oxide mask in order to produce a completed SiNW based devices. A SiNW based device which is formed by a nanowire channel, source and drain pads with lateral gate structures can be fabricated by well controlling the lithography process (applied tip voltage and writing speed) as well as the etching processes.

Matched MeSH terms: Masks
Fabrication of silicon oxide nanodot arrays by scanning probe lithography

Hutagalung SD, Darsono T, Khatijah A. Yaacob

Sains Malaysiana, 2008;37.

Atomic force microscopes (AFM) as one of the scanning probe microscopy (spm) modes have become useful tools, not only for observing surface morphology and nanostructure topography but also for fabrication of various nanostructures itself. In this work, silicon oxide (SiOx) patterns were formed on Si(100) surface by means of AFM anodization, where a non-contact mode used to oxidize Si wafer at the nanoscale size. The oxide patterns could serve as masks for the chemical etching of Si surface in alkaline solution in order to create the Si nanodots. A special attention is paid to finding relations between the size of dots and operational parameters as tip bias voltage and tip writing speed Dot arrays with 10 nm high and less than 50 nm in diameter have been successfully fabricated. The ability to control oxidation and scanning speed can be utilized in fabrication of complex nanostructures and make scanning probe lithography (SPL) as a very promising lithographic technique in nanoelectronic devices, nanophotonics and other high-tech areas.

Matched MeSH terms: Masks
Fulltext Facile Approaches of Polymeric Face Masks Reuse and Reinforcements for Micro-Aerosol Droplets and Viruses Filtration: A Review

Wibisono Y, Fadila CR, Saiful S, Bilad MR

Polymers (Basel), 2020 Oct 28;12(11).
PMID: 33126730 DOI: 10.3390/polym12112516

Since the widespread of severe acute respiratory syndrome of coronavirus 2 (SARS-CoV-2) disease, the utilization of face masks has become omnipresent all over the world. Face masks are believed to contribute to an adequate protection against respiratory infections spread through micro-droplets among the infected person to non-infected others. However, due to the very high demands of face masks, especially the N95-type mask typically worn by medical workers, the public faces a shortage of face masks. Many papers have been published recently that focus on developing new and facile techniques to reuse and reinforce commercially available face masks. For instance, the N95 mask uses a polymer-based (membrane) filter inside, and the filter membrane can be replaced if needed. Another polymer sputtering technique by using a simple cotton candy machine could provide a cheap and robust solution for face mask fabrication. This review discuss the novel approaches of face mask reuse and reinforcement specifically by using membrane-based technology. Tuning the polymeric properties of face masks to enhance filterability and virus inactivity is crucial for future investigation.

Matched MeSH terms: Masks
Fulltext The role of inversion and face masks on simultaneous and delayed face matching tasks

Estudillo AJ, Wong HK

PLoS One, 2024;19(1):e0295407.
PMID: 38166082 DOI: 10.1371/journal.pone.0295407

Although it is generally accepted that face recognition relies on holistic processing, it has been suggested that the simultaneous face matching task may depend on a more analytical or featural processing approach. However, empirical evidence supporting this claim is limited. In two experiments, we further explored the role of holistic and featural processing on simultaneous face matching by manipulating holistic processing through inversion and presenting faces with or without face masks. The results from Experiment 1 revealed that both inversion and face masks impaired matching performance. However, while the inversion effect was evident in both full-view and masked faces, the mask effect was only found in upright, but not inverted, faces. These results were replicated in Experiment 2 but, the inversion and mask effects were stronger in delayed face matching than in simultaneous face matching. Our findings suggest that simultaneous face matching relies on holistic processing, but to a smaller extent compared to higher memory-demanding identification tasks.

Matched MeSH terms: Masks*
The Proseal laryngeal mask airway in children: a comparison between two insertion techniques

Teoh CY, Lim FS

Paediatr Anaesth, 2008 Feb;18(2):119-24.
PMID: 18184242 DOI: 10.1111/j.1460-9592.2007.02385.x

The Proseal laryngeal mask airway (PLMA) is a relatively new supraglottic airway device with a drain tube to minimize the risk of gastric insufflation and aspiration. We compared introducer tool (IT) and gum elastic bougie (GEB)-guided techniques for insertion of the Proseal LMA in children.

Matched MeSH terms: Laryngeal Masks/adverse effects*
Fulltext Pulmonary Embolism Masquerading as Severe Pneumonia: A Case Report

Payus AO, Rajah R, Febriany DC, Mustafa N

Open Access Maced J Med Sci, 2019 Feb 15;7(3):396-399.
PMID: 30834009 DOI: 10.3889/oamjms.2019.114

BACKGROUND: De novo pulmonary embolism (DNPE) is a term used when pulmonary embolism (PE) occur in the absence of deep vein thrombosis (DVT). Most DNPE cases occur in a patient who had a recent injury to the chest.
CASE PRESENTATION: However, here we report a case of DNPE with a slightly different presentation where there is no preceding trauma and has symptoms that mimic severe pneumonia. He presented with high fever, dyspnoea and pleuritic chest pain. Despite on 10 L of oxygen supplementation via high flow mask and already given bolus intravenous antibiotic, the patient still tachypnoeic and was persistently in type I respiratory failure. His chest X-ray showed consolidative changes. Upon further investigation revealed no evidence of DVT on Doppler ultrasound and normal D-dimer level. Due to the high index of suspicion by the attending physician, PE was suspected and later confirmed with computed tomography pulmonary angiography scan. He was successfully treated with anticoagulation therapy. The objective of this case report is to share the difficult experience of diagnosing PE when the presentation highly atypical and mimics severe pneumonia.
CONCLUSION: And with such a masquerading presentation, one can easily miss the diagnosis. To the best of our knowledge, there are very few similar cases reported.

Matched MeSH terms: Masks
Fulltext Pathological findings in a mouse model of Japanese encephalitis infected via the footpad

Fu, Tzeh Long, Ong, Kien Chai, Wong, Kum Thong

Neurology Asia, 2015;20(4):349-354.
MyJurnal

We have developed and characterised a mouse model of Japanese encephalitis virus (JEV) infection via
footpad inoculation in order to better mimic viral transmission by mosquito bites. Two-week-old and
5-week-old mice consistently developed signs of infection such as ruffled fur, weight loss, hunchback
posture, tremors, mask-like facies and occasionally, hindlimb paralysis at 4 days post infection (dpi)
and 11-13 dpi, respectively. Most of the animals died within 24 to 48 hours following the onset of signs
of infection, with mortalities of 100% and 33.3% in 2-week-old and 5-week-old mice, respectively.
Mild meningitis and variable parenchymal inflammation with formation of microglial nodules, focal
necrosis and neuronophagia, and perivascular cuffing by inflammatory cells were observed in the
caudate nucleus, putamen, thalamus, cerebral cortex, brainstem, and spinal cord. Viral antigens/RNA
were demonstrated by immunohistochemisty and in situ hybridization, respectively, in most of these
areas as well as in the hippocampus and cerebellum, albeit more focally. The pathological findings in
this mouse model were generally similar to human Japanese encephalitis (JE) and other established JE
models but perhaps, compared to other JEV mouse models, it demonstrates lethal encephalitic infection
more consistently. We believe that our mouse model should be useful to study the pathogenesis of JE,
and for testing anti-viral drugs and vaccines

Matched MeSH terms: Masks

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