Hypoxia ( medical ) - wikipedia Hypoxia ( medical ) Hypoxia Synonyms Hypoxiation Cyanosis of the hand in an elderly person with low oxygen saturation Classification and external resources Specialty Pulmonology, toxicology ICD - 10 J96 ICD - 9 - CM 799.02 DiseasesDB 6623 MeSH D000860 ( edit on Wikidata ) Hypoxia is a condition in which the body or a region of the body is deprived of adequate oxygen supply at the tissue level. Hypoxia may be classified as either generalized, affecting the whole body, or local, affecting a region of the body. Although hypoxia is often a pathological condition, variations in arterial oxygen concentrations can be part of the normal physiology, for example, during hypoventilation training or strenuous physical exercise. Hypoxia differs from hypoxemia and anoxemia in that hypoxia refers to a state in which oxygen supply is insufficient, whereas hypoxemia and anoxemia refer specifically to states that have low or zero arterial oxygen supply. Hypoxia in which there is complete deprivation of oxygen supply is referred to as anoxia. Generalized hypoxia occurs in healthy people when they ascend to high altitude, where it causes altitude sickness leading to potentially fatal complications : high altitude pulmonary edema ( HAPE ) and high altitude cerebral edema ( HACE ). Hypoxia also occurs in healthy individuals when breathing mixtures of gases with a low oxygen content, e.g. while diving underwater especially when using closed - circuit rebreather systems that control the amount of oxygen in the supplied air. A mild and non-damaging intermittent hypoxia is used intentionally during altitude trainings to develop an athletic performance adaptation at both the systemic and cellular level. Hypoxia is also a serious consequence of preterm birth in the neonate. The main cause for this is that the lungs of the human fetus are among the last organs to develop during pregnancy. To assist the lungs to distribute oxygenated blood throughout the body, infants at risk of hypoxia are often placed inside an incubator capable of providing continuous positive airway pressure ( also known as a humidicrib ). Contents 1 Signs and symptoms 1.1 Generalized hypoxia 1.2 Local hypoxia 2 Cause 2.1 Ischemia 2.2 Hypoxemic hypoxia 2.2. 1 Carbon monoxide poisoning 2.2. 2 Altitude 2.2. 3 Hypoxic breathing gases 2.2. 4 Other 2.3 Anemia 2.4 Histotoxic hypoxia 2.4. 1 Cyanide poisoning 3 Physiological compensation 3.1 Acute 3.2 Chronic 4 Treatment 5 See also 6 References Signs and symptoms Generalized hypoxia The symptoms of generalized hypoxia depend on its severity and acceleration of onset. In the case of altitude sickness, where hypoxia develops gradually, the symptoms include fatigue, numbness / tingling of extremities, nausea, and anoxia. In severe hypoxia, or hypoxia of very rapid onset, ataxia, confusion / disorientation / hallucinations / behavioral change, severe headaches / reduced level of consciousness, papilloedema, breathlessness, pallor, tachycardia, and pulmonary hypertension eventually leading to the late signs cyanosis, slow heart rate / cor pulmonale, and low blood pressure followed by death. Because hemoglobin is a darker red when it is not bound to oxygen ( deoxyhemoglobin ), as opposed to the rich red color that it has when bound to oxygen ( oxyhemoglobin ), when seen through the skin it has an increased tendency to reflect blue light back to the eye. In cases where the oxygen is displaced by another molecule, such as carbon monoxide, the skin may appear ' cherry red ' instead of cyanotic. Hypoxia can cause premature birth, and injure the liver, among other deleterious effects. Local hypoxia If tissue is not being perfused properly, it may feel cold and appear pale ; if severe, hypoxia can result in cyanosis, a blue discoloration of the skin. If hypoxia is very severe, a tissue may eventually become gangrenous. Extreme pain may also be felt at or around the site. Cause Oxygen passively diffuses in the lung alveoli according to a pressure gradient. Oxygen diffuses from the breathed air, mixed with water vapour, to arterial blood, where its partial pressure is around 100 mmHg ( 13.3 kPa ). In the blood, oxygen is bound to hemoglobin, a