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At least 271 records · Page 15Linked to original sources

PubMed2002

Neural response telemetry in 12- to 24-month-old children.

The minimum age for cochlear implantation has been reduced to 12 months in an effort to provide auditory stimulation to children with hearing loss during early development. Because behavioral measures in such young children are limited, objective measures such as the electrically evoked compound action potential (EAP) from the auditory nerve are needed to facilitate measurement of stimulation level requirements. We assessed EAPs recorded by the Nucleus 24 neural response telemetry (NRT) system in children who underwent implantation between 12 and 24 months of age. We recorded EAPs in 37 such children (mean age at implantation, 18.1+/-3.6 months). The EAPs were of large amplitude, and thresholds fell between behavioral T and C levels. A correction factor applied to EAP thresholds provided useful predictions of T levels. The EAPs can be used to ensure that even very young children receive auditory stimulation with their cochlear implants upon device activation.

Action Potentials↗

PubMed1985

Monitoring heart and breath sounds by telemetry.

A system for FM radiotelemetry of heart and breath sounds is described. Patients' heart and breath sounds are detected by oesophageal or precordial stethoscopes. The anaesthetist, carrying a portable radio receiver, is then free to move around theatre while listening to these sounds through headphones or an ear-piece. The FM telemetry system has also been used to assist patient monitoring in noisy environments such as ambulances.

Anesthesiology↗

PubMedDate not supplied

Indirect assessment of cardiovascular "demands" using telemetry on professional football players.

Aerobic training is not a major component of th conditioning programs of professional football players. We used telemetric ECG monitoring to examine the cardiovascular "demands" of practice and game situations in six athletes who were selected to affect a variety of positions and aerobic capacities. Heart rates commonly considered high enough for an aerobic conditioning effect were rarely attained during a practice sessions. Maximum oxygen consumption testing confirmed that professional football players do not receive a sufficient amount of aerobic conditioning during practice. Telemetrically monitored heart rate response is much greater in a game situation than that experienced during practice. Telemetry results support injury statistics by indicating that aerobic conditioning should have a significant role in the training program of the professional football player.

Adult↗

PubMed1991

The clinical features and prognosis of pseudoseizures diagnosed using video-EEG telemetry.

A total of 110 patients underwent diagnostic evaluation for attacks of uncertain origin by means of video-EEG telemetry and had a diagnosis of pseudoseizures confirmed. Eighty-six patients (78%) were female, mean age of onset 25 years, and mean duration of attacks was 3 years. Many of the patients had erroneously been thought to be suffering from epilepsy. The attacks could be divided into two broad categories: attacks of collapse (one-third) and attacks with prominent motor activity (two-thirds). In some patients, the attacks were associated with incontinence and injury. The differential diagnosis and clinical features of the attacks are described. Additional psychiatric features were present in 52 (47%) patients. Follow-up (for a median 5 years; range, 1 to 14 years) showed that 40% of these patients stopped having pseudoseizures. This favorable outcome was associated with being female, leading an independent life, a formal psychological approach to therapy and counseling, and the absence of coexisting epilepsy, but not with the duration of pseudoepilepsy, prior episodes of pseudostatus, the coexistence of overt psychiatric disease, or the clinical features of the attacks.

Adult↗

PubMed1995

Measurement of blood pressure and heart rate by telemetry in conscious unrestrained marmosets.

A system is described for the continuous measurement of blood pressure, heart rate and motor activity by telemetry in conscious marmosets freely moving in their home cages. Consistent diurnal variations in these parameters were observed under standard conditions. However these parameters were sensitive to changes in the environment. Blood pressure values were similar to those measured by non-telemetric methods in conscious restrained marmosets while heart rate values were significantly lower.

Animals↗

PubMed2000

Preliminary neural response telemetry results.

This paper describes the neural response telemetry (NRT) results obtained from the first 30 patients tested at this centre. One hundred per cent of patients tested intra-operatively had NRT responses on at least one electrode; this compared to 82.4% of patients tested post-operatively. Reasonable correlations existed between post-operative NRT thresholds and psychophysical threshold and comfort levels, although there was too much variability for the data to be used to set these parameters directly. Post-operative NRT thresholds were always at levels audible to patients.

Acoustic Stimulation↗

PubMedDate not supplied

Telemetry system for heart-rate and blood temperature using a microcomputer.

A radio-telemetry system using a microcomputer has been constructed to measure both the heart-rate (HR) and right atrial blood-temperature in dogs. The telemeter incorporates a thermistor temperature probe, which allows blood-temperature measurements in the range of 35 degrees-42 degrees C with an available resolution of +/- 0.02 degree C. The output of the receiver is connected to active filters, a frequency counter and an HR meter, and finally to a microcomputer, through an appropriate interface circuit, for data linearization and storage.

