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At least 19 recordsLinked to original sources
PubMed2001

Polymyography combined with time-locked video recording (video EMG) for presurgical assessment of patients with cervical dystonia.

We assessed 26 patients with cervical dystonia, in whom botulinum toxin (BT) injections had failed, before selective peripheral denervation. We decided to base the decision which muscle should be denervated on both clinical information and EMG data and focussed on the following features: activity at onset or during 'dystonic spasms' (according to the concept of the 'leading' dystonic muscle), paradoxical activity during voluntary head movements causing restriction of head movements opposite the side of head turn or tilt and activity when symptoms deteriorated during walking. To identify these muscles we developed a new recording system that integrates simultaneous video-taping and polymyography (video EMG) by means of a digital counter, driven by the recording software (resolution 0.1 s), that was fixed in view of the video camera. This system time-locked clinical signs with relevant EMG activity thus allowing demonstration of the above features. These were found in 68% of dystonic muscles with each of them being present in approximately 40%. Video EMG allows an integrated approach to identify overactive neck muscles in patients with cervical dystonia taking into account both relevant clinical findings and EMG data.

Adult↗
PubMed2004

Digital video recording of cardiac surgical procedures.

PURPOSE: We attempted to find a method of reducing time and effort for recording videos of cardiac surgical procedures. DESCRIPTION: A camera mounting arm designed by us provided a properly fixed digital camera location for undisturbed recording. The camera and its remote control unit provided an opportunity for the surgeon to record only the steps of the operation without need for editing. EVALUATION: Digital videos produced by this method required no additional time from the surgeon except to record the commentary at leisure. The video recorded was of excellent quality and provided a well-focused recording of the steps of the operation. CONCLUSIONS: The technique described for video recording of cardiac surgical procedures provides a time-saving and easy method for good reproduction of surgical procedures.

Cardiac Surgical Procedures↗
PubMed1985

Video recording.

Two video techniques are commonly used for biomedical monitoring. The simplest technique uses 2 or 3 video cameras with a special-effects generator. The more advanced method uses one video camera with a reformatter, a special-effects generator and a time-code generator. The main components of a video recording system are the camera, tape recorder, monitor, special-effects generator, reformatter, audio system and time-code generator. Video recordings can be edited electronically, but the quality of the copies is dependent on the type of editing equipment and the technical expertise available. Video recording has helped to improve the diagnosis and treatment of seizures and has been widely used in clinical epilepsy research. Video monitoring is now generally available in large medical centers for the diagnosis of difficult patients.

Electroencephalography↗
PubMed2006

Clinical applications of commercially available video recording and monitoring systems: inexpensive, high-quality video recording and monitoring systems for endoscopy and microsurgery.

The exclusive charge-coupled device (CCD) camera system for the endoscope and electronic fiberscopes are in widespread use. However, both are usually stationary in an office or examination room, and a wheeled cart is needed for mobility. The total costs of the CCD camera system and electronic fiberscopy system are at least US Dollars 10,000 and US Dollars 30,000, respectively. Recently, the performance of audio and visual instruments has improved dramatically, with a concomitant reduction in their cost. Commercially available CCD video cameras with small monitors have become common. They provide excellent image quality and are much smaller and less expensive than previous models. The authors have developed adaptors for the popular mini-digital video (mini-DV) camera. The camera also provides video and acoustic output signals; therefore, the endoscopic images can be viewed on a large monitor simultaneously. The new system (a mini-DV video camera and an adaptor) costs only US Dollars 1,000. Therefore, the system is both cost-effective and useful for the outpatient clinic or casualty setting, or on house calls for the purpose of patient education. In the future, the authors plan to introduce the clinical application of a high-vision camera and an infrared camera as medical instruments for clinical and research situations.

Computer Systems↗
PubMed2001

A method for assessing the regional vibratory pattern of vocal folds by analysing the video recording of stroboscopy.

Stroboscopy and kymography have been used to examine the motional abnormality of vocal folds and to visualise their regional vibratory pattern. In a previous study (Laryngoscope, 1999), we introduced the conceptual idea of videostrobokymography, in which we applied the concept of kymography on the pre-recorded video images using stroboscopy, and showed its possible clinical application to various disorders in vocal folds. However, a more detailed description about the software and the mathematical formulation used in this system is needed for the reproduction of similar systems. The composition of hardwares, user-interface and detail procedures including mathematical equations in videostrobokymography software is presented in this study. As an initial clinical trial, videostrobokymography was applied to the preoperative and postoperative videostroboscopic images of 15 patients with Reinke's edema. On preoperative examination, videostrobokymograms showed irregular pattern of mucosal wave and, in some patients, a relatively constant glottic gap during phonation. After the operation, the voice quality of all patients was improved in acoustic and aerodynamic assessments, and videostrobokymography showed clearly improved mucosal waves (change in open quotient: mean +/- SD= 0.11 +/- 0.05).

