Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “Microcomputers”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 343 records · Page 19Linked to original sources
PubMed1984

Microcomputer control applied to the Vickers M85/86 microdensitometer.

An electronic interface for a Research Machines 380Z microcomputer and a Vickers M85/6 integrating microdensitometer is described, together with outlines of the control software. A typical applications programme, which may be written in several high-level languages, is outlined for the determination of a time course plot for enzyme activity in a tissue section. This system facilitates rapid accurate measurement and analysis of experimental data.

Computers↗
PubMed1989

A comparison of two microcomputer-based programs for bibliographic retrieval and formatting.

We evaluated two representative microcomputer-based programs for organizing a biomedical literature filing system. With a bibliography of 100 anesthetic references, a series of benchmark tests was developed to measure the speed and accuracy of typical searching, sorting, and formatting tasks. Each program performed the searching tasks accurately and at about the same speed. One program performed sorting without errors, provided the field order of the template used to enter references was unchanged. Both programs used "punctuation files," that is, templates for controlling author presentation; punctuation to suit style requirements of individual journals; and order of particular fields, such as publisher and year of publication. Each program was able to format journal, book, and chapter references correctly, but the resulting output required some refining in a word processor. Both require a major time commitment to learn and to create custom punctuation files for journals not included in the predesigned punctuation files. Once mastered, both programs are quite competent at organizing reprints and formatting journal references.

Humans↗
PubMed1985

The microcomputer: an aid to paediatric parenteral nutrition.

Approximately 50% of the pharmacy man-hours committed to providing a parenteral nutrition service at the Children's Hospital, Birmingham were spent in calculations, form filling and record keeping. An increasing demand for the service, with no extra staff available, meant that the service had to be made more efficient. A 90% time saving was achieved by using a microcomputer to free the pharmacy staff from many of the laborious mathematical and clerical chores. The program was developed by a member of the nutritional care team; this meant that it was designed with the specific needs of the service in mind. In addition the detail and accuracy of patient data recording have been greatly improved.

Child↗
PubMed1989

Development and evaluation of a dual-pump microcomputer-based closed-loop arterial pressure control system.

Hypertension after cardiac surgery is common and is associated with increased morbidity. It is usually managed by the infusion of short acting vasodilators. The use of a closed-loop computer system to control the infusion of a vasodilator has been shown to compare favourably with manual control. We have developed a closed-loop system for the ATARI 1040ST microcomputer to control arterial pressure by the simultaneous infusion of two vasodilators. The control program is based on a proportional-integral-derivative algorithm which has been adapted to allow control of two IMED 929 infusion pumps from one RS-232 port. All communication between the user and computer is carried out with a 'mouse', thus increasing acceptability of the system to ward staff. Cardiovascular data are collected on-line from the patient monitor via a custom-built analogue to digital convertor. This system was used to study glyceryl trinitrate and sodium nitroprusside in 24 patients requiring vasodilators after cardiopulmonary bypass. The study showed that in 14 of the patients hypertension was controlled by GTN alone and 10 required supplementary SNP. We have demonstrated that this dual-pump automatic arterial pressure control system is a satisfactory and safe method of administering two vasodilators simultaneously. It is suitable for both routine clinical and research uses.

Blood Pressure↗
PubMed1986

Fundamentals of feedback control applied to microcomputer instrumentation design.

Feedback control is widely used in applications which range from simple control of room temperature to very sophisticated control of space flight. This paper describes some fundamentals of feedback control as they apply specifically to microcomputer based medical devices. A classical controller is described in its analog and digital implementations. Reference is made to methods for adjusting or tuning the controller for specific applications. Successful applications of adaptive or self-tuning control are discussed. Examples of feedback control include systems to control arterial blood pressure by the infusion of sodium nitroprusside, systems to control arterial carbon dioxide concentration by mechanical ventilation and systems to control depth of anesthesia by controlled anesthesia delivery.

Anesthesia, Inhalation↗
PubMed1984

A microcomputer based charting system for documentation of circulatory, respiratory and pharmacological data during anesthesia.

A system for the on-line production of anaesthetic records with a microcomputer is described. The requirements of the system are a keyboard, a video display unit and a colour plotter. The system requires no programming expertise from anaesthetists and nurses. The records have improved information display, patient care and reduced time spent in administration effort. Disadvantages are the relatively high cost and requirement of preprocessing of haemodynamic and respiratory parameters.

