Papers by David Chandrakumar
A computational method for solving a class of singular boundary value problems arising in science and engineering
Egyptian Journal of Basic and Applied Sciences, 2016
Reliable Wavelet based Approximation Method for Some Nonlinear Differential Equations
Applied Mathematics & Information Sciences, 2016
Efficient kernel induced fuzzy c-means based on Gaussian function for imagedata analyzing
Journal of Intelligent & Fuzzy Systems, 2016
Percutaneous pulmonary valve implantation: A systematic review of clinical outcomes
International Journal of Cardiology, 2015
Could less be more?-A systematic review and meta-analysis of sublobar resections versus lobectomy for non-small cell lung cancer according to patient selection
Lung cancer (Amsterdam, Netherlands), Jan 19, 2015
There is renewed interest in performing segmentectomies and wedge resections for selected patient... more There is renewed interest in performing segmentectomies and wedge resections for selected patients with early-stage non-small cell lung cancer. However, comparative data on sublobar resections versus lobectomies include 'intentionally selected' patients who could tolerate either procedure, or 'compromised' patients who could only undergo sublobar resections due to significant comorbidities or insufficient cardiopulmonary reserve. To address this important point, the present meta-analysis aimed to compare the survival outcomes of sublobar resections and segmentectomies versus lobectomies based on patient selection and surgical intent. A systematic review was performed using 6 online databases to identify all comparative studies that presented survival data on sublobar resections versus lobectomy procedures. These studies were then categorized according to the patient selection process for those who underwent sublobar resections. Patients were considered 'intention...
A meta-analysis of robotic versus conventional mitral valve surgery
Heart, Lung and Circulation, 2015
ABSTRACT
Springer Proceedings in Mathematics & Statistics, 2014
In this paper, mathematical modeling of porous catalysts is discussed. An efficient wavelet metho... more In this paper, mathematical modeling of porous catalysts is discussed. An efficient wavelet method, called the shifted second kind Chebyshev wavelet method is used to obtain the solution for the concentration of species. An approximate polynomial expression for concentration and the effectiveness factors are obtained for general nonlinear Langmiur-Hinshelwood-Haugen-Watson type models which have variety of real rate function. To the best of our knowledge until there is no rigorous wavelet solution has been addressed in this model. The power of the manageable method is confirmed. The concentration and the effectiveness factors are also computed for the various limiting cases of LHHW models.
Annals of cardiothoracic surgery, 2014
Surgical resection is the preferred treatment modality for eligible candidates with non-small cel... more Surgical resection is the preferred treatment modality for eligible candidates with non-small cell lung cancer (NSCLC). However, the selection of sublobar resection versus lobectomy for early-stage NSCLC remains controversial. Previous meta-analyses comparing these two procedures presented data without considering the significant differences in the patient selection processes in individual studies. The present study aimed to compare the overall survival (OS) and disease-free survival (DFS) outcomes of patients who underwent sublobar resections who were also eligible for lobectomy procedures with those who underwent lobectomy. An electronic search was conducted using five online databases from their dates of inception to December 2013. Studies were selected according to predefined inclusion criteria and meta-analyzed using hazard ratio (HR) calculations. Twelve studies met the selection criteria, including 1,078 patients who underwent sublobar resections and 1,667 patients who underw...
Annals of cardiothoracic surgery, 2013
Minimally invasive mitral valve surgery through a mini-thoracotomy approach was developed in the ... more Minimally invasive mitral valve surgery through a mini-thoracotomy approach was developed in the mid-1990s as an alternative to conventional sternotomy, but with reduced trauma and quicker recovery. However, technical demands and a paucity of comparative data have thus far limited the widespread adoption of minimally invasive mitral valve repair (MIMVR). Previous meta-analyses have grouped various surgical techniques and underlying valvular disease aetiologies together for comparison. The present study aimed to compare the clinical outcomes of MIMVR versus conventional mitral valve repair in patients with degenerative mitral valve disease. A systematic review of the current literature was performed through nine electronic databases from January 1995 to July 2013 to identify all relevant studies with comparative data on MIMVR versus conventional mitral valve surgery. Measured endpoints included mortality, stroke, renal failure, wound infection, reoperation for bleeding, aortic dissec...
An Efficient Wavelet Based Approximation Method to Steady State Reaction–Diffusion Model Arising in Mathematical Chemistry
The Journal of Membrane Biology, 2014
The mathematical model of Rahamathunissa and Rajendran (J Math Chem 44:849-861, 2008) in an amper... more The mathematical model of Rahamathunissa and Rajendran (J Math Chem 44:849-861, 2008) in an amperometric biosensor response is discussed. In this paper, we have applied the shifted second kind Chebyshev wavelets (CW) to obtain the numerical solutions of reaction-diffusion equations containing a nonlinear term related to Michaelis-Menton kinetics of the enzymatic reaction. The application of the shifted second kind CW operational matrices for solving initial and boundary value problems is presented. The obtained numerical results demonstrate efficient and applicability of the proposed method. The power of the manageable method is confirmed. Moreover the use of shifted second kind CW method is found to be simple, efficient, accurate, small computation cost, and computationally attractive.
European Journal of Cardio-Thoracic Surgery, 2014
We thank Dr Poullis for his comments [1] on our article [2] and recommendation of his Excel datas... more We thank Dr Poullis for his comments [1] on our article [2] and recommendation of his Excel datasheet to record continuous data for variables such as blood pressure, temperature, glucose, lactate and haematocrit. The point that Dr Poullis raises is highly pertinent to surgical studies and databases-how much data do we need to record?
Systematic review of percutaneous interventions for malignant pericardial effusion
Heart, 2015
The present systematic review assessed the safety and efficacy of percutaneous interventions for ... more The present systematic review assessed the safety and efficacy of percutaneous interventions for malignant pericardial effusion (MPE), with primary endpoint of recurrence of pericardial effusion. Electronic searches of six databases identified thirty-one studies, reporting outcomes following isolated pericardiocentesis (n=305), pericardiocentesis followed by extended catheter drainage (n=486), pericardial instillation of sclerosing agents (n=392) or percutaneous balloon pericardiotomy (PBP) (n=157). Isolated pericardiocentesis demonstrated a pooled recurrence rate of 38.3%. Pooled recurrence rates for extended catheter drainage, pericardial sclerosis and PBP were 12.1%, 10.8% and 10.3%, respectively. Procedure-related mortality ranged from 0.5-1.0% across the percutaneous interventions. Although isolated pericardiocentesis can safely deliver immediate symptomatic relief, subsequent catheter drainage or sclerotherapy are required to minimize recurrence. PBP has been shown to be highly effective and may be particularly useful in managing recurrent effusions. Ultimately, the choice of intervention must be based on the clinical status of patients, their underlying malignancy and the expertise available.
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Papers by David Chandrakumar