journal
https://read.qxmd.com/read/3452741/treatment-of-port-wine-stains-analysis
#21
JOURNAL ARTICLE
M J van Gemert, A J Welch
Port-wine stains (PWS) are bluish red skin stains that are caused by enlarged, ectatic blood vessels in the dermis. Laser treatment of PWS is analyzed from computation of the spatial distribution of heat production by direct absorption of the laser light and subsequent heat conduction. The absorption and scattering caused by oxyhemoglobin, epidermis, and dermis as a function of wavelength are utilized in this analysis. Ideal treatment is defined as coagulating the ectatic blood vessels without irreversible damage to the epidermis and dermis...
August 1987: Medical Instrumentation
https://read.qxmd.com/read/3452740/laser-applications-in-clinical-medicine
#22
JOURNAL ARTICLE
J A Pearce
Laser energy sources have been used in a wide range of clinical applications over the last decade to obtain cutting, coagulation, and denaturization of tissue. The therapeutic effect depends on complex interaction among the optical and thermal properties of tissue and damage accumulation. In applications where localized white coagulum is required, there are trade-offs between continuous activation using a large spot size and repetitive pulses with a small spot size as well as between a highly scattered, deep penetration source and a highly absorbed, shallow penetration laser source...
August 1987: Medical Instrumentation
https://read.qxmd.com/read/3614041/simultaneous-comparison-of-three-noninvasive-oximeters-in-healthy-volunteers
#23
COMPARATIVE STUDY
Y Mendelson, J C Kent, A Shahnarian, G W Welch, R M Giasi
Noninvasive monitoring of arterial hemoglobin oxygen saturation (SaO2) from the Nellcor N-100 and the Ohmeda-Biox 3700 pulse oximeters were compared with SaO2 measured simultaneously by the Hewlett-Packard 47201A ear oximeter. A total of 868 pairs of data points ranging in saturation from 55-100% were obtained from 31 healthy adult volunteers of different ages, sex, skin pigmentation, height, weight, hematocrit, and smoking habits. Steady state and rapidly changing hypoxic conditions were achieved by varying the inspired O2 concentration between 10 and 100%...
June 1987: Medical Instrumentation
https://read.qxmd.com/read/3614040/the-cardiac-ventricular-defibrillation-threshold-inherent-limitations-in-its-application-and-interpretation
#24
JOURNAL ARTICLE
W C McDaniel, J C Schuder
A quantity termed the "threshold" has been used to describe the results of electrical ventricular defibrillation studies, with the implication of a clear distinction between ineffective and effective shock intensities. Although several definitions of the threshold have been suggested, and various methods have been used to quantify it, no comparison of the accuracies of the various methods could be found in the literature. This article, after presenting a method of applying basic probability theory to an assumed distribution relating probability of successful defibrillation to current amplitude, uses the method to examine several popular algorithms for defibrillation-threshold determination...
June 1987: Medical Instrumentation
https://read.qxmd.com/read/3614039/sequential-pulse-defibrillation-in-man-comparison-of-thresholds-in-normal-subjects-and-those-with-cardiac-disease
#25
COMPARATIVE STUDY
D L Jones, G J Klein, G M Guiraudon, A D Sharma, M J Kallok, W A Tacker, J D Bourland
We compared the parameters describing the defibrillation threshold in patients with normal hearts and in patients with ischemic heart disease, using a special electrode system and sequential pulses of current. Twenty-eight patients consented to the study (mean age: 36.6 +/- 10.1 years; mean mass: 80.7 +/- 13.8 kg). Twenty-one patients underwent surgery for Wolff-Parkinson-White syndrome (relatively normal hearts). Six patients had a history of previous myocardial infarction and aneurysm or coronary artery disease; and one patient had been resuscitated from an episode of sudden death, without evidence of consequent myocardial damage...
June 1987: Medical Instrumentation
https://read.qxmd.com/read/3614038/lead-configurations-in-esophageal-electrocardiography
#26
JOURNAL ARTICLE
H Jadvar, J M Jenkins
There are many clinical situations that present the need for special purpose electrocardiography using standard equipment. These include monitoring cardiac activity from temporary myocardial leads implanted following cardiac surgery, detecting signals from intracardiac catheter leads, and noninvasive atrial recording from the esophagus. It is often difficult to connect nonstandard leads and access the individual amplifiers. In this article, we present the case for an esophageal electrode such as the Pill Electrode (Arzco Medical Electronics, Inc...
June 1987: Medical Instrumentation
https://read.qxmd.com/read/3497328/rationale-for-coronary-venous-bypass-grafting-in-patients-with-diffuse-coronary-artery-disease
#27
JOURNAL ARTICLE
M S Hochberg
No abstract text is available yet for this article.
