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The glucose area under the profiles obtained with continuous glucose monitoring system relationships with HbA(lc) in pediatric type 1 diabetic patients.

OBJECTIVE: The purpose of this study was to determine whether the continuous glucose monitoring system (CGMS) (MiniMed, Sylmar, CA) 1) is sufficiently representative of the overall metabolic control as assessed by HbA(1c), 2) could be used to identify a particular blood glucose threshold value affecting hemoglobin glycation; and 3) is able to show any relationship between particular glycemic profiles and HbA(1c) levels. RESEARCH DESIGN AND METHODS: Of 44 pediatric patients with type 1 diabetes who wore CGMS devices, 28 subjects were selected for the study. Criteria for inclusion were high levels of HbA(1c) (> or =8%) for more than 1 year or a history of frequent hypoglycemic episodes and a complete CGMS registration for 72 h. Age of the subjects ranged from 5.7 to 24.8 years, the mean duration of disease was 7.63 +/- 4.75 years, and the mean HbA(1c) value was 8.7 +/- 1.3%. CGMS data were downloaded and glucose profiles were analyzed. The area under each glucose profile was calculated by means of a professional digital planimeter. RESULTS: The glucose profiles showed a high frequency of prolonged hyperglycemic periods (80% of subjects) and a low frequency of postmeal glycemic peaks (29% of subjects). Postlunch values were significantly correlated with HbA(1c) levels, but the correlation disappeared when controlling for glucose area values. Glucose area values significantly correlated with HbA(1c) levels both when considered as a whole (40-400 mg/dl; r = 0.53, P = 0.002) and when considered fractioned (40-150, 40-200, 40-250, 40-300 mg/dl), apart from the 40-90 mg/dl partial area. HbA(1c) levels were significantly decreased 3 and 6 months after use of CGMS (P = 0.05 and 0.03, respectively, paired Student's t test). CONCLUSIONS: HbA(1c) levels may be decreased by using the information obtained with the CGMS. Three-day glucose profiles are representative of the overall glucose control, because glucose area values correlate with HbA(1c) levels. The only glucose threshold below which there seems to be no correlation with HbA(1c) is 90 mg/dl. Only glucose area, and not postprandial glucose values, are directly and independently correlated with HbA(1c). Therefore, to improve metabolic control, it is necessary to lower the whole mean 24-h glycemia and not just the postprandial glucose values.

Adolescent↗

Pathologic effects in brain after intracranial pressure monitoring in clinically normal dogs, using a fiberoptic monitoring system.

During 2 separate studies, intracranial pressure (ICP) was measured in 13 healthy dogs (group A, n = 7; group B, n = 6), using a fiberoptic monitoring system implanted surgically in the right superficial cerebral cortex. Average ICP was measured for 15 minutes after a 15-minute postimplantation period of equilibration. Intracranial pressure was measured in group-A dogs at 2.0 and 1.3% end-tidal isoflurane concentrations. Mean +/- 1 SD ICP in group-A dogs at 2.0 and 1.3% end-tidal isoflurane concentrations was 11 +/- 2 and 11 +/- 3 mm of Hg, respectively. Dogs of group A were euthanatized immediately after measurements were obtained. Mean ICP +/- 1 SD in group-B dogs was 11 +/- 3 mm of Hg. After monitoring, but prior to euthanasia, group-B dogs underwent callosotomy, and were maintained for 30 days after surgery. The brain was removed from all dogs, formalin fixed, and examined grossly and microscopically for lesions associated with fiberoptic cable implantation. Variable degrees of hemorrhage and mechanical brain damage were seen focally around the catheter site in all brains from group-A dogs, especially when the cable entered through a sulcus. In 1 dog, local vacuolation was seen in the brain immediately adjacent to the tract associated with implantation of the fiberoptic catheter. In all other dogs, the additional cortex was histologically normal. Histologic lesions associated with cable implantation were not observed in group-B dogs.

Animals↗

Validity of self-reported use of assisted reproductive technology treatment among women participating in the Pregnancy Risk Assessment Monitoring System in five states, 2000.