Anesthesiology↗
PubMed1982

Microcomputer-controlled determination of dissociation constants of sulfanilamides and stability constants of the related silver complexes.

As a contribution to the structure-activity relationship of silver sulfanilamide complexes, the pKa-values of thirteen sulfanilamides and the log K-values of their related silver compounds were determined using a microcomputer-controlled titrator which determines the silver ion concentration and hydrogen ion concentration in a combined measurement. Predictions on antibacterial effectiveness and the risk of sensitization reactions of some of the investigated silver sulfanilamides are made on the basis of the conditional stability constants computed from the pKa- and log K-values at pH = 7.4.

Chemical Phenomena↗
PubMed1984

Experience with microcomputer management of a personal medical literature collection.

Microcomputers may be conveniently and effectively used to manage personal medical literature collections. A bibliographic data base consisting of the author, title, and source for each reference is entered and stored on magnetic tapes or disks. Document categorization and keyword assignment prior to entry is optional, thus allowing clerical personnel to maintain both the literature collection and the bibliographic data base. Subject searches using an array of search terms formulated by the medical user permit retrieval of relevant bibliographic citations. Current alphabetical and keyword-in-context listings of the documents in the the collection may also be produced. The programming approach uses string processing and is within the capability of programmers with limited experience.

Computers↗
PubMed1984

Microcomputer-based testing of proficiency with the visual field examination.

A system for computer-assisted instruction in performing ophthalmic visual field examinations is presented. The system is implemented on a microcomputer making use of specially developed algorithms to summarize the information contained in a visual field in a very compact, efficient manner and to determine cursor position relative to stored visual field landmarks. The computer program presents a challenging testing situation by using visual fields, based on those of actual patients, of differing degrees of complexity. It is particularly well suited for trainees as well as for the physicians and ophthalmic technicians who frequently perform this examination.

Computer-Assisted Instruction↗
PubMed1986

A microcomputer program of pulmonary and tissue gas exchange.

A microcomputer program written in BASIC for the IBM-PC and compatibles has been developed to analyze the effects of many parameters on the gas exchange and transport phenomena in the lungs and the tissues. The program is designed for use by medical students and residents concerned with gas exchange (anesthesiology, pulmonary diseases, critical care, etc.) to study the steady state effects on blood and tissue oxygen and carbon dioxide levels. The present program consists of two main subroutines: Pulmonary Gas Exchange and Tissue Gas Exchange. Steady state gas exchange at the lungs can be studied using either a three-compartment model or V/Q relationships. The V/Q subroutine uses single or multiple populations of V/Q distributions to determine gas exchange using a log-normal distribution of V/Q ratios. Other variables can be adjusted which determine the arterial and mixed-venous blood gases. These values are then fed into the second part of the program to analyze factors which determine tissue O2 tension. The Tissue Oxygen Tension subroutine is also subdivided into a modified Krogh-Erlang model, which provides a three-dimensional plot of theoretical capillary and tissue O2 tensions, and a Piiper model which includes the effect of diffusion shunt on O2 tensions and treats the tissue as a well-stirred compartment. Minimal and maximal tissue O2 tensions are calculated using the Piiper model since the intercapillary distance is allowed to vary depending on the O2 delivery by diffusion. Estimates of blood and tissue O2 tensions, diffusion/perfusion coefficients, amount of O2 delivered and the size of the active capillary bed are summarized in a table.

Computers↗
PubMed1985

A microcomputer based controller for neuromuscular block during surgery.

A microcomputer based control system has been developed to automatically induce and maintain neuromuscular block during surgery. The system repeatedly adjusts the infusion rate of a muscle relaxant, succinylcholine, based on the evoked, rectified, and integrated electromyogram (EMG). The system was tested in 12 patients for a 30-min infusion period with a setpoint of 80% depression of the evoked, rectified, and integrated thenar EMG. The mean time to reach the setpoint for 10 of the patients was 5.5 (+/- 1.87 SD) min and the mean time for 95% recovery after infusion was stopped was 5.4 (+/- 0.83 SD) min. Average overshoot was 9.9% of the baseline (+/- 3.1% SD), and the average time within +/- 10% of the setpoint was 22.1 min (+/- 7.26 SD). The total dose of succinylcholine for these 10 patients ranged from 1.21 to 3.77 mg/kg with a mean of 1.92 mg/kg. The other two patients were relatively insensitive to the drug and the controller was unable to bring the response to the setpoint due to a ceiling placed on infusion rate by the control algorithm.

