Cutaneous Blood Flow and Local Sweating After Systemic Atropine Administration

Cutaneous Blood Flow and Local Sweating After Systemic Atropine Administration
Author: Margaret A. Kolka
Publisher:
Total Pages: 24
Release: 1986
Genre:
ISBN:

Localized cutaneous vasodilation (flush) is seen following systemic atropine administration. To verify calculated enhanced dry heat loss with actual changes in cutaneous blood flow, four men were studied in both control and atropine experiments during moderate exercise. Esophageal temperature (Tes) and arm sweating (ms) by local dewpoint were measured continuously. Skin (forearm) blood flow (FBF) was measured twice each minute by venous occlusion plethysmography. Injection of atropine (2 mg) caused an increased sensitivity in FBF to Tes with no change in the vasodilator threshold. An elevated Tes onset for sweating occurred with no change in the sensitivity of ms to Tes. No elevation in either forearm or Tsk occurred before the onset of vasodilation, however, both mean skin (Tsk) and local arm temperatures were higher in the atropine experiments after 15 minutes of exercise. Systemic atropine resulted in higher cutaneous vasodilation at the same core temperature with the local skin temperature following passively. The effect of systemic atropine in simulation of increased cutaneous vasodilation is suggested to result by a combination of central and local response which may be mediated through the release of vasoactive substances. Keywords: Anticholinergic drugs; evaporative heat loss; skin blood flow; thermoregulation.

Heat Exchange Through Cutaneous Vasodilation After Atropine Treatment in Two Environments

Heat Exchange Through Cutaneous Vasodilation After Atropine Treatment in Two Environments
Author:
Publisher:
Total Pages: 35
Release: 1987
Genre:
ISBN:

This report summarizes two tightly controlled laboratory studies in which the thermo-regulatory effects of an intramuscular injection of atropine sulfate (2 mg) were compared with a placebo injection of sterile saline during two environmental conditions. Four subjects were tested in each environmental condition (22 C or 30 C) during seated cycle exercise at a moderate exercise intensity (55% VO2 peak). Esophageal temperature (T), mean weighted skin temperature (Tsk), and forearm sweating rate (ms) were continuously measured during 30 minutes of rest and 35 minutes of exercise. Skin blood flow (FBF) from the forearm was measured twice each minute by venous occlusion plethysmography. The expected decrease in whole body and local sweating rate ( -60%) occurred in both environments in the atropine treated subjects. The increased skin blood flow compensated for the suppression in sweating increasing dry heat loss in the atropine experiments. The atropine-induced vasodilation was widespread as skin temperatures increased at all sites measured. These results suggest that the peripheral modification of cutaneous blood flow which occurs in atropine treated subjects is sufficient to alter heat exchange in both warm and cool environments.

Biomedical Signals, Imaging, and Informatics

Biomedical Signals, Imaging, and Informatics
Author: Joseph D. Bronzino
Publisher: CRC Press
Total Pages: 1472
Release: 2014-12-16
Genre: Medical
ISBN: 1439825270

Known as the bible of biomedical engineering, The Biomedical Engineering Handbook, Fourth Edition, sets the standard against which all other references of this nature are measured. As such, it has served as a major resource for both skilled professionals and novices to biomedical engineering. Biomedical Signals, Imaging, and Informatics, the third volume of the handbook, presents material from respected scientists with diverse backgrounds in biosignal processing, medical imaging, infrared imaging, and medical informatics. More than three dozen specific topics are examined, including biomedical signal acquisition, thermographs, infrared cameras, mammography, computed tomography, positron-emission tomography, magnetic resonance imaging, hospital information systems, and computer-based patient records. The material is presented in a systematic manner and has been updated to reflect the latest applications and research findings.

Medical Aspects of Harsh Environments

Medical Aspects of Harsh Environments
Author: Kent B. Pandolf
Publisher: U.S. Government Printing Office
Total Pages: 648
Release: 2001
Genre: History
ISBN:

Describes and illustrates the medical conditions caused by heat and cold, including topics ranging from heat illness prevention to the treatment of hypothermia. Provides historical background and current information on the physiology, physical derangements, psychology, prevention, and treatment of heat- and cold-related environmental illnesses and injuries. Contains a color atlas of cold injuries and their treatment.