OBJECTIVES: To assess the validity of a question on assisted reproductive technology (ART) incorporated into the Pregnancy Risk Assessment Monitoring System (PRAMS) in 2000. While the intent of the question is to ascertain whether the index infant was conceived using ART, the phrasing was ambiguous for women who had used ART while trying to conceive the index infant but became pregnant after discontinuing treatment. METHODS: We compared weighted PRAMS estimates from five states that incorporated the ART question in 2000 with data from the U.S. ART Surveillance System (ART-SS) maintained by the Centers for Disease Control and Prevention (CDC). U.S. medical practices are mandated to report data for every ART procedure to CDC annually; thus, the ART-SS is highly specific and complete. RESULTS: ART use was reported for 156 of the PRAMS births in our study population, representing 4,571 (95% Confidence Limit, 3,452-5,690) births from the total birth cohort in the five states of interest in 2000. For the same maternal residency states and year, 1,768 births were reported to the ART-SS. Thus, we calculate that PRAMS overestimated ART use by 2,803 births. PRAMS estimated 2.59 times as many ART births as reported to the ART-SS. While for singletons, a large excess in estimated births from PRAMS was observed (ratio=3.50), there was little difference between the PRAMS estimates and ART-SS for twin and triplet births. CONCLUSION: These findings suggest women responding to PRAMS may be reporting past ART use in addition to current. The findings by plurality support this hypothesis.

Birth Weight↗

Use of the CDI blood parameter monitoring system 500 for continuous blood gas measurement during extracorporeal membrane oxygenation simulation.

UNLABELLED: The Oximetrix III Opticath (Abbott Critical Care Systems) is used for continuous measurement of venous saturation in a variety of applications, including extracorporeal membrane oxygenation (ECMO), despite clinical reports that have presented data showing poor accuracy of these devices. The CDI Blood Parameter Monitoring System 500 (Terumo) is an inline blood gas monitoring tool commonly used during cardiopulmonary bypass procedures to continuously assess oxygen saturation, blood gases, potassium, and bicarbonate. The purpose of this experiment was to compare the Opticath and the CDI 500 in trending venous blood saturation during a simulation of ECMO. An ECMO simulation circuit consisting of a silicone rubber membrane oxygenator and a stainless steel heat exchanger was constructed, and a standard venous reservoir bag was used to represent the patient. The CDI and the Opticath were incorporated side by side into a shunt that originated just before the oxygenator and returned flow to the venous line. The circuit was primed with fresh porcine blood and conditioned with the addition of CO2 to simulate typical venous blood under ECMO conditions. After an initial calibration procedure, samples were drawn and analyzed by an AVL Opti CCA (Roche/Osmetech) every 4-8 hours for a period of 7 days, with calibration of each device at sample intervals. The data were plotted, and a least squares regression line was calculated. The average error for venous saturation of the CDI and Opticath after 72 hours was 3.86 and 9.51 respectively. At 168 hours, error for the CDI was 8.37, and the Opticath had an error of 14.78. A correlation analysis of the CDI and AVL CCA analyzer yielded a correlation coefficient of r = .88 at 72 hours and r = .84 at 168 hours. Correlation between the Opticath and the AVL CCA yielded a correlation coefficient of r = .77 at 72 hours and r = .55 at 168 hours. Based on these findings, the CDI 500 is an effective tool for monitoring venous blood saturation under simulated conditions of ECMO. KEYWORDS: CDI 500, Opticath, extracorporeal membrane oxygenation, venous saturation.

Blood Gas Analysis↗

Unrecognised hypoglycaemia in children and adolescents with type 1 diabetes using the continuous glucose monitoring system: prevalence and contributors.

