scholarly journals PERBAIKAN CITRA SINYAL ECG DENGAN METODE FINITE IMPULS RESPONSE FILTERING

2020 ◽  
Vol 22 (2) ◽  
Author(s):  
Hadi Purwanto ◽  
S El Yumin
Keyword(s):  
Digital Filter ◽  
Medical Instrument ◽  
Processing System ◽  
Software Tool ◽  
P Wave ◽  
Reference Channel ◽  
Interference Filters ◽  
The Poor ◽  
Before And After ◽  
Reduction Effect

The ECG is a medical instrument which is required by the medical check to obtain information about the humancardiac work function. The interference filtering grid is very important in measuring the results of biomedicalrecordings, especially in recording the poor ECG sinyals. The interference filters are available to the grid requiresa reference channel or a predetermined frequency is 50/60Hz. The method of noise reduction effect on the entiresinyal processing system appearance elektrocardio graph (ECG), with fundamental frequency 5 Hz to 100 Hz.Development of FIR digital filter has a very important role in this research to be able to view the complete ECGsinyal, such as the P wave, T and QRS waves in a complex with a different duration and amplitude with the help of acomplete design created in Matlab. The results show that the ECG sinyal before and after filtering with thefrequency spectrum clearly shows the reduction of interference grid on ECG sinyal. Analysis of the ECG sinyalshow in peiodic R wave peak was 1.62 mV, followed by waves P, Q and T 0.24 mV, respectively, 24%, and 0.1 to0.5 mV. Design of FIR that is deliberately chosen as a topic in this research, because it is a key material in thesinyal processing using Matlab software tool.

TO STUDY THE EFFECT OF BMV ON P WAVE DISPERSION AND SHORT TERM PROGNOSTIC IMPACT OF P WAVE DISPERSION IN PREDICTION OF CLINICAL OUTCOME AFTER PERCUTANEOUS BALLOON MITRAL VALVULOPLASTY IN PATIENTS WITH MITRAL STENOSIS AND SINUS RHYTHM

2020 ◽  
Vol 4 (9) ◽  
Author(s):  
Ashish Kumar Agarwal ◽  
Daulat Singh Meena ◽  
Vijay Pathak ◽  
Anoop Jain ◽  
Rakesh Kumar Ola
Keyword(s):  
Clinical Outcome ◽  
Right Ventricular ◽  
Wave Dispersion ◽  
Tissue Doppler ◽  
P Wave ◽  
Short Term ◽  
P Wave Dispersion ◽  
Mitral Valvuloplasty ◽  
Percutaneous Balloon ◽  
Before And After

Background: The aim of the present study was to study the effect of percutaneous balloon mitral  valvuloplasty (PBMV) on P wave dispersion and to test the correlation between P-maximum and  P-dispersion to right ventricular function and pulmonary artery pressure before and after PMBV. Also to study the impact of P-maximum and P-wave dispersion on the short term clinical outcome after successful PBMV in patients with mitral stenosis (MS) and sinus rhythm. Methods: 75 patients undergoing PMBV were enrolled in this study. We evaluated P-maximum, P-minimum and P-wave dispersion before and one month and one year after PBMV . We studied the changes in pulmonary arterial pressure (PAP), left atrial (LA) dimension, mitral diastolic gradient, and mitral valve area, in addition to the changes in right ventricular function utilizing tissue Doppler assessment both before and after PMBV, in addition the role of the P-wave dispersion in prediction of late cardiac events. Results: There were significant decrease in mean diastolic gradient, PAP, and LA size and significant improvement in right ventricular tissue Doppler indices after PMBV. Accompany these hemodynamic changes after PMBV. P-maximum and P-wave dispersion were found to be decreased (P < 0.001). Conclusion: Successful PBMV was associated with a decrease in Pmax and PWD. These simple electrocardiographic indices may predict the success of the procedure immediately after PBMV.  The P-maximum and P-wave dispersion changes were correlated with significant impairment of right dysfunction and the degree of pulmonary artery pressure. Keywords: PBMV.PAP,LA