Animals↗

PubMed1991

A new method for continuous chronic measurement and recording of blood pressure, heart rate and activity in the rat via radio-telemetry.

Accurate continuous chronic measurements of blood pressure from conscious laboratory rats are critical to many experimental protocols but have been difficult or impossible to acquire. A system consisting of an implantable radio-telemetry device, receiver, and computer-based data acquisition system that allows such measurements to be easily obtained has been developed. This system is capable of monitoring and recording arterial pressure (waveform, systolic, diastolic, and mean), heart rate, and activity from rats weighing greater than 175 gm for periods in excess of 6 months. Chronic patency has been achieved through a patented design which includes an antithrombogenic film and a gel membrane located at the catheter tip. Validation of telemetered measurements via carotid catheter has demonstrated the accuracy to be better than +/- 5 mmHg in 85% (N = 20) tested at 3 weeks post implantation, 86% (N = 15) tested at 8 weeks, and 78% (N = 9) at 12 weeks. Incidence of loss of patency was 2.3% (N = 44). This system has a demonstrated ability to obtain accurate continuous chronic measurements of arterial pressure free of the stressors associated with conventional systems.

Animals↗

PubMed1976

Electrocardiographic and respiratory responses to viscerotropic and neurotropic strains of Newcastle disease virus measured by radio telemetry.

Two groups each of White Rock chickens from 6 to 23 weeks old were monitored by radio telemetry to determine their electrocardiogram and respiration response after they were infected with either a velogenic viscerotropic isolate of Newcastle disease virus (VVND) or the neurotropic GB strain of Newcastle disease virus (NGB). Significant changes were found in the heart rate, R wave amplitude, ST segment elevation, T wave amplitude, RS complex interval, ST segment duration T wave interval, TP segment duration, PR segment duration and TP interval of the birds infected with VVND, but no significant ECG changes were found in the birds infected with NGB. There were no significant changes in respiration rate in any birds.

Animals↗

PubMed2005

Neural response telemetry and auditory/nonauditory sensations in 15 recipients of auditory brainstem implants.

Auditory brainstem implants (ABIs) provide a means of restoring some hearing sensations to individuals with neurofibromatosis type 2 (NF2) who are deaf after vestibular schwannoma removal. In this study, neural response telemetry (NRT) was used to record electrically evoked neuronal activity near the ABI electrode array in 15 such subjects. Our interest was to investigate whether NRT recordings from the brainstem might be useful in implanting or programming ABIs. We therefore sought relationships between postoperative NRT recordings and the sensations reported by the subjects in response to the test stimuli. However, no clear relationships among these variables were found, and it was not possible to differentiate recordings associated with auditory versus nonauditory sensations. The findings suggest that the categorization of NRT recordings used in this study is inappropriate for assisting with placement of an ABI electrode array intra-operatively or for programming the sound processor postoperatively.

Adolescent↗

PubMed2006

Use of neural response telemetry measures to objectively set the comfort levels in the Nucleus 24 cochlear implant.

Cochlear implant programming necessitates accurate setting of programming levels, including maximum stimulation levels, of all active electrodes. Frequently, clinical techniques are adequate for setting these levels; however, they are sometimes insufficient (e.g., very young children). In the Nucleus 24, several methods have been suggested for estimation of comfort levels (C levels) from neural response telemetry (NRT); however, many require co-application of clinical measurements. Data was obtained from 21 adult Nucleus 24 recipients to develop reliable predictions of C levels. Multiple regression analysis was performed on NRT threshold, slope of the NRT growth function, age, length of deafness, length of cochlear implant use and electrode impedance to examine predictive ability. Only the NRT threshold and slope of the growth function measures were significant predictors yielding R2 values from 0.391 to 0.769. Results demonstrated that these measures may provide an alternative means of estimating C levels when other clinical measures are unavailable.

Adult↗

PubMed1976

A 4-channel telemetry system for hospital patient monitoring.

A 4-channel radio telemetry system has been designed and implemented for use in the operating room on patients undergoing surgery. 30 such systems are in daily use throughout the Duke University Medical Cener. Relative simplicity, long battery life and a DC-response capability are the important features of these systems. The four physiological channels used are; electroencephalogram, electrocardiogram, peripheral pulse, and arterial blood pressure.

Blood Pressure Determination↗

PubMed1976

Clinical telemetry of EMG and temporal information during gait.