AIM: To determine prevalence of hypoglycaemia, and contributing factors, in children with type 1 diabetes, using the Medtronic MiniMed continuous glucose monitoring system (CGMS). METHODS: Fifty-one children and adolescents with diabetes were studied with the CGMS. The studies were analysed for frequency and duration of hypoglycaemia (below 3.5 and 2.5 mmol/L). Contributing clinical factors were determined. Occurrence of nocturnal hypoglycaemia was related to bedtime and fasting home glucose recording. RESULTS: Hypoglycaemia was common, with 1 (0-4.2) (median (range)) episode per patient per 24 hours, and 0.33 (0-2) episodes per patient per night. Nocturnal episodes were longer than daytime episodes [97.5 (5-720) versus 35 (5-295) minutes for episodes below 3.5 mmol/L, P < 0.001; and 75 (10-640) versus 25 (5-200) minutes for episodes below 2.5 mmol/L, P < 0.001], and less likely to be recognised by the subject (P < 0.001 for episodes below both 3.5 and 2.5 mmol/L). Nocturnal hypoglycaemia was more common with a bedtime glucose recording <6 mmol/L, but also occurred frequently in subjects with glucose recordings >10 mmol/L. No bedtime glucose value reduced the risk of nocturnal hypoglycaemia to <10%. CONCLUSION: Hypoglycaemia, assessed using the CGMS, is common in children with type 1 diabetes and can be prolonged (although is predominantly mild). Bedtime home glucose recordings are poorly predictive of hypoglycaemia during the following night. Continuous glucose monitoring has proven very useful in management of individual patients, particularly adolescents experiencing difficulties with adherence to diabetes management.

Adolescent↗

Application of ubiquitous computing in personal health monitoring systems.

A possibility to significantly reduce the costs of public health systems is to increasingly use information technology. The Laboratory for Information Processing Technology (ITIV) at the University of Karlsruhe is developing a personal health monitoring system, which should improve health care and at the same time reduce costs by combining micro-technological smart sensors with personalized, mobile computing systems. In this paper we present how ubiquitous computing theory can be applied in the health-care domain.

Computer Communication Networks↗

Preliminary results of a monitoring system to confirm the preservation of cavernous nerves.

BACKGROUND: It is important to preserve the neurovascular bundle (NVB) during nerve-sparing surgery. This article presents the preliminary results of our monitoring system for the postoperative preservation of erectile function. METHODS: In 15 patients undergoing radical prostatectomy and 20 patients undergoing radical cystoprostatectomy, intraoperative electrical stimulation along the NVB was performed to measure changes in intracavernous pressure before and after prostate removal. Seven of the radical prostatectomy patients and eight of the radical cystoprostatectomy patients underwent nerve-sparing surgery. Postoperative erectile function was evaluated in 25 patients not receiving adjuvant hormonal therapy. RESULTS: The NVB was judged to be preserved at least on one side electrophysiologically in 14 of 15 patients. Pathologically, three patients had pT3 cancer. Postoperatively, sufficient erectile function was demonstrated using the International Index of Erectile Function 5 in three patients, nocturnal penile tumescence in three patients, and a questionnaire or an interview in three patients. The other patients were incompletely erectile. None of the 11 patients not receiving adjuvant hormonal therapy, in whom NVB was not preserved, were erectile. CONCLUSION: If the successful criterion of nerve-sparing surgery is defined as a change in intracavernous pressure of 4 cm H2O or more being observed at least unilaterally, and the successful criteria of erectile function preservation includes being sufficiently erectile as revealed by an interview, the sensitivity of our system was 69.2% (9/13) and the specificity was 100% (12/12). Neither adverse reactions to the measurement, nor inadequacy of cancer excision accompanying NVB sparing, were observed. These results suggest that our system can predict postoperative erectile function fairly accurately.

Aged↗

Establishing and using a community inter-agency client monitoring system to develop addictions treatment programs.

The Substance Abuse Monitor is a comprehensive community-based addictions information system that forms the basis for an innovative approach to community needs assessment. This paper describes: (1) the conditions that created the need and support for the monitoring system; (2) the community development strategy that was employed to secure the commitment of agencies to the project; (3) the specifics of the needs assessment procedures; (4) some of the theoretical, clinical and methodological issues on which the procedures are based; (5) the practical applications of the system; and (6) the limitations of the system. The establishment of the database was based upon the idea that there would be benefits at several levels: the community, the participating agencies, the individual counsellors and the clients. The realization of these benefits requires that the information collected and the results generated must be capable of addressing specific service delivery problems with practical and tangible solutions. It is argued that the project has been successful in generating such solutions, and has considerable potential as an ongoing needs assessment tool.

Adult↗

Evaluation of metabolic control in women with gestational diabetes mellitus by the continuous glucose monitoring system: a pilot study.

