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Telemedicine in pediatric transport: a feasibility study.

OBJECTIVE: Investigate the hypothesis that telemedicine, in the form of real-time audiovisual transmission, would permit accurate assessment of illness severity and allow improved triage for transport. METHODS: A prospective study comparing assessments of patients examined conventionally (in person) and remotely by a telemedicine link. Fifteen patients (3 months to 14 years of age) admitted to our emergency department were evaluated as if for transport. Patients were evaluated simultaneously by a physically present pediatric emergency room physician and by a pediatric critical care physician linked to the examining room by a broadband audiovisual link. Each physician completed a patient assessment questionnaire independently. The sensitivity and specificity of the patient assessment by the audiovisually linked physician were calculated. RESULTS: Sensitivity, ie, the ability of the remote, audiovisually connected telemedicine physician to detect abnormal findings, is 87.5%. Specificity, the ability of the remote physician to detect normal findings, is 93%. It is likely that sensitivity would be markedly improved with addition of an electronic stethoscope. CONCLUSION: This study demonstrates that pediatric patients may be assessed accurately with a broadcast-quality real-time audiovisual system. Such a system may have dramatic implications for providing pediatric specialty and subspecialty care in underserved areas.

Adolescent↗

Effectiveness of school-based telehealth care in urban and rural elementary schools.

OBJECTIVE: This study evaluated the quality and cost effectiveness of health care provided in urban and rural elementary school-based telehealth centers, using plain old telephone system (POTS) technology. METHODS: A telehealth school-based model was developed that used a full-time school nurse, half-time mental-health consultant, linked pediatric practice, and linked child psychiatrist via POTS with an electronic stethoscope; ears, nose, and throat endoscope; and otoscope. One rural and 1 urban center were evaluated. Providers, nurses, children, and parents completed satisfaction questionnaires. Providers and nurses also evaluated how well telemedicine supported their clinical decision making. Parents were asked how use of the center affected them financially and at work. RESULTS: Of the combined 3461 visits to school nurses at both centers, 4.3% resulted in 150 telehealth consultations referrals; 142 (95%) were completed during the 2-year project. The most common teleconsult diagnoses were otitis media, pharyngitis, dermatitis, and upper respiratory infections. Provider, nurse, child, and parent satisfaction all were high. Providers' and nurses' decision confidence scores ranged from a low of 4 to a high of 4.8 on a 5-point scale. Average family savings per encounter were 3.4 hours of work time (43 dollars) and 177 dollars in emergency department or 54 dollars in physician costs. Including travel, savings for families ranged from 101 dollars to 224 dollars per encounter. Thirteen children received telepsychiatric evaluations resulting in diagnoses of depression and attention-deficit/hyperactivity, anxiety, and conduct disorders. CONCLUSIONS: Telehealth technology was effective in delivering pediatric acute care to children in these schools. Pediatric providers, nurses, parents, and children reported primary care school-based telehealth as an acceptable alternative to traditional health care delivery systems. The POTS-based technology helps to make this telehealth service a cost-effective alternative for improving access to primary and psychiatric health care for underserved children.

Adult↗

Telemedicine reduces absence resulting from illness in urban child care: evaluation of an innovation.

BACKGROUND: Common acute illness challenges everyone involved in child care. Impoverished inner-city families, whose children are most burdened by morbidity and whose reliance on child care is most important, are those least equipped to deal with this challenge. OBJECTIVE: To assess the impact of telemedicine on absence from child care due to illness (ADI). DESIGN/METHODS: A before-and-after design with historical and concurrent controls was used to study ADI in 5 inner-city child care centers in Rochester, New York, between January 1, 2001, and June 30, 2003. Enrollment averaged 138 children per center, of whom Medicaid covered 66%. Center 5 provided only concurrent controls. Telemedicine service began in the first 4 centers in a staggered fashion starting in May 2001. Baseline data on ADI before availability of telemedicine were collected in each center for a minimum of 18 weeks. The telemedicine model for diagnosis and treatment of common acute problems involved both real-time and store-and-forward information exchange between a child and telemedicine assistant in child care and an office-based telemedicine clinician. Devices used were an all-purpose digital camera (with attachments designed to facilitate capture of ear, nose, throat, skin, and eye images) and an electronic stethoscope. ADI indexed illness that had interrupted care and education for children and burdened both parents and the community with work loss and health care-related costs. Detailed attendance records and staff and parent interviews provided data. The total number of days of attendance expected from all registered children over the course of a week (total child-days) served as the denominator in calculating rates for ADI. The center-week served as the primary unit of analysis. This study is descriptive in character; statistics are not inferential but instead serve to summarize observations. RESULTS: For the 400 weeks of valid observations contributed by the 5 centers, the mean ADI was 6.41 absences per 100 child-days per week. In bivariate analysis, predictors of ADI were children's mean age, child care center, proportion of children covered by Medicaid, season of the year, and availability of telemedicine. ADI during weeks with telemedicine (4.07 absences per 100 child-days) was less than half that during weeks without telemedicine (8.78 absences per 100 child-days). After adjusting for potentially confounding variables using the generalized estimating equations method, telemedicine remained the strongest predictor of ADI. A 63% reduction in ADI was attributable to telemedicine, an effect similar to the 59% variation in ADI with season of the year. During the 201 total weeks that telemedicine services were available, 940 telemedicine encounters occurred. Telemedicine clinicians for these 940 encounters recommended exclusion from child care for 7.0% and in-person visits for 2.8% of the children. In surveys, parents indicated that 91.2% of telemedicine contacts allowed them to stay at work and that 93.8% of problems managed by telemedicine would otherwise have led to an office or emergency department visit. CONCLUSIONS: Telemedicine holds substantial potential to reduce the impact of illness on health and education of children, on time lost from work in parents, and on absenteeism in the economy.

