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At least 217 records · Page 12Linked to original sources
PubMed1993

Minor recorder imperfections can cause artifacts in the RR interval spectrum derived from Holter recordings.

Spectral analysis of the heartbeat (RR) interval is a powerful tool for noninvasively assessing the autonomic nervous system. In addition, it may prove to be valuable in stratifying patients at risk for cardiac death. The authors report on a case in which spectral analysis of the RR interval exhibited harmonically related peaks within the physiological range that defied physiological explanation. Analysis showed that these peaks resulted from a subtle abnormality of the Holter recorder that was not apparent in the observed electrocardiogram. Since this type of abnormality can be produced by either minor damage or a manufacturing error in any brand of Holter recorder, the RR interval spectrum derived form a Holter electrocardiogram should always be critically examined for this particular artifact.

Artifacts↗
PubMed1988

An IBM-PC based data collection system for recording rodent sexual behavior and for general event recording.

A microcomputer (IBM-PC) based data collection system for the acquisition and analysis of male rodent copulatory behavior and its reflexive components has been developed. This software features ease of data entry, flexibility across experimental protocols, and built-in tutorials. The program for the recording and analysis of sexual reflexes of the male is readily adapted for recording other behavior patterns.

Animals↗
PubMed1987

Recording electrophysiological signals from small moving animals: electrode fixation and low torque swivel for recording a weakly electric fish in a group.

A silicone rubber ring maintains an electrode on the electric organ of a mormyrid fish. The electrode is connected with a novel swivel, which allows free motion of the wire around its axis. The principle of the rotating contact is based on magnetic contact between a steel pin (moving) and a steel ball (fixed). Using this apparatus, a single fish within a group is recorded. The general electric activity of the group is recorded by means of two sets of fixed differential electrodes. These devices may be adapted for neuroethological studies of other small animals.

Animals↗
PubMed1999

Ambulatory blood pressure predicts end-organ damage only in subjects with reproducible recordings. HARVEST Study Investigators. Hypertension and Ambulatory Recording Venetia Study.

OBJECTIVE: To determine whether the prediction of target-organ damage varies according to the reproducibility of 24 h blood pressure. SETTING: Seventeen hypertension clinics in northeast Italy. MAIN OUTCOME MEASURES: Correlations of left ventricular mass index and albumin excretion rate with 24 h and office blood pressures in relation to tertiles of ambulatory blood pressure reproducibility. PATIENTS AND METHODS: In 716 consecutive, stage I, hypertensives enrolled in the Hypertension and Ambulatory Recording Venetia Study (HARVEST), ambulatory blood pressure monitoring was performed twice, 3 months apart In all subjects, the albumin excretion rate was measured by radioimmunoassay, and in 567, the left ventricular mass index was assessed by echocardiography. RESULTS: The subjects were divided into tertiles of ambulatory blood pressure consistency (between-monitoring differences, regardless of the sign). In the tertile of subjects with good reproducibility, correlation coefficients of systolic and diastolic ambulatory blood pressure with left ventricular mass and urinary albumin excretion were significant and higher than those of office blood pressure. In contrast, in the two tertiles with poorer reproducibility, the coefficients were barely or not significant for both pressures. The advantage of ambulatory blood pressure over office blood pressure in predicting target-organ damage was no longer present for systolic blood pressure differences greater than 3.8 mmHg and diastolic blood pressure differences greater than 3.1 mmHg. CONCLUSIONS: These data indicate that ambulatory blood pressure is a better predictor of left ventricular mass and urinary albumin excretion than office blood pressure, but only in subjects with good pressure reproducibility. Therefore, the assessment of hypertensive patients should be based on duplicate blood pressure monitorings. Recordings with 24 h systolic and diastolic blood pressure differences greater than 4 and 3 mmHg, respectively, should be considered with caution.

Adolescent↗
PubMed1979

Reproducibility of the normalized electromyographic recordings of the masseter muscle by using the EMG recording during maximal clenching as a standard.

A method of normalizing the integrated EMG recordings from the masseter muscles is introduced. For each subject investigated the maximal clenching force is remarkably constant and reproducible. This makes it possible to normalize the integrated EMG recordings to the EMG activity at the maximal clenching force without having to measure this force at the beginning of every experiment. These normalized integrated EMG activities give a good quantitative impression of the static force exerted by the masseter muscle, and therefore can be compared quantitatively over several experiments. The realtionship between the normalized integrated EMG activities and the clenching force is linear up to approximately 80% of the maximal clenching force.