THREE‐DIMENSIONAL FILTERING WITH AN ARRAY OF SEISMOMETERS

Geophysics ◽  
1964 ◽  
Vol 29 (5) ◽  
pp. 693-713 ◽  
Author(s):  
John P. Burg
Keyword(s):  
Array Processing ◽  
Three Dimensional ◽  
Processing System ◽  
Seismic Signal ◽  
P Wave ◽  
Wave Number ◽  
Theoretical Problem ◽  
Least Mean Square ◽  
Optimum Frequency ◽  
Filtering Theory

The development of the Wiener linear least‐mean‐square‐error processing theory for seismic signal enhancement through use of a two‐dimensional array of seismometers leads to the theory of three‐dimensional filtering. The array processing system for this theory consists of applying individual frequency filters to the outputs of the seismometers in the array before summation. The basic design equations for the optimum frequency filters are derived from the Wiener multichannel theory. However, the development of the three‐dimensional frequency and vector‐wave‐number‐filtering theory results in a physical understanding of generalized linear array processing. The three‐dimensional filtering theory is illuminated by a theoretical problem of P‐wave enhancement in the presence of ambient seismic noise. An analysis of the results shows why optimum three‐dimensional filtering gives greater signal‐to‐noise ratio improvements than achieved by conventional array processing techniques.

Efficacy of endovascular intratumoral embolization for meningioma: assessment using dynamic susceptibility contrast-enhanced perfusion-weighted imaging

2021 ◽  
pp. neurintsurg-2020-017116
Author(s):  
Katsunori Asai ◽  
Hajime Nakamura ◽  
Yoshiyuki Watanabe ◽  
Takeo Nishida ◽  
Mio Sakai ◽  
...  
Keyword(s):  
Intracranial Meningioma ◽  
Preoperative Embolization ◽  
Dynamic Susceptibility ◽  
Dynamic Susceptibility Contrast ◽  
Perfusion Weighted Imaging ◽  
Contrast Enhanced ◽  
Before And After ◽  
Reduction Effect ◽  
Susceptibility Contrast ◽  
Bare Platinum Coils

BackgroundIn preoperative embolization for intracranial meningioma, endovascular intratumoral embolization is considered to be more effective for the reduction of tumorous vascularity than proximal feeder occlusion. In this study, we aimed to reveal different efficacies for reducing tumor blood flow in meningiomas by comparing endovascular intratumoral embolization and proximal feeder occlusion using dynamic susceptibility contrast-enhanced perfusion-weighted imaging (DSC-PWI).Methods28 consecutive patients were included. DSC-PWI was performed before and after embolization for intracranial meningiomas. Normalized tumor blood volume (nTBV) of voxels of interest of whole tumors were measured from the DSC-PWI data before and after embolization. ΔnTBV% was compared between the cases that received intratumoral embolization and proximal feeder occlusion.ResultsΔnTBV% in the intratumoral embolization group (42.4±29.8%) was higher than that of the proximal feeder occlusion group (15.3±14.3%, p=0.0039). We used three types of embolic materials and ΔnTBV% did not differ between treatments with or without the use of each material: 42.8±42.4% vs 28.7±20.1% for microspheres (p=0.12), 36.1±20.6% vs 28.1±41.1% for n-butyl cyanoacrylate (p=0.33), and 32.3±37.3% vs 34.1±19.0% for bare platinum coils (p=0.77).ConclusionsThe flow reduction effect of intratumoral embolization was superior to that of proximal feeder occlusion in preoperative embolization for intracranial meningioma in an assessment using DSC-PWI.

scholarly journals A Novel Optical Bioimaging Method for Direct Assessment of Ovarian Cancer Chemotherapy Response at Laparoscopy

2016 ◽  
Vol 15 ◽  
pp. CIN.S40660 ◽  
Author(s):  
Alexandros Laios ◽  
Davide Volpi ◽  
Rajeev Kumar ◽  
Zoe Traill ◽  
Borivoj Vojnovic ◽  
...  
Keyword(s):  
Ovarian Cancer ◽  
Unit Length ◽  
Evaluation Criteria ◽  
Advanced Ovarian Cancer ◽  
Software Tool ◽  
Lesion Size ◽  
Chemotherapy Response ◽  
Direct Assessment ◽  
Before And After ◽  
Image Pixels