protein in red blood cells. The binding capacity of hemoglobin is influenced by the partial pressure of oxygen in the environment, as described in the oxygen -- hemoglobin dissociation curve. A smaller amount of oxygen is transported in solution in the blood. In peripheral tissues, oxygen again diffuses down a pressure gradient into cells and their mitochondria, where it is used to produce energy in conjunction with the breakdown of glucose, fats, and some amino acids. Hypoxia can result from a failure at any stage in the delivery of oxygen to cells. This can include decreased partial pressures of oxygen, problems with diffusion of oxygen in the lungs, insufficient available hemoglobin, problems with blood flow to the end tissue, and problems with breathing rhythm. Experimentally, oxygen diffusion becomes rate limiting ( and lethal ) when arterial oxygen partial pressure falls to 60 mmHg ( 5.3 kPa ) or below. Almost all the oxygen in the blood is bound to hemoglobin, so interfering with this carrier molecule limits oxygen delivery to the periphery. Hemoglobin increases the oxygen - carrying capacity of blood by about 40-fold, with the ability of hemoglobin to carry oxygen influenced by the partial pressure of oxygen in the environment, a relationship described in the oxygen -- hemoglobin dissociation curve. When the ability of hemoglobin to carry oxygen is interfered with, a hypoxic state can result. Ischemia Main article : Ischemia Ischemia, meaning insufficient blood flow to a tissue, can also result in hypoxia. This is called ' ischemic hypoxia '. This can include an embolic event, a heart attack that decreases overall blood flow, or trauma to a tissue that results in damage. An example of insufficient blood flow causing local hypoxia is gangrene that occurs in diabetes. Diseases such as peripheral vascular disease can also result in local hypoxia. For this reason, symptoms are worse when a limb is used. Pain may also be felt as a result of increased hydrogen ions leading to a decrease in blood pH ( acidity ) created as a result of anaerobic metabolism. Hypoxemic hypoxia Main article : Hypoxemia This refers specifically to hypoxic states where the arterial content of oxygen is insufficient. This can be caused by alterations in respiratory drive, such as in respiratory alkalosis, physiological or pathological shunting of blood, diseases interfering in lung function resulting in a ventilation - perfusion mismatch, such as a pulmonary embolus, or alterations in the partial pressure of oxygen in the environment or lung alveoli, such as may occur at altitude or when diving. Carbon monoxide poisoning Main article : Carbon monoxide poisoning Carbon monoxide competes with oxygen for binding sites on hemoglobin molecules. As carbon monoxide binds with hemoglobin hundreds of times tighter than oxygen, it can prevent the carriage of oxygen. Carbon monoxide poisoning can occur acutely, as with smoke intoxication, or over a period of time, as with cigarette smoking. Due to physiological processes, carbon monoxide is maintained at a resting level of 4 -- 6 ppm. This is increased in urban areas ( 7 -- 13 ppm ) and in smokers ( 20 -- 40 ppm ). A carbon monoxide level of 40 ppm is equivalent to a reduction in hemoglobin levels of 10 g / L. CO has a second toxic effect, namely removing the allosteric shift of the oxygen dissociation curve and shifting the foot of the curve to the left. In so doing, the hemoglobin is less likely to release its oxygens at the peripheral tissues. Certain abnormal hemoglobin variants also have higher than normal affinity for oxygen, and so are also poor at delivering oxygen to the periphery. Altitude Main article : Altitude sickness Hypoxic breathing gases Main articles : Inert gas asphyxiation and Asphyxiant gases The breathing gas in scuba diving may contain an insufficient partial pressure of oxygen, particularly in malfunction of rebreathers. Such situations may lead to unconsciousness without symptoms since carbon dioxide levels are normal and the human body senses pure hypoxia poorly. A similar problem exists when inhaling certain odorless asphyxiant gases. These produce a hypoxic breathing gas which can produce unconsciousness and