Bruxism↗
PubMed2004

Directional frequency and recording (DIFAR) sensors in seafloor recorders to locate calling bowhead whales during their fall migration.

Bowhead whales, Balaena mysticetus, migrate west during fall approximately 10-75 km off the north coast of Alaska, passing the petroleum developments around Prudhoe Bay. Oil production operations on an artificial island 5 km offshore create sounds heard by some whales. As part of an effort to assess whether migrating whales deflect farther offshore at times with high industrial noise, an acoustical approach was selected for localizing calling whales. The technique incorporated DIFAR (directional frequency and recording) sonobuoy techniques. An array of 11 DASARs (directional autonomous seafloor acoustic recorders) was built and installed with unit-to-unit separation of 5 km. When two or more DASARs detected the same call, the whale location was determined from the bearing intersections. This article describes the acoustic methods used to determine the locations of the calling bowhead whales and shows the types and precision of the data acquired. Calibration transmissions at GPS-measured times and locations provided measures of the individual DASAR clock drift and directional orientation. The standard error of the bearing measurements at distances of 3-4 km was approximately 1.35 degrees after corrections for gain imbalance in the two directional sensors. During 23 days in 2002, 10,587 bowhead calls were detected and 8383 were localized.

Acoustics↗
PubMed1984

Physiological changes and sleep responses during and following a world record continuous walking record.

Physiological changes, and subsequent sleep responses, were recorded in a male subject during and following 338 miles of continuous walking and consequent sleep deprivation. One hundred and thirty hours of walking and a seventy-two hours post-walk recovery period were monitored. The subject walked at approximately 55% of maximum oxygen uptake (VO2 max), heart rate ranged between 102-106 b/min, and blood lactate (LA) remained below the 2 mmol/l level. No electrocardiograph abnormalities were observed either during the walk or pre- and post-functional diagnostic graded exercise test (FDGXT). Creatine kinase (CK) and creatine kinase isoenzyme (CK-MB) levels rose throughout the walk but exhibited differing depletion patterns. The ratio of CK-MB to CK (MB/CK%) did not exceed levels which are suggestive of myocardial ischaemia. Haematological variables demonstrated signs of anaemia towards the end of the walk. Catecholamine levels rose throughout the walk, with greater rises being observed in nor-adrenaline and dopamine. During the post-walk recovery phase, adrenaline concentration remained elevated. Following this extreme period of exertion, the subject demonstrated very short sleep latency and rapid entry into slow wave sleep (SWS). These sleep patterns were compared to sleep recordings made over a similar period (72 h) six months post-walk, when the subject was not exercising. Nocturnal growth hormone (GH) levels were significantly raised on the post-walk nights.

Anemia↗
PubMed1990

Multiple site optical recording of transmembrane voltage (MSORTV), single-unit recordings, and evoked field potentials from the olfactory bulb of skate (Raja erinacea).

1. Multiple site optical recording of transmembrane voltage (MSORTV), together with conventional extracellular electrophysiological techniques were utilized with in vivo and in vitro preparations of the olfactory bulb of the Atlantic skate Raja erinacea to analyze electrical activity simultaneously in layers deep to the glomerular layer. 2. In the living animals and the in vitro isolated olfactory bulb, orthodromic stimulation evoked a compound action potential in the olfactory nerve fibers, followed by a series of early field-potential waves (N1, P1, N2, P2, N3, and N4). During paired stimulation experiments, unusual patterns of facilitation and suppression were observed for the N2 wave. 3. After orthodromic stimulation, single units, presumably mitral/tufted cells, exhibited a period of early discharge, followed by a period of suppression of spontaneous activity and of their test response in a pair stimulation paradigm. Some neurons also exhibited a labile period of reexcitation that was accompanied by a late surface negative field potential; these responses were also present in olfactory bulb slices. 4. Extrinsic absorption changes obtained from 500-microns saggital slices of the olfactory bulb, stained with the pyrazooxonal dye RH-155, consisted mainly of two types of depolarizing responses, a fast and a slow component, followed under some conditions by a late hyperpolarization. All signals exhibited wavelength dependences typical of the action spectrum of RH-155 and were abolished in the presence of tetrodotoxin (TTX) or high K+ in the bath. 5. The fast component of the optical signal represents synchronous compound action potentials conducted by the olfactory nerve fibers or evoked in the mitral/tufted somata and axonal pathways. The slow depolarizing optical signal appeared, after orthodromic stimuli, mainly in the zone between the glomeruli and the mitral/tufted layer; barium (1-10 mM), which depolarizes glial cells, increased its size and duration, suggesting that this signal does not reflect a glial response to [K+]o. 6. Different condition/test (C/T) intervals produced partial or complete suppression of the test response, depending on the recording site and the stimulus intensity. Just threshold orthodromic stimuli evoked an intermediate period of facilitation of the slow signals. A similar period was also observed in the N2 wave of the field potential. 7. Calcium channel blockers such as cadmium ion, or a low Ca2+ medium, suppressed the slow optical component whether evoked by orthodromic, antidromic, or direct stimulation. gamma-Aminobutyric acid (GABA) and baclofen also reduced or blocked the slow component of the extrinsic absorption signal.(ABSTRACT TRUNCATED AT 400 WORDS)