Female↗
PubMed1994

Effective utilization of home-video recordings for the evaluation of paroxysmal events in pediatrics.

In young children, differentiating seizures from nonepileptic "spells" by history alone can be difficult, even for the specialist. Nonepileptic spells may be psychogenic (rare in the young child) or physiologic in origin. Physiologic spells misidentified as epileptic may be treated with antiepileptic medication where none is needed. Recording spells on video provides a potentially valuable supplement to the clinical history in arriving at a correct diagnosis. In practice, however, most home-video recordings prove difficult to interpret. Simple instructions to parents on the manner in which spells should be recorded will greatly increase the usefulness of home-video recordings. A systemic analysis of precipitating factors and the evolution and resolution of the spell will very often exclude seizures. The widespread availability of home-video recordings provides the pediatrician with an opportunity to visually examine a child's spells, often avoiding unnecessary investigations and referrals and allowing the physician to more confidently offer reassurance to the parents.

Anticonvulsants↗
PubMed2006

The use of digital video recorders (DVRs) for capturing digital video files for use in both The Observer and Ethovision.

Before switching a laboratory from analog to digital, for the recording of video files for use in Noldus software such as Ethovision and The Observer, researchers need to proceed with caution. There are obvious advantages in moving to digital recording for behavioral work, including increased storage capacity; no requirement to purchase video tapes; immediate search by date, time, or event; digital images are of higher quality; ability to view study sites remotely by Internet connection; and "smart" features, such as motion detection. But before you throw away your time-lapse video recorders, time code generators, and video multiplexors, there are some important cautions to take account of. Some research groups have bought digital surveillance systems on the assumption that they work with Ethovision and The Observer, only to be disappointed. The vast majority of systems depend on proprietary compression software that must then be converted to work properly in Ethovision or The Observer.

Animals↗
PubMed1998

Comparison of video-recorded consultations with those in which patients' consent is withheld.

BACKGROUND: Video-recorded consultations are widely used for research in general practice. Recently, video recordings have begun to be used for the purposes of general practitioner (GP) registrar assessment. It is unknown, however, whether consultations in which patients withhold consent for recording differ from those that are recorded. AIM: To compare clinical problems and demographic characteristics of adult patients who consent to the video recording of consultations with those who withhold consent. METHOD: This was prospective study of 538 adult patients consulting 42 GPs, based in practices throughout Leicestershire. Each patient attended a surgery session with one of the 42 GPs between April 1995 and March 1996. Clinical presentations and demographic characteristics of patients consenting and withholding consent to the video recording of their consultations were compared. GPs' perceptions of whether patients in these two groups were distressed/upset or embarrassed were also compared. RESULTS: A total of 85.9% (462/538) of adults consented to video recording, and 14.1% (76/538) withheld consent. Multiple logistic regression revealed that patients who presented with a mental health problem were more likely to withhold consent to recording (odds ratio 2.5, 95% confidence interval 1.4-4.6). Younger patients were also more likely to withhold consent to video recording. Additionally, where patients' consent was withheld, GPs perceived patients to be more distressed or embarrassed. CONCLUSION: Younger patients and those suffering from mental health problems are more likely than others to withhold consent to being video recorded for research purposes in general practice. The implications of this study for the assessment of registrar GPs using video-recorded consultations are discussed.

Adolescent↗
PubMed2006

Using video recording to identify management errors in pediatric trauma resuscitation.

OBJECTIVE: To determine the ability of video recording to identify management errors in trauma resuscitation and to compare this method with medical record review. METHOD: The resuscitation of children who presented to the emergency department of the Royal Children's Hospital between February 19, 2001, and August 18, 2002, for whom the trauma team was activated was video recorded. The tapes were analyzed, and management was compared with Advanced Trauma Life Support guidelines. Deviations from these guidelines were recorded as errors. Fifty video recordings were analyzed independently by 2 reviewers. Medical record review was undertaken for a cohort of the most seriously injured patients, and errors were identified. The errors detected with the 2 methods were compared. RESULTS: Ninety resuscitations were video recorded and analyzed. An average of 5.9 errors per resuscitation was identified with this method (range: 1-12 errors). Twenty-five children (28%) had an injury severity score of >11; there was an average of 2.16 errors per patient in this group. Only 10 (20%) of these errors were detected in the medical record review. Medical record review detected an additional 8 errors that were not evident on the video recordings. Concordance between independent reviewers was high, with 93% agreement. CONCLUSIONS: Video recording is more effective than medical record review in detecting management errors in pediatric trauma resuscitation. Management errors in pediatric trauma resuscitation are common and often involve basic resuscitation principles. Resuscitation of the most seriously injured children was associated with fewer errors. Video recording is a useful adjunct to trauma resuscitation auditing.