Absenteeism↗

A new method for evaluating small intestinal motility using duplex Doppler sonography.

OBJECTIVE: Many techniques currently used to study motility of the small intestine are too complex for large-scale use; other techniques provide information that is nonspecific and nonquantitative. The aim of the present study was to verify whether intestinal peristalsis can be seen and quantitatively assessed by means of duplex Doppler sonography. SUBJECTS AND METHODS: We prospectively studied 152 normal fasting subjects using sonography, duplex Doppler sonography, and stethoscopic auscultation or phonocardiographic registration of bowel sounds in three abdominal sites. In each subject, we positioned the sample volume near the intestinal wall and then recorded Doppler signals of different amplitude and duration that related to bowel motility. Studies were repeated after ingestion of water (n = 55) and after a standard test meal (n = 73). The number of peristaltic waves and the number of bowel sounds revealed by the different imaging techniques were compared and statistically evaluated by Student's t test. RESULTS: Intestinal movements were classified as peristaltic or nonperistaltic (mixing movements) based on amplitude and duration of Doppler signals. The mean number of peristaltic waves revealed by Doppler sonography was three per minute in fasting subjects, with no significant increase after ingestion of water (3.78 per min) or the test meal (3.92 per min). The mean number of bowel sounds obtained with auscultation and phonocardiographic recordings was significantly higher in fasting subjects (8.7 per min) and after ingestion of water (9.55 per min) or the test meal (12 per min). CONCLUSION: Intestinal contractions produce Doppler signals of different amplitudes and duration, thus potentially allowing differentiation between peristaltic and nonperistaltic movements. This differentiation is not possible with auscultation or phonocardiographic registration because similar bowel sounds are produced by nonprogressive, mixing movements as well as by true peristaltic movements. Duplex Doppler sonography allows graphic visualization of intestinal movements that can be subjected to qualitative and quantitative analysis and may be suitable for the noninvasive study of small-bowel motility.

Auscultation↗

Porifera a reference phylum for evolution and bioprospecting: the power of marine genomics.

The term Urmetazoa, as the hypothetical metazoan ancestor, was introduced to highlight the finding that all metazoan phyla including the Porifera [sponges] derived from one common ancestor. Analyses of sponge genomes, from Demospongiae, Calcarea and Hexactinellida have permitted the reconstruction of the evolutionary trail from Fungi to Metazoa. This has provided evidence that the characteristic evolutionary novelties of Metazoa existing in Porifera share high sequence similarities and in some aspects also functional similarities to related polypeptides found in other metazoan phyla. It is surprising that the genome of Porifera is large and comprises substantially more genes than Protostomia and Deuterostomia. On the basis of solid taxonomy and ecological data, the high value of this phylum for human application becomes obvious especially with regard to the field of chemical ecology and the hope to find novel potential drugs for clinical use. In addition, the benefit of efforts in understanding molecular biodiversity with focus on sponges can be seen in the fact that these animals as "living fossils" allow to stethoscope into the past of our globe especially with respect to the evolution of Metazoa.

Animals↗

Wavelet processing of systolic murmurs to assist with clinical diagnosis of heart disease.