Computers↗
PubMed1993

Microcomputer-based cardiac field simulation model.

Cardiac field simulation is one of the frontier subjects in electrocardiogram theory study. The paper describes a complete cardiac simulation model implemented on an IBM-PC/AT microcomputer. This model uses a new algorithm for excitation propagation simulation. In comparison with the previous rule-based algorithms, the new algorithm shows better in simulation speed and simulation accuracy.

Algorithms↗
PubMed1988

Microcomputer-based system for data acquisition and analysis of oxygen uptake studies.

The use of a Warburg Respirometer to study oxidation reactions is tedious and time-consuming. A microcomputer-based oxygen uptake device that is more sensitive than a Warburg Respirometer is described. The device consists of stainless steel or Teflon reaction vessels coupled to ultrasensitive pressure transducers. A high speed analog to digital convertor is used to poll the transducers. The direct memory access (DMA) controller of an IBM XT is used to poll the convertor and store the data in memory. Software used to program the DMA controller and IBM XT is described. The reproducibility and utility of the device is demonstrated with a brief study of lipid oxidation.

Computer Systems↗
PubMedDate not supplied

Monitoring and improving the content of medical residents' ambulatory care experience: a microcomputer-based method using diagnosis clusters.

Changing patterns of medical practice necessitate increased experience in ambulatory settings for internal medicine residents. Residency program directors must monitor the content and balance of the ambulatory care experience. Evaluation of ambulatory care educational programs requires a concise method of describing the illnesses seen in each outpatient setting and of monitoring individual resident activities. The authors present an easily applied, microcomputer-based method of analysis using diagnosis clusters that has been found to be useful in evaluating and modifying the ambulatory care curriculum at their institution. It provides a concise description of individual ambulatory settings, affords an opportunity to compare each setting with national norms, and identifies areas of inadequate exposure in each resident's experience.

Ambulatory Care↗
PubMed1990

Image processing by microcomputer on ultrastructure of griseofulvin-resistant fungi in favus.

The ultrastructure of 5 griseofulvin-resistant fungi of favus was studied by image processing with microcomputer. It was found that the cell walls of the fungi consisted of 8 layers, and the inner layer containing cytoplasm was loose. It was also found that all structures within the cytoplasm possessed a 1-3 layers integral envelope with chromatins in the nucleus. These might be contributing factors in the development of resistance to griseofulvin. This multiple-layered, thick cell wall might act as a barrier responsible for the impermeability of the cell to griseofulvin.

Drug Resistance, Microbial↗
PubMed1987

A microcomputer implementation of status and alarm algorithms in a cardiac surgical intensive care unit.

Algorithms have been developed for monitoring the cardiovascular status of patients on their return to an intensive care unit after cardiac surgery and also for giving an immediate alarm of a critical deterioration in this status. The two systems for implementing these algorithms were initially developed on Z80 based microprocessor systems and preliminary clinical trials based on the resulting instruments proved encouraging. For further clinical trials of the algorithms the systems have been integrated and implemented on a BBC microcomputer with a 6502 second processor. The development and structure of the programs for implementing the algorithms are described, together with the program input and output facilities and diagnostic techniques used to analyse the information output from the program.

Algorithms↗
PubMed1986

Microcomputer-based system for registration of oxygen tension in peripheral muscle.

For registration of oxygen tension fields in peripheral muscle a microcomputer based system was designed on the M6800 microprocessor. The system was designed to record the signals from a multiwire oxygen electrode, MDO, which is a multiwire electrode for measuring oxygen on the surface of an organ. The system contained patient safety isolation unit built on optocopplers and the upper frequency limit was 0.64 Hz. Collected data were corrected for drift and temperature changes during the measurement by using pre- and after calibrations and a linear compensation technique. Measure drift of the electrodes were proved to be linear and thus the drift could be compensated for. The system was tested in an experiment on pig. To study the distribution of oxygen statistically mean, standard deviation, skewness and curtosis were calculated. To see changes or differences between histograms a Kolmogorv-Smirnov test was used.

Animals↗