death without symptoms. This may cause inert gas asphyxiation. Such asphyxia may be deliberate with use of a suicide bag. Accidental death has occurred in cases where concentrations of nitrogen in controlled atmospheres, or methane in mines, has not been detected or appreciated. Other Hemoglobin 's function can also be lost by chemically oxidizing its iron atom to its ferric form. This form of inactive hemoglobin is called methemoglobin and can be made by ingesting sodium nitrite as well as certain drugs and other chemicals. Anemia Main article : Anemia Hemoglobin plays a substantial role in carrying oxygen throughout the body, and when it is deficient, anemia can result, causing ' anaemic hypoxia ' if tissue perfusion is decreased. Iron deficiency is the most common cause of anemia. As iron is used in the synthesis of hemoglobin, less hemoglobin will be synthesised when there is less iron, due to insufficient intake, or poor absorption. Anemia is typically a chronic process that is compensated over time by increased levels of red blood cells via upregulated erythropoetin. A chronic hypoxic state can result from a poorly compensated anaemia. Histotoxic hypoxia Cyanide poisoning Histotoxic hypoxia results when the quantity of oxygen reaching the cells is normal, but the cells are unable to use the oxygen effectively, due to disabled oxidative phosphorylation enzymes. This may occur in Cyanide poisoning. Physiological compensation Acute If oxygen delivery to cells is insufficient for the demand ( hypoxia ), electrons will be shifted to pyruvic acid in the process of lactic acid fermentation. This temporary measure ( anaerobic metabolism ) allows small amounts of energy to be released. Lactic acid build up ( in tissues and blood ) is a sign of inadequate mitochondrial oxygenation, which may be due to hypoxemia, poor blood flow ( e.g., shock ) or a combination of both. If severe or prolonged it could lead to cell death. In humans, hypoxia is detected by the peripheral chemoreceptors in the carotid body and aortic body, with the carotid body chemoreceptors being the major mediators of reflex responses to hypoxia. This response does not control ventilation rate at normal pO 2, but below normal the activity of neurons innervating these receptors increases dramatically, so much so to override the signals from central chemoreceptors in the hypothalamus, increasing pO 2 despite a falling pCO It is seen in a few humans ( encountered with hypoxia ), there is word loss in their speech due to their state of confusion and cell damage in the brain. In most tissues of the body, the response to hypoxia is vasodilation. By widening the blood vessels, the tissue allows greater perfusion. By contrast, in the lungs, the response to hypoxia is vasoconstriction. This is known as `` Hypoxic pulmonary vasoconstriction '', or `` HPV ''. Chronic When the pulmonary capillary pressure remains elevated chronically ( for at least 2 weeks ), the lungs become even more resistant to pulmonary edema because the lymph vessels expand greatly, increasing their capability of carrying fluid away from the interstitial spaces perhaps as much as 10-fold. Therefore, in patients with chronic mitral stenosis, pulmonary capillary pressures of 40 to 45 mm Hg have been measured without the development of lethal pulmonary edema. ( Guytun and Hall physiology ) Hypoxia exists when there is a reduced amount of oxygen in the tissues of the body. Hypoxemia refers to a reduction in PO2 below the normal range, regardless of whether gas exchange is impaired in the lung, CaO2 is adequate, or tissue hypoxia exists. There are several potential physiologic mechanisms for hypoxemia, but in patients with COPD the predominant one is V / Q mismatching, with or without alveolar hypoventilation, as indicated by PaCO2. Hypoxemia caused by V / Q mismatching as seen in COPD is relatively easy to correct, so that only comparatively small amounts of supplemental oxygen ( less than 3 L / min for the majority of patients ) are required for LTOT. Although hypoxemia normally stimulates ventilation and produces dyspnea, these phenomena and the other symptoms and signs of hypoxia are sufficiently variable in patients with COPD