Despite advances in imaging technologies for the heart, screening of patients for cardiac pathology continues to include the use of traditional stethoscope auscultation. Detection of heart murmurs by the primary care physician often results in the ordering of additional expensive testing or referral to cardiology subspecialists, although many of the patients are eventually found to have no pathologic condition. In contrast, auscultation by an experienced cardiologist is highly sensitive and specific for detecting heart disease. Although attempts have been made to automate screening by auscultation, no device is currently available to fulfill this function. Multiple indicators of pathology are nonetheless available from heart sounds and can be elicited using certain signal processing techniques such as wavelet analysis. Results presented here show that a signal of pathology, the systolic murmur, can reliably be detected and classified as pathologic using a portable electrocardiogram and heart sound measurement unit combined with a wavelet-based algorithm. Wavelet decomposition holds promise for extending these results to detection and evaluation of other audible pathologic indicators.

Algorithms↗

Clinical evaluation of the Takeda Medical (A & D) TM 2420 ambulatory blood pressure monitor. Practical experience and comparison with direct and indirect measurements.

Takeda Medical (A & D) TM 2420 is an automatic ambulatory blood pressure monitoring system employing the auscultatory technique. The device was used under stable conditions and compared to readings from the Hawksley random-zero sphygmomanometer using a double headset stethoscope and a Y-connection. We tested 85 subjects (aged 13-89 years, systolic blood pressure 85-212 mmHg, diastolic blood pressure 40-116 mmHg) and found a difference amounting to 1.6 +/- 6.7 mmHg (mean +/- SD) for systolic and 2.1 +/- 4.5 mmHg for diastolic readings (Hawksley-TM 2420). In 62 subjects a comparison with simultaneous measurement on the opposite arm with the Hawksley manometer showed similar results. When comparing intra-arterial readings from 10 subjects, a difference (intra-arterial-TM 2420) of -1.9 +/- 12.1 mmHg was found for systolic pressures, while the diastolic difference was -10.7 +/- 8.7 mmHg. Twenty-four hour monitoring was performed on 80 subjects; 70 of these yielded usable tracings. The proportion of successful recordings was acceptable, but the device was not suitable for bicycle stress testing. The quality of the accessories provided with the equipment could be improved, but in spite of this the monitoring system was found to be recommendable for clinical use.

Adolescent↗

The efficacy of Doppler monitoring for the detection of venous air embolism.

Venous air embolism can usually be detected by the use of a precordial Doppler ultrasound monitor at an air infusion rate as low as 0.015 ml/kg/min, and consistently at a rate of 0.021 ml/kg/min. This is in contrast to previously reported thresholds wherein the first physiological change, a gasp, occurs at 0.36 ml/kg/min, electrocardiographic changes first take place at 0.60 ml/kg/min, drop in blood pressure at 0.69 ml/kg/min, increased central venous pressure at 0.40 ml/kg/min, and end-tidal CO2 decreases at 0.42 ml/kg/min. The first change in heart sounds monitored through an esophageal stethoscope is not detectable until an air infusion rate of 1.70 ml/kg/min, and the classical mill-wheel murmur does not occur until 1.96 ml/kg/min. This demonstrates that Doppler ultrasound can detect venous air embolism before the earliest physiological changes, in contrast to most other methods which do not detect venous air embolism until after cardiopulmonary changes have become well established.

Animals↗

A nursing home telehealth system: keeping residents connected.

Live video and detailed images of nursing home residents can be transmitted in real time via the Internet. This telehealth system allows residents and long-term care health professionals to connect with experts not available on-site. Electronic stethoscope, otoscope, dermascope, dentalscope, and electrocardiogram are available for use via the Internet. Impediments to implementing telehealth systems in long-term care include costs and the lack of reimbursement for telehealth services. Reimbursement for telemedicine in nursing homes is limited by originating site, current procedural terminology codes, and facility location.

Aged↗

Survey of Staphylococcus isolates among hospital personnel, environment and their antibiogram with special emphasis on methicillin resistance.

