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At least 181 records · Page 10Linked to original sources
PubMedDate not supplied

[Recording of ventricular pressure by conventional catheter manometer systems. I. Minimal requirements of blood pressure recording systems and estimation of frequency response characteristics].

Parallel recordings of pressure pulses by conventional catheter manometer systems and catheter tip manometer demonstrate severe errors in the peak velocity of pressure rise estimated by conventional systems. This fact is due to inadequate dynamic response characteristics of conventional systems in relation to the frequency content of pressure curves. During cardiac rest the error in dp/dt max is less than 10% if the frequency response of the recording system is uniform up to 10 Hz, the corresponding value under maximal cardiac stimulation is about 40 Hz. This is equal to the first 10 harmonics of heart rate. The examination of left and right ventricular pressure curves leads to similar results. The experimental determination of dynamic response characteristics of cathermanometer systems requires a test system producing suitable sinus or step functions, parallel high fidelity recording of pressure functions to be recommended. A simple test station is described. Examinations of temperature influence on catheter material and resulting changes in dynamic response characteristics were carried out. The incubation of catheters at the temperature of 37 degrees C is indispensable. A new diagram for simplifying the interpretation of results is described. Other publications are discussed in viewpoint of employed techniques and representation of results.

Blood Pressure Determination↗
PubMed2003

Statistical mapping of scalp-recorded ictal EEG records using wavelet analysis.

PURPOSE: The wavelet transform (WT) is well suited for the analysis of signals whose characteristics vary rapidly over time. We devised a computerized method for objective scoring of scalp-recorded seizures that takes advantage of the WT. METHODS: Using wavelet coefficients as a metric, we devised a statistical scoring method aimed at detecting significant and sustained rhythmic buildup. The approach was used to create spatiotemporal significance maps for each seizure. Each seizure was also independently analyzed by computer and an expert reader not involved in the clinical workup or computer analysis of these patients. Hierarchical decision rules for determining seizure lateralization and localization were established from a training set of seizures and subsequently tested on those from an independent test set of seizures. The test dataset included a total of 57 scalp-recorded seizures from 18 patients, each with a > or =12-month seizure-free surgical outcome. RESULTS: Validation was determined by the site of surgical resection. Of the 57 seizure records in the test dataset, the computerized approach resulted in 48 correctly lateralized seizures as compared to 34 for the expert reader. Further, the computer correctly localized 41 seizures to the expert's 31. CONCLUSIONS: The method presented appears to provide an objective basis for the intrachannel scoring of ictal EEGs with minimal interference from artifacts and intermittent discharges. Although the approach has so far shown a substantial improvement over expert scoring in estimating the lateralization and locus of seizure onset, further testing is required to fully evaluate fully its diagnostic accuracy.

Brain Mapping↗
PubMed1998

Correction of pressure waveforms recorded by fluid-filled catheter recording systems: a new method using a transfer equation.

BACKGROUND: Pressure measuring systems using fluid-filled catheters can result in the recording of distorted pressure waveforms. It results in phase delay, overestimation of systolic and, to a lesser extent, of diastolic pressure. We designed and evaluated a method to correct this pressure waveform distortion using an appropriate transfer equation obtained from the dynamic response of the fluid-filled catheter. This transfer equation is based on the principle that a fluid-filled catheter recording system is considered as an underdamped dynamic system fully characterized by its natural frequency (omega n) and damping ratio (zeta). METHODS: Pressure waveforms, simultaneously recorded in vitro or in vivo by a fluid-filled catheter (Pc) and a micromanometer-tipped catheter (Pref), were used to validate the method. Dynamic response of the catheter used was obtained from a fastflush test. The corrected signal (Ppred) was obtained using omega n, zeta and the following transfer equation: d2Pc/dt2 + 2 omega n zeta dPc/dt + omega n 2Pc = C Ppred (t) After correction of Pc, Ppred was compared, using a linear regression, with Pref taken as reference. RESULTS: Our results showed that Ppred was fitted to Pref with excellent coefficient correlation (0.99). The mean error and the standard error of estimate were respectively -1.16 mmHg and 1.4 mmHg. CONCLUSION: This new method can convert the distorted pressure waveforms transmitted by any fluid-filled catheters into high-fidelity signals. It suppresses the phase delay and the over-estimation of systolic pressure induced by fluid-filled catheters.