In patients with advanced ovarian cancer (AOC), additional imaging of disseminated disease at laparoscopy could complement conventional imaging for estimation of chemotherapy response. We developed an image segmentation method and evaluated its use in making accurate and objective measurements of peritoneal metastases in comparison to Response Evaluation Criteria In Solid Tumors (RECIST) criteria. A software tool using a custom ImageJ macro-based approach was employed to estimate lesion size by converting image pixels into unit length. The software tool was tested as a proof-of-principle in an AOC patient with two isolated peritoneal deposits. Image analysis of representative laparoscopic snapshots before and after three cycles of neoadjuvant chemotherapy (NACT) revealed an average tumor nodule response ratio (TNRR) of 40% (partial response), which was in concordance with RECIST evaluation by computed tomography (CT). We demonstrated the feasibility of using this novel anatomical analysis for direct assessment of chemotherapy response in an AOC patient as an adjunct to RECIST criteria.

scholarly journals Studies on the disinfection efficiency of hoa sen medical instrument sterilizing equipment at the general, obstetrics and paediatrics hospitals in TraVinh Province

2019 ◽  
Vol 41 (3) ◽  
Author(s):  
Pham Hoang Long ◽  
Nguyen Hoai Chau ◽  
Nguyen Chi Thanh ◽  
Ngo Quoc Buu
Keyword(s):  
Cell Membrane ◽  
Removal Efficiency ◽  
Medical Instrument ◽  
Culture Method ◽  
Aerobic Bacteria ◽  
Bacterial Cells ◽  
E Coli ◽  
Before And After ◽  
Microbiological Criteria ◽  
Bacterial Cell Membrane

This research aims to study on the disinfection efficiency of Hoa Sen medical instrument sterilizing equipment based on the application of ECA technology at General Hospital and Obstetrics and Paediatrics Hospitals in Tra Vinh. Disinfection using ECA technology is a method that does not require the introduction of special oxidizing agents except of water and salt. ECA solution - Anolyte solution has very strong oxidants, which oxidize components such as protein, lipid, etc. (usually of the bacterial cell membrane) that make the cell membrane decomposed, reducing 77−93% of the respiratory ability of bacterial cells, weakening them and eventually being destroyed. Hoa Sen medical instrument sterilizing equipment has a similar construction form as a regular double washing table with two wash basins, wherein one sink with a faucet which produces purified water, while other one has a faucet that gives anolyte solution for sterilization. Both faucets are based on a touch support. At the bottom of the sink an anolyte solution production system was installed. Valorization of the disinfection ability of the Hoa Sen medical instrument sterilizing equipment was based on the determination of the number of microorganisms on the surface of the instrument before and after being soaked with an antiseptic washing table. Microbiological criteria are the number of aerobic bacteria, E. Coli and Coliforms. Analytical samples were quantified by culture method on agar plates. Analysis of total aerobic bacteria, E. Coli and Coliforms bacteria according to Vietnam Standard TCVN 4884:2015, TCVN 6846:2007 and TCVN 6848:2007, respectively. The results showed that bacterial removal efficiency was elevated with a novel Hoa Sen sterilizing equipment anolyte. In laboratory scale, E. Coli and Coliforms bacteria with a density of 105 CFU/mL were completely removed in 30 sec contact with an anolyte solution of 300 mg/L active chlorine concentration. In hospital scale, the removal efficiency of total aerobic bacteria on the surface of medical instruments after surgery was 99% for one minute disinfection time. For E. Coli and Coliforms bacteria, the results of the analysis were not detected in both cases before and after sterilization. 

Design and simulation of Helmholtz resonator assembly used to attenuate tire acoustic cavity resonance noise

2021 ◽  
Vol 263 (6) ◽  
pp. 942-953
Author(s):  
Wei Zhao ◽  
Xiandong Liu ◽  
Yingchun Shan ◽  
Tian He
Keyword(s):  
Natural Frequencies ◽  
Helmholtz Resonator ◽  
Operating Conditions ◽  
Cavity Resonance ◽  
Frequency Range ◽  
Sound Fields ◽  
Acoustic Cavity ◽  
The Poor ◽  
Alloy Wheel ◽  
Reduction Effect

Tire acoustic cavity resonance noise (TACRN) is a typical annoying lower-frequency interior noise of a passenger car. The widely used attenuating method of attaching the porous sound absorption material in tire cavity can reduce TACRN effectively, but causes the increase of tire-wheel assembly weight and cost, also the poor durability. Additionally, the Helmholtz resonator (HR) is also used in the wheel of some cars although having only narrow effective band. The existing investigation shows that the frequency of TACRN varies with the car speed and load and also has the split characteristics. The change of TACRN frequency causes a certain difficulty to suppress TACRN effectively. Aiming at this problem, in this paper, TACRN frequency range of a specific tire cavity under different operating conditions is first calculated and analyzed. Then, for a specific aluminum alloy wheel, a HR assembly including several HRs is designed to make the natural frequencies of HR assembly cover the TACRN frequencies. Finally, the reduction effect of TACRN is simulated and evaluated by comparing the sound fields in tire cavity with/without HR assembly under same volume velocity sound source. This work is helpful for attenuating TACRN effectively under the changing operating conditions.

Abstract 2023: Effect Of Chronic Stretch Reversal On Atrial Remodeling In Humans: Implications For The Atrial Fibrillation Substrate

Circulation ◽  
2007 ◽  
Vol 116 (suppl_16) ◽  
Author(s):  
Bobby John ◽  
Martin K Stiles ◽  
Sunil T Chandy ◽  
Pawel K Kuklik ◽  
Glenn D Young ◽  
...  
Keyword(s):  
Atrial Fibrillation ◽  
Important Determinant ◽  
P Wave ◽  
Atrial Remodeling ◽  
Conduction Time ◽  
Atrial Arrhythmias ◽  
Wave Duration ◽  
P Wave Duration ◽  
Before And After ◽  
Mitral Commissurotomy

Background : Chronic atrial stretch is an important determinant for atrial fibrillation (AF). Whether relief of stretch reverses the substrate predisposed to AF is unknown. Methods: Twenty one pts (31±9 years) with mitral stenosis (MS; MVA 0.89±0.1cm 2 ) undergoing mitral commissurotomy (MC) were studied by electrophysiological or electroanatomical mapping of both atria before and after MC. Multipolar catheters were placed in the lateral RA, Crista (CT), coronary sinus (CS), septal RA and LA. We measured: effective refractory period (ERP) at the LA appendage, septal/lateral LA roof, posterior LA, inferior LA, proximal/distal CS, low/high LRA and SRA at 600 and 450ms; P wave duration (PWD); double potentials (DP) or fractionated signals (FS) along CT; and conduction time along CS, LRA, inferior LA and LA roof. Activation and voltage maps were created to evaluate changes in conduction and voltage. In 14 pts, RA studies were repeated ≥6 months after MC. Results : Following MC, there was significant increase in MVA (2.1±0.3 cm 2, p<0.0001) with decrease in LA (23±8 to 10±4 mmHg, p<0.0001) and PA pressures (38±17 to 27±14mmHg, p<0.0001) and LA volume (75±12 to 52±13ml, p<0.0001). This was associated with no change in ERP and No. of DP/FS along the CT but with reduction in PWD (139±19 to 135±20ms, p=0.047), increase in conduction velocity (CV) in LA (1.3±0.3 to 1.7±0.2m/s, p=0.005) and RA (1.0±0.1 to 1.3±0.3 m/s, p=0.007) and increase in LA voltage (1.7±0.6 to 2.5±1.0 mV, p=0.05). Late after MC, there was a further decrease in PWD and RA ERP, with increase in RA CV (1.0±0.1 to 1.3±0.2 m/s, p=0.01) and voltage (1.7±0.7 to 2.8±0.6 mV, p=0.004) but with no change in other parameters. See table for details of pts studied late after MC. Conclusion: The electrophysiologic and electroanatomic abnormalities within the atria that result from MS are reversed after MC. These observations suggest that the substrate predisposing to atrial arrhythmias may be reversed. Results