The objective of this study was to find the prevalence of Staphylococcus spp. carriage among hospital personnel and hospital environment and their antibiogram with special emphasis on methicillin resistance. A total of 205 samples from hospital personnel and environment were collected from casualty, oncology and multidisciplinary cardiac unit ward of Kasturba Medical College Hospital, Manipal. Samples were collected using sterile cotton wool swabs and inoculated into brain heart infusion broth. Subcultures were done onto blood agar and MacConkey's agar. Isolates were identified by standard methods up to species level. Antimicrobial susceptibility test was performed according to standardized disc diffusion Kirby-Bauer method. Each of the isolates was screened for methicillin resistance using oxacillin disc on Mueller Hinton agar plate followed by MIC for methicillin and cefoxitin susceptibility test by disc diffusion method. Sixty five out of 205 strains (31.7%) were Staphylococcus spp. and all of them were coagulase negative. Most of the strains belonged to S.epidermidis 49.23% (32/65) followed by S. saprophyticus 26.15% (17/65). Maximum isolates of S.epidermidis were from anterior nares 28.12% (9/32 strains of S.epidermidis). Highest number of methicillin resistant coagulase negative strains (3/9, 33.33%) were isolated from stethoscope of multidisciplinary cardiac unit ward followed by carriers in the anterior nares (2/9, 22.22%). Methicillin resistant coagulase negative staphylococci are prevalent in anterior nares of hospital personnel and in the hospital environment thereby providing a definite source for hospital acquired infection. All isolates were sensitive to vancomycin, ciprofloxacin and amikacin.

Anti-Bacterial Agents↗

[A new medical education using a lung sound auscultation simulator called "Mr. Lung"].

We developed a lung sound auscultation simulator "Mr. Lung" in 2001. To improve the auscultation skills of lung sounds, we utilized this new device in our educational training facility. From June 2001 to March 2002, we used "Mr. Lung" for our small group training in which one hundred of the fifth year medical students were divided into small groups from which one group was taught every other week. The class consisted of ninety-minute training periods for auscultation of lung sounds. At first, we explained the classification of lung sounds, and then auscultation tests were performed. Namely, students listened to three cases of abnormal or adventitious lung sounds on "Mr. Lung" through their stethoscopes. Next they answered questions corresponding to the portion and quality of the sounds. Then, we explained the correct answers and how to differentiate lung sounds on "Mr. Lung". Additionally, at the beginning and the end of the lecture, five degrees of self-assessment for the auscultation of the lung sounds were performed. The ratio of correct answers for lung sounds were 36.9% for differences between bilateral lung sounds, 52.5% for coarse crackles, 34.1% for fine crackles, 69.2% for wheezes, 62.1% for rhonchi and 22.2% for stridor. Self-assessment scores were significantly higher after the class than before. The ratio of correct lung sound answers was surprisingly low among medical students. We believe repetitive auscultation of the simulator to be extremely helpful for medical education.

Auscultation↗

Accuracy and reliability of 'specialized' physical therapists in auscultating tape-recorded lung sounds.

This study investigated the accuracy and inter-rater reliability of 'specialized' physical therapists in the auscultation of tape-recorded lung sounds. In addition, a correlation was investigated between accuracy of interpretation and the number of years of specialization in the field of cardiorespiratory physical therapy. This research follows an earlier study which investigated the accuracy and inter-rater reliability of auscultating tape-recorded lung sounds in a 'non-specialized' cohort of physical therapists. The subjects were 26 'specialized' cardiorespiratory physical therapists working in acute urban teaching hospitals. These individuals were required to have been practising currently and exclusively for at least one year in the area of cardiorespiratory physical therapy. Participants listened with a stethoscope to five different sounds and identified them from a standardized list of terms. One of three tapes with the same lung sounds in different order was randomly selected for each physical therapist. The percentage of correct answers for all subjects was calculated. An accurate response in the detection of lung sounds was arbitrarily defined as a percentage of correct answers of 70% or greater. The difference between the pooled correct response rate of 50% and the arbitrarily set value of 70% was statistically significant (z = 2.23, p < 0.05), indicating that the 'specialized' physical therapists were not accurate in identifying lung sounds. There was no relationship evident between the accuracy and the number of years of cardiorespiratory 'specialization' (r = 0.08). Analysis of inter-rater reliability revealed 'fair agreement' (kappa = 0.26) among subjects. These results were similar to those found in the previous study.(ABSTRACT TRUNCATED AT 250 WORDS)

Auscultation↗

High-tech house calls.

Think of telemedicine as a stethoscope that electronically links doctors and patients. But before the long-distance diagnosis becomes reality, telemedicine must overcome legal, financing and regulatory obstacles.

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

From early wireless to Everest.

