7 results on '"Kannan Muthuraman A"'
Search Results
2. Prevalence of concomitant pulmonary tuberculosis in patients with newly diagnosed silicosis in a tertiary care center in South India
- Author
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Navaneethakrishnan Muthulakshmi, Saravanavasan Rajendran, and Kannan Muthuraman Alagappan
- Subjects
silicosis ,silicotuberculosis ,mycobacterium tuberculosis ,lung diseases ,prevalence ,Medicine - Abstract
Background: Long-term exposure to silica dust makes people prone for silicosis which raises the risk of the individual in developing pulmonary tuberculosis (PTB). Silicosis is a progressive lung disease characterize with shortness of breath, cough, fever, and bluish skin, caused due to inhalation of crystalline silica dust found in abundance in sand, rock, and quartz. Aims and Objectives: The disease is known to effect the functioning of macrophages making it unable to defend mycobacterium species, thus allowing the bacterium to invade and develop tuberculosis. Materials and Methods: A retrospective cross-sectional study is carried out to estimate the prevalence of PTB in newly diagnosed silicosis patients at Madurai Medical College, Madurai, Tamil Nadu. All the patients who got registered in Occupational Lung Diseases Registry from January 2016 to December 2021 are included in the study. Silicosis patients tested positive on sputum CBNAAT are considered as silicotubercular patients, whose prevalence is calculated. Results: Our study included a total of 54 subjects (90.8% males and 8.2% female) with mean SD age of 38±6.7 years ranging from 26 to 53 years. Of which 22 patients, 40.7% tested positive for Mycobacterium tuberculosis (MTB) on sputum CBNAAT. The prevalence of MTB in among silicosis patients was found to be 40.7%. Conclusions: Association of TB and silicosis is very strong with the prevalence of TB among silicosis patients as 40.7%. Our study also observed the male sex and elder age as elevated risk of developing silicotuberculosis. All the people getting exposed to silica dust need to be educated in the usage and usefulness of protective equipment.
- Published
- 2023
- Full Text
- View/download PDF
3. Clinical profile and Prevalence of poisoning patients presenting to the emergency department of a teaching hospital in Kerala: A retrospective comparative study before and during COVID-19 pandemic
- Author
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Linu S M, Manojan KK, Kannan Muthuraman A, Sivam Roopasree, and Mathen P George
- Subjects
coronavirus ,poisoning ,pandemics ,mental health, emergencies ,Toxicology. Poisons ,RA1190-1270 - Abstract
Background: Emergency physicians must be updated about the variations in poisoning pattern during Covid19 pandemic. Limited data exist on the incidence and characteristics of patients presenting with poisoning in Indian Emergency Departments (ED) during the COVID 19 pandemic. Hence, we aimed to explore the impact of Covid19 pandemic on poisoning cases presenting to the ED.Methods: This cross-sectional retrospective study was conducted on poisoning patients presenting to ED during the pandemic period (April 1-October 30, 2020 (period 2)), and a matching period before the pandemic (September 1,2019 to March 31, 2020 (period 1)). The rate of prevalence and clinical profile were compared between period 1 and 2 using appropriate statistical test.Results: A total of 111 (periods 1 = 57, and periods 2 = 54) cases were analysed. Poisoning prevalence rates had slightly increased by 2.7% before the pandemic (51.33%) in comparison to during the pandemic (48.6%) period (p=0.3). Females were predominant in both periods, and the mean age of 32.5 years. The predominant (57%) patient age group was 15-34 years. 36.9% (n=41) patients consumed multiple poisons, 19.8% (n=22) consumed paracetamol, and 14.4% (n=16) patients consumed psychiatric medications. Before lockdown, 27.02% (n=30) patients presented within 3 hours ingestion, and 21.6% (n=24) presented after 3 hours ingestion (p=0.12). A significant delay in arrival of poisoning cases during lockdown (p= 0.12) with increased hospital admission (p=0.03) was observed. A psychiatric disorder was observed in 36.03% cases. Majority of the cases were admitted in the ICU, and 0.9%(n=1) death was recorded.Conclusions: This is the first Indian study that describes the incidence of poisoning cases and their pattern during the COVID 19pandemic period, study revealed that increased mental health crisis in low resource settings in rural Kerala affects predominantly young population. Study implies the importance of priming the mental health care professionals to initiate their mental health screening programmes.
