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Frequency analysis of capnogram signals to differentiate asthmatic and non-asthmatic conditions using radial basis function neural networks

Kazemi M, Bala Krishnan M, Aik Howe T

Iran J Allergy Asthma Immunol, 2013 Sep;12(3):236-46.
PMID: 23893807

In this paper, the method of differentiating asthmatic and non-asthmatic patients using the frequency analysis of capnogram signals is presented. Previously, manual study on capnogram signal has been conducted by several researchers. All past researches showed significant correlation between capnogram signals and asthmatic patients. However all of them are just manual study conducted through the conventional time domain method. In this study, the power spectral density (PSD) of capnogram signals is estimated by using Fast Fourier Transform (FFT) and Autoregressive (AR) modelling. The results show the non-asthmatic capnograms have one component in their PSD estimation, in contrast to asthmatic capnograms that have two components. Furthermore, there is a significant difference between the magnitude of the first component for both asthmatic and non-asthmatic capnograms. The effectiveness and performance of manipulating the characteristics of the first frequency component, mainly its magnitude and bandwidth, to differentiate between asthmatic and non-asthmatic conditions by means of receiver operating characteristic (ROC) curve analysis and radial basis function (RBF) neural network were shown. The output of this network is an integer prognostic index from 1 to 10 (depends on the severity of asthma) with an average good detection rate of 95.65% and an error rate of 4.34%. This developed algorithm is aspired to provide a fast and low-cost diagnostic system to help healthcare professional involved in respiratory care as it would be possible to monitor severity of asthma automatically and instantaneously.
Fulltext Scanning Electron Microscopy Study of Retrieved Implants Suggests a Ratcheting Mechanism Behind Medial Migration in Cephalomedullary Nailing of Hip Fractures

Law GW, Koh J, Yew A, Howe TS

Malays Orthop J, 2020 Mar;14(1):7-17.
PMID: 32296476 DOI: 10.5704/MOJ.2003.002

Introduction: Medial migration is the paradoxical migration of the femoral neck element (FNE) superomedially against gravity with respect to the intramedullary component of the cephalomedullary device, increasingly seen in the management of pertrochanteric hip fractures with the intramedullary nail. We postulate that the peculiar anti-gravity movement of the FNE in the medial migration phenomenon stems from a ratcheting mechanism at the intramedullary nail-FNE interface, which should inadvertently produce unique wear patterns on the FNE that can be seen with high-powered microscopy. By examining the wear patterns on retrieved implants from patients with medial migration, our study aims to draw clinical correlations to the ratcheting mechanism hypothesis.
Material and Methods: Four FNEs were retrieved from revision surgeries of four patients with prior intramedullary nail fixation of their pertrochanteric hip fractures complicated by femoral head perforation. The FNEs were divided into two groups based on whether or not there was radiographic evidence of medial migration prior to the revisions. Wear patterns on the FNEs were then assessed using both scanning electron microscopy and light microscopy.
Results: Repetitive, linearly-arranged, regularly-spaced, unique transverse scratch marks were found only in the group with medial migration, corresponding to the specific segment of the FNE that passed through the intramedullary component of the PFNA during medial migration. These scratch marks were absent in the group without medial migration.
Conclusion: Our findings are in support of a ratcheting mechanism behind the medial migration phenomenon with repetitive toggling at the intramedullary nail-FNE interface and progressive propagation of the FNE against gravity.
Periprosthetic Fractures after Total Knee Arthroplasty: the Influence of Pre-Operative Mechanical Factors versus Intraoperative Factors

Zainul-Abidin S, Lim B, Bin-Abd-Razak HR, Gatot C, Allen JC, Koh J, et al.

Malays Orthop J, 2019 Jul;13(2):28-34.
PMID: 31467648 DOI: 10.5704/MOJ.1907.005

Introduction: Periprosthetic fractures are a devastating complication following total knee arthroplasty. Little is known about the effect of mechanical factors on the incidence of periprosthetic fractures. The aim of this study was to examine the correlation between pre-operative mechanical factors, like side of surgery, coronal alignment and pre-operative range of motion and intra-operative factors, and the incidence of a periprosthetic fracture, following primary total knee arthroplasty (TKA). Materials and Methods: Forty-two patients with periprosthetic fractures (PPF) after primary TKA were identified from our hospital arthroplasty registry. These patients were matched two-to-one for gender and age at primary knee arthroplasty to 84 patients without PPF. The incidence of periprosthetic fracture with regards to laterality, coronal alignment and pre-operative range of motion was analysed. Intra-operative factors like implant type, patellar resurfacing and notching were also analysed using logistic regression. Results: Coronal alignment, pre-operative range of motion and patella resurfacing were not significant predictors of periprosthetic fractures. Anterior femoral notching was found to be significantly higher in the fracture group with an odds ratio of 17. Left sided surgery was also significantly higher in the periprosthetic fracture group. Conclusion: Periprosthetic fractures are 17 times more likely to occur in a knee with anterior femoral notching. Preoperative factors like coronal alignment and poor preoperative range of motion do not seem to increase the risk of periprosthetic fractures after TKA.
Fulltext Concomitant Ulnar Styloid Fractures in Distal Radius Osteosynthesis Does Not Impact Radiographic Outcomes, Ulnar Sided Symptoms and Patient Outcomes

Wong KC, Wu M, Zai Q, Wong MK, Howe TS, Koh S, et al.

