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At least 19 recordsLinked to original sources
PubMed1999

A comparison of the interpretation of digitized and videotape recorded echocardiograms.

Conventional echocardiograms are typically recorded on videotape and later reviewed and interpreted by a physician. Although videotape recording is an excellent medium for this purpose, it does have several disadvantages, which may be overcome by digital storage. This study compared the diagnostic accuracy of digitized and videotape recorded echocardiograms. Echocardiographic examinations (n = 110) were recorded simulta-neously on videotape and were digitized with a commercially available frame grabber system. Images were transmitted by an Ethernet link to the network-based computer system and compressed with a nondestructive compression algorithm. Images were reviewed on a personal computer. Images were interpreted by 3 observers, and differences in interpretation were documented. There were 274 findings in 110 patients. Exact agreement in interpretation was found in 83%. A major discrepancy occurred in 2%, and a minor discrepancy occurred in 15%. Most discrepancies occurred in the setting of valvular heart disease. When compared with a consensus interpretation, no significant difference was seen in the number of errors between the digital and videotape interpretation. We conclude that the interpretation of a properly recorded digitized echocardiographic examination yields interpretations equivalent to those of videotape recordings.

Echocardiography↗
PubMed1978

Cassette videotape recording of computer images.

Direct videotape recording of images from computer display terminals is often not possible because of the nonstandard outputs of these systems. A video-sync mixer is described that permits black-and-white recording on standard 3/4-in. videotape cassettes.

Data Display↗
PubMed1997

High performance seizure-monitoring system using a vibration sensor and videotape recording: behavioral analysis of genetically epileptic rats.

A new seizure-monitoring apparatus containing a piezoceramic vibration sensor combined with videotape recording was developed. Behavioral analysis of Ihara's genetically epileptic rat (IGER), which is a recently developed novel mutant with spontaneously limbic-like seizures, was performed using this new device. Twenty 8-month-old male IGERs were monitored continuously for 72 h. Abnormal behaviors were detected by use of a vibration recorder, and epileptic seizures were confirmed by videotape recordings taken synchronously with vibration recording. Representative forms of seizures were generalized convulsions and circling seizures. Generalized convulsions were found in 13 rats, and circling seizures in 7 of 20 animals. Two rats had generalized and circling seizures, and two rats did not have seizures. Although there was no apparent circadian rhythm to the generalized seizures, circling seizures occurred mostly between 1800 and 0800 h. A correlation between the sleep-wake cycle and the occurrence of circling seizures seems likely. Without exception, all the seizure actions were recorded by the vibration recorder and the videotape recorder. To eliminate the risk of a false-negative result, investigators scrutinized the information obtained from the vibration sensor and the videotape recorder. The newly developed seizure-monitoring system was found to facilitate detailed analysis of epileptic seizures in rats.

Animals↗
PubMed1997

In vitro measurement of orthodontic tooth movement in rats given beta-aminopropionitrile or hydrocortisone using a time-lapse videotape recorder.

In vitro tooth movement of rat molars in response to an orthodontic force was recorded using a time-lapse videotape recorder and analysed by a computer system. Rats received daily s.c. injections of beta-aminopropionitrile (BAPN, 300 mg/kg/day) or hydrocortisone (10 mg/kg/day) for a period of 7 days. After drug administration, the animals were killed and the mandibles dissected. The jaw was then held under a stereomicroscope with a haemostatic clamp and an elastic band was inserted between the first and second molars. The movements of reference points on the occlusal surfaces of the first and second molars were recorded for 20 hours using a time-lapse videotape recorder. Mesiolingual movement of the first molar and distobuccal movement of the second molar were observed. During the experimental period, the greatest amount of total tooth movement in the first and second molars was seen in the group pretreated with BAPN, less movement was observed in the control group, and the group pretreated with hydrocortisone exhibited the least amount of movement. The highest rates of tooth movement were observed during the initial hour in each of the groups, and decreased thereafter. The initial rates of movement were also greatest in the BAPN group, less in the control group, and least in the hydrocortisone group. These results indicate that treatment with BAPN accelerated experimental tooth movements in vitro and hydrocortisone treatment inhibited the movements, suggesting that, although a part of the tooth movement measured in this experiment was due to deformation of the alveolar bone, the mechanical properties of the periodontal ligament play an important role in the regulation of orthodontic tooth movement.

Alveolar Process↗
PubMed2001

A semiautomatic method for adding behavioral data to videotape records in combination with the Noldus Observer system.

The Observer 3.0 (Noldus, 1991) was used as the base for a time-saving fine analysis of animal behavior. A PC controlled a shuttlebox and a shuttlebox control unit. Learning behavior was recorded on videotapes by an S-VHS camcorder with vertical interval time code (VITC), which was used to generate an observational data file (ODF). The observational system was enhanced by automatically recorded status signals from the PC as event markers on the soundtrack of the videotape. These signals were used to subdivide a training session into numbered trials during generation of the ODF. They were later used for a PC-aided fine analysis of behavioral events, such as attention responses (AR) and orienting responses (OR) during shuttlebox learning. In this way, a large number of both automatically inserted PC event markers and manually inserted, key-defined behavioral events were registered and analyzed effectively in a semiautomatic fashion. The system is illustrated with an analysis of shuttle-box avoidance data from gerbils (Meriones unguiculatus).