as to be of limited value in patient assessment. Chronic alveolar hypoxia is the main factor leading to development of cor pulmonale -- right ventricular hypertrophy with or without overt right ventricular failure -- in patients with COPD. Pulmonary hypertension adversely affects survival in COPD, to an extent that parallels the degree to which resting mean pulmonary artery pressure is elevated. Although the severity of airflow obstruction as measured by FEV1 is the best correlate with overall prognosis in patients with COPD, chronic hypoxemia increases mortality and morbidity for any severity of disease. Large - scale studies of LTOT in patients with COPD have demonstrated a dose - response relationship between daily hours of oxygen use and survival. There is reason to believe that continuous, 24 - hours - per - day oxygen use in appropriately selected patients would produce a survival benefit even greater than that shown in the NOTT and MRC studies. Treatment To counter the effects of high - altitude diseases, the body must return arterial pO 2 toward normal. Acclimatization, the means by which the body adapts to higher altitudes, only partially restores pO 2 to standard levels. Hyperventilation, the body 's most common response to high - altitude conditions, increases alveolar pO 2 by raising the depth and rate of breathing. However, while pO 2 does improve with hyperventilation, it does not return to normal. Studies of miners and astronomers working at 3000 meters and above show improved alveolar pO 2 with full acclimatization, yet the pO 2 level remains equal to or even below the threshold for continuous oxygen therapy for patients with chronic obstructive pulmonary disease ( COPD ). In addition, there are complications involved with acclimatization. Polycythemia, in which the body increases the number of red blood cells in circulation, thickens the blood, raising the danger that the heart ca n't pump it. In high - altitude conditions, only oxygen enrichment can counteract the effects of hypoxia. By increasing the concentration of oxygen in the air, the effects of lower barometric pressure are countered and the level of arterial pO 2 is restored toward normal capacity. A small amount of supplemental oxygen reduces the equivalent altitude in climate - controlled rooms. At 4000 m, raising the oxygen concentration level by 5 percent via an oxygen concentrator and an existing ventilation system provides an altitude equivalent of 3000 m, which is much more tolerable for the increasing number of low - landers who work in high altitude. In a study of astronomers working in Chile at 5050 m, oxygen concentrators increased the level of oxygen concentration by almost 30 percent ( that is, from 21 percent to 27 percent ). This resulted in increased worker productivity, less fatigue, and improved sleep. Oxygen concentrators are uniquely suited for this purpose. They require little maintenance and electricity, provide a constant source of oxygen, and eliminate the expensive, and often dangerous, task of transporting oxygen cylinders to remote areas. Offices and housing already have climate - controlled rooms, in which temperature and humidity are kept at a constant level. Oxygen can be added to this system easily and relatively cheaply. A prescription renewal for home oxygen following hospitalization requires an assessment of the patient for ongoing hypoxemia. See also Asphyxia Autoerotic hypoxia or erotic asphyxiation, intentional restriction of oxygen to the brain for sexual arousal Cerebral hypoxia or cerebral anoxia, a reduced supply of oxygen to the brain Fink effect, or diffusion hypoxia, a factor that influences the partial pressure of oxygen within the pulmonary alveolus G - LOC cerebral hypoxia induced by excessive g - forces Histotoxic hypoxia, the inability of cells to take up or utilize oxygen from the bloodstream Hyperoxia Hypoventilation training Hypoxic drive, a respiratory drive in which the body uses oxygen chemoreceptors to regulate the respiratory cycle Hypoxemia or hypoxemic hypoxia, a deficiency of oxygen in arterial blood Hypoxic hypoxia, a result of insufficient oxygen available to the lungs Hypoxia in fish, responses of fish to hypoxia