Malays Orthop J, 2023 Mar;17(1):142-148.
PMID: 37064641 DOI: 10.5704/MOJ.2303.017

INTRODUCTION: Current literature reports varied significance of ulnar styloid fractures (USF) associated with distal radius fractures. Our study assesses the role of ulnar styloid fractures and fragment size in surgically managed distal radius fractures.
MATERIALS AND METHODS: We reviewed patients who underwent surgical fixation of distal radius fractures between January 2004 to June 2006. Patients were divided into those with (Group 1) and without (Group 0) USFs. Post-operative radiographic parameters, clinical outcomes and overall wrist function were analysed. Outcomes included ulnar-sided wrist pain, extensor carpi ulnaris (ECU) tendinitis, triangular fibrocartilage complex (TFCC) grind test, distal radioulnar joint (DRUJ) instability and pain. Overall wrist function was assessed with range of motion and Disabilities of the Arm, Shoulder and Hand (DASH) score.
RESULTS: Our study cohort included 31 males and 23 females, and 38.9% of these patients had concomitant USFs. There was no difference in terms of demographic data and fracture configuration between groups. Radiographic parameters were similar, except for palmar tilt, which was significantly higher in Group 1 (4.6º vs 9.4º, p=0.047). At 24 months, there were no differences in clinical outcomes and overall wrist function. A sub-group analysis showed that mean USF fragment size was larger in patients with a positive TFCC grind test (3.9mm vs 7.3mm, p=0.033).
CONCLUSION: The presence of USFs in surgically managed distal radius fractures does not compromise clinical and functional outcome. Similarly, the size of USFs does not impact clinical and functional outcome but is associated with the presence of a positive TFCC grind test.
Fulltext Cochrane Rehabilitation: report of the first year of work

Negrini S, Arienti C, Pollet J, Engkasan JP, Gimigliano F, Grubisic F, et al.

Eur J Phys Rehabil Med, 2018 Jun;54(3):463-465.
PMID: 29901359 DOI: 10.23736/S1973-9087.18.05317-0

Since his launch Cochrane Rehabilitation has started working to be a bridge between Cochrane and rehabilitation. After a fist period of work organization, the field has started producing actions through its committees: communication, education, methodology, publication and reviews. All the results of this first year of activity are listed in this report.
Cochrane Rehabilitation: Organization and Functioning

Negrini S, Arienti C, Gimigliano F, Grubišić F, Howe T, Ilieva E, et al.

Am J Phys Med Rehabil, 2018 01;97(1):68-71.
PMID: 28953033 DOI: 10.1097/PHM.0000000000000832
Administration of tranexamic acid for victims of severe trauma within pre-hospital care ambulance services (PHCAS) in Malaysia

Shah Jahan MY, Shamila MA, Nurul Azlean N, Mohd Amin M, Anandakumar K, Ahmad Ibrahim KB, et al.

Med J Malaysia, 2019 08;74(4):300-306.
PMID: 31424037

INTRODUCTION: Trauma is a Global threat and the 5th highest cause of all-cause mortality in Malaysia caused predominantly due to road traffic accidents. Majority of trauma victims are young adults aged between 21-40 years old. In Malaysia, 24 out of 100,000 population die annually due to trauma, rating us amongst the highest in South East Asia. These alarming figures justify aggressive preventive and mitigation strategies. The aim of this paper is to promote the implementation of evidence-based interventions that will reduce the rate of preventable death because of trauma. Tranexamic acid is one of the few interventions in the early management of severe trauma with level-one evidence. Tranexamic acid has been proven to reduce all causes of mortality and mortality due to bleeding. Evidence proves that it is most effective when administered early, particularly within the 1st hour of trauma. This proposed guideline is formulated based upon quality evidence from multicentre studies, clinical practices in other countries and consideration of the local demographic factors with the intent of enabling an easy and simple pathway to administer tranexamic acid early in the care of the severely injured.
CONCLUSION: The guideline highlights select pre-hospital criteria's and the methods for drug administration. The authors recognise that some variants may be present amongst certain institutions necessitating minor adaptations, nevertheless the core principles of advocating tranexamic acid early in the course of pre-hospital trauma should be adhered to.
Fulltext Cochrane Rehabilitation: 2020 annual report

Arienti C, Kiekens C, Bettinsoli R, Engkasan JP, Frischknecht R, Gimigliano F, et al.

