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RISS 인기검색어
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- 저자 : Hari Chandran (검색결과 4 건)
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Electroacupuncture-Assisted Craniotomy on an Awake Patient
Amritpal Sidhu,Trushna Murgahayah,Vairavan Narayanan,Hari Chandran,Vicknes Waran 사단법인약침학회 2017 Journal of Acupuncture & Meridian Studies Vol.10 No.1
Although acupuncture has existed for over 2000 years, its application as an anesthetic aid began in the 1950s in China. The first surgical procedure performed under acupuncture anesthesia was a tonsillectomy. Soon thereafter, major and minor surgical procedures took place with electroacupuncture alone providing the anesthesia. The procedures performed were diverse, ranging from cardiothoracic surgery to dental extractions. Usage of acupuncture anesthesia, specifically in neurosurgery, has been well documented in hospitals across China, especially in Beijing, dating back to the 1970s. We present a case of a 65-year-old man who presented with right-sided body weakness. He had a past medical history of uncontrolled diabetes mellitus, hypertension, and obstructive sleep apnea requiring use of a nasal continuous positive airway pressure device during sleep. We performed a computed tomography brain scan, which revealed a left-sided acute on chronic subdural hemorrhage. Due to his multiple comorbidities, we decided to perform the surgical procedure under electroacupuncture anesthesia. The aim of this case report is to describe a craniotomy performed under electroacupuncture on an elderly patient with multiple comorbidities who was awake during the procedure and in whom this procedure, if it had been performed under general anesthesia, would have carried high risk.
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K.W. Goh,Y.H. Wong,R.S.K. Singh,Hari Chandran,S.K. Wong,K.Y. Sara Lee 한양대학교 세라믹연구소 2022 Journal of Ceramic Processing Research Vol.23 No.2
The extraction of calcium from natural biowaste material such as chicken eggshells have been shown to be viable to synthesiscalcium phosphate bioceramic. In this work, eggshell-derived hydroxyapatite powder was synthesised by using the wetchemical precipitation technique coupled with microwave irradiation at low power (700 W) at varying exposure time from 5to 30 min. The derived nano-powders were examined to determine the phases present, chemical bonding and microstructuralevolution. It was revealed that the irradiation time has an effect on the degree of crystallinity and both the crystallite andparticle size of the derived powders although the hydroxyapatite phase stability was not disrupted. An exposure time of 15 min. was determined to be sufficient when subjected to low power microwave irradiation to formed a well-defined needle-likehydroxyapatite particles having an average crystallite size of about 22 nm. On the contrary to many literatures, this study hasdemonstrated the viability of synthesizing a useful bioceramic from using biowaste eggshells coupled with microwaveirradiation at low power of 700 W for very short period of time to produce nano-range needle-like hydroxyapatite particlessuitable for biomedical application.
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Tang, Weng Heng,Alip, Adlinda,Saad, Marniza,Phua, Vincent Chee Ee,Chandran, Hari,Tan, Yi Hang,Tan, Yan Yin,Kua, Voon Fong,Wahid, Mohamed Ibrahim,Tho, Lye Mun Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.5
Background: Brain metastases occur in about 20-40% of patients with non-small-cell lung carcinoma (NSCLC), and are usually associated with a poor outcome. Whole brain radiotherapy (WBRT) is widely used but increasingly, more aggressive local treatments such as surgery or stereotactic radiosurgery (SRS) or stereotactic radiotherapy (SRT) are being employed. In our study we aimed to describe the various factors affecting outcomes in NSCLC patients receiving local therapy for brain metastases. Materials and Methods: The case records of 125 patients with NSCLC and brain metastases consecutively treated with radiotherapy at two tertiary centres from January 2006 to June 2012 were analysed for patient, tumour and treatment-related prognostic factors. Patients receiving SRS/SRT were treated using Cyberknife. Variables were examined in univariate and multivariate testing. Results: Overall median survival was 3.4 months (95%CI: 1.7-5.1). Median survival for patients with multiple metastases receiving WBRT was 1.5 months, 1-3 metastases receiving WBRT was 3.6 months and 1-3 metastases receiving surgery or SRS/SRT was 8.9 months. ECOG score (${\leq}2$ vs >2, p=0.001), presence of seizure (yes versus no, p=0.031), treatment modality according to number of brain metastases (1-3 metastases+surgery or $SRS/SRT{\pm}WBRT$ vs 1-3 metastases+WBRT only vs multiple metastases+WBRT only, p=0.007) and the use of post-therapy systemic treatment (yes versus no, p=0.001) emerged as significant on univariate analysis. All four factors remained statistically significant on multivariate analysis. Conclusions: ECOG ${\leq}2$, presence of seizures, oligometastatic disease treated with aggressive local therapy (surgery or SRS/SRT) and the use of post-therapy systemic treatment are favourable prognostic factors in NSCLC patients with brain metastases.
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Effect of annealing treatment on the characteristics of bovine bone
A. Niakan,S. Ramesh,C.Y. Tan,J. Purbolaksono,Hari Chandran,W.D. Teng 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.2
The effect of annealing on the properties of bovine bone was investigated over the temperature range of 400 ℃ to 1300 ℃ at a ramp rate of 10 ℃/minute. The XRD results indicated that annealing at between 600 ℃ and 1100 ℃ resulted in phase pure hydroxyapatite (HA). However, decomposition of HA to form tri-calcium phosphate was observed for samples annealed above 1000 ℃. Thermo-gram analysis of bovine bone revealed the existence of organic combinations that was completely removed from the structure during heat treatment above 600 ℃. Annealed bovine bone between 800 ℃-1000 ℃ exhibited features of interconnecting pore structure, suitable for biomedical application. The study revealed that proper heat treatment through the control of annealing temperature represent a viable method to produce a HA structure from bovine bone.
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