June 1987: Medical Instrumentation
https://read.qxmd.com/read/3614037/comparison-of-the-efficacy-of-defibrillation-with-the-damped-sine-and-constant-tilt-current-waveforms-in-the-intact-animal
#28
COMPARATIVE STUDY
M Hinds, G M Ayers, J D Bourland, L A Geddes, W A Tacker, N Fearnot
The efficacy of defibrillation using the damped sine and constant-tile (60%) truncated exponential waveforms was determined in each of nine dogs. Two measures of efficacy were used to compare the two waveforms: 1) threshold defibrillation current and 2) percent successful defibrillation. For both measures of efficacy, shock strength was expressed in terms of delivered energy. Mean threshold energy was 0.98 J/kg for the damped sine wave and it was 1.24 J/kg for the truncated exponential waveform. Percent successful defibrillation versus energy/kg curves were constructed for each of the waveforms and were found to be essentially the same...
April 1987: Medical Instrumentation
https://read.qxmd.com/read/3614036/zero-stability-of-disposable-and-reusable-pressure-transducers
#29
JOURNAL ARTICLE
V L Gordon, J P Welch, D Carley, R Teplick, R S Newbower
Zero stability tests were performed on contrasting, commercially available, blood pressure-transducer systems. One system was based on a brand of disposable transducer. The others employed one brand of reusable transducer with and without samples of two different brands of compatible disposable domes. Drift was measured at atmospheric pressure over 3-hr periods. Drifts with the disposable transducers and with the bare reusable transducers were small, ranging from -2 to +2 mm Hg over 3 hr. However, the drifts of the reusable transducers with domes were significantly greater, ranging from -11 mm to +5 mm Hg...
April 1987: Medical Instrumentation
https://read.qxmd.com/read/3614035/electrosurgical-dispersive-electrodes-heat-cutaneous-and-subcutaneous-skin-layers
#30
JOURNAL ARTICLE
J Edrich, C C Cookson
Electrosurgical return electrodes can produce heating, and occasionally burns, of cutaneous and subcutaneous skin layers. Up to now, only limited aspects of modern, dispersive, polymer electrodes have been studied using infrared thermography and thermocouples. This report presents new results on a quantitative infrared study, and adds the aspects of subcutaneous effects using microwave thermography as a third dimension. In agreement with previous work in infrared thermography, average cutaneous temperature increases observed in a dozen human volunteers were 1...
April 1987: Medical Instrumentation
https://read.qxmd.com/read/3614034/a-technique-for-localized-tumor-hyperthermia-in-small-animals
#31
JOURNAL ARTICLE
C F Gottlieb, N L Block
Hyperthermia, the intentional elevation of tissue temperature above 41 degrees C, is being intensely researched as a therapeutic modality for cancer, especially when used in combination with radiation therapy and/or chemotherapy. A serious impediment to laboratory progress in this area has been the lack of affordable equipment providing control and reproducibility when faced with highly variable factors including tumor size and shape, blood flow, heat conduction, and tissue dielectric discontinuity. Our solution has been the development of a laboratory microwave hyperthermia system, dedicated to the treatment of small, superficial tumors...
April 1987: Medical Instrumentation
https://read.qxmd.com/read/3614033/fda-evaluates-policy-on-disposable-dialysis-device-reuse
#32
JOURNAL ARTICLE
J C Villforth, M J Miller
No abstract text is available yet for this article.
April 1987: Medical Instrumentation
https://read.qxmd.com/read/3614032/skeletal-muscle-for-heart-repair-or-assistance
#33
JOURNAL ARTICLE
M A Acker, L W Stephenson
No abstract text is available yet for this article.
April 1987: Medical Instrumentation
https://read.qxmd.com/read/3675736/current-concepts-and-clinical-strategies-for-managing-low-birth-weight-infants-under-radiant-warmers
#34
JOURNAL ARTICLE
S Baumgart
No abstract text is available yet for this article.
February 1987: Medical Instrumentation
https://read.qxmd.com/read/3614031/development-of-biomedical-equipment-operator-s-manual
#35
JOURNAL ARTICLE
M J Shaffer, D Sim
No abstract text is available yet for this article.
February 1987: Medical Instrumentation
https://read.qxmd.com/read/3614030/a-low-cost-environmental-chamber-for-temperature-controlled-studies
#36
JOURNAL ARTICLE
E C Walker, T L Talbot, C Mudd
No abstract text is available yet for this article.
February 1987: Medical Instrumentation
https://read.qxmd.com/read/3614029/future-directions-for-device-design-and-infant-management
#37
JOURNAL ARTICLE
P H Perlstein
No abstract text is available yet for this article.
February 1987: Medical Instrumentation
https://read.qxmd.com/read/3614028/impact-of-technology-on-environmental-therapeutic-device-design
#38
JOURNAL ARTICLE
M H Mackin
No abstract text is available yet for this article.
February 1987: Medical Instrumentation
https://read.qxmd.com/read/3614027/incubators
#39
JOURNAL ARTICLE
K H Marks
No abstract text is available yet for this article.
February 1987: Medical Instrumentation
https://read.qxmd.com/read/3614026/environmental-therapeutic-devices-for-infants
#40
JOURNAL ARTICLE
(no author information available yet)
No abstract text is available yet for this article.
February 1987: Medical Instrumentation
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