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Encyclopedia > Acidosis
Acidosis
Classification & external resources
ICD-10 E87.2
ICD-9 276.2
DiseasesDB 87
MeSH D000138
For acidosis referring to acidity of the urine, see renal tubular acidosis.

Acidosis is an increased acidity (i.e. an increased hydrogen ion concentration). If not further qualified, it refers to acidity of the blood plasma. The International Statistical Classification of Diseases and Related Health Problems (most commonly known by the abbreviation ICD) provides codes to classify diseases and a wide variety of signs, symptoms, abnormal findings, complaints, social circumstances and external causes of injury or disease. ... The International Statistical Classification of Diseases and Related Health Problems 10th Revision (ICD-10) is a coding of diseases and signs, symptoms, abnormal findings, complaints, social circumstances and external causes of injury or diseases, as classified by the World Health Organization (WHO). ... // E00-E35 - Endocrine diseases (E00-E07) Disorders of thyroid gland (E00) Congenital iodine-deficiency syndrome (E01) Iodine-deficiency-related thyroid disorders and allied conditions (E02) Subclinical iodine-deficiency hypothyroidism (E03) Other hypothyroidism (E030) Congenital hypothyroidism with diffuse goitre (E031) Congenital hypothyroidism without goitre (E032) Hypothyroidism due to medicaments and other... The International Statistical Classification of Diseases and Related Health Problems (most commonly known by the abbreviation ICD) provides codes to classify diseases and a wide variety of signs, symptoms, abnormal findings, complaints, social circumstances and external causes of injury or disease. ... The following is a list of codes for International Statistical Classification of Diseases and Related Health Problems. ... The Disease Bold textDatabase is a free website that provides information about the relationships between medical conditions, symptoms, and medications. ... Medical Subject Headings (MeSH) is a huge controlled vocabulary (or metadata system) for the purpose of indexing journal articles and books in the life sciences. ... Renal tubular acidosis, or RTA, is a medical condition in which the kidneys fail to dispose of a normal amount of acid into the urine, which may lead to acidosis (where the blood becomes too acidic). ... Acidity is a controversial novelette written for the popular South Asian website Chowk. ... Hydronium is the common name for the cation H3O+. Nomenclature According to IUPAC ion nomenclature, it should be referred to as oxonium. ... For other uses, see Concentration (disambiguation). ... Blood plasma is the liquid component of blood, in which the blood cells are suspended. ...


Acidosis is said to occur when arterial pH falls below 7.35, while its counterpart (alkalosis) occurs at a pH over 7.45. Arterial blood gas analysis and other tests are required to separate the main causes. For other uses, see PH (disambiguation). ... Alkalosis refers to a condition reducing hydrogen ion concentration of arterial blood plasma. ... Arterial blood gas measurement is a blood test that is performed to determine the concentration of oxygen, carbon dioxide and bicarbonate, as well as the pH, in the blood. ...


The term acidemia describes the state of low blood pH, while acidosis is used to describe the processes leading to these states. Nevertheless, physicians sometimes use the terms interchangeably. The distinction may be relevant where a patient has factors causing both acidosis and alkalosis, where the relative severity of both determines whether the result is a high or a low pH. Acidosis is an increased acidity (i. ...


The rate of cellular metabolic activity affects and, at the same time, is affected by the pH of the body fluids. In mammals, the normal pH of arterial blood lies between 7.35 and 7.50 depending on the species (e.g. healthy human-arterial blood pH varies between 7.35 and 7.45). Blood pH values compatible with life in mammals are limited to a pH range between 6.8 and 7.8. Changes in the pH of arterial blood (and therefore the extracellular fluid) outside this range result in irreversible cell damage (Needham, 2004).

