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| {{DiseaseDisorder infobox | | | __NOTOC__ |
| Name = Hypocalcemia |
| | {{Hypocalcemia}} |
| ICD10 = {{ICD10|E|83|5|e|70}} |
| | {{CMG}}; {{AE}} {{VKG}}{{Vbe}} |
| ICD9 = {{ICD9|275.41}} |
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| ICDO = |
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| Image = Ca-TableImage.png |
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| Caption = [[Calcium]] |
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| OMIM = |
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| OMIM_mult = |
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| MedlinePlus = |
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| eMedicineSubj = emerg |
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| eMedicineTopic = 271 |
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| DiseasesDB = 6412 |
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| MeshID = D006996 |
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| }} | |
| {{SI}} | |
| {{CMG}} | |
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| {{Editor Help}} | | {{SK}} hypocalcemia; low serum calcium level; hypocalcaemia |
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| ==Overview== | | {| class="infobox" style="float: right;" |
| | | style="vertical-align: middle; padding: 5px;" align=center | [[File:Siren.gif|30px|link=Hypocalcemia resident survival guide]] |
| | | style="vertical-align: middle; padding: 5px;" align=center | [[Hypocalcemia resident survival guide|'''Resident'''<br>'''Survival'''<br>'''Guide''']] |
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| '''Hypocalcemia''' is the presence of low [[blood plasma|serum]] [[calcium]] levels in the [[blood]], usually taken as less than 3.5 mmol/L or 8.8 mg/dl or an [[ion]]ized calcium level of less than 1.1 mmol/L (4.5 mg/dL). It is a type of [[electrolyte disturbance]]. In the blood, about half of all calcium is bound to proteins such as [[serum albumin]], but it is the unbound, or ''ionized'', calcium that the body regulates. If a person has abnormal levels of blood proteins then the plasma calcium may be inaccurate. The ionized calcium level is considered more clinically accurate in this case.
| | ==[[Hypocalcemia overview|Overview]]== |
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| [[Calcium]] is the most abundant mineral in the body. 99% of the body's calcium is stored in bone. Calcium is found in plasma and is either protein-bound or ionized and readily available. | | ==[[Hypocalcemia historical perspective|Historical Perspective]]== |
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| ==Alkalosis== | | ==[[Hypocalcemia classification|Classification]]== |
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| As [[blood plasma]] hydrogen ion concentration decreases, caused by respiratory or metabolic [[alkalosis]], freely ionized calcium concentration decreases. This freely ionized calcium is the biologically active component of blood calcium. Since a portion of both hydrogen ions and calcium are bound to serum [[albumin]], when blood becomes alkalotic, bound hydrogen ions dissociate from albumin, freeing up the albumin to bind with more calcium and thereby decreasing the freely ionized portion of total serum calcium. For every 0.1 increase in pH, ionized calcium decreases by about 0.05 mmol/l.
| | ==[[Hypocalcemia pathophysiology|Pathophysiology]]== |
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| This hypocalcemia related to alkalosis is partially responsible for the cerebral [[vasoconstriction]] that causes the [[lightheadedness]], [[fainting]], and [[parasthesia]] often seen with [[hyperventilation]].
| | ==[[Hypocalcemia causes|Causes]]== |
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| ==Differential Diagnosis Based Upon Pathophysiology== | | ==[[Hypocalcemia differential diagnosis|Differentiating Hypocalcemia from other Diseases]]== |
| * [[Eating disorders]]
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| * [[Magnesium]] over supplementation
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| * Prolonged use of medications/laxatives containing [[magnesium]]
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| * Absent [[parathyroid hormone]] (PTH)
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| ** Hereditary [[hypoparathyroidism]]
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| ** Acquired [[hypoparathyroidism]]
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| ** [[Hypomagnesemia]]
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| ** Following [[parathyroidectomy]], "Hungry Bone Syndrome"
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| ** Following [[thyroidectomy]], the [[parathyroid glands]] are located very close to the [[thyroid]] and are easily injured or even accidentally removed during thyroidectomy
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| * Ineffective [[PTH]]
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| ** [[Chronic renal failure]]
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| ** Absent active [[vitamin D]]
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| *** Decreased dietary intake
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| *** Decreased sun exposure
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| *** Defective [[Vitamin D]] metabolism
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| **** [[Anticonvulsant]] therapy
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| **** Vitamin-D dependent [[rickets]], type I
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| ** Ineffective active [[vitamin D]]
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| *** Intestinal [[malabsorption]]
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| *** Vitamin-D dependent rickets, type II
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| ** [[Pseudohypoparathyroidism]]
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| * Deficient [[PTH]]
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| ** Severe acute [[hyperphosphatemia]]
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| *** [[Tumor lysis syndrome]]
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| *** [[Acute renal failure]]
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| *** [[Rhabdomyolysis]] (initial stage)
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| ** [[Osteitis fibrosa]] following [[parathyroidectomy]]
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| * Exposure to [[hydrofluoric acid]]
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| * As a complication of [[pancreatitis]]
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| * As a result of [[hyperventilation]].
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| * [[Chelation]] Therapy
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| == Complete Differential Diagnosis of Hypocalcemia== | | ==[[Hypocalcemia epidemiology and demographics|Epidemiology and Demographics]]== |
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| In alphabetical order. <ref>Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:77 ISBN 1591032016</ref> <ref>Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:68 ISBN 140510368X</ref>
| | ==[[Hypocalcemia risk factors|Risk Factors]]== |
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| * [[Acute pancreatitis]]
| | ==[[Hypocalcemia screening|Screening]]== |
| * [[Adrenocortical hyperplasia]]
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| * [[Alcohol abuse]]
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| * [[Alkalosis]]
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| * Anticonvulsants
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| * [[Breast cancer]]
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| * [[Bronchial cancer]]
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| * [[Burns]]
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| * [[Chronic Renal Failure]]
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| * [[Cirrhosis]]
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| * Decreased ultraviolet/sun ([[vitamin D deficiency]])
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| * [[DiGeorge's Syndrome]]
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| * [[Diuretic]] therapy
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| * [[Drugs]]
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| * Enemas, laxatives
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| * Enhanced bone formation
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| * Excessive secretion of [[calcitonin]]
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| * [[Familial hypocalcemia]]
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| * [[Hyperphosphatemia]]
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| * [[Hypoalbuminemia]] (pseudohypocalcemia)
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| * Hypomagnesiumia
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| * [[Hypoparathyroidism]]
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| * [[Hypoproteinemia]]
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| * Increased diuresis with physiologic saline solution
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| * Intravenous phosphate administration
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| * Kidney diseases with reduced formation of activated [[vitamin D]]
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| * [[Magnesium]] depletion
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| * Malabsorption
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| * Maldigestion
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| * [[Medullary carcinoma of the thyroid]]
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| * Neonatal tetany
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| * [[Nephrotic Syndrome]]
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| * Osteoblastic metastases
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| * [[Osteoporosis]]
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| * Polyglandular autoimmune syndrome
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| * Postoperative
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| * [[Pseudohypoparathyroidism]]
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| * [[Renal Failure]]
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| * [[Rhabdomyolysis]]
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| * [[Rickets]]
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| * [[Sepsis]]
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| * [[Septic shock]]
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| * [[Short Bowel Syndrome]]
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| * Steroid therapy
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| * [[Thyroid cancer]]
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| * [[Transfusion]] of citrated blood
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| * [[Tumor Lysis Syndrome]]
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| * [[Vitamin D deficiency]]
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| == Diagnosis == | | ==[[Hypocalcemia natural history, complications and prognosis|Natural History, Complications and Prognosis]]== |
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| === History and Symptoms === | | ==Diagnosis== |
| * [[Fatigue]]
| | [[Hypocalcemia history and symptoms|History and Symptoms]] | [[Hypocalcemia physical examination|Physical Examination]] | [[Hypocalcemia laboratory findings|Laboratory Findings]] | [[Hypocalcemia electrocardiogram|Electrocardiogram]] | [[Hypocalcemia x ray|X Ray]] | [[Hypocalcemia CT|CT]] | [[Hypocalcemia MRI|MRI]] | [[Hypocalcemia echocardiography or ultrasound|Echocardiography or Ultrasound]] | [[Hypocalcemia other imaging findings|Other Imaging Findings]] | [[Hypocalcemia other diagnostic studies|Other Diagnostic Studies]] |
| * [[Weakness]]
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| * [[Muscle cramp]]ing and spasm
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| * [[Nausea]] and [[vomiting]]
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| * [[Abdominal pain]]
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| * [[Depression]]
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| * [[Irritability]]
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| * [[Delirium]]
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| * [[Psychosis]]
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| * [[Seizures]] (with severe hypocalcemia)
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| * [[Perioral]] tingling and [[parasthesia]], 'pins and needles' sensation over the extremities of hands and feet. This is the earliest symptom of hypocalcemia.
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| ==Signs== | | ==Treatment== |
| * [[Tetany (medical sign)|Tetany]], carpopedal spasm are seen.
| | [[Hypocalcemia medical therapy|Medical Therapy]] | [[Hypocalcemia surgery|Surgery]] | [[Hypocalcemia primary prevention|Primary Prevention]] | [[Hypocalcemia secondary prevention|Secondary Prevention]] | [[Hypocalcemia cost-effectiveness of therapy|Cost-Effectiveness of Therapy]] | [[Hypocalcemia future or investigational therapies|Future or Investigational Therapies]] |
| * Latent tetany
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| ** [[Trousseau sign of latent tetany]] (eliciting carpal spasm by inflating the [[blood pressure]] cuff and maintaining the cuff pressure above [[systolic]])
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| ** [[Chvostek's sign]] (tapping of the inferior portion of the [[zygoma]] will produce facial spasms)
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| * Tendon reflexes are hyperactive
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| * Life threatening complications
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| ** [[Laryngospasm]]
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| ** [[Cardiac arrhythmia]]s
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| ==Clinical Features Associated with Hypocalcemia== | | ==Case Studies== |
| | [[Hypocalcemia case study one|Case #1]] |
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| * [[Abdominal pain]]
| | ==Related Chapters== |
| * [[Alopecia]]
| | * [[Calcium metabolism|Calcium Metabolism]] |
| * [[Anxiety]]
| | * [[Hypercalcaemia]] |
| * [[Atopic eczema]]
| | * [[Calcium deficiency (plant disorder)|Calcium Deficiency (Plant Disorder)]] |
| * [[Biliary colic]]
| | * [[Hypomagnesemia with secondary hypocalcemia|Hypomagnesemia with Secondary Hypocalcemia]] |
| * [[Brittle nails]]
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| * [[Bronchial spasm]]
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| * Calcification of cerebral cortex or cerebellum
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| * [[Cardiomyopathy]]
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| * [[Choreoathetosis]]
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| * [[Chvostek's sign]]
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| * Coarse hair
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| * [[Confusion]]
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| * [[Congestive heart failure]]
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| * Delayed tooth eruption
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| * Disorientation
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| * [[Dry skin]]
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| * [[Dysphagia]]
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| * [[Dyspnea]]
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| * Dystonic spasms
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| * Enamel hypoplasia
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| * Exfoliative dermatitis
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| * Extrapyramidal signs due to calcification of basal ganglia
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| * [[Fatigue]]
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| * Impaired intellectual ability
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| * Impetigo herpetiformis
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| * Increased dental caries
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| * Increased intracranial pressure
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| * [[Irritability]]
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| * [[Laryngeal spasm]]
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| * [[Muscle cramp]]s
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| * Nonspecific EEG changes
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| * [[Papilledema]]
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| * [[Paresthesia]]
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| * [[Parkinsonism]]
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| * Personality disturbances
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| * [[Polymyositis]]
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| * Prolonