• Annals of Clinical Neurophysiology
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• v.13 no.2
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• pp.93-96
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• 2011

We present a recordings of 37-year-old woman with simultaneous ictal scalp and subdural electrodes. The ictal rhythm on subdural electrocorticography (ECoG) started earlier (median 24.5 sec) and ended later (median 2.0 sec) compared to ictal rhythm on scalp EEG. Eight ictal ECoG recordings were well localized to left temporal area, whereas ictal scalp EEG recordings were not. Our case shows the obvious timing relations between two recordings, and different electrophysiologic information about localization of ictal onset zone.

• Quality Improvement in Health Care
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• v.1 no.1
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• pp.110-118
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• 1994

As the first step to improve the medical recording for the hospitalized patients, we tried to identify problems of completion rate of the medical recording and made the completion rate of the medical recording within due date known to the public in the hospital and commended the best Department and resident officially. The results were as follows: 1. The average number of the medical recordings per a recorder by years of residency(average number to quorum) was 293.3(398.8) in 1st year, 82.5(68.1) in 2nd year, 21.2(8.3) in 3rd year, and 20.5(1.9) in 4th year-residents. There was only 2 residents who prepared the medical recordings more than the average of 125.6 recordings per a resident. 2. Among 13 Departments, the medical recording was wholly put in charge of the 1st year-resident in 6 Departments. The duty was shared with the 2nd year-resident in 5 Departments and the 3rd year-resident in 1 and the 4th year-resident in Only 1 Department. 3. The more the cases requiring the medical recording, the lower the completion rate(80% less than 100 recordings, 70% in 100-299, 60% in 300-399 and 33.3% in more than 400). 4. There was no difference in the completion rate of the medical recording before(1991) and after(1993) a public nitice(1992). However, 4 Departments showed improvement of 21-45% in the completion rate, and no case was found where billing for medical assurance was postponed due to delayed completion of the medical recording. 5. The completion rate was relatively low(72-78%) from January to March. The main reasons were shortage of men power due to preparation of board examination, attendance to military duty, and lack of training in the medical recording for the new 1st year-residents. 6. The official commendation of the best Department and resident by letters did not improve the completion rate of the medical recording. In conclusion, The main reason of the low completion rate of the medical recording was the fact that the 1st year-residents were almost exclusively responsible for the medical recording. Hence, it is mandotory that this practice gets staffs' attention to improve the completion rate. Public notice of the completion rate of the medical recording shows prompt improvement of the completion rate. Prize money rather than commendation by a letter for the best Department would also be more effective to improve the quality of medical recording.

• 제어로봇시스템학회:학술대회논문집
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• 2004.08a
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• pp.181-184
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• 2004

There are reports showing that electromagnetic fields (EMFs) emitted at non-thermal levels may be associated with biological alterations in target cells. In this study it is objected to assess the potential influences of EMFs produced by cellular phones on fetal heart rate. Non Stress Test (NST) is a widely used method of fetal monitoring and assessing fetal health and well-being. Sixty volunteers with uncomplicated term pregnancies were studied by a Spacelabs AM-67 Doppler ultrasound monitor. Fetal Heart Rate recordings were obtained while there were no Cellular Phone around for 10 minutes. Afterwards, all patients were exposed to EMFs for 10 minutes. NST was performed while they were holding the CP on stand-by mode and then on dialing mode, each for 5 minutes. The recordings were analyzed with respect to baseline heart rate, accelerations and decelerations. The Wilcoxon matched-pairs signed-ranks test was used to compare these variables. The results indicate that EMFs emitted by CP do not cause any demonstrable effects on baseline FHR, acceleration or deceleration.

• Journal of Preventive Medicine and Public Health
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• v.37 no.2
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• pp.182-189
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• 2004

Objectives : The objective of this study is to compare the circadian patterns of heart rate variability assessed by 24-hour ambulatory electrocardiographic (ECG) recordings during day shift and night shift among the workers in the 5 days-concecutive-12-hour shift in an automobile factory in Korea. Methods : The study population consisted 300 workers, who were randomly selected among the 8700 total workers in one car factory. To analyse circadian variation, the 24-hour ECG recordings (Marquette) were measured during day shift (08:00-20:00 h) and night shift (20:00-08:00 h). Analysis was performed for all time and frequency domain measures of HRV. 233 workers completed taking 24-hour ECG recordings. Results : This study shows that the 24 hourcircadian variation mainly follows work/sleep cycle rather than day/night cycle among shift workers. This study also shows that among the night shift, the circadian variation between work and sleep cycle decreased compared to the work/sleep cycle among day shift workers. All time and frequency domain parameters (except LF/HF ratio) show significantly different between work and sleep in the day shift and night shift. Conclusion : These changes in heart rate variability circadian rhythms reflect significant reductions in cardiac parasympathetic activity with the most marked reduction in normal vagal activity among the shift workers. Especially, it suggests the circadian rhytm has blunted among the night workers. The quantification of the circadian variation in HRV can be a surrogates of workers' potential health risk, as well as suggests possible mechanisms through which the shift works compromise workers' health.

• International Journal of Computer Science & Network Security
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• v.22 no.5
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• pp.127-134
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• 2022

Generally developed for medical testing, electrocardiogram (ECG) recordings seizure the cardiac electrical signals from the surface of the body. ECG study can consequently be a vital first step to support analyze, comprehend, and expect cardiac ailments accountable for 31% of deaths globally. Different tools are used to analyze ECG signals based on computational methods, and explicitly machine learning method. In all abovementioned computational simulations are prevailing tools for cataloging and clustering. This review demonstrates the different effective methods for heart disease based on computational methods for ECG analysis. The accuracy in machine learning and three-dimensional computer simulations, among medical inferences and contributions to medical developments. In the first part the classification and the methods developed to get data and cataloging between standard and abnormal cardiac activity. The second part emphases on patient analysis from entire ECG recordings due to different kind of diseases present. The last part represents the application of wearable devices and interpretation of computer simulated results. Conclusively, the discussion part plans the challenges of ECG investigation and offers a serious valuation of the approaches offered. Different approaches described in this review are a sturdy asset for medicinal encounters and their transformation to the medical world can lead to auspicious developments.

• Journal of Biomedical Engineering Research
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• v.26 no.4
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• pp.199-205
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• 2005

When recording single-unit responses from neural systems, a common problem is the accurate detection of spikes (action potentials) in the presence of competing unwanted (noise) signals. While some sources of noise can be readily dealt with through filtering or 'template subtraction' techniques, other sources present a more difficult problem. In particular, noise components introduced by power supplies, which contain harmonics of the power-line frequency, can be particularly troublesome in that they can mimic the shape of the desired spikes. Thus, standard 'template subtraction' techniques or notch-filtering approaches are not appropriate. In this study, we propose the use of a novel template-subtraction scheme that involves estimating the power-line noise waveform and using cross-correlation techniques to subtract them from the recordings. This technique requires two key steps: (1) cross-correlation analysis of each recorded waveform extracts a robust representation of the power-line noise waveform and (2) a second level of cross-correlation to successfully subtract that representation from each recorded waveform. This paper describes this algorithm and provides examples of its implementation using actual recorded waveforms that are contaminated with these noise signals. An improvement (reduction) in the noise level is reported, as are suggestions for future implementation of this strategy.

• Proceedings of the KOSOMBE Conference
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• v.1997 no.11
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• pp.31-34
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• 1997

A semiconductor microelectrode array has been successfully used in obtaining single unit recordings from medial giant nerve of clay fish, rat saphenous nerve and abdominal ganglia of aplysia. The recording device fabricated using silicon microfabrication techniques is a depth-probe type and, previously, has been mostly used to record from central nerve system of vertebrates. From invertebrates, and also from peripheral nerves of vertebrates, however, the quality of the recorded signal depends heavily on the recording conditions, such as the proximity of the electrode site to the nerve cells and the size of the neuron. We have modeled the signal to noise ratio as unctions of these parameters and compared the experimental data with the calculated values thus obtained.

• Proceedings of the PSK Conference
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• 2002.10a
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• pp.250.1-250.1
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• 2002

DA-8159. a selective inhibitor of phosphodiesterase type 5 (PDE5: IC$\sub$50/ 5ng/$m\ell$). is being developed as a new treatment for erectile dysfunction. Since DA-8159 has been shown to inhibit PDE6 enzyme (IC$\sub$53ng/$m\ell$). we evaluated the effect of DA-8159 on electroretinogram (ERG) and retinal histopathology in rabbits. The effect of oral DA-8159 (5 to 30mg/kg) on ERG recordings was investigated at pre-treatment. 1 and 5 hrs after administration in rabbits. (omitted)

• Proceedings of the Korean Biophysical Society Conference
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• 2002.06b
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• pp.38-38
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• 2002

Whole-cell recordings from adult rat sympathetic neurons demonstrate that calcium current is comprised of at least three types, N, L '||'&'||' R. We are using cell-attached patch recording to identify the single calcium channels that underlie these macroscopic currents. Single channels were resolved the presence of 100 mM Ba$\^$2＋/ and l${\mu}$M BayK 8644 over the voltage range -40 to $\^$＋/50 mV.(omitted)

• Proceedings of the KOSOMBE Conference
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• v.1997 no.11
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• pp.323-326
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• 1997

In this study, we investigated the circardian rhythm of complexity of cardiac dynamics in humans. Dynamic 24-hour electrocardiographic recordings were obtained from 30 healthy ambulant subjects aged 41 to 50 years. or each recordings, normalized low frequency (0.04-0.1 hertz) and high frequency (>0.15 hertz) component are calculated. our different indexes obtained from separate algorithms of nonlinear dynamics - approximate entropy, correlation dimension, Lyapunov exponent and fractal dimension - were calculated. During early morning, low frequency component rose rapidly with concomitant withdrawl of high frequency component. All the our indexes of nonlinear dynamics showed remarkably same circardian rhythm: an early morning dip preceded by a steep decline during late night, a gradual recovery during evening and a peak around midnight. These data indicate that the simultansous losses of all of the our different mechanisms of nonlinear control of heart rate during early morning, concomitent with the surge of symapathetic activity and reduction of vagal activity, may contribute to the increased incidence of cardiovascular events during morning hours.