Animals↗
PubMed1984

Privacy Act of 1974; system of records--PHS. Notification of a new system of records: 09-30-0046, "Survey of alcohol use among youth and young adults".

In accordance with the requirements of the Privacy Act, the Public Health Service (PHS) is publishing notice of a proposal to establish a new system of records entitled, "Survey of Alcohol Use Among Youth and Young Adults, HHS/ADAMHA/NIAAA," to create a single comprehensive research data base so that critical issues associated with alcohol use among 16- to 27-year-olds can be analyzed. PHS invites interested persons to submit comments on the proposed routine uses on or before March 19, 1984. DATES: PHS has sent a Report of a New System to the Congress and to the Office of Management and Budget (OMB) on Februrary 8, 1984 PHS has requested that OMB grant a waiver of the usual requirement that a system of records not be put into effect until 60 days after the report is sent to OMB and Congress (If this waver is granted, PHS will publish a notice to that effect in the Federal Register.)

Adolescent↗
PubMed1984

Privacy Act of 1974; notice of new system of records--HHS. Notice of new system of records.

In accordance with the Privacy Act of 1974 (Pub. L. 93-5790, as amended, the Office of Human Development Services is proposing to establish a new system of records, Records Maintained on Individuals for Program Evaluation Purposes Under Contracts, HHS, HDS No. 09-80-0100. We have provided background information about the proposed system in the "SUPPLEMENTARY INFORMATION" section below. HDS invites public comments by April 19, 1984 on the proposed routine uses of the system.

Civil Rights↗
PubMed1984

Privacy Act of 1974; system of records--PHS. Notification of a proposal to add a routine use and to add a special disclosure statement to the existing system of records 09-37-0015.

In accordance with the requirements of the Privacy Act and the Debt Collection Act of 1982 (Pub. L 97-365), the Public Health Service (PHS) is publishing notice of a proposal to add a new routine use and the (b)(12) special disclosure statement to consumer reporting agencies to system of records 09-37-0015, National Center for Health Services Research Grant Records System. The new routine use is for the purpose of determining credit worthiness of individual grant applicants of the National Center for Health Services Research (NCHSR).

Civil Rights↗
PubMed2000

Prescription Drug Marketing Act of 1987; Prescription Drug Amendments of 1992; policies, requirements, and administrative procedures; delay of effective date; reopening of administrative record. Food and Drug Administration, HHS. Final rule; delay of effective date; reopening of administrative record.

The Food and Drug Administration (FDA) is delaying until October 1, 2001, the effective date and reopening the administrative record to receive additional comments regarding certain requirements of a final rule published in the Federal Register of December 3, 1999 (64 FR 67720). The other provisions of the final rule become effective on December 4, 2000. The final rule implements the Prescription Drug Marketing Act of 1987 (PDMA), as modified by the Prescription Drug Amendments of 1992 (PDA) and the FDA Modernization Act of 1997 (the Modernization Act). FDA is delaying the effective date for certain requirements relating to wholesale distribution of prescription drugs by distributors that are not authorized distributors of record. FDA is also delaying the effective date of another requirement that would prohibit blood centers functioning as "health care entities" to act as wholesale distributors of blood derivatives. The agency is taking this action to address numerous concerns about the provisions raised by affected parties.