Hypoxic ventilatory response Hypoxicator a device intended for hypoxia acclimatisation in a controlled manner Intrauterine hypoxia, when a fetus is deprived of an adequate supply of oxygen Intermittent hypoxic training Latent hypoxia or deep water blackout, loss of consciousness on ascending from a deep freedive Pseudohypoxia, increased cytosolic ratio of free NADH to NAD in cells Sleep apnea Time of useful consciousness Tumor hypoxia, the situation where tumor cells have been deprived of oxygen Rhinomanometry References Jump up ^ Woorons, Xavier, Hypoventilation training, push your limits ! Arpeh, 2014, 164p. ( ISBN 978 - 2 - 9546040 - 1 - 5 ) Jump up ^ West, John B. ( 1977 ). Pulmonary Pathophysiology : The Essentials. Williams & Wilkins. p. 22. ISBN 0 - 683 - 08936 - 6. Jump up ^ Cymerman, A ; Rock, PB. `` Medical Problems in High Mountain Environments. A Handbook for Medical Officers ''. USARIEM - TN94 - 2. US Army Research Inst. of Environmental Medicine Thermal and Mountain Medicine Division Technical Report. Retrieved 2009 - 03 - 05. Jump up ^ Gore CJ, Clark SA, Saunders PU ( September 2007 ). `` Nonhematological mechanisms of improved sea - level performance after hypoxic exposure ''. Med Sci Sports Exerc. 39 ( 9 ) : 1600 -- 9. doi : 10.1249 / mss. 0b013e3180de49d3. PMID 17805094. ^ Jump up to : Robinson, Grace ; Strading, John ; West, Sophie ( 2009 ). Oxford Handbook of Respiratory Medicine. Oxford University Press. p. 880. ISBN 0199545162. Jump up ^ Bergqvist, Pia ( 15 April 2015 ). `` Preventing Hypoxia : What To Do Now ''. Flying. Retrieved 22 April 2015. 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Retrieved 2006 - 08 - 10. -- Online interactive oxygen delivery calculator. Jump up ^ Jae - Hwan, Lee ; Eun - Kyeong, Shin ; Dongoh, Lee ; Eui - Bae, Jeung ( April 2015 ). `` SAT - 532 : Expression of Beta - Oxidation Related Genes Under Hypoxic Condition Induced Preeclamptic Model in Vitro and in Vivo ''. Endocrine Reviews. 36 ( 2 ). doi : 10.1210 / endo - meetings. 2015. CE. 4. SAT - 532 ( inactive 2017 - 02 - 16 ). Retrieved 11 November 2016. ^ Jump up to : Martin, Lawrence ( 1999 ). All you really need to know to interpret arterial blood gases ( 2nd ed. ). Philadelphia : Lippincott Williams & Wilkins. ISBN 0 - 683 - 30604 - 9. ^ Jump up to : Nicki R. Colledge ; Brian R. Walker ; Stuart H. Ralston, eds. ( 2010 ). Davidson 's principles and practice of medicine. illustrated by Robert Britton ( 21st ed. ). Edinburgh : Churchill Livingstone / Elsevier. ISBN 978 - 0 - 7020 - 3085 - 7. Jump up ^ West, John B. ( 2008 ). Respiratory Physiology : The Essentials ( 8th ed. ). La Jolla : Wolters Kluwer Lippincott Williams & Wilkins. pp. 88 -- 89. Jump up ^ Douglas CG, Haldane JS, Haldane JB ( Jun 12, 1912 ). `` The laws of combination of hemoglobin with carbon monoxide and oxygen ''. The Journal of Physiology. 44 ( 4 ) : 275 -- 304. doi : 10.1113 / jphysiol. 1912. sp001517. PMC 1512793. PMID 16993128. ^ Jump up to : Wald, NJ ; Idle, M ; Boreham, J ; Bailey, A ( May 1981 ). `` Carbon monoxide in breath in relation to smoking and carboxyhaemoglobin levels ''. Thorax. 36 ( 5 ) : 366 -- 9. doi : 10.1136 / thx. 36.5. 366. PMC 471511. PMID 7314006. Jump up ^ The formula H b C O ( % ) = C O − 2.34 5.09 ( displaystyle Hb_ ( CO ) ( % ) = ( \frac ( CO-2.34 ) ( 5.09 ) ) ) can be used to calculate the amount of carbon monoxide - bound hemoglobin. For example, at carbon monoxide level of 5 ppm, = 5 − 2.34 5.09 =. 5 % ( displaystyle = ( \frac ( 5 - 2.34 ) ( 5.09 ) ) =. 5 % ), or a loss of half a percent of their blood 's hemoglobin. ( Wald et al., 1981 ) Jump up ^ Martin, Lawrence. ( 1992 ) All you really need to know to interpret arterial blood gases. 