OBJECTIVE: To evaluate the blood glucose concentrations in a group of women with gestational diabetes mellitus (GDM), by the use of a continuous glucose monitoring system (CGMS). METHODS: Seven women with diet-controlled GDM (group G1), 5 with diet- and insulin-controlled GDM (group G2), and 7 healthy, pregnant women (group N) were included in the study. The treatment was adjusted on the basis of self-monitoring of blood glucose (SMBG). The self-monitoring was performed 4 times a day, with the goals of fasting blood glucose values of <90 mg/dL and postprandial (2 hours after each meal) values of <120 mg/dL. Then patients were submitted to a 72-hour period of use of the CGMS. RESULTS: In the 3 study groups--N, G1, and G2, respectively--no significant differences were noted in individual study parameters, measured with the CGMS in regard to the following: mean 24-hour glycemia (85, 87, and 91 mg/dL), fasting blood glucose (79, 88, and 82 mg/dL), postprandial glucose (96, 97, and 105 mg/dL), mean glucose level during the night (77, 71, and 75 mg/dL), and area under the glycemia curve (281, 315, and 310). Moreover, no significant difference was found in the total duration of glycemia below 60 mg/dL (317, 300, and 370 minutes) or the duration of glycemia of more than 120 mg/dL (259, 225, and 394 minutes) in group N, G1, and G2, respectively. With use of the CGMS, however, in comparison with SMBG, a wider range of glycemic levels was observed in all 3 study groups: for the healthy, pregnant women, 41 to 194 mg/dL versus 61 to 151 mg/dL; for G1, 40 to 244 mg/dL versus 40 to 180 mg/dL; and for G2, 40 to 173 mg/dL versus 50 to 157 mg/dL. CONCLUSION: The therapy, based on SMBG levels, when applied to the group of women with GDM, brought the glucose levels under effective control, with mean outcome values similar to those observed in the group of normal pregnant women. Nevertheless, using the CGMS, we detected long, asymptomatic periods of high and low blood glucose levels, both in the patients with GDM and in the unaffected pregnant women. The use of the CGMS for monitoring blood glucose profiles might be beneficial in this group of pregnant women.

Adult↗

Accuracy of the continuous glucose monitoring system in inpatient and outpatient conditions.

OBJECTIVE: To evaluate in inpatient and outpatient conditions, using only non-calibration data, the accuracy of the Continuous Glucose Monitoring System (CG-MS). RESEARCH DESIGN AND METHODS: Twelve, 21 and 20 type 1 diabetic patients participated in 3- day inhospital, 6-day ambulatory (i.e., 2 sensors worn consecutively) and 3-day ambulatory studies. Capillary glucose tests (7-8/day) served as comparisons. Pairs of data (excluding the 4 daily pairs used automatically by the CGMS for calibrations) were analyzed using correlation coefficient, error -grid analysis, and mean of absolute differences. RESULTS: Two third and half of the sensing days were qualified as "optimal", i.e., interpretable by the CGMS program in the inpatient and outpatient studies, respectively. Correlation coefficient was 0.92, 0.81 and 0.73 in the inpatient, 6 day outpatient and 3-day outpatient studies. 98%, 93% and 96% of the data fell in the A or B error-grid "clinically acceptable" zones. Mean absolute differences between sensor and glucometer values were 25 +/- 2, 34 +/- 5 and 32 +/- 5 mg/dl. CONCLUSION: CGMS may be used for assessment of glycemic trends, though accuracy is more in the range of glucometers than of laboratory tests. Inhospital utilisation improved accuracy and 6-day rather than 3-day sessions may be more appropriate to evaluate day to day reproducibility of glucose profile.

Automation↗

Hazardous information from bedside fast-flush device test for fluid-filled pressure monitoring systems.

The fast-flush device test--based on the square-wave principle--has been used in clinical practice to test the accuracy of fluid-filled pressure-monitoring systems. One assumption with the square-wave test is that the system is a second-order approximation. To elucidate the problem, the authors compared, in vitro, a reference test method (frequency response test), valid for second-order systems, with a pure square-wave test and a fast-flush device test. They showed that the two tested systems did not have any relation to the reference system, which suggests that the second-order approximation is not valid. Therefore, the fast-flush device test cannot be used reliably in testing the total chain of catheter, tubing, transducer, and monitor for invasive pressure measurement.