Multichannel telemetry has formed an integral part of the clinical assessment of children's walking problems. EMG signals and temporal information from foot switches are transmitted from a small belt-pack unit which provides almost complete freedom of movement for the child. Although patients with various crippling diseases have been studied, the investigation of problems resulting from cerebral palsy has been most valuable clinically. The effects of orthopaedic surgery to release or transfer muscles can be asssessed more positively and the causes of some unexplained gait patterns can be investigated more thoroughly.

Cerebral Palsy↗

PubMed1999

Telemetry monitoring in acute and critical care.

With the expansion of higher acuity patients in noncritical care areas, the perceived need for arrhythmia monitoring has also escalated. For institutions pursuing this expansion, many factors must be kept in mind, including patient criteria for telemetry initiation and discontinuation, staff competency of ECG interpretation, safety, technology required, usability, and cost effectiveness. All of these issues must be addressed according to the individual institution's needs and the needs of the patient populations they serve.

Acute Disease↗

PubMedDate not supplied

A preliminary report on continuous recording of salivary pH using telemetry in an edentulous patient.

PURPOSE: This study reports on the development and evaluation of a telemetry system for recording salivary pH. MATERIALS AND METHODS: The system used an iridium-oxide pH sensor (Metoxy sensor) and was housed inside a mandibular complete denture. It transmitted the data using the AM band (radio frequency of 12.3 MHz) and had a maximum power output of approximately 1 mW with a 3-V lithium battery (capacity 190 mAh). For the clinical evaluation, a 69-year-old woman who was edentulous and had no systemic disease was the subject. RESULTS: Under the conditions of the study, the system was able to operate for 19 hours. The maximum error of transmitted pH data values was pH 0.15 within the range from pH 5.0 to 9.0. The evaluation of the test subject showed that this system operated without problems, and that the pH levels responded appropriately. CONCLUSION: The developed system was shown to successfully record salivary pH, and it functioned as expected in a single test subject.

Aged↗

PubMed2000

Telemetry facilitates long-term recording of gastrointestinal myoelectrical activity in pigs.

A method of telemetric measurement of antroduodenal myoelectrical activity (EMG) in freely moving pigs has been developed. Silver bipolar electrodes were sutured on the antrum and duodenum and connected to a telemetry transmitter implanted extraperitoneally between the abdominal muscles. The EMG signals were collected by a receiver, filtered, amplified and archived by a computer. The telemetric EMG signal did not differ from that obtained with a conventional wire method. Substantial differences between day and night migrating myoelectric complex (MMC) patterns were found. The advantages of telemetric EMG recording make it a useful tool for long-term recording of antroduodenal EMG.

Action Potentials↗

PubMed1999

A microcontroller-based telemetry system for sympathetic nerve activity and ECG measurement.

A telemetry system employing a low power 8-bit microcontroller has been developed for chronic unanesthetized small animal studies. The two-channel system is designed for use with animals in shielded cages. Analog signals from implantable ECG and nerve electrodes are converted to an 8-bit serial digital format. This is accomplished by individual 8 bit A/D converters included in the microcontroller, which also has serial I/O port. The converted serial binary code is applied directly to an antenna wire. Therefore, the system does not need to employ a separate transmitter, such as in FM or infrared optical telemeters. The system is used in a shielded animal cage to reduce interference from external radio signals and 60 Hz power line fields. The code is received by a high input impedance amplifier in the cage and is then demodulated. The telemeter is powered by a small 3 V lithium battery, which provides 100 hours of continuous operation. The circuit is constructed on two 25 x 25 mm. printed circuit boards and encapsulated in epoxy, yielding a total volume of 6.25 cc. The weight is 15 g.

Animals↗

PubMed2001

Wireless vital sign telemetry to hand held computers.

Most physicians and other health care providers share/access patient information via hard copy chart records, telephone conversations, or through hospital computer networks. These modalities are cumbersome when physicians are away from the hospital and ground wiring infrastructure is not readily available. In a prior study, we used wireless in-flight telephony and the Internet to transmit vital signs from an airborne Boeing 757 to three remote locations on the ground. However, because all recipient stations relied on an institutional network to receive the information, it was not possible to transfer data to a given location beyond the hospital campus. We now propose an innovative system capable of transmitting telemetry information from any location in the globe to a single portable computer using Wireless Application Protocol (WAP) technology for the Internet. Medical data including blood pressure, pulse, respiratory rate, end tidal CO2, oxygen saturation and EKG tracings were transferred from a G2 (digital cellular) phone linked to a hand held computer to a remote hand held device and were viewed in real time using customized software. Cellular Digital Packet Protocols (CDPD) enabled data transfer speeds up to 19,200 bps. Advances including the Internet and wireless computer technology may revolutionize the way medical information is shared, making it possible for physicians and health allies to directly access patient data from anywhere at any time.

Humans↗