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A Lindbergh perfusion pump, c. 1935, an early device for simulating natural perfusion. Perfusion is the passage of fluid through the circulatory system or lymphatic system to an organ or a tissue, [1] usually referring to the delivery of blood to a capillary bed in tissue. Perfusion may also refer to fixation via perfusion, used in histological ...
Capillary refill time is a quick and cheap way to indicate decreased peripheral perfusion and may indicate cardiovascular or respiratory dysfunction. [5] It has also been used to assess or diagnose diseases of the peripheral circulatory system such as Raynaud's syndrome and hand–arm vibration syndrome . [ 6 ]
Buerger's test is performed in an assessment of arterial sufficiency. It is named after Leo Buerger.The vascular angle, which is also called Buerger's angle, is the angle to which the leg has to be raised before it becomes pale, whilst lying down.
Several factors influence the diver, including immersion, exposure to the water, the limitations of breath-hold endurance, variations in ambient pressure, the effects of breathing gases at raised ambient pressure, effects caused by the use of breathing apparatus, and sensory impairment. All of these may affect diver performance and safety. [1]
Peripheral vasoconstriction largely excludes the skeletal muscles from perfusion during a dive, and use the oxygen stored locally in myoglobin, followed by anaerobic metabolism during a dive. When breathing again, the muscles are perfused and re-oxygenated, and there is a surge in arterial lactate for a short period until reoxygenation stabilises.
A non-return valve in the air supply line to the helmet failing (or absent on the earliest models of this type of diving suit), accompanied by a failure of the air compressor (on the surface) to pump enough air into the suit for the gas pressure inside the suit to remain equal to the outside pressure of the water, or a burst air supply hose.
Prior to heart bypass surgery, the test is performed to assess the suitability of the radial artery to be used as a conduit. A result of less than 3 seconds is considered as good and suitable. A result of between 3–5 seconds is equivocal, whereas the radial artery will not be considered for grafting if the result is longer than 5 seconds. [3]
On the other side Ventilation-perfusion mismatch is the term used when the ventilation and the perfusion of a gas exchanging unit are not matched. The actual values in the lung vary depending on the position within the lung. If taken as a whole, the typical value is approximately 0.8. [4]