Contents

Respiratory acidosis

Respiratory acidosis results from a build-up of carbon dioxide in the blood (hypercapnia) due to hypoventilation. It is most often caused by pulmonary problems, although head injuries, drugs (especially anaesthetics and sedatives), and brain tumors can also bring it on. Pneumothorax, emphysema, chronic bronchitis, asthma, severe pneumonia, and aspiration are among the most frequent causes. It can also occur as a compensatory response to chronic metabolic alkalosis. Respiratory acidosis is acidosis (abnormal acidity of the blood) due to decreased ventilation of the pulmonary alveoli, leading to elevated arterial carbon dioxide concentration. ... In medicine, hypoventilation (also known as respiratory depression) occurs when ventilation is inadequate (hypo means below) to perform needed gas exchange. ... Human respiratory system The lungs flank the heart and great vessels in the chest cavity. ... Head injury is a trauma to the head, that may or may not include injury to the brain (see also brain injury). ... Anesthesia (AE), also anaesthesia (BE), is the process of blocking the perception of pain and other sensations. ... A sedative is a substance that depresses the central nervous system (CNS), resulting in calmness, relaxation, reduction of anxiety, sleepiness, and slowed breathing, as well as slurred speech, staggering gait, poor judgment, and slow, uncertain reflexes. ... A brain tumor is any intracranial tumor created by abnormal and uncontrolled cell division, normally either in the brain itself (neurons, glial cells (astrocytes, oligodendrocytes, ependymal cells), lymphatic tissue, blood vessels), in the cranial nerves (myelin-producing Schwann cells), in the brain envelopes (meninges), skull, pituitary and pineal gland, or... “Collapsed lung” redirects here. ... Bronchitis is an inflammation of the bronchi (medium-size airways) in the lungs. ... This article is about human pneumonia. ... Aspiration pneumonia is a specific form of lung infection (pneumonia) that develops when oral or gastric contents (including food, saliva, or nasal secretions) enter the bronchial tree. ... Metabolic alkalosis results from altered metabolism. ...


One key to distinguish between respiratory and metabolic acidosis is that in respiratory acidosis, the CO2 is increased while the bicarbonate is either normal (uncompensated) or increased (compensated). Compensation occurs if respiratory acidosis is present, and a chronic phase is entered with partial buffering of the acidosis through renal bicarbonate retention. For baking soda, see Sodium bicarbonate In inorganic chemistry, a bicarbonate (IUPAC-recommended nomenclature: hydrogencarbonate) is an intermediate form in the deprotonation of carbonic acid. ...


However, in cases where chronic illnesses which compromise pulmonary function persist, such as late-stage emphysema and certain types of muscular dystrophy, compensatory mechanisms will be unable to reverse this acidotic conditon. As metabolic bicarbonate production becomes exhausted, and extraeneous bicarbonate infusion can no longer reverse the extreme buildup of carbon dioxide associated with uncompensated respiratory acidosis, mechanical ventilation will usually be applied.[1][2] Muscular dystrophy refers to a group of genetic, hereditary muscle diseases that cause progressive muscle weakness. ... mechanical or forced ventilation is the use of powered equipment, e. ...


Metabolic acidosis

Metabolic acidosis is an increased production of metabolic acids, usually resulting from disturbances in the ability to excrete acid via the kidneys. Renal acidosis is associated with an accumulation of urea and creatinine as well as metabolic acid residues of protein catabolism. In medicine, metabolic acidosis is a state in which the blood pH is low (under 7. ... The kidneys are organs that filter wastes (such as urea) from the blood and excrete them, along with water, as urine. ...


An increase in the production of other acids may also produce metabolic acidosis. For example, lactic acidosis may occur from 1) severe (PaO2 <36mm Hg) hypoxemia causing a fall in the rate of oxygen diffusion from arterial blood to tissues, or 2) hypoperfusion (e.g. hypovolemic shock) causing an inadequate blood delivery of oxygen to tissues. A rise in lactate out of proportion to the level of pyruvate, e.g. in mixed venous blood, is termed "excess lactate", and may also be an indicator of fermention due to anaerobic metabolism occuring in muscle cells, as seen during strenuous exercise. Once oxygenation is restored, the acidosis clears quickly. Another example of increased production of acids occurs in starvation and diabetic acidosis. It is due to the accumulation of ketoacids (ketosis) and reflects a severe shift from glycolysis to lipolysis for energy needs. Hypoxia is a pathological condition in which the body as a whole (generalised hypoxia) or region of the body (tissue hypoxia) is deprived of adequate oxygen supply. ... In medicine, shock (hypoperfusion) is a life-threatening medical emergency characterized by inability of the body to supply enough oxygen to meet tissue requirements. ... Lipolysis is the breakdown of fat stored in fat cells. ...


Acid consumption from poisoning, elevated levels of iron in the blood, and chronically decreased production of bicarbonate may also produce metabolic acidosis. For other uses, see Poison (disambiguation). ... For other uses, see Iron (disambiguation). ... For baking soda, see Sodium bicarbonate In inorganic chemistry, a bicarbonate (IUPAC-recommended nomenclature: hydrogencarbonate) is an intermediate form in the deprotonation of carbonic acid. ...