2nd edition ISBN 0 - 683 - 30604 - 9 Jump up ^ Roueché, Berton ( 1953 ) Eleven blue men, and other narratives of medical detection. Boston : Little, Brown. Jump up ^ Seneff, Stephanie ; Swanson, Nancy ; Li, Chen ( 2015 ) Aluminum and Glyphosate Can Synergistically Induce Pineal Gland Pathology : Connection to Gut Dysbiosis and Neurological Disease. Agricultural Sciences, 2015, 6, 42 -- 70. https://dx.doi.org/10.4236/as.2015.61005 Jump up ^ Pittman, RN ( 2011 ). `` Regulation of Tissue Oxygenation ''. Morgan & Claypool Life Sciences. p. Chapter 7. Jump up ^ Hobler, K.E. ; L.C. Carey ( 1973 ). `` Effect of acute progressive hypoxemia on cardiac output and plasma excess lactate ''. Ann Surg. 177 ( 2 ) : 199 -- 202. doi : 10.1097 / 00000658 - 197302000 - 00013. PMC 1355564. PMID 4572785. Jump up ^ Arieff, Allen I. ( 2013 ). Hypoxia, Metabolic Acidosis, and the Circulation. Springer. pp. 4 -- 5. ISBN 978 - 1461475422. Jump up ^ Michiels, Carine ( 2004 ). `` Physiological and Pathological Responses to Hypoxia ''. The American Journal of Pathology. 164 ( 6 ) : 1875 -- 1882. doi : 10.1016 / S0002 - 9440 ( 10 ) 63747 - 9. PMC 1615763. PMID 15161623. Jump up ^ Pierson, D.J. ( 2000 ). `` Pathophysiology and clinical effects of chronic hypoxia ''. Respir Care. 45 ( 1 ) : 39 -- 51 ; discussion 51 -- 3. PMID 10771781. ^ Jump up to : West, John B. ; American College Of Physicians ; American Physiological Society ( 2004 ). `` The Physiologic Basis of High - Altitude Diseases ''. Annals of Internal Medicine. 141 ( 10 ) : 789 -- 800. doi : 10.7326 / 0003 - 4819 - 141 - 10 - 200411160 - 00010. PMID 15545679. Jump up ^ West, John B. ( 1995 ). `` Oxygen Enrichment of Room Air to Relieve the Hypoxia of High Altitude ''. Respiration Physiology. 99 ( 2 ) : 225 -- 32. doi : 10.1016 / 0034 - 5687 ( 94 ) 00094 - G. PMID 7777705. Jump up ^ American College of Chest Physicians ; American Thoracic Society ( September 2013 ), `` Five Things Physicians and Patients Should Question '', Choosing Wisely : an initiative of the ABIM Foundation, American College of Chest Physicians and American Thoracic Society, retrieved 6 January 2013 Respiratory physiology Respiration breath inhalation exhalation respiratory rate respirometer pulmonary surfactant compliance elastic recoil hysteresivity airway resistance bronchial hyperresponsiveness constriction dilatation mechanical ventilation Control pons pneumotaxic center apneustic center medulla dorsal respiratory group ventral respiratory group chemoreceptors central peripheral pulmonary stretch receptors Hering -- Breuer reflex Lung volumes VC FRC Vt dead space CC PEF calculations respiratory minute volume FEV1 / FVC ratio Lung function tests spirometry body plethysmography peak flow meter nitrogen washout Circulation pulmonary circulation hypoxic pulmonary vasoconstriction pulmonary shunt Interactions ventilation ( V ) Perfusion ( Q ) Ventilation / perfusion ratio V / Q scan zones of the lung gas exchange pulmonary gas pressures alveolar gas equation alveolar -- arterial gradient hemoglobin oxygen -- haemoglobin dissociation curve ( Oxygen saturation 2, 3 - BPG Bohr effect Haldane effect ) carbonic anhydrase ( chloride shift ) oxyhemoglobin respiratory quotient arterial blood gas diffusion capacity ( DLCO ) Insufficiency high altitude oxygen toxicity hypoxia Consequences of external causes ( T66 -- T78, 990 -- 995 ) Temperature Elevated Hyperthermia Heat syncope Reduced Hypothermia Immersion foot syndromes Trench foot Tropical immersion foot Warm water immersion foot Chilblains Frostbite Aerosol burn Cold intolerance Acrocyanosis Erythrocyanosis crurum Radiation Radiation poisoning Radiation burn Chronic radiation keratosis Eosinophilic, polymorphic, and pruritic eruption associated with radiotherapy Radiation acne Radiation - induced cancer Radiation recall reaction Radiation - induced erythema multiforme Radiation - induced hypertrophic scar Radiation - induced keloid Radiation - induced morphea Air Hypoxia / Asphyxia Barotrauma Aerosinusitis Decompression sickness High altitude Altitude sickness Chronic mountain sickness HAPE HACE Food Starvation Maltreatment Physical abuse Sexual abuse Psychological abuse Travel Motion sickness Seasickness Airsickness Space adaptation syndrome Adverse effect Hypersensitivity Anaphylaxis Angioedema Allergy Arthus reaction Adverse drug reaction Other Electric shock Drowning Lightning injuries Ungrouped skin conditions resulting from physical factors Dermatosis neglecta Pinch mark Pseudoverrucous papules and nodules Sclerosing lymphangitis Tropical anhidrotic asthenia UV - 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Question: medical term for deficiency of oxygen in the blood
Answer: anaemic hypoxia