Acoustic Stimulation↗
PubMed2000

Videotaped recording as a method of participant observation in psychiatric nursing research.

This paper describes videotaped recording as a data collection method when conducting participant observation in a psychiatric nursing study. The videotaped episodes were part of the daily life of psychiatric nursing in a hospital environment. The advantages and limitations of using videotaped recording in nursing research will be discussed. This paper is based on two studies. The data consisted of 21 videotaped episodes of nursing report sessions or interdisciplinary team meetings in the psychiatric clinic of a university hospital. The participants consisted of patients, their significant others, nurses, doctors, social workers and physiotherapists. All videotaped material was transcribed verbatim. An essential advantage of videotaping is that most potentially useful interaction and behaviour can be captured. The advantage in terms of the credibility of videotaping was that the investigator was able to review the same videotaped situations again and again. Videotaped material is rich and provides several possibilities for analysing the data. In these studies data and source triangulation enabled the researchers to reduce personal influence on the results. The investigator must also be aware of the limitations concerning this method. The most essential limitations are mechanical problems and the influence of videotaping on behaviour. Careful ethical considerations are important concerning personal privacy, informed consent and respect for the self-determination of psychiatric patients.

Data Collection↗
PubMed1979

The application of prolonged EEG telemetry and videotape recording to the study of seizures and related disorders.

The clinical application of prolonged monitoring by the combined EEG and videotape recording of patients was evaluted. This test was found to be useful in diagnosing epileptic seizures in patients in whom both the history and diurnal EEG studies were unhelpful, and it assisted with the accurate classification of seizure types. It enabled seizure focus lateralisation in medically intractable epileptic who were being evaluated for surgery, and it also provided an objective estimate of minor seizure frequency. Prolonged EEG telemetry and videotape recording was especially useful in assessing additional seizures that develop in known epileptics. In some patients with syncope and drop attacks this technique helped to exclude atonic epileptic seizures and intermittent cardiac tachy-brady-arrhythmia as the underlying cause. As a method for identifying sleep disorders it has greater merits than conventional methods of polygraphic recordings.

Adolescent↗
PubMed1997

Peak systolic velocity, resistance index and pulsatility index. Variations in measuring a pre-recorded videotape.

PURPOSE: To study variation in the process of measuring Doppler ultrasound (US) wave forms. MATERIAL AND METHODS: Eleven radiologists measured peak systolic velocity (PSV), resistance index (RI), and pulsatility index (PI) from a pre-recorded videotape. The wave forms were taken from the carotid, brachial, celiac, and renal interlobar arteries in a healthy volunteer. Each radiologist obtained measurements 10 times from a freely chosen wave form of 10 wave forms (10-beat series) and then a further set of measurements also 10 times from a specific wave form (1-beat series). RESULTS: There was a significant variation in all the PSV, RI and PI values measured, both in the 1-beat series and in the 10-beat series. The greatest variation was seen in the PI values: up to 5.1-fold. Both intraobserver and interobserver reproducibilities were poor. CONCLUSION: The process of obtaining measurements from an identified wave form is a major source of error in Doppler US studies. Special attention should be paid to this final phase of an examination. We recommend that measurements be obtained from more than one heart beat.

Adult↗
PubMed1992

Postgraduate teaching audit by peer review of videotape recordings.

The effectiveness of peer review in postgraduate medical teaching by hospital consultants using videotape recordings of teaching sessions has been assessed. The technique is useful for routine, infrequent and for 'one off' self-tuition. Participants' assessment of the 'clarity of structure' of teaching sessions and 'abilities to self-analyse' did change but 'mannerisms' did not.

Education, Medical, Continuing↗
PubMed1978

Videotape recording in the assessment of the history-taking skills of medical students.

The potential of videotape recording in the assessment of student history-taking skills has been explored in a third year general practice undergraduate course. By concentrating on priority areas in history-taking it has been possible to develop a profile of the strengths and weaknesses of individual students and of the group as a whole which should be of value to course organizers.

Education, Medical, Undergraduate↗
PubMed1987

Videotape recording system for use with the slit lamp biomicroscope.

Previous attempts at capturing slit lamp biomicroscopy observations on videotape have had a limited success due to high expense, poor resolution, and/or insufficient light. A slit lamp biomicroscope-videotape recording system which incorporates current technology is described. Although the system is used primarily for contact lens research, other applications for the eye care practitioner are described.

Fundus Oculi↗
PubMed1977

Direct assessment of social behaviour from videotape recordings.