Metabolic acidosis is compensated for in the lungs, as increased exhalation of carbon dioxide promptly shifts the buffering equation to reduce metabolic acid. This is a result of stimulation to chemoreceptors which increases alveolar ventilation, leading to respiratory compensation, otherwise known as Kussmaul breathing (a specific type of hyperventilation). Should this situation persist the patient is at risk for exhaustion leading to respiratory failure. A Chemosensor, also known as chemoreceptor, is a cell or group of cells that transduce a chemical signal into an action potential. ... For other uses, see Ventilation. ... Kussmaul breathing is the rapid, deep, and labored breathing of people who have acidosis. ... In medicine, hyperventilation (or hyperpnea) is the state of breathing faster or deeper (hyper) than necessary, and thereby reducing the carbon dioxide concentration of the blood below normal. ... Respiratory failure is a medical term for inadequate gas exchange by the respiratory system. ...


Mutations to the V-ATPase 'a4' or 'B1' isoforms result in distal renal tubular acidosis, a condition that leads to metabolic acidosis, in some cases with sensorineural deafness. V-ATPase schematic Vacuolar type H+-ATPase (V-ATPase) is a highly conserved evolutionarily ancient enzyme with remarkably diverse functions in eukaryotic organisms. ...


Arterial blood gasses will indicate low pH, low blood HCO3, and normal or low PaCO2. In addition to arterial blood gas, an anion gap can also differentiate between possible causes. Arterial blood gas measurement is a blood test that is performed to determine the concentration of oxygen, carbon dioxide and bicarbonate, as well as the pH, in the blood. ... For other uses, see PH (disambiguation). ... Bicarbonate is a polyatomic ion whose formula is HCO3-. It is the intermediate form in the deprotonation of carbonic acid: removing the first proton from carbonic acid forms bicarbonate; removing the second proton leads to the carbonate ion. ... The anion gap is used to aid in the differential diagnosis of metabolic acidosis. ...


The Henderson-Hasselbalch equation is useful for calculating blood pH, because blood is a buffer solution. The amount of metabolic acid accumulating can also be quantitated by using buffer base deviation, a derivative estimate of the metabolic as opposed to the respiratory component. In hypovolemic shock for example, approximately 50% of the metabolic acid accumulation is lactic acid, which disappears as blood flow and oxygen debt are corrected. The Henderson-Hasselbalch (frequently misspelled Henderson-Hasselbach) equation in chemistry describes the derivation of pH as a measure of acidity (using pKa, the acid dissociation constant) in biological and chemical systems. ... Acids and bases: Acid-base reaction theories pH Self-ionization of water Buffer solutions Systematic naming Electrochemistry Acid-base extraction Acids: Strong acids Weak acids Superacids Lewis acids Mineral acids Organic acids Bases: Strong bases Weak bases Superbases Lewis bases Organic bases edit Buffer solutions are solutions which resist change...


Treatment of uncompensated metabolic acidosis is focused upon correcting the underlying problem. When metabolic acidosis is severe and can no longer be compensated for adequately by the lungs, neutralizing the acidosis with infusions of bicarbonate may be required. For baking soda, see Sodium bicarbonate In inorganic chemistry, a bicarbonate (IUPAC-recommended nomenclature: hydrogencarbonate) is an intermediate form in the deprotonation of carbonic acid. ...


References

  • Hobler KE, Carey LC. Effect of acute progressive hypoxemia on cardiac output and plasma excess lactate. Ann Surg. 1973 Feb;177(2):199-202.
  • Hobler KE, Napodano RJ, Tolerance of swine to acute blood volume deficits.
  • J Trauma. 1974 Aug;14(8):716-8.
  • Clinical Physiology of Acid-Base and Electrolyte Disorders by Rose, Post
  • Intensive Care Medicine by Irwin and Rippe
  • The ICU Book by Marino
  • Needham, A. 2004. Comparative and Environmental Physiology Acidosis and Alkalosis.

External links

  • National Kidney and Urologic Diseases Information Clearinghouse
Look up Acidosis in
Wiktionary, the free dictionary.

  Results from FactBites:
 
Lactic acidosis - Wikipedia, the free encyclopedia (174 words)
Lactic acidosis is a condition caused by the buildup of lactic acid in the body.
It leads to acidification of the blood (acidosis), and is considered a distinct form of metabolic acidosis.
Lactic acidosis may be caused by diabetic ketoacidosis or liver or kidney disease, as well as some forms of medication (most notably metformin).
  More results at FactBites »


 

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