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4 results on '"A., Arivazaghan"'

1. Automated lateralization of temporal lobe epilepsy with cross frequency coupling using magnetoencephalography

Author

Gautham, Bhargava K., Mukherjee, Joydeep, Narayanan, Mariyappa, Kenchaiah, Raghavendra, Mundlamuri, Ravindranadh C, Asranna, Ajay, Lakshminarayanapuram, Viswanathan G., Bharath, Rose D., Saini, Jitender, Nagaraj, Chandana, Mangalore, Sandhya, Kulanthaivelu, Karthik, Sadashiva, Nishanth, Mahadevan, Anita, Rajan, Jamuna, Kumar, Keshav, Arimappamagan, Arivazaghan, Malla, Bhaskara R., and Sinha, Sanjib

Published
2022
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2. Derivation, External Validation and Clinical Implications of a deep learning approach for intracranial pressure estimation using non-cranial waveform measurements

Author

Gulamali, Faris, primary, Jayaraman, Pushkala, additional, Sawant, Ashwin S., additional, Desman, Jacob, additional, Fox, Benjamin, additional, Chang, Annie, additional, Soong, Brian Y., additional, Arivazaghan, Naveen, additional, Reynolds, Alexandra S., additional, Duong, Son Q, additional, Vaid, Akhil, additional, Kovatch, Patricia, additional, Freeman, Robert, additional, Hofer, Ira S., additional, Sakhuja, Ankit, additional, Dangayach, Neha S., additional, Reich, David S., additional, Charney, Alexander W, additional, and Nadkarni, Girish N., additional

Published
2024
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3. Intentional Insertion of Air to Predict the Diagnostic Accuracy of Stereotactic Biopsy and a Uniform Grading System for Reporting.

Author

Deora, Harsh, Nadeem, Mohammed, Shashidhar, Abhinith, A., Arivazaghan, and Rao, Malla Bhaskara

Subjects
COMPUTED tomography, HISTOPATHOLOGY, BIOPSY, CATHETERS, STEREOTAXIC techniques, DIAGNOSIS
Abstract

Background and Objectives: Stereotactic biopsies are a relatively safe and reliable way of tissue diagnosis and characterization of eloquent area lesions/neoplasm. However, predicting the accuracy of the site of biopsy with the desired/planned site is not always possible. We describe a technique to identify the precise location of the biopsy site in the post-operative computed tomography (CT) scan using the injection of a low volume of air into the biopsy cannula. Methods: Hundred consecutive biopsies were performed in 80 adults/20 children (59 males/41 females, median age 51 years) over 3 years, consisting of 75 frameless and 25 frame-based stereotactic biopsies. After the biopsy specimens had been collected, a small volume of air (median 1 cc) was injected into the site. Post-operative CT was done within 4 hours of the biopsy to see the site of the air bubble, and the same was correlated with the histopathological accuracy. Results: Intra-cranial air in the selected target was present in 95 patients (Grade 1 and 2), while the air was seen in the track (Grade 3) in 3% and at an unrelated site (Grade 4) in 2% of cases. Both Grade 4 biopsies were negative on histopathology (diagnostic yield = 98%). Two negative biopsies were reported, which were both predicted with the Grade 4 biopsy. The grading allowed uniform reporting across series and eliminated the chance of upgrading/downgrading the report due to wrong site sampling within the lesion/neoplasm. Conclusion: The air-injection manoeuvre proposed for use in stereotactic biopsies of intra-cranial mass lesions is a safe and reliable technique that allows the exact biopsy site to be located without any related complications. [ABSTRACT FROM AUTHOR]

Published
2024
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4. Automated lateralization of temporal lobe epilepsy with cross frequency coupling using magnetoencephalography

Author

Jamuna Rajan, Keshav J. Kumar, Mariyappa Narayanan, Sandhya Mangalore, Karthik Kulanthaivelu, Rose Dawn Bharath, Arivazaghan Arimappamagan, Joydeep Mukherjee, Ravindranadh Chowdary Mundlamuri, Raghavendra Kenchaiah, Anita Mahadevan, Ajay Asranna, Bhargava Gautham, Sanjib Sinha, Nishanth Sadashiva, Jitender Saini, Viswanathan G. Lakshminarayanapuram, Bhaskara Rao Malla, and Chandana Nagaraj

Subjects
medicine.medical_specialty, Cross frequency coupling, Video eeg, medicine.diagnostic_test, Resting state fMRI, business.industry, Biomedical Engineering, Health Informatics, Feature selection, Magnetoencephalography, Audiology, medicine.disease, behavioral disciplines and activities, Lateralization of brain function, Temporal lobe, Epilepsy, Signal Processing, Medicine, business
Abstract

Objective Lateralization of seizure focus in temporal lobe epilepsy (TLE) is a prime step in pre-surgical evaluation requiring prolonged seizure monitoring using video EEG and manual inspection of recordings. This study uses phase amplitude coupling (PAC) in resting state magnetoencephalography to automatically lateralize TLE focus. Methods Fifty-four patients with drug resistant TLE and 21 healthy controls who underwent MEG were considered for the study. Classification was carried out for PAC calculated for source transformed resting state of controls vs left TLE (LTLE)/right TLE (RTLE) and LTLE vs RTLE between beta, low-gamma and high-gamma as high frequency (HF) bands and low frequency (LF) 1–13 Hz, with decision tree (DT), support vector machines (SVM) and naive Bayes with feature selection by chi-square test. Further, lateralization classification was also calculated with LF sub-bands (delta, theta, alpha). Results PAC was higher in the TLE compared to controls. LTLE and RTLE showed differences in low gamma-alpha and high gamma-delta coupling (p Conclusions PAC shows distinct patterns of coupling in each subject group. Feature selection showed involvement of major network hubs and resting state networks. SVM showed best classification potential in the low gamma band. Significance PAC in resting state MEG can supplement pre-surgical evaluation in drug resistant TLE.

Published
2022

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