Blood Pressure Determination↗

A web-based self-monitoring system for people living with HIV/AIDS.

Available evidence indicates that the internet is becoming the main source for delivering information on the prevention, control and treatment of HIV/AIDS. This paper presents a further step in the use of the internet to meet the new challenge of managing HIV as a chronic illness. It describes a work carried out under the SEAHORSE EU project to build and test a Web-based self-monitoring system for HIV/AIDS patient care. The user interface has been carefully designed to provide a high-level of interaction and therefore improve some of the current limitations of Web applications. The system comprises three modules: (1) a patient self-monitoring personal diary, to create a follow-up patient record; (2) a data analysis and visualisation tool; and (3) a section to allow patients to ask for advising and remote doctor support. One of the crucial system design issues has been the system security and users anonymity features required in this clinical domain. A feasibility pilot has been carried out to test the system in three organisations involved in the research project: the Immune Development Trust (London), the Lambeth, Southwark and Lewisham Health Authority (London) and Apoyo Positivo in Madrid. The preliminary results of the system evaluation show the potential validity and usefulness of the tool for helping people living with HIV/AIDS to promote and manage their health and for providing health professionals with new means for tele-monitoring and tele-caring patients.

Acquired Immunodeficiency Syndrome↗

A possible population monitoring system on environmental mutagens: statistical studies on retinoblastoma in Japan.

Because an increasing number of environmental mutagens have been detected by laboratory screening, the need to monitor human populations directly for mutational risk has been emphasized by many geneticists. They have proposed various monitoring systems but none of them has been practically applied because a large number of samples would need to be studied systematically in such systems. Recent studies by KNUDSON on some malignant tumors give hope that these diseases might be used to assess somatic mutation rates, as suggested by SUTTON (1972). According to KNUDSON, the age of first diagnosis of the diseases may be related to the annual somatic mutation rate. The ages of first diagnosis of unilateral and bilateral retinoblastomas have been compared among four university hospitals in Japan for cases since 1965. Three different types of analysis have been tried: (1) normal distribution; (2) KNUDSON's method; and (3) a modification of VERSCHUER's method for calculating penetration. The age at diagnosis of unilateral cases has fallen in the past ten years. A significant difference in the age of first diagnosis in bilateral retinoblastoma has been found in a hospital in Japan. The changes observed may result from the increased rate of somatic mutations induced by some environmental mutagens.

Age Factors↗

Improvement in diabetes control with a monitoring system based on a hand-held, touch-screen electronic diary.

We conducted a six-month prospective interventional crossover study examining a computerized diabetes monitoring system (DMS) that conveyed dietary information. The objectives were to compare glycaemic control between intervention and control periods, and to assess patients' acceptance of the DMS. Nineteen patients were randomized into two groups, each using the DMS for three months and serving as the control group for another three months. The patients recorded information about their meal portions and blood glucose readings in a hand-held electronic diary. After transmitting the data to the DMS through a telephone modem, the patients received immediate feedback about the carbohydrate, protein and fat content of the meal, as well as the calorie content. A significant improvement in glycaemic control was achieved during intervention compared with control periods (mean HbA1C reduction of 0.825%). The DMS was also highly acceptable: 95% patients found it easy to operate while 63% found it useful. The DMS was thus a feasible model of telemedicine in diabetes care and a larger study is warranted to examine its cost-effectiveness.

Adult↗

[Characteristics of the daily blood glucose profiles of impaired glucose tolerance and type 2 diabetes mellitus subjects by continuous glucose monitoring system].