- Published
- 2021
- Full Text
- View/download PDF
4. Monitoring and Performance Assessment of GNSS Inter-constellation Timescale Biases
- Author
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Robert Meyer, Yoaz Bar-Sever, Kannan Muthuraman, and Zoltan Biacs
- Subjects
Quasi-Zenith Satellite System ,business.industry ,Computer science ,Real-time computing ,Broadcasting ,symbols.namesake ,GNSS applications ,Global Positioning System ,Galileo (satellite navigation) ,symbols ,GLONASS ,business ,Differential GPS ,Constellation - Abstract
Consistent inter-constellation timing is key to GNSS interoperability. We report a new capability, based on JPL’s Global Differential GPS (GDGPS) System, to monitor, assess, and predict GNSS inter-constellation timescale biases, globally, robustly, and in real-time. We demonstrate sub-nanosecond (one sigma) accuracy in determining the inter-constellation timescale bias on a sub-daily basis among all GNSS constellations with a global footprint, and a somewhat reduced accuracy relative to the regional GNSS constellations. The timescale of a specific GNSS constellation is an attribute of its broadcast ephemeris, and can only be indirectly realized through positioning (and timing) of a receiver (or preferably multiple receivers) relative to another timescale. But that process gets inevitably entangled with receiver timing biases, which are receiver-specific, installation-specific, temperature dependent, signal dependent, and constellation dependent… Therein lies the challenge of accessing, monitoring and inter-comparing the timescales expressed in the broadcast of the GNSS constellations. We compare two approaches for determining the biases between GPS and all other GNSS constellations: GLONASS, BeiDou, Galileo, QZSS, and NAVIC. Both approaches leverage the GDGPS global real-time GNSS tracking network of 60+ geodetic-quality receivers, many of which are in well-controlled environments, including several timing labs. Having so many receivers enable robust quality control and error assessment. We compare our estimates of inter-constellation biases to the values broadcasted by a variety of constellations over the last couple of years, and found general agreement at the few nsec level RMS, but also periods of large discrepancies, depending on the broadcasting constellation. We will discuss the inter-operability implications of errors in the relative timescale, and briefly describe our offering for real-time monitoring and prediction of these timescales.
- Published
- 2021
- Full Text
- View/download PDF
5. Prevalence of concomitant pulmonary tuberculosis in patients with newly diagnosed silicosis in a tertiary care center in South India.
- Author
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Muthulakshmi, Navaneethakrishnan, Rajendran, Saravanavasan, and Alagappan, Kannan Muthuraman
- Subjects
TUBERCULOSIS ,SILICOSIS ,TUBERCULOSIS patients ,SILICA dust ,MYCOBACTERIUM tuberculosis - Abstract
Background: Long-term exposure to silica dust makes people prone for silicosis which raises the risk of the individual in developing pulmonary tuberculosis (PTB). Silicosis is a progressive lung disease characterize with shortness of breath, cough, fever, and bluish skin, caused due to inhalation of crystalline silica dust found in abundance in sand, rock, and quartz. Aims and Objectives: The disease is known to effect the functioning of macrophages making it unable to defend mycobacterium species, thus allowing the bacterium to invade and develop tuberculosis. Materials and Methods: A retrospective cross-sectional study is carried out to estimate the prevalence of PTB in newly diagnosed silicosis patients at Madurai Medical College, Madurai, Tamil Nadu. All the patients who got registered in Occupational Lung Diseases Registry from January 2016 to December 2021 are included in the study. Silicosis patients tested positive on sputum CBNAAT are considered as silicotubercular patients, whose prevalence is calculated. Results: Our study included a total of 54 subjects (90.8% males and 8.2% female) with mean SD age of 38±6.7 years ranging from 26 to 53 years. Of which 22 patients, 40.7% tested positive for Mycobacterium tuberculosis (MTB) on sputum CBNAAT. The prevalence of MTB in among silicosis patients was found to be 40.7%. Conclusions: Association of TB and silicosis is very strong with the prevalence of TB among silicosis patients as 40.7%. Our study also observed the male sex and elder age as elevated risk of developing silicotuberculosis. All the people getting exposed to silica dust need to be educated in the usage and usefulness of protective equipment. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
6. Clinical profile and Prevalence of poisoning patients presenting to the emergency department of a teaching hospital in Kerala: A retrospective comparative study before and during COVID-19 pandemic.
