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Biomedical subjects

M Asmussen

Publications and source records attributed to M Asmussen.

25 records · Page 2Linked to original sources
PubMed1976

A new technique for measurements of the urethra pressure profile.

A new standardized technique for continuous recording of the urethral pressure profile simultaneously with intravesical pressure has been developed. The pressures were recorded using two micr-transducers enclosed in a thin Dacron catheter. The catheter moved with a constant speed through the urethra with the aid of a specially designed instrument. This instrument is described. Twenty-five healthy women were examined. The patients were divided into two groups: (A) 10 postmenopausal women, and (B) 15 fertile women. The results of the recordings showed that the functional length and the absolute length of the urethra could be reproduced with an error of less than 1 mm. The maximal pressure amplitude was significantly less in group A.

Adolescent↗
PubMed1976

Intraurethral pressure recording. A comparison betwen tip-transducer catheters and open-end catheters with constant flow.

This paper presents the results of a comparative study of intraurethral pressure recording with two different catheter systems: (1) Open-end water-filled catheters with constant flow connected to conventional pressure transducers, and (2) Micro-transducers mounted in the tip of a dacron catheter. When open-end catheters were used, the best reproducibility of the urethra pressure profile was obtained, if the catheter dimensions 6-8 F were used and if the flow in the catheters was kept to approximately 1-2 ml/min. In addition, the withdrawal rate of the open-end catheters should not exceed 3-4 mm/sec. The best reproducibility of the intraurethral pressure was obtained with the micro-transducer. It was free from measuring artefacts and seemed from this investigation superior to the open-end catheter systems, both for clinical practice and for research.

Humans↗
PubMed1976

Simultaneous urethro-cystometry with a new technique.

A new technique for studying simultaneous intravesical-intraurethral pressure is described. The basic principle of our technique is pressure recordings with the aid of micro-transducers. These micro-transducers have excellent frequency response, are easy to calibrate and to sterilize and are free from artefacts induced by motion. They permit a more accurate study of the pressures within the bladder and the urethra than catheter-transducer systems described earlier. Using electronical subtraction the closure pressure can easily be measured under static and dynamic conditions. Typical pressure diagrammes obtained with this catheter system are presented.

Female↗
PubMed1975

Simultaneous urethrocystometry and urethra pressure profile measurement with a new technique.

A new technique for simultaneous recording of the pressures within the urethra and urinary bladder is described. The pressures are recorded by microtransducers enclosed in a semiflexible dacron catheter. The recording system has a high frequency response (2000 HZ) and is free of motion-induced artefacts, which makes it possible to measure the urethra pressure profile with a high degree of precision.

Humans↗
PubMed1975

A catheter-manometer calibrator--a new clinical instrument.

Although catheter-manometer systems are widely used in clinical medicine, little effert has been make to evaluate the accuracy of these systems. There is consequently a need for an acceptable method of evaluating the complete pressure recording system under clinical conditions, i.e. a catheter-transducer system that be put together and kept sterilised during the preparation of the patient and applied promptly after static and dynamic calibration of pressure under sterile conditions is described. All kinds of catheters, connectors, transducers, as well as the effect of different fluids or air bubbles on the measuring system, can be investigated. The value of the instrument, especially in clinical practice, is demonstrated and discussed.

Catheterization↗
PubMedDate not supplied

Ovarian radiation dose during dynamic cystourethrography using videorecording and photofluorography.

The ovarian radiation dose in dynamic cystourethrography was estimated by thermoluminescence dosimetry in a phantom and in 26 patients. The urodynamic examination technique was standardized and included fluoroscopy with videorecording and rapid sequence 100 mm fluorography. The examination was performed in the lateral position with dosimeters in the vagina, uterine cavity and rectum. The total dose in the midline was 13 mGy per examination, which compares with 12 mGy in urography.

Adult↗