cerebral hypoxia(redirected from Brain anoxia)
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cerebral hypoxia↓ O2 in brain; depending on the duration and severity, Sx range from mild–eg, lethargy to serious neurologic damage–eg, coma, seizures, death
Lack of oxygen supply to the brain, usually as a result of either diminished blood flow (such as in traumatic childbirth or cardiopulmonary arrest) or diminished oxygenation of the blood (such as in high-altitude exposures or patients with advanced cardiopulmonary disease). If nothing is done to treat this condition, irreversible anoxic damage to the brain begins after 4 to 6 min and sooner in some cases. If basic resuscitation measures are begun before the end of this period, the onset of cerebral death may be postponed.See: cardiopulmonary resuscitation
See also: hypoxia
a broad term meaning diminished availability of oxygen to the body tissues.
Its causes are many and varied. There may be a deficiency of oxygen in the atmosphere, as in altitude sickness, or a pulmonary disorder that interferes with adequate ventilation of the lungs. Anemia or circulatory deficiencies can lead to inadequate transport and delivery of oxygen to the tissues. Finally, edema or other abnormal conditions of the tissues themselves may impair the exchange of oxygen and carbon dioxide between the capillaries and the tissues. The effect of hypoxia is to reduce the functional activity of tissues. The initial response may be one of temporarily increased activity. Terminally the tissue may be irreparably damaged.
due to inadequate supply of hemoglobin in the blood.
may be acute or chronic causing either a tremor-convulsion syndrome or one of longer term weakness, ataxia, apparent blindness and lethargy.
occurs as a result of deprivation of the fetus of oxygen during parturition, because it is delayed or the umbilical cord pinched off. Clinically there is weakness, imbecility, disinclination to suck, possibly hypothermia. Foals experience a much more violent, convulsive or dummy syndrome. See also neonatal maladjustment syndrome. Called also intrapartum hypoxia.
see fetal hypoxia (above).
insufficient oxygen in tissues because of an inadequate blood supply.
inadequate supply of oxygen to tissues because of slow rate of passage of the blood through the tissues.