- Author
-
S. M., LINU, K. K., MANOJAN, A., KANNAN MUTHURAMAN, ROOPASREE, SIVAM, and GEORGE, MATHEN P.
- Subjects
POISONING ,COVID-19 pandemic ,PANDEMICS ,MEDICAL personnel ,MENTAL health services ,TEACHING hospitals ,MENTAL health personnel - Abstract
Background: Emergency physicians must be updated about the variations in poisoning pattern during Covid19 pandemic. Limited data exist on the incidence and characteristics of patients presenting with poisoning in Indian Emergency Departments (ED) during the COVID 19 pandemic. Hence, we aimed to explore the impact of Covid19 pandemic on poisoning cases presenting to the ED. Methods: This cross-sectional retrospective study was conducted on poisoning patients presenting to ED during the pandemic period (April 1-October 30, 2020 (period 2)), and a matching period before the pandemic (September 1,2019 to March 31, 2020 (period 1)). The rate of prevalence and clinical profile were compared between period 1 and 2 using appropriate statistical test. Results: A total of 111 (periods 1 = 57, and periods 2 = 54) cases were analysed. Poisoning prevalence rates had slightly increased by 2.7% before the pandemic (51.33%) in comparison to during the pandemic (48.6%) period (p=0.3). Females were predominant in both periods, and the mean age of 32.5 years. The predominant (57%) patient age group was 15-34 years. 36.9% (n=41) patients consumed multiple poisons, 19.8% (n=22) consumed paracetamol, and 14.4% (n=16) patients consumed psychiatric medications. Before lockdown, 27.02% (n=30) patients presented within 3 hours ingestion, and 21.6% (n=24) presented after 3 hours ingestion (p=0.12). A significant delay in arrival of poisoning cases during lockdown (p= 0.12) with increased hospital admission (p=0.03) was observed. A psychiatric disorder was observed in 36.03% cases. Majority of the cases were admitted in the ICU, and 0.9%(n=1) death was recorded. Conclusions: This is the first Indian study that describes the incidence of poisoning cases and their pattern during the COVID 19pandemic period, study revealed that increased mental health crisis in low resource settings in rural Kerala affects predominantly young population. Study implies the importance of priming the mental health care professionals to initiate their mental health screening programmes. [ABSTRACT FROM AUTHOR]
- Published
- 2021
7. C/N0Estimation for Modernized GNSS Signals: Theoretical Bounds and a Novel Iterative Estimator
- Author
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Daniele Borio and Kannan Muthuraman
- Subjects
Engineering ,business.industry ,Emphasis (telecommunications) ,Aerospace Engineering ,Estimator ,Variance (accounting) ,Noise (electronics) ,symbols.namesake ,Additive white Gaussian noise ,GNSS applications ,Electronic engineering ,symbols ,Code (cryptography) ,Variance reduction ,Electrical and Electronic Engineering ,business ,Algorithm - Abstract
A reliable technique for carrier-to-noise density power ratio (C/N0) estimation is required to quantify the performance of weak Global Navigation Satellite System (GNSS) signal tracking. This paper provides a comprehensive theoretical analysis of the C/N0 estimation process with emphasis on the use of both navigation data and pilot channels available in modernized GNSS signals. A theoretical bound on the noise variance reduction achievable by using both the data and pilot channel in Additive White Gaussian Noise (AWGN) is derived under the assumption of perfect code/carrier frequency synchronization. The derivation and use of this bound for the analysis of C/N0 estimators are considered novel contributions of this work. A detailed analysis of bias levels and noise variance of maximum-likelihood (ML) C/N0 estimators under weak signal conditions is provided. A novel iterative joint data/pilot C/N0 estimator is proposed and analyzed. The proposed method is shown to outperform C/N0 estimators available in the literature.
- Published
- 2010
- Full Text
- View/download PDF
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