dead space(redirected from Skip zone)
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1. a space remaining in the tissues as a result of failure of proper closure of surgical or other wounds, permitting the accumulation of blood or serum.
2. the portions of the respiratory tract that are ventilated but not perfused by pulmonary circulation.
alveolar dead space the difference between anatomical dead space and physiologic dead space, representing the space in alveoli occupied by air that does not participate in oxygen–carbon dioxide exchange (alveolar ventilation). It varies in different parts of the lungs and under different conditions.
anatomical dead space the airways of the mouth, nose, pharynx, larynx, trachea, bronchi, and bronchioles.
equipment dead space the volume of equipment that results in rebreathing of gases.
physiologic dead space the sum of the anatomic and alveolar dead spaces; its volume (VD) is determined by measuring the partial pressure of carbon dioxide in a sample of exhaled gas (PECO2) and in the arterial blood (PaCO2) and (with tidal volume of VT) using the formula VD/VT = (PaCO2−PECO2)/PaCO2.
1. a cavity, potential or real, remaining after the closure of a wound that is not obliterated by the operative technique;
Etymology: AS, dead; L, spatium
1 a cavity that remains after the incomplete closure of a surgical or traumatic wound, leaving an area in which blood can collect and delay healing.
2 the amount of lung in contact with ventilating gases but not in contact with pulmonary blood flow. Alveolar dead space is characterized by alveoli that are ventilated by the pulmonary circulation but are not perfused. The condition may exist when pulmonary circulation is obstructed, as by a thromboembolus. Anatomical dead space is an area in the trachea, bronchi, and air passages containing air that does not reach the alveoli during respiration. As a general rule, the volume of air in the anatomical dead space in milliliters is approximately equal to the weight in pounds of the individual affected. Certain lung disorders, such as emphysema, increase the amount of anatomical dead space. Physiological dead space is an area in the respiratory system that includes the anatomical dead space together with the space in the alveoli occupied by air that does not contribute to the oxygen-carbon dioxide exchange.
Therapeutics That part of a syringe’s tip and needle that contains medication that cannot be administered; dead space is very important in insulin therapy, and for drugs in which the syringe has < 0.5 mL capacity
dead spaceClinical therapeutics That part of a syringe's tip and needle that contains medication that can't be administered; DS is very important in insulin therapy, and for medications where the syringe has < 0.5 mL capacity
dead space(ded spās)
dead spacethe air in trachea, bronchi and bronchioles that does not take part in gaseous exchange. Of each breath of 500 cm3, only about half of the air reaches the alveoli.
dead spacein human anatomy and physiology, refers to the respiratory passages (airways) leading to the alveoli of the lungs, so named because the air breathed in and out of this space does not reach the alveoli and so takes no part in gas exchange with the blood; dead space ventilation the volume of gas breathed in and out of the dead space per minute, normally about one-third of the total ventilation (minute volume) at rest, becoming a smaller fraction as tidal volume increases in exercise.
dead space(ded spās)
A cavity, potential or real, remaining after the closure of a wound that is not obliterated by the operative technique.
1. a delimited area.
2. an actual or potential cavity of the body.
3. the areas of the universe beyond the earth and its atmosphere.
1. space remaining in tissues as a result of failure of proper closure of surgical or other wounds, permitting accumulation of blood or serum.
2. the portions of the respiratory tract (passages and space in the alveoli) occupied by gas not concurrently participating in oxygen-carbon dioxide exchange.
small spaces between liver sinusoids and liver cells; conduits for liver lymph. Called also perisinusoidal space.
the space between the dura mater and the lining of the spinal canal.
s's of Fontana
fluid spaces separating solid trabeculae in the iridial angle meshwork.
the part of the dental arch where there are no teeth.
the space between two adjacent ribs.
the space of the human and some other placentae into which the chorionic villi project and through which the maternal blood circulates.
the intervertebral space between the last lumbar and the first sacral vertebrae; suitable site for epidural injection.
open spaces filled with lymph in connective or other tissue, especially in the brain and meninges.
a recess in the dura mater that lodges the trigeminal ganglion.
the central cavity and the intervals between the trabeculae of bone that contain the marrow.
spaces in the dura mater along the superior sagittal sinus which receive the venous blood.
see Disse spaces (above).
a lymph space within the walls of an artery.
a fascial space on the sole of the foot of primates, divided by septa into the lateral, middle and median plantar spaces.
a portion of bone occupied by air-containing cells, especially the spaces constituting the paranasal sinuses.
the space between the peritoneum and the dorsal abdominal wall.
the space behind the pharynx, containing areolar tissue.
the space between the arachnoid and the pia mater, containing cerebrospinal fluid.
the space between the dura mater and the arachnoid.
the space between the diaphragm and subjacent organs of bipeds.
somewhat triangular space in the body cavity cranial to the umbilicus.
a lymph space between the sclera and Tenon's capsule.