Animals↗
PubMed1994

Sympathetic skin response recorded by 4 channel recording system.

The main purpose of this article is to determine a method of supporting the sympathetic skin response (SSR) as a sensitive clinical test. Using a non-invasive technique the SSRs are simultaneously recorded by 4 channel EMG machine. Thirty adults (10 women and 20 men, aged 19 to 46 years), normal and healthy, participated in this experiment. Not only did the latencies recorded on both palms respond faster than those on both soles, but the amplitudes measured on the palms were also higher. From these observations, one is bound to conclude that the SSR is not a segmental response but a long systemic response. More than two channel EMG recordings are desirable to see whether or not there is a lesion in any part of the SSR's pathway. Comparing the SSRs made both on the palms and soles simultaneously is recommendable in order to increase the its sensitivity.

Adolescent↗
PubMed1990

Privacy Act of 1974; systems of records--HCFA. Deletion of Privacy Act System of Records from HCFA Inventory.

On August 21, 1989, HCFA published a notice of a new Privacy Act system of records, "Drug Bill Processor Records on Medicare Prescription Drug Beneficiaries," HHS/HCFA/BPO No. 09-70-0528 (54 FR 34612). This was under the authority of section 1842(o)(4) of the Social Security Act as amended by the Medicare Catastrophic Coverage Act (MCCA) of 1988 (Pub. L 100-360). This system was established to enable HCFA to collect and maintain records on Medicare prescription drug benefits for Medicare beneficiaries. Because the MCCA was repealed by the Congress, we are hereby giving notice that we are deleting this system from our inventory as required by the Privacy Act and Office of Management and Budget guidelines.

Centers for Medicare and Medicaid Services, U.S.↗
PubMed1982

Privacy Act of 1974; annual publication of systems of records--NIH. Privacy Act; annual republication of notices systems of records.

The National Institutes of Health (NIH) is publishing this document to meet the requirement of the Privacy Act (5 U.S.C. 552a(3)(4)) to publish a notice describing the existence and character of each system of records at least once a year. This publication covers systems of records for which NIH is responsible. This publication includes notices for new systems of records which have been published since the 1981 annual compilation. In addition, many of the notices which were published in the last annual publication have been modified to clarify the descriptions and to ensure that they are complete, accurate and timely. None of these changes requires a report of altered system to be sent to the Congress and the Office of Management and Budget. The notices are complete and accurate as of August 13, 1982.

Civil Rights↗
PubMed1984

Privacy Act of 1974; system of records--PHS. Notification of establishment of a new Privacy Act system of records.

5n accordance with the requirements of the Privacy Act, the Public Health Service (PHS) is publishing notice of a proposal to establish a new Privacy Act system of records: 09-20-0162, "Records of Subjects in Agent Orange, Vietnam Experience, and Selected Cancers Studies, HHS/CDC/CEH." We are also proposing routine uses for this system. The Center for Environmental Health (CEH), Centers for Disease Control (CDC), will use this system of records to support studies of the health effects of human exposure to the herbicide Agent Orange and to other environmental factors associated with service in Vietnam, and to assess the risks for selected cancers among Vietnam veterans. PHS invites interested persons to submit comments on the proposed routine uses on or before July 30, 1984.

Animals↗
PubMed1986

Health Care Financing Administration. Privacy Act of 1974; proposed amendment to systems of records--HCFA. Notice of proposed new routine: use for existing systems of records.

The Health Care Financing Administration (HCFA) is amending systems notices for (1) Carrier Medicare Claims Records, HHS/HCFA/BPO No. 09-70-0501; (2) Health Insurance Master Record, HHS/HCFA/BPO No. 09-70-0502; and (3) Intermediary Medicare Claims Records, HHS/HCFA/BPO no. 09-70-0503, to add a new routine use which will enhance our capability for identifying Medicare secondary payer situations where Medicare can assume a position of reduced liability due to the presence of other insurers.