Medical information has been transmitted using wireless technologies for almost 80 years. A "wired wireless" electronic stethoscope was developed by the U.S. Army Signal Corps in the early 1920's, for potential use in ship-to-shore transmission of cardiac sounds. [Winters SR. Diagnosis by wireless. Scientific American June 11, 1921, p. 465] Today, wireless is used in a wide range of medical applications and at sites from transoceanic air flights to offshore oil platforms to Mt. Everest. 'Wireless LANs' are often used in medical environments. Typically, nurses and physicians in a hospital or clinic use hand-held "wireless thin client" pen computers that exchange patient information and images with the hospital server. Numerous companies, such as Fujitsu (article below) and Cruise Technologies (www.cruisetech.com) manufacture handheld pen-entry computers. One company, LXE, integrates radio-frequency (RF) enhanced hand-held computers specifically designed for production use within a wireless LAN (www.lxe.com). Other companies (Proxim, Symbol, and others) supply the wireless RF LAN infrastructure for the enterprise. Unfortunately, there have been problems with widespread deployment of wireless LANs. Perhaps the biggest impediment has been the lack of standards. Although an international standard (IEEE 802.11) was adopted in 1997, most wireless LAN products still are not compatible with the equipment of competing companies. A problem with the current standard for LAN adapters is that throughput is limited to 3 Mbps--compared to at least 10 Mbps, and often 100 Mbps, in a hard-wired Ethernet LAN. An II Mbps standard is due out in the next year or so, but it will be at least 2 years before standards-compliant products are available. This story profiles some of the ways that wireless is being used to overcome gaps in terrestrial and within-enterprise communication.

Emergencies↗

Accuracy of the SpaceLabs Medical 90217 ambulatory blood pressure monitor.

OBJECTIVE: To test the SpaceLabs Medical 90217 ambulatory blood pressure monitor for compliance with The Association for the Advancement of Medical Instrumentation's standard and a modification of the British Hypertension Society (BHS) protocol. METHODS: The study concerned 85 subjects aged 17-88 years with various arm circumferences and ranges of blood pressure. Resting casual blood pressure was 135 +/- 24/76 +/- 14 mmHg (mean +/- SD). For each subject nine readings of the 90217 device were compared with auscultatory reference readings of two independent observers who used a dual stethoscope. The measurements were performed with subjects standing, sitting and supine. The manual reference readings were alternated with the 90217 monitor's readings. RESULTS: Average differences between manual (average of recordings by two clinicians) and automated readings were -5 +/- 4.3/0.6 +/- 4.6 mmHg (seated), 0.0 +/- 6.0/-1.8 +/- 4.7 mmHg (standing) and -1.6 +/- 5.1/-0.7 +/- 5.1 mmHg (supine).CONCLUSIONS: The device meets the Association for the Advancement of Medical Instrumentation's standard. Comparing the results with the modified BHS protocol, it was found that the device earned the highest BHS grade of 'A' both for systolic and for diastolic blood pressures.

Journal Article↗

Increasing observer objectivity with audio-visual technology: the Sphygmocorder.

The most fallible component of blood pressure measurement is the human observer. The traditional technique of measuring blood pressure does not allow the result of the measurement to be checked by independent observers, thereby leaving the method open to bias. In the Sphygmocorder, several components used to measure blood pressure have been combined innovatively with audio-visual recording technology to produce a system consisting of a mercury sphygmomanometer, an occluding cuff, an automatic inflation-deflation source, a stethoscope, a microphone capable of detecting Korotkoff sounds, a camcorder and a display screen. The accuracy of the Sphygmocorder against the trained human observer has been confirmed previously using the protocol of the British Hypertension Society and in this article the updated system incorporating a number of innovations is described.

Journal Article↗

A new electronic sphygmomanometer: testing observer reliability and instrument comparability.

A new electronic sphygmomanometer, Visomat II, featuring a new microphone sound chamber and signal light as a substitute for stethoscope use, was tested in two experiments. The study first measured the degree to which two persons observing the same instrument would have similar readings. Standard aneroid and mercury instruments were also tested. This was done to compare readability of the three scales. There were no statistically significant differences in the readings of the three types of units. In the second experiment, pairs of different sphygmomanometers were connected with Y fittings. Technicians compared in random order the similarity of readings of the three possible pairs of units. There were no statistically significant differences in the three pairings. The authors conclude that the new electronic instruments is comparable to the standard aneroid and mercury units.

Blood Pressure Determination↗

[Qualitative function test of ventriculo-atrial drainage using Cordis-Hakim valves].

Description of the acoustic detection of the functional performance of Cordis-Hakim valves. This can be monitored or perceived with a surface microphone, or demonstrated by means of an oscilloscope. To document the findings the image of the viewing screen can be photographed or continuously registered through interconnection of a recorder. There is also the possibility of testing with the stethoscope. The construction of the device and experimental arrangements are described.

Acoustics↗