scholarly journals A Review on Feature Extraction Techniques of Photoplethysmogram Signal

2020 ◽  
pp. 380-383
Author(s):  
Sree Sanjanaa Bose S ◽  
Sree Niranjanaa Bose S ◽  
Maniventhan M
Keyword(s):  
Feature Extraction ◽  
Blood Volume ◽  
Pulse Rate ◽  
Peripheral Blood ◽  
Extraction Techniques ◽  
Non Invasive ◽  
Invasive Method ◽  
Ectopic Beats ◽  
Vital Parameters

Photoplethysmography (PPG) signal has been used widely for detection of pulse rate from peripheral blood volume. PPG is a novel non-invasive method with the advantage of convenience and accuracy. The dichrotic notches, ectopic beats and apertures are the prominent features that can be extracted from PPG signal for computing different physiological vital parameters. In this paper, we have discussed various feature extraction techniques.

scholarly journals Comparison Analysis of GLCM and PCA on Parkinson's Disease Using Structural MRI

2022 ◽  
Vol 12 (1) ◽  
pp. 1-15
Author(s):  
Sanjana Tomer ◽  
Ketna Khanna ◽  
Sapna Gambhir ◽  
Mohit Gambhir
Keyword(s):  
Feature Extraction ◽  
Principal Component ◽  
Structural Mri ◽  
Dopamine Neurons ◽  
Motor Symptoms ◽  
Non Invasive ◽  
Invasive Method ◽  
Occurrence Matrix ◽  
Time Motor ◽  
Non Motor Symptoms

Parkinson disease (PD) is a neurological disorder where the dopaminergic neurons experience deterioration. It is caused from the death of the dopamine neurons present in the substantia nigra i.e., the mid part of the brain. The symptoms of this disease emerge slowly, the onset of the earlier stages shows some non-motor symptoms and with time motor symptoms can also be gauged. Parkinson is incurable but can be treated to improve the condition of the sufferer. No definite method for diagnosing PD has been concluded yet. However, researchers have suggested their own framework out of which MRI gave better results and is also a non-invasive method. In this study, the MRI images are used for extracting the features. For performing the feature extraction techniques Gray Level Co-occurrence Matrix and Principal Component Analysis are performed and are analysed. Feature extraction reduces the dimensionality of data. It aims to reduce the feature of data by generating new features from the original one.

Preoperative perfusion index as a predictor of post-anaesthetic shivering in caesarean section with spinal anaesthesia

2021 ◽  
pp. 175045892097926
Author(s):  
Mukri P Nasution ◽  
Mariza Fitriati ◽  
Anna S Veterini ◽  
Prihatma Kriswidyatomo ◽  
Arie Utariani
Keyword(s):  
Blood Flow ◽  
Caesarean Section ◽  
Spinal Anaesthesia ◽  
Peripheral Blood ◽  
Elective Caesarean Section ◽  
Perfusion Index ◽  
Peripheral Blood Flow ◽  
Non Invasive ◽  
Flow Perfusion ◽  
Invasive Method

Background Post-anaesthetic shivering is frequently preceded by a decrease in peripheral blood flow. Perfusion index is a fast non-invasive method to assess peripheral blood flow, thus might be correlated with post-anaesthetic shivering. Aim To analyse the relationship between preoperative perfusion index and post-anaesthetic shivering in patients undergoing caesarean section with spinal anaesthesia. Methods In this prospective observational study, preoperative perfusion index measurements were performed on 40 participants who were undergoing elective caesarean section under spinal anaesthesia. Spinal anaesthesia was performed using Lidodex (Lignocaine + Dextrose 5%) at vertebrae L4–L5 or L3–L4 interspace. Shivering was observed until 120 minutes according to the Crossley and Mahajan scale. Statistical analysis was performed to examine the correlation and cut-off of preoperative perfusion index as a predictor for post-anaesthetic shivering. Result There was a significant relationship between preoperative perfusion index with the incidence ( p = 0.005) and the degree ( p = 0.014) of post-anaesthetic shivering. The preoperative perfusion index cut-off value based on the ROC curve was 4.2 (AUC = 0.762, p = 0.002) with a sensitivity of 73.9% and specificity of 88.2%. Participants with preoperative PI < 4.2 had a greater risk of post-anaesthetic shivering ( p < 0.001, RR = 3.13). Conclusion Preoperative perfusion index less than 4.2 can predict post-anaesthetic shivering in patients undergoing caesarean section with spinal anaesthesia.

scholarly journals OBTAINING THE PHYSIOLOGICAL DATA USING THE PHOTOPLETHYSMOGRAPHIC METHOD

2018 ◽  
Vol 6 ◽  
pp. 881-886
Author(s):  
Krasimir Cheshmedzhiev ◽  
Galya Georgieva-Tsaneva
Keyword(s):  
Cardiovascular System ◽  
Blood Vessels ◽  
Blood Volume ◽  
Pulse Rate ◽  
Personal Computer ◽  
Infrared Light ◽  
Physiological Data ◽  
Light Emitting ◽  
Non Invasive ◽  
The Individual

The activity of the cardiovascular system is very important for the overall health of a human being. The Photoplethysmographic method is an effective tool of assessing the activity of the heart. The method is based on recording changes in blood volume in the blood vessels of the individual. The report presents a non-invasive way to obtain physiological data using a created device based on the Photoplethysmographic method. The created device consists of a photodetector, infrared light-emitting diodes, and small pulse rate sensors. The proposed portable device has been tested with three types of interfaces. The received data from the Photoplethysmographic device is transmitted to a personal computer and stored for further processing.

scholarly journals Relative peripheral blood volume changes induced by premature ectopic beats and their role in hemodialysis

2017 ◽  
Vol 31 ◽  
pp. 524-528
Author(s):  
Eglė Grigonytė ◽  
Eduardo Gil ◽  
Pablo Laguna ◽  
Leif Sörnmo
Keyword(s):  
Blood Volume ◽  
Peripheral Blood ◽  
Volume Changes ◽  
Ectopic Beats

Malfunctional Reorganization in the Developing Limbo-Prefrontal System in Animals: Implications for Human Psychoses?

2001 ◽  
Vol 12 (1) ◽  
pp. 8-14
Author(s):  
Gertraud Teuchert-Noodt ◽  
Ralf R. Dawirs
Keyword(s):  
Prefrontal Cortex ◽  
Mental Disorders ◽  
Dentate Gyrus ◽  
Cognitive Functions ◽  
Experimental Approach ◽  
Regulatory Mechanisms ◽  
Hippocampal Dentate Gyrus ◽  
Non Invasive ◽  
Invasive Method ◽  
Activity Dependent

Abstract: Neuroplasticity research in connection with mental disorders has recently bridged the gap between basic neurobiology and applied neuropsychology. A non-invasive method in the gerbil (Meriones unguiculus) - the restricted versus enriched breading and the systemically applied single methamphetamine dose - offers an experimental approach to investigate psychoses. Acts of intervening affirm an activity dependent malfunctional reorganization in the prefrontal cortex and in the hippocampal dentate gyrus and reveal the dopamine position as being critical for the disruption of interactions between the areas concerned. From the extent of plasticity effects the probability and risk of psycho-cognitive development may be derived. Advance may be expected from insights into regulatory mechanisms of neurogenesis in the hippocampal dentate gyrus which is obviously to meet the necessary requirements to promote psycho-cognitive functions/malfunctions via the limbo-prefrontal circuit.

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