A number of frequency and duration measures, and also general ratings, were made to assess specified aspects of interpersonal behaviour. These were taken from videotape recordings of interviews, or informal conversations, involving psychiatric patients. The frequency and duration measures were found to have high inter-rater reliability. Pearsonian correlations were in the range of 0-88--0-99. The general ratings were less reliable (0-42--0-86). The patients were divided into two groups. The first were patients whose major difficulties were interpersonal problems. The second contained patients with other psychiatric problems. Comparisons between these groups revealed a number of significant differences in the behavioural frequency and duration measures. Significant differences were also found in the general ratings, but there were disagreements between the two raters which made the interpretation of these differences difficult. When, within the interpersonal problem group, informal conversations were compared with formal interviews, it was found that subjects spent longer looking at the other person during the conversation. No other differences were evident. The implications of the results for social skills research are discussed.

Adult↗
PubMed1975

[The use of videotape recordings in behavior therapy in children (author's transl)].

The vast majority of disturbances of child behavior are due to improper methods of upbringing. Alteration of the child's misbehavior is therefore best done by re-education of the parents. In this paper, a model for the modification of the behavior of mother and child by means of videotape recordings is described and illustrated by a report of treatment. Because of the high efficiency of video feedback for the conversion of parental educational style, its use in behavior therapy work is recommended unconditionally in spite of the very high costs and a considerable expenditure of time.

Behavior Therapy↗
PubMed1984

Hemispheric differences in split-brain monkeys viewing and responding to videotape recordings.

Eight split-brain monkeys were tested for hemispheric differences in their viewing of and responses to colored videotape recordings of monkeys, people, animals, and scenery. The number of facial expressions elicited from the right hemisphere was significantly greater than the number made when using the left hemisphere. Monkeys also tended to look longer when viewing with their right hemispheres than when viewing with the left.

Animals↗
PubMed1996

Can sleep and wakefulness be distinguished in children by cardiorespiratory and videotape recordings?

Polysomnography, including EEG recording, is the standard method to diagnose obstructive sleep apnea (OSA) in children and adults. Diagnosis of OSA would be considerably simplified if it was shown that sleep could be distinguished from wakefulness without EEG recordings. Therefore, we compared sleep/wakefulness classification using a simplified cardiorespiratory-video (CRV) method with standard polysomnography in 20 children undergoing in-hospital evaluation for OSA. The channels for the simplified montage were chosen because they (1) were suitable for unattended, home recordings, (2) allowed the diagnosis of apneas, hypopneas, desaturation, and movement/arousals, and (3) did not require attachment to the head or face that might disturb the childs sleep. Sleep staging by the two methods was blinded to results of the other method. We evaluated 21,832 30-s epochs--1,092+/-111 (SD) per child. Across 20 subjects, 79.7+/-7.1% of the epochs were sleep. The simplified montage agreed with polysomnographic classification of sleep/wakefulness for 93.8+/-2.5% of the epochs. Of all sleep epochs, 97.7 (96.4, 98.1%) median (interquartile range), were correctly classified; sleep predictive value of the CRV method was 95.2+/-2.8%. Of all epochs classified as wakefulness by polysomnography, 80.1+/-12.8% were correctly classified by the CRV method. The wakeful predictive value was 88.7+/-2.6%. Kappa values averaged 0.8+/-0.1, indicating that agreement between the CRV method and polysomnography did not occur by chance and that the level of agreement was excellent. Thus, sleep can be distinguished from wakefulness in children being evaluated for OSA using a combination of cardiorespiratory and videotape recordings. These results suggest that the CRV method would be useful in a pediatric laboratory setting where EEG recordings are not always possible. They also suggest that overnight, unattended CRV recordings in a childs own home could correctly distinguish sleep from wakefulness.

Child↗
PubMed1984

Partial complex seizures in children: an analysis of 69 seizures in 24 patients using EEG FM radiotelemetry and videotape recording.

The electroencephalographic and clinical manifestations of 69 partial complex seizures in 24 pediatric patients recorded during EEG-FM radiotelemetry and videotape monitoring were reviewed. The seizure could be divided into 3 electro-clinical types. Type I attacks were characterized by an initial motionless stare often followed by automatisms and associated with initial lateralized EEG changes. Type II attacks began with automatic behavior and had bilateral, diffuse changes on the EEG initially. Type II attacks began with a loss of body tone followed by automatisms and with bilateral EEG changes initially. This study demonstrates that both the clinical and electroencephalographic aspects of partial complex seizures in children are similar to those reported in adults. This similarity may be secondary to the early maturation of the limbic structures.

Adolescent↗
PubMed1988

Videotape recording of inpatient assaults: a pilot study.

Inpatient assaults were videotaped and then characterized by tape reviewers as showing high or low hostility. Over a 2-month period, the videotape reviewers documented more than twice as many high-hostility assaults as were documented by other methods of reporting.

Female↗