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 ?
The influence of aging on pharyngeal collapsibility during sleep.
38-inch) where having 25% collapsibility would have passed that same restriction with 14.
Increasing end expiratory lung volume decreases airway collapsibility in healthy controls and improves respiratory mechanics in OSA patients (49,52,130-132).
Impaired upper airway integrity by residual neuromuscular blockade: increased airway collapsibility and blunted genioglossus muscle activity in response to negative pharyngeal pressure.
Increased upper airway resistance and collapsibility in patients with OSA can be the result of an anatomic compromise.
The mechanism of OSA has been related to increased UA collapsibility and reduction of UA size, alterations in craniofacial structure and enlargement of surrounding soft tissue structures (i.
Prone position increases collapsibility of the passive pharynx in infants and small children.
com to view the article, "Comparing Refractory Coatings On Shell Sand Utilizing Elevated Temperature and Collapsibility Testing," by S.
Or the Stackable Luggage to make traveling easier with its exceptional rolling balance, stackability and collapsibility.
Superior vena caval collapsibility as a gauge of volume status in ventilated septic patients.
Numerous experts have subsequently attempted to modify the initial procedure, with proposed changes aimed at enlarging the pharynx and reducing the redundancy and collapsibility of hypopharyngeal tissues.