Drug Industry↗
PubMedDate not supplied

[A comparison of the spatial connections of superslow phasic electrical processes recorded from the surface of the head in healthy subjects to the spatial connections of a simultaneously recorded EEG].

The EEG and infraslow phasic electrical processes in the band of 0.05-0.5 Hz (ISPP) were simultaneously recorded in 16 derivations (10-20 System without Fz, Cz, and Pz) in 35 women volunteers in the state of quiet wakefulness with closed eyes. Artifacts and non-stationary segments with a sharp amplitude increase were eliminated from the records in preprocessing editing. Spatial correlations were evaluated using maxima of crosscorrelation functions and coherence functions averaged over the whole spectrum. Correlations for both kind of processes appeared to be rather similar, in particular, they were both characterized by the low values if interhemispheric covariations in the temporal areas. The ISSP correlations were significantly lower for the least distance between derivations and had lower spatial gradient than the EEG correlations. There were also some topical differences between the processes. The obtained evidence support the idea of the ISPP as direct manifestations of cortical electrical activity, however, rather specific in relation with the routine EEG correlations.

Adolescent↗
PubMed1988

[Scalp recorded P13 and spinal recorded N13 in short latency somatosensory evoked potentials].

Using non-cephalic reference and by median nerve stimulation, P 13 component and N 13 component are recorded on the scalp (scalp P 13) and the posterior neck (spinal N 13), respectively, in the short latency somatosensory evoked potentials (SSEP). The purpose of this study is to disclose the origin, characteristics and clinical significance of these two components. Ten healthy volunteers served for normal subjects. Ten patients with pontine lesion or brain death were studied. The effect of barbiturate was also studied in additional 5 patients during anesthesia for cranioplastic surgeries. Electrical stimuli of 0.2 msec square wave pulse were used in routine examination. To confirm the effects of stimulation frequency, 3, 6, 9, 12, 15, 18, 21, 24 and 27 Hz were also used in normal subjects. Recording electrodes were placed in the following sites. (1) Scalp electrode at the Shagass' point contralateral to the stimulated side (Par.). (2) Posterior neck electrode on the spinous process of the fifth cervical vertebrae (Cv5), (3) Anterior neck electrode on the thyroidal cartilage (Ant. C). (4) Erb's electrode just above the mid-clavicular point ipsilateral to the stimulation. Erb's electrode contra-lateral side of stimulation was used as a reference. Spinal N 13 on posterior neck reversed its polarity into P 13 (spinal P 13) on the anterior cervical electrode. A study with different stimulus rates revealed that the latency of scalp P 13 significantly prolonged at 24 Hz stimulation. On the other hand, the latency of spinal N 13-P 13 easily prolonged even at 18 Hz. This suggested that spinal N 13-P 13 were generated polysynaptically.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMedDate not supplied

Reading the medical record. II. Design of a human-computer interface for basic reading of computerized medical records.

A user interface for reading the medical record was designed and implemented on a workstation with a 19-inch colour screen. The text is presented on imitations of paper-pages. The pages are organized in bundles which are dynamically connected to scrollable index lists. The turning of pages on the screen is the fundamental concept of the interface. A page can be turned by a mouse-click or by a circular mouse-movement. Elaborated feedback is given to the user in order to provide effortless orientation and navigation. The interface supports the basic ways of use identified in our analyses of reading habits. It also enables human perceptual and cognitive skills to be used. It seems very easy to learn and efficient in use.

Cues↗
PubMed2000

The medical records professionals' view of the electronic medical record.

The migration of Kaiser-Permanente (KP), a large managed care organization, to the management of health care information in a paperless environment is presented from the viewpoint of Health Information Management (HIM) professionals. The author conducted an informal survey of these professionals and presents a synopsis of their recommendations in the context of KP's efforts to develop an enterprise Electronic Medical Record. Their consensus is that physicians are primarily information managers and that successful health care organizations will be those who most effectively manage their information.

Attitude of Health Personnel↗
PubMed1984

Antenatal records: do they help us? A new record for watching fetal growth.

An antenatal record is described which uses a questionnaire to detect mothers and babies at risk, and a graph for charting fetal growth indirectly, by maternal weight, height of fundus, and girth, to give a clear picture. By working out scores for fetal growth and cervical ripeness, guidance is given on when to take action to save babies likely to be born too soon or too late. Our slogan, "Be a Fetal Growth Watcher", serves as a mnemonic for: "Fundus, Girth, Weight".

Botswana↗