Medical Infrared Imaging

Medical Infrared Imaging
Author: Mary Diakides
Publisher: CRC Press
Total Pages: 641
Release: 2012-12-12
Genre: Medical
ISBN: 143987249X

The evolution of technological advances in infrared sensor technology, image processing, "smart" algorithms, knowledge-based databases, and their overall system integration has resulted in new methods of research and use in medical infrared imaging. The development of infrared cameras with focal plane arrays no longer requiring cooling, added a new dimension to this modality. Medical Infrared Imaging: Principles and Practices covers new ideas, concepts, and technologies along with historical background and clinical applications. The book begins by exploring worldwide advances in the medical applications of thermal imaging systems. It covers technology and hardware including detectors, detector materials, un-cooled focal plane arrays, high performance systems, camera characterization, electronics for on-chip image processing, optics, and cost-reduction designs. It then discusses the physiological basis of the thermal signature and its interpretation in a medical setting. The book also covers novel and emerging techniques, the complexities and importance of protocols for effective and reproducible results, storage and retrieval of thermal images, and ethical obligations. Of interest to both the medical and biomedical engineering communities, the book explores many opportunities for developing and conducting multidisciplinary research in many areas of medical infrared imaging. These range from clinical quantification to intelligent image processing for enhancement of the interpretation of images, and for further development of user-friendly high-resolution thermal cameras. These would enable the wide use of infrared imaging as a viable, noninvasive, low-cost, first-line detection modality.

Use of Services for Family Planning and Infertility, United States, 1982

Use of Services for Family Planning and Infertility, United States, 1982
Author: Gerry E. Hendershot
Publisher:
Total Pages: 982
Release: 1988
Genre: Birth control
ISBN: 9780840602220

The 1982 statistics on the use of family planning and infertility services presented in this report are preliminary results from Cycle III of the National Survey of Family Growth (NSFG), conducted by the National Center for Health Statistics. Data were collected through personal interviews with a multistage area probability sample of 7969 women aged 15-44. A detailed series of questions was asked to obtain relatively complete estimates of the extent and type of family planning services received. Statistics on family planning services are limited to women who were able to conceive 3 years before the interview date. Overall, 79% of currently mrried nonsterile women reported using some type of family planning service during the previous 3 years. There were no statistically significant differences between white (79%), black (75%) or Hispanic (77%) wives, or between the 2 income groups. The 1982 survey questions were more comprehensive than those of earlier cycles of the survey. The annual rate of visits for family planning services in 1982 was 1077 visits /1000 women. Teenagers had the highest annual visit rate (1581/1000) of any age group for all sources of family planning services combined. Visit rates declined sharply with age from 1447 at ages 15-24 to 479 at ages 35-44. Similar declines with age also were found in the visit rates for white and black women separately. Nevertheless, the annual visit rate for black women (1334/1000) was significantly higher than that for white women (1033). The highest overall visit rate was for black women 15-19 years of age (1867/1000). Nearly 2/3 of all family planning visits were to private medical sources. Teenagers of all races had higher family planning service visit rates to clinics than to private medical sources, as did black women age 15-24. White women age 20 and older had higher visit rates to private medical services than to clinics. Never married women had higher visit rates to clinics than currently or formerly married women. Data were also collected in 1982 on use of medical services for infertility by women who had difficulty in conceiving or carrying a pregnancy to term. About 1 million ever married women had 1 or more infertility visits in the 12 months before the interview. During the 3 years before interview, about 1.9 million women had infertility visits. For all ever married women, as well as for white and black women separately, infertility services were more likely to be secured from private medical sources than from clinics. The survey design, reliability of the estimates and the terms used are explained in the technical notes.

Temperature Regulation

Temperature Regulation
Author: A.S. Milton
Publisher: Birkhäuser
Total Pages: 369
Release: 2012-12-06
Genre: Science
ISBN: 3034884915

Many advances have been made in the field of thermoregulation in the past few years. These include our understanding of Fever, which is now considered not simply a rise in deep body temperature foHowing infection, but just one aspect, though perhaps the most easily measured, of the Acute Phase of the Immune Response. Classification and identification of the Cytokines and the availability of recombinant material has greatly aided this research. Similarly, our understanding of the Hypothalamo-Pituitary Adrenal Axis has altered our way of thinking about temperature regulation. Of importance are the problems associated with adverse climatic conditions and survival, and the problems encountered by the neonate and the hibernator. At the biochemical level, our knowledge of the control of heat production and the role of brown adipose tissue is rapidly advancing. All these issues and many others were discussed at a Symposium 'Thermal Physiology 1993' held in Aberdeen, Scotland in August 1993 under the auspices of the Thermal Physiology Commission of the International Union of Physiological Sciences. Six main aspects of the subject of temperature regulation are included in this book, namely, Fever (including the Acute Phase of the Immune Response and Thermoregulatory Peptides), Neurophysiology of Thermoregulation, Neonatal Thermoregulation, Mechanisms of Heat Production, Ecological and Behavioural Thermoregulation, and Emerging Themes in Thermoregulation.