Eur J Phys Rehabil Med, 2021 Apr;57(2):303-308.
PMID: 33971699 DOI: 10.23736/S1973-9087.21.06877-5

During its fourth year of existence, Cochrane Rehabilitation went on to promote evidence-informed health decision-making in rehabilitation. In 2020, the outbreak of the COVID-19 pandemic has made it necessary to alter priorities. In these challenging times, Cochrane Rehabilitation has firstly changed its internal organisation and established a new relevant project in line with pandemic needs: the REH-COVER (Rehabilitation - COVID-19 evidence-based response) action. The aim was to focus on the timely collection, review and dissemination of summarised and synthesised evidence relating to COVID-19 and rehabilitation. Cochrane Rehabilitation REH-COVER action has included in 2020 five main initiatives: 1) rapid living systematic reviews on rehabilitation and COVID-19; 2) interactive living evidence map on rehabilitation and COVID-19; 3) definition of the research topics on "rehabilitation and COVID-19" in collaboration with the World Health Organization (WHO) rehabilitation programme; 4) Cochrane Library special collection on Coronavirus (COVID-19) rehabilitation; and 5) collaboration with COVID-END for the topics "rehabilitation" and "disability." Furthermore, we are still carrying on five different special projects: Be4rehab; RCTRACK; definition of rehabilitation for research purposes; ebook project; and a prioritization exercise for Cochrane Reviews production. The Review Working Area continued to identify and "tag" the rehabilitation-relevant reviews published in the Cochrane library; the Publication Working Area went on to publish Cochrane Corners, working more closely with the Cochrane Review Groups (CRGs) and Cochrane Networks, particularly with Cochrane Musculoskeletal, Oral, Skin and Sensory Network; the Education Working Area, the most damaged in 2020, tried to continue performing educational activities such as workshops in different online meetings; the Methodology Working Area organized the third and fourth Cochrane Rehabilitation Methodological (CRM) meetings respectively in Milan and Orlando; the Communication Working Area spread rehabilitation evidences through different channels and translated the contents in different languages.
Fulltext Cochrane Rehabilitation: 2019 annual report

Arienti C, Kiekens C, Bettinsoli R, Engkasan JP, Gimigliano F, Grubisic F, et al.

Eur J Phys Rehabil Med, 2020 Feb;56(1):120-125.
PMID: 32093464 DOI: 10.23736/S1973-9087.20.06188-2

During its third year of existence, Cochrane Rehabilitation goals included to point out the main methodological issues in rehabilitation research, and to increase the Knowledge Translation activities. This has been performed through its committees and specific projects. In 2019, Cochrane Rehabilitation worked on five different special projects at different stages of development: 1) a collaboration with the World Health Organization to extract the best evidence for Rehabilitation (Be4rehab); 2) the development of a reporting checklist for Randomised Controlled Trials in rehabilitation (RCTRACK); 3) the definition of what is the rehabilitation for research purposes; 4) the ebook project; and 5) a prioritization exercise for Cochrane Reviews production. The Review Committee finalized the screening and "tagging" of all rehabilitation reviews in the Cochrane library; the Publication Committee increased the number of international journals with which publish Cochrane Corners; the Education Committee continued performing educational activities such as workshops in different meetings; the Methodology Committee performed the second Cochrane Rehabilitation Methodological Meeting and published many papers; the Communication Committee spread the rehabilitation evidence through different channels and translated the contents in different languages. The collaboration with several National and International Rehabilitation Scientific Societies, Universities, Hospitals, Research Centers and other organizations keeps on growing.
Fulltext Cochrane Rehabilitation: 2018 annual report

Negrini S, Arienti C, Engkasan JP, Gimigliano F, Grubisic F, Howe T, et al.

Eur J Phys Rehabil Med, 2019 Apr;55(2):314-318.
PMID: 30938139 DOI: 10.23736/S1973-9087.19.05785-X

During its second year of existence, Cochrane Rehabilitation worked hard to accomplish new and old goals. The Review Committee completed the massive task of identifying and "tagging" all rehabilitation reviews in the Cochrane library. The Publication Committee signed agreements with several international journals and started the publication of Cochrane Corners. The Education Committee performed educational activities such as workshops in International Meetings. The Methodology Committee has completed a two days Cochrane Rehabilitation Methodological Meeting in Paris of which the results will soon be published. The Communication Committee reaches almost 5,000 rehabilitation professionals through social media, and is working on the translation of contents in Italian, Spanish, French, Dutch, Croatian and Japanese. Memoranda of Understanding have been signed with several National and International Rehabilitation Scientific Societies, Universities, Hospitals, Research Centres and other organizations. The be4rehab (best evidence for rehabilitation) project has been started with the World Health Organisation (WHO) to extract from Cochrane reviews and clinical guidelines the best currently available evidence to produce the WHO Minimum Package of Rehabilitation Interventions. The Cochrane Rehabilitation ebook is under development as well as a priority setting exercise with 39 countries from all continents.