OBJECTIVE: To investigate the characteristics of daily glucose profiles of the impaired glucose tolerance (IGT) and type 2 diabetes mellitus (T2DM) subjects by continuous glucose monitoring system (CGMS) so as to instruct the development of rational programs of treatment. METHODS: The CGMS data of 6 normal glucose tolerance (NGT), 10 IGT, and 20 newly diagnosed T2DM subjects were analyzed. RESULTS: (1) The values of average blood glucose, standard deviation of blood glucose, total time of plasma glucose > or = 7.8 mmol/L (T(PG) > or = 7.8 mmol/L) of the T2DM subjects were all significantly higher than those of IGT subjects (all P < 0.05), and these values of the IGI subjects were all significantly higher than those of the NGT subjects (all P < 0.05). The CGMS blood glucose profile excursion were also more and more fluctuant with the deterioration of glucose tolerance. (2) In the IGT group, the time of PG reaching peak was 109 minutes +/- 32 minutes and the daily time of PG > or = 7.8 mmol/L was 3.0 hours +/- 0.8 hours. In the newly diagnosed T2DM group, the time of PG reaching peak was 92 minutes +/- 22 minutes, and the daily time of PG > or = 11.1 mmol/L was 12.6 hours +/- 1.3 hours. The blood glucose increased more quickly and more sharply, and continued for more time after breakfast. CONCLUSIONS: (1) CGMS data accurately display the characteristics of daily 24 h blood glucose profiles of the IGT and newly diagnosed T2DM subjects, and CGMS examination helps instruct the development of rational treatment program. (2) In daily life, the time of PG > or = 7.8 mmol/L in IGT subjects was nearly 3 hours. (3) With the deterioration of glucose tolerance, the postprandial glucose peak is elevated higher and more rapidly, and the daily blood glucose profile excursion becomes more and more fluctuant.

Blood Glucose↗

[Continuous glucose monitoring system, as a valuable tool in the care of children and adolescents with diabetes mellitus].

INTRODUCTION: Good metabolic control of diabetic patients is mainly based on the results of self measured blood glucose levels. Important excursions of blood glucose may, however, be hidden in the usual case of 4-5 daily determinations. The aim of this paper was to give detailed information about this new diagnostic tool and to report the first Hungarian pediatric experiences with continuous glucose monitoring. METHOD: Continuous glucose monitoring system (Mini-Med) is able to monitor the changes of tissue glucose levels for up to 72 hours by measuring glucose concentration via a s.c. canula every 5 minutes. In its present form the results of continuous glucose monitoring cannot be observed real time by the patient, it provides useful information retrospectively mainly for the doctor. RESULTS: The sensor detected unexpectedly high fluctuation of glucose levels in several patients. It was possible to distinguish between nighttime hypoglycaemia (Somogyi-effect) or dawn phenomenon-induced morning hyperglycaemiae by the use of continuous glucose monitoring. Fever may influence peripheral circulation representing a limitation in the use (or evaluation) of continuous tissue glucose monitoring. The authors found good correlation between continuous glucose monitoring and self blood glucose monitoring results. The best correlation was observed in the low blood glucose range. CONCLUSIONS: The continuous glucose monitoring results provide useful information for the diabetologist in order to modify insulin treatment. Continuous glucose monitoring-based changes in insulin treatment are reported to result in better long term metabolic control. Continuous glucose monitoring in the near future will obviously play a primary role in insulin pump therapy where it will provide glucose result for the pump.

Adolescent↗

Who is breast-feeding? Recent trends from the pregnancy risk assessment and monitoring system.

OBJECTIVE: To examine breast-feeding initiation and continuation among women with recent live births in 10 states. STUDY DESIGN: By using Pregnancy Risk Assessment and Monitoring System surveillance data (n = 96,204), we assessed breast-feeding initiation and continuation for > or =10 weeks among women with recent deliveries from 1993 to 1998. We used 1993 as the base for comparing results by using univariate and multivariate analyses. RESULTS: Ten states showed a significant increase of 18% in initiation of breast-feeding from 1993 to 1998, from 57.0% (95% confidence interval [CI], 55.6-58.4) to 67.5% (95% CI, 66.1-68.9). Initiation increased among vulnerable groups such as low-income and black women, participants in the Special Supplemental Nutrition Program for Women, Infants, and Children program, and mothers of infants admitted to the neonatal intensive care unit. The percentage of women predominantly breast-feeding at > or =10 weeks among women who initiated remained stable: 58.5% (95% CI, 56.5-60.5) in 1993 and 57.9% (95% CI, 56.0-59.8) in 1998. More women in vulnerable groups initiated breast-feeding, but those from higher socioeconomic groups continued breast-feeding. CONCLUSIONS: Breast-feeding initiation significantly increased, and several states exceeded the year 2010 objective. Breast-feeding continuation among women who initiated remained stable; however, gaps remained, indicating a continued need to implement breast-feeding promotion programs.

Adult↗