Centers for Medicare and Medicaid Services, U.S.↗
PubMed1989

Privacy Act of 1974; systems of records--HCFA. Notice of proposed new routine uses for existing systems of records.

One of the top priorities of the Department of Health and Human Services is to assure high quality and effective health care while pursuing strategies to contain or moderate health care costs and Medicare program expenditures. One such program to limit Medicare programs expenditures was the Medicare Secondary payer (MSP) provisions (42 U.S.C. 1395y(b)). The purpose of this routine use is to enable HCFA and other "entities responsible for payment" to engage in exchanges of information concerning primary or secondary responsibility for a Medicare beneficiary's health care expenses. This notice is not the basis for a mandatory reporting requirement for "entities responsible for making payment" as required by 42 U.S.C. 1395y(b). Currently no statute mandates this type of exchange of information, therefore, these exchanges of information are strictly voluntary. The Health Care Financing Administration (HFCA) is amending systems notices for (1) Carrier Medicare Claims Records HHS/HCFA/BOP No. 09-70-0501; (2) Health Insurance Master Record HHS/HCFA/BOP No. 09-70-0502 and (3) Intermediary Medicare Claims Records HHS/HCFA/BPO No. 09-70-0503, to add a new routine use. The proposed routine use will enhance our capability for identifying Medicare Secondary payer situations where Medicare can assume a position of reduced liability due to the presence of other entities responsible for making primary payment in accordance with 42 U.S.C. 1395y(b).

Centers for Medicare and Medicaid Services, U.S.↗
PubMed1990

Record linkage: statistical models for matching computer records.

"We wish to measure the evidence that a pair of records relates to the same, rather than different, individuals. The paper emphasizes statistical models which can be fitted to a file of record pairs known to be correctly matched, and then used to estimate likelihood ratios. A number of models are developed and applied to U.K. immigration statistics. The combination of likelihood ratios for possibly correlated record fields is discussed." A series of comments on the paper is also included, as well as a reply to those comments by the author (pp. 312-20).

Data Collection↗
PubMed1982

[Night sleep studies: mobile recording in comparison to conventional laboratory recording].

Night sleep registrations were made in a group of 11 persons in a laboratory using both traditional polygraphic methods and a portable home recording system. A significantly higher value in the evaluation of the sleep efficiency index (quotient of total sleep time and total time in bed) was found with the mobile recording system. Apart from these findings the latency to the beginning of the particular sleep stages (classification of Dement and Kleitman) were diminished. Furthermore there was found a significant decrease of stage 1 in favour of the REM-sleep. Regarding the relation between the REM and the NREM-time, a distinct difference could also be shown. As to the subjective sensitivity, 10 of the 11 tested persons preferred the mobile recording system.

Adult↗
PubMed1997

Parallel recording of physical activity on commercial Holter recorders.

To accurately interpret heart rate variability (HRV) including circadian rhythm from Holter ECG, the simultaneous assessment of physical activity, which significantly affects HRV, is essential. In this study, to obtain this simultaneous assessment, the fundamental problems in implementing an accelerometer in a commercial Holter recorder were studied. In a treadmill exercise, three axial outputs of an accelerometer showed highly linear correlations with the running speed (correlation coefficient; vertical 0.94, forward-backward 0.97, sideways 0.97, three-dimensional amplitude 0.96, n = 8). The vertical acceleration showed a slightly sigmoidal increase with speed. Against a slope change, no significant increase in acceleration was observed except in the forward-backward direction. Individual calibration was found to be needed for the accurate estimation of physical load from body acceleration. A simplified calculation with the sum of the three axial absolute values correlated highly with the three-dimensional (3D) acceleration which shows the most reliable response to motions in any direction (r = 0.98, the slope of the regression line = 0.97) and, with this relation, the estimated 3D amplitude showed a sufficient degree of agreement. This substituted calculation was used in the Holter recordings. To know the posture of subjects, a piezoresistive accelerometer with the function of clinometer was used in another study. From played-back Holter recordings, the R-R interval and body acceleration were simultaneously sampled. The serial changes of both the power spectra of HRV and the body acceleration were observed over a 24 h period. Some cases with an abnormally reduced high-frequency component (HF) of HRV at night or an unusually high HF in the daytime were explained by physical conditions estimated with the accelerometer. The simultaneous assessment of patients' physical state by the present method provides the accurate interpretation of circadian rhythm in HRV.