Growing up in Hong Kong before and after 1980

2017 ◽  
Author(s):  
Yue Chim Richard Wong
Keyword(s):  
Social Mobility ◽  
Rental Housing ◽  
Growing Up ◽  
The Poor ◽  
Public Rental Housing ◽  
Before And After ◽  
Upward Social Mobility ◽  
Poor Children ◽  
Housing Estates ◽  
Housing Units

Hong Kong’s public housing estates are transforming into areas of growing poverty, with more divorced households. They are increasingly weak neighborhoods for motivating children to higher aspirations. There are doubts about the wisdom of continuing the development of more public rental housing units to solve our shortage of housing units. A far better solution is to build subsidized homes for ownership so that families have a stake to stay together and work for a better future. By keeping families together, more children will be prevented from falling into a state of disadvantage that will be detrimental to their future upward social mobility. Why foster and concentrate the poor and the divorced in publicly subsidized ghettos? Poor children deserve a better deal. A city of homeowners is also less politically divided.

scholarly journals Determination of vp/vs on Bali Province: Case of Bali Earthquake March 22, 2017

2018 ◽  
Vol 19 (2) ◽  
pp. 73
Author(s):  
Febi Niswatul Auliyah ◽  
Komang Ngurah Suarbawa ◽  
Indira Indira
Keyword(s):  
Case Studies ◽  
Wave Velocity ◽  
P Wave ◽  
S Wave ◽  
Diagram Method ◽  
P Wave Velocity ◽  
Before And After ◽  
Earthquake Data

P-wave velocity and S-wave velocity have been investigated in the Bali Province by using earthquake case studies on March 22, 2017. The study was focused on finding out whether there were anomalies in the values of vp/vs before and after the earthquake. Earthquake data was obtained from the Meteorology, Climatology and Geophysics Agency (BMKG) Region III Denpasar, which consisted of the main earthquake on March 22, 2017 and earthquake data in August 2016 to May 2017. Data was processed using the wadati diagram method, obtained that the vp/vs on SRBI, IGBI, DNP and RTBI stations are shifted from 1.5062 to 1.8261. Before the earthquake occurred the anomaly of the value of vp/vs was found on the four stations, at the SRBI station at 10.35%, at the IGBI station at 16.16%, at DNP station at 12.27% and at RTBI station at 4.62%.

Atrioventricular conduction abnormalities and atrioventricular blocks: ECG patterns and diagnosis

2018 ◽  
Author(s):  
S. Serge Barold
Keyword(s):  
P Wave ◽  
Conduction Time ◽  
Type I ◽  
Type Ii ◽  
Av Block ◽  
Ventricular Extrasystoles ◽  
Av Conduction ◽  
Pr Interval ◽  
Before And After ◽  
Second Degree

The diagnosis of first-degree and third-degree atrioventricular (AV) block is straightforward but that of second-degree AV block is more involved. Type I block and type II second-degree AV block are electrocardiographic patterns that refer to the behaviour of the PR intervals (in sinus rhythm) in sequences (with at least two consecutive conducted PR intervals) where a single P wave fails to conduct to the ventricles. Type I second-degree AV block describes visible, differing, and generally decremental AV conduction. Type II second-degree AV block describes what appears to be an all-or-none conduction without visible changes in the AV conduction time before and after the blocked impulse. The diagnosis of type II block requires a stable sinus rate, an important criterion because a vagal surge (generally benign) can cause simultaneous sinus slowing and AV nodal block, which can resemble type II block. The diagnosis of type II block cannot be established if the first post-block P wave is followed by a shortened PR interval or by an undiscernible P wave. A narrow QRS type I block is almost always AV nodal, whereas a type I block with bundle branch block barring acute myocardial infarction is infranodal in 60–70% of cases. All correctly defined type II blocks are infranodal. A 2:1 AV block cannot be classified in terms of type I or type II block, but it can be AV nodal or infranodal. Concealed His bundle or ventricular extrasystoles may mimic both type I or type II block (pseudo-AV block), or both

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