Adolescent↗
PubMedDate not supplied

Interobserver variations in assessment of antral disease from direct sinoscopic observations compared to video recordings.

We tested the reliability of visual clinical sinoscopic observations by using video recordings. An edited video tape was made from the video-recorded bilateral antral sinoscopies of nine patients included in a prospective case series of inflammatory maxillary sinus disease in critically ill patients. An expert panel of four consultant ENT surgeons made individual appraisals of the video using a structured form. They had only been informed in general about the study, but had no further case knowledge in order to avoid all biases. Concordance and interobserver variabilities in the expert panel were compared in pairs. The assessments of the expert panel were compared with the observations of the performer, who was biased through individual case knowledge. Nine patients, either nasotracheally intubated or tracheotomized, had ventilator treatment for more than 7 days. One ENT surgeon performed all sinoscopies and made the direct observations. Satisfactory agreement was found on mucosal alterations. The concordance of recognizing bacterial infection was almost perfect. However, the assessment of redness from a video recording displayed only chance agreement. The differences between kappa statistic values within the expert panel group compared to the comparisons of performer versus expert panel were not significant. The case knowledge of the sinoscopist did not alter the assessments markedly and thus seemed only to have minor influence. Video recording as a method for second opinion was shown to be a useful technique, but will have to be further developed.

Adult↗
PubMed2000

Using video-recorded consultations for research in primary care: advantages and limitations.

BACKGROUND: Video-recording primary care consultations is an established technique for primary care research. Despite the widespread use of video-recording to help answer a variety of research questions, little is known about how this recording technique influences the findings of studies in which it is employed. OBJECTIVE: This article investigates how video-recorded consultations have been used in research and discusses how this technique may influence both the internal and external validity of studies. CONCLUSION: Using video-recorded consultations for research purposes may cause bias in the characteristics of doctors and patients who agree to participate in research. There is little evidence, however, that video-recording influences the behaviour of either GPs or patients. Recommendations are made for researchers who are considering using video-recorded consultations in their research.

Bias↗
PubMed1992

The measurement of blood flow waveforms from X-ray angiography. Part 2: Application to video recordings of digital subtraction angiography.

A method of measuring blood flow from X-ray angiograms recorded on cine film, by obtaining contrast mass values at numerous positions along individual vessels and at multiple instants of time, has been previously reported. In the present work it was hypothesized that the signal-to-noise limitations of recordings on video tape could be overcome by recording already-subtracted angiograms from a digital subtraction angiographic (DSA) system and that the spatial resolution of video was adequate to use a similar measurement method. Validation experiments were recorded, in which flows measured using a calibrated electromagnetic flowmeter passed through tubes of 4-7 mm diameter, during injections of 2-5 ml contrast medium. The video sequences were computer analysed and produced angiographic flow measurements agreeing with the electromagnetic flows to within 5 per cent. A case study of a clinical carotid artery DSA in a patient with secondary carcinoma metastases in the brain is described. It is concluded that accurate flow measurements can be made from DSA video recordings.

Algorithms↗
PubMed1986

Microscopic observation and video recording of cellular response to sudden changes in environment.

A method to record responses of single cells to rapid changes in their environment is described. A rectangular glass microcapillary is filled with the cell suspension under investigation and placed under a light microscope. With the aid of a micromanipulator a smaller microcapillary with a narrowed tip, which was still over 10 times wider than the cell diameter, is driven into the larger, cell containing, microcapillary. The environment of the cells is changed by injecting a new medium via the smaller capillary and the cell responses are recorded using a video recording system. The usefulness of the system has been examined by studying the time course of the osmotic swelling of erythrocytes after water injection and the shape transformations caused by lysophosphatidylcholine.

Erythrocytes↗
PubMed1990

Does awareness of being video recorded affect doctors' consultation behaviour?

