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RISS 인기검색어
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- 저자 : Khir (검색결과 6 건)
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An Uncommon Case of Bioprosthetic Mitral Valve Thrombosis Complicated by Intracerebral Haemorrhage
Shariff Raja Ezman Raja,Khir Rizmy Najme,Zainal Abidin Hafisyatul Aiza,Kasim Sazzli 아시아심장혈관영상의학회 2021 Cardiovascular Imaging Asia Vol.5 No.2
An 82-year-old man presented with bioprosthetic valve thrombosis (BVT) following a cardioembolic stroke due to mitral valve infective endocarditis. The patient had previously undergone bioprosthetic mitral valve replacement. After being discharged postoperatively, he represented with weakness due to a novel left-sided stroke and right-sided occipital intracerebral haemorrhage. Both transthoracic and transoesophageal echocardiography revealed BVT on the anterior portion of the prosthesis. Following a multi-disciplinary team discussion, it was agreed that thrombolytics and anticoagulation would be detrimental. The patient continued to worsen and eventually succumbed to congestive cardiac failure. BVT is uncommon, and patients often present with signs and symptoms of heart failure, shock, or embolism. There are no guidelines available for managing BVT in patients with concurrent intracerebral haemorrhage, which highlights the importance of multi-disciplinary decision-making.
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Atul Kumar,Mohd Haris Mohd Khir,Wan Ismail Wan Yusoff 한국지질과학협의회 2016 Geosciences Journal Vol.20 No.3
Accurate reservoir model requires complete information of subsurface properties, specifically porosity and permeability. Reservoir heterogeneity is the fundamental challenge for geoscientists to predict these properties which may affect the reservoir performance and their well productivity. Porosity is one of the key parameters for accumulation of hydrocarbon but its prediction is difficult due to significant variation over a reservoir volume. A spatial distribution of porosity can be investigated by integrating the 3-D seismic and well log attributes which may help in determining such reservoir variation. In addition, nonlinear multivariable regression techniques such as multivariable transform, Genetic algorithm, and Probabilistic Neural Network analysis have also been implemented to achieve high correlation coefficients between well log properties and seismic data. Results from nonlinear regression have better correlations than linear regression. In this study, a 3-D low frequency model (LFM) is proposed which can be estimated by kriging interpolation of resultant impedance values from well log data. Furthermore, “seismic inversion” is adopted for extracting correlated attributes to merge with the LFM so as to better construct a pseudo log volume. A polynomial neural network (PNN*1) is utilized to convert resultant acoustic impedance values into a distinct reservoir property such as porosity. PNN* is trained, tested and validated by using gammaray and resultant acoustic impedance values as input and effective porosity values as a target. The trained PNN* is then applied over the whole reservoir volume to generate a pseudo log volume. In the proposed low frequency model, an attempt has been made to achieve high correlation between the predicted and measured porosity logs. It will improve the reservoir characterization and lead to better estimation of hydrocarbon reserves. This low frequency model achieves better correlation between the predicted and true porosity log even with a minimum number of measured well logs.
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Acute Right Intracardiac Thrombus-in-Transit Complicated by Submassive Pulmonary Embolism
Raja Shariff Raja Ezman,Badrul Zaman Nazurah,Mohamad Razi Adli Azam,Najme Khir Rizmy,Kasim Sazzli 아시아심장혈관영상의학회 2021 Cardiovascular Imaging Asia Vol.5 No.1
A 61-year-old female presented with symptoms suggestive of congestive cardiac failure that was confirmed on transthoracic echocardiography (TTE) with the absence of an intracardiac thrombus. In the hospital, she suffered episodes of syncope, prompting further investigations. Repeat TTE revealed an acute mobile right atrial thrombus, and CT imaging of the pulmonary artery confirmed the presence of a massive pulmonary embolism (PE). Despite a low pulmonary embolism severity index (PESI) score, the patient underwent surgical pulmonary embolectomy. The prevalence of right-sided thrombi ranges between 4–18% in the presence of acute PE, and right-sided thrombi will almost always lead to PE. Our case highlights the limitation of the PESI score and emphasizes urgent management for the presence of a thrombus-in-transit, despite a low PESI score.
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Raja Ezman Faridz Raja Shariff,Lim Chiao Wen,Rizmy Najme Khir,Khairul Shafiq Ibrahim,Sazzli Kasim 아시아심장혈관영상의학회 2021 Cardiovascular Imaging Asia Vol.5 No.3
We report a rare case of delayed cardiac perforation that progressed to cardiac tamponade and initially presented as loss of pacemaker lead capture. A 50-year-old female with a singlelead permanent pacemaker for third-degree atrioventricular dissociation presented with lethargy, dyspnea, and reduced effort tolerance. Home monitoring by her cardiac device and an electrocardiogram performed on arrival showed loss of capture. Transthoracic echocardiogram revealed cardiac tamponade requiring urgent pericardiocentesis, revealing hemorrhagic effusion. Delayed perforation of her device leads was suspected, even though neither CT nor cardiac MRI revealed contrast leakage or displaced lead position. Cardiac perforation following device implantation is rare. This case is unique as it highlights an extreme presentation in which delayed perforation led to gradual accumulation progressing to tamponade and loss of device capture, both of which resolved following emergency pericardiocentesis. The main treatment of suspected lead perforation remains revision of leads, although evidence to support either a percutaneous or surgical approach remain debatable.
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A review of vibration-based MEMS hybrid energy harvesters
Mohammed Salim,Hakim S. Sultan Aljibori,Dhia Salim,M. Haris M. Khir,A. Sh. Kherbeet 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.11
Energy harvesters based on Micro-electromechanical systems (MEMS) are well known nowadays due to their small features, abilityfor monolithic integration with the integrated circuit in a single platform, robust, and easily fabricated in bulk. The piezoelectric (PZT)and the electromagnetic (EM) generators are examples of such energy harvesters. To further increase their effectiveness in harvestingambient energy, researchers started to venture into hybrid energy harvesters. Few literature reviews may be found on MEMS harvestingdevices, but not on hybrid harvesters in specific. This paper intended to further elaborate on the hybrid energy harvesters, reported Literatureon such harvesters for recent years with different architectures, models, and results are presented. Table of power comparison betweenthe reported harvesters is presented and discussed.
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