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Biomedical subjects

A E Sibley

Publications and source records attributed to A E Sibley.

5 recordsLinked to original sources
PubMed1989

Computerized segmental plethysmography and laser flowmetry.

A new computerized plethysmograph allows segments of the vascular system to be examined accurately and automatically. Laser flowmetry allows blood flow measurements to be made of digital circulation for vascular abnormalities. With the 2 new instruments, large and small vessel circulations can be measured quickly and easily. Disease of these vessels can be readily detected. Thus, appropriate medical or surgical therapy can be investigated.

Adult↗
PubMed1989

Thoracic outlet syndromes--application of microcirculation techniques and clinical review.

The thoracic outlet syndromes of the upper extremities consist of many disorders. The most important two are the costoclavicular syndrome (compression of neurovascular structures between the clavicle and the first rib) and the scalenus anticus syndrome (compression of these structures within the scalene triangle). Congenital abnormalities of the clavicle, congenital small thoracic outlet, high first rib, cervical ribs of all configurations, pectoralis minor and pectoralis major syndromes, and others may occur. The costoclavicular syndrome and scalenus anticus syndrome have been considered the most prevalent compression syndromes and are amenable to surgical or medical treatment. Quantitative measurements of the microcirculation of the fingertip were examined with the shoulders and head in various positions to provide quantitative information relative to the costoclavicular and scalenus anticus syndromes. A laser instrument was ideal for this purpose, for results were quantitative and no counterpressure was applied during the measurement. The technic applied was highly successful in separating quantitatively the normal individuals from those with either costoclavicular syndrome or scalenus anticus syndrome.

Diagnosis, Differential↗
PubMedDate not supplied

Velocity detection of Korotkoff sounds.

High-speed oscillograms were made showing the time relationships between the ECG and arterial pressure waves detected by three microphones successively placed beneath a standard blood pressure cuff along the brachial artery. As the cuff was deflated through the systolic/diastolic range, the indicated propagation velocity of the Korotkoff waves changed from approximately 1 m/sec near systolic pressure to about 2.5 m/sec near diastolic pressure. Non-Korotkoff waves (noise artifacts), on the other hand, were observed to propagate at much higher velocities, on the order of 5-10 m/sec. This phenomenon can be utilized to identify Korotkoff waves in the presence of other disturbances, particularly in exercise situations, and to determine diastolic pressure in the presence of arterially conducted valve and turbulence noise.

Blood Pressure↗