Four general practitioners, two of whom had no previous experience of video recording in the consultation, took part in a study to assess the effect of awareness of video recording on their consultation behaviour. A video camera was sited unobtrusively in each consulting room for a month during which five randomly selected surgeries were recorded with the doctors being informed at the time, and five without their being informed. The video recorded consultations were analysed using TIMER, a tool designed to measure objectively behaviour in terms of physical, verbal and secondary activities in consultations. The proportions of time spent on the 27 consultation parameters were compared when doctors were aware and unaware of the recording, using analysis of variance. This demonstrated only one significant difference, in the low frequency parameter of the doctor's exploration of the patients' concepts (P less than 0.05). In a secondary analysis of the first four consultations in each surgery, where any effect of the presence of the video camera would be expected to be most marked, there was again only one significant difference in the 27 parameters (in patient preparation; P = 0.01). No significant difference owing to awareness of video recording was found in consultation length, the number of problems dealt with, or previous inexperience of video recording. When surgeries at the start of the month were compared with those at the end, four significant differences (P less than 0.05) out of 108 areas were demonstrated both when the doctor was aware and unaware of video recording, and there was no consistency in the direction of the differences.(ABSTRACT TRUNCATED AT 250 WORDS)

Awareness↗
PubMed2005

Adding video recording increases the diagnostic yield of routine electroencephalograms in children with frequent paroxysmal events.

PURPOSE: To report on the usefulness of adding video recording to routine EEG studies of infants and children with frequent paroxysmal events. METHODS: We analyzed the efficacy of this diagnostic means during a 4-year period. The decision whether to add video recording was made by the pediatric EEG interpreter at the time of the study. Studies were planned to last between 20 and 30 min, and, if needed, were extended by the EEG interpreter. For most studies, video recording was added from the beginning of EEG recording. In a minority of cases, the addition of video was implemented during the first part of the EEG test, as clinical events became obvious. In these cases, a new study (file) was begun. The success rate was analyzed according to the indications for the EEG study: paroxysmal eye movements, tremor, suspected seizures, myoclonus, staring episodes, suspected stereotypias and tics, absence epilepsy follow-up, cyanotic episodes, and suspected psychogenic nonepileptic events. RESULTS: Video recording was added to 137 of 666 routine studies. Mean patient age was 4.8 years. The nature of the event was determined in 61 (45%) of the EEG studies. Twenty-eight percent were hospitalized patients. The average study duration was 26 min. This diagnostic means was particularly useful for paroxysmal eye movements, staring spells, myoclonic jerks, stereotypias, and psychogenic nonepileptic events. About 46% of 116 patients for whom cognitive data were available were mentally retarded. EEG with added video recording was successfully performed in all 116 cases and provided useful information in 29 (55%) of these 53 patients. CONCLUSIONS: Adding video recording to routine EEG was helpful in 45% of cases referred for frequent paroxysmal events. This technique proved useful for hospitalized children as well as for outpatients. Moreover, it was successfully applied in cognitively impaired patients. Infants and children with paroxysmal eye movements, staring spells, myoclonic jerks, stereotypias, and pseudoseizures especially benefited from this diagnostic means. Because of its low cost and the little discomfort imposed on the patient and his or her family, this technique should be considered as a first diagnostic step in children with frequent paroxysmal events.

Age Factors↗
PubMed2006

Digital video recording and archiving in ophthalmic surgery.

Currently most ophthalmic operating rooms are equipped with an analog video recording system [analog Charge Couple Device camera for video grabbing and a Video Cassette Recorder for recording)]. We discuss the various advantages of a digital video capture device, its archiving capabilities and our experience during the transition from analog to digital video recording and archiving. The basic terminology and concepts related to analog and digital video, along with the choice of hardware, software and formats for archiving are discussed.

Computer Storage Devices↗
PubMed1999

Combining qualitative interviews with video-recorded consultations: gaining insight into GPs' decision-making.

BACKGROUND: Studies of GPs' decision-making are important for facilitating our understanding of GPs' consulting behaviours. We have used a novel combination of semi-structured interviews and video-recorded consultations to research the influences on decisions made by GPs during their consultations. OBJECTIVE: We describe the use of GPs' video-recorded consultations as a stimulus for focused, semi-structured interviews and to discuss how this research method compares with other approaches for studying GPs' decision-making during consultations. METHODS: GPs' surgery sessions were video-recorded and later they were shown video recordings of themselves consulting with smokers before participating in semi-structured interviews about these consultations. Interviews aimed to describe the factors which GPs perceived to influence their decisions to discuss or not discuss smoking with patients. DISCUSSION: This technique can be used to research decisions, which are made frequently by GPs. It is probably most appropriate for gaining insight into decision-making during mundane consultations, to which GPs would otherwise give little thought.

Decision Making↗