Collapse

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collapse

[kə′laps]
(engineering)
Contraction of plastic container walls during cooling; produces permanent indentation.
(materials)
The flattening of cells in heartwood during drying or pressure treatment; often characterized by a caved-in or corrugated surface appearance.

Collapse

 

acute vascular insufficiency accompanied by a fall in arterial and venous blood pressure.

Collapse is a result of a disturbance of the regulation of vascular tonus and injury to the vascular walls through infection, intoxication, massive blood loss, severe dehydration, myocardial affection (acute myocardial infarction), and other pathological conditions. Collapse is characterized by a decrease of blood flow to the heart, a deterioration of the blood supply to the vital organs, and the development of hypoxia. The patient’s facial features become pinched and the eyes roll back. He becomes pallid, with sticky perspiration and cold extremities. If the patient is conscious, he lies immobile and indifferent to his surroundings. Breathing is superficial and accelerated. The pulse is rapid. The most accurate index of the gravity of the patient’s condition is the degree to which arterial pressure is lowered. Severe collapse may be a direct cause of death. Collapse is treated with the immediate use of agents that stimulate the vascular and respiratory centers and with vasoconstrictors, blood transfusions, and blood substitutes. Measures should also be directed toward the elimination of the primary causes of the collapse.

collapse

Mechanical failure of cells in wood, usually caused by abnormal or forced drying.
References in periodicals archive ?
We present a patient with unknown etiology of marked IVC dilation and attenuated IVC collapsibility without elevated RAP.
Airway collapsibility is associated with obesity and hyoid position.
Siriwiwatanakul, "Inferior vena cava diameter and collapsibility index: a practical non-invasive evaluation of intravascular fluid volume in critically-ill patients," Journal of the Medical Association of Thailand, vol.
Since most of our hospitalized patients are semirecumbent with the head of the bed elevated to 30 degrees and IVC maximum diameter and collapsibility index have not been shown to be statistically different between supine and 45 degree semiupright positions [20], we avoid time-consuming repositioning and perform our ultrasound exam in whatever supine or semirecumbent position the patient is at the time of evaluation.
Different studies have validated that maximum diameter of IVC and its collapsibility can give an estimate of CVP and prove to be a useful substitute for more invasive investigations2.
It is hypothesized that these devices may also affect upper airway muscle tone and thus decrease their collapsibility.6 Movement of the tongue or mandible anteriorly can increase the cross-sectional size of the airway and hence ODs help in increasing the airway size, although the increase in airway size may be the most important factor preventing airway occlusion.15
"Confounding and Collapsibility in Causal Inference." Statistical Science 14 (1): 29-46.
The collapsibility of the cups is what provides the cushioning, and depending on the extent of shock absorption needed, the cups can be square or a different shape; the number of layers also varies with the application.
Factors that influence UA collapsibility and therefore susceptibility to OSA may differ between men and women.