Adult↗
PubMed1991

Completeness of the discharge diagnoses as a measure of birth defects recorded in the hospital birth record.

Licensed hospitals usually maintain a discharge diagnoses index, which provides an inexpensive tool for the surveillance of birth defects diagnosed shortly after birth. Government agencies in several states routinely use discharge diagnoses for this purpose. To evaluate the completeness of the discharge diagnoses, the authors compared birth defects noted in the discharge diagnoses with those noted anywhere in the hospital birth record in a cohort of 3,421 infants born to US Army veterans from 1966 to 1986. In this cohort, 237 birth defect cases were documented in hospital birth records, and 49% of those cases were missed in the discharge diagnoses (28% of major defect cases and 66% of minor defect cases). The extent of missed defects varied greatly by organ system and by specific defect. Significant predictors of a missed defect were the presence of multiple defects, female sex, and western region of birth. The underascertainment of defects in the discharge diagnoses should be considered in the development and operation of surveillance systems using this source of data.

Abnormalities, Multiple↗
PubMed1980

The federal confidentiality protections for alcohol and drug abuse patient records: a model for mental health and other medical records?

The federal regulations governing confidentiality of alcohol and drug abuse patient records are examined with respect to their applicability to mental health and other medical records. The analysis focuses on the purpose, scope, restrictions, and penalties of the federal statutes, and compares them to the pertinent legislative recommendations of the Privacy Protection Study Commission.

Alcoholism↗
PubMed2003

Electronic patient record and archive of records in Cardio.net system for telecardiology.

In modern medicine the well structured patient data set, fast access to it and reporting capability become an important question. With the dynamic development of information technology (IT) such question is solved via building electronic patient record (EPR) archives. We then obtain fast access to patient data, diagnostic and treatment protocols etc. It results in more efficient, better and cheaper treatment. The aim of the work was to design a uniform Electronic Patient Record, implemented in cardio.net system for telecardiology allowing the co-operation among regional hospitals and reference centers. It includes questionnaires for demographic data and questionnaires supporting doctor's work (initial diagnosis, final diagnosis, history and physical, ECG at the discharge, applied treatment, additional tests, drugs, daily and periodical reports). The browser is implemented in EPR archive to facilitate data retrieval. Several tools for creating EPR and EPR archive were used such as: XML, PHP, Java Script and MySQL. The separate question is the security of data on WWW server. The security is ensured via Security Socket Layer (SSL) protocols and other tools. EPR in Cardio.net system is a module enabling the co-work of many physicians and the communication among different medical centers.

Archives↗
PubMed2005

Standardized exchange of medical data between a research database, an electronic patient record and an electronic health record using CDA/SCIPHOX.

The exchange of medical data from research and clinical routine across institution borders in a structured way, based on national and international standards, is essential to build an integrated and connected health platform. In this project we developed a HL7 CDA/SCIPHOX based integration platform to exchange data between a research database, an electronic health record and an electronic patient record (Soarian).

Biomedical Research↗
PubMed1996

From medical record to patient record through electronic data interchange (EDI).

In this contribution the role of Electronic Data Interchange (EDI) for patient records is discussed. It is our opinion that unlimited access to patient records of different care provides is not a wise thing to do and may even not be acceptable legally. The exchange of EDI messages may be a solution in that the relevant information is exchanged on a need to know basis under the responsibility of the care provider that generated the information. The state of the art with respect to the availability of EDI messages in Europe is presented.

Communication↗
PubMed1985

A high capacity data recording device based on a digital audio processor and a video cassette recorder.

A modified digital audio processor, a video cassette recorder, and some simple added circuitry are assembled into a recording device of high capacity. The unit converts two analog channels into digital form at 44-kHz sampling rate and stores the information in digital form in a common video cassette. Bandwidth of each channel is from direct current to approximately 20 kHz and the dynamic range is close to 90 dB. The total storage capacity in a 3-h video cassette is 2 Gbytes. The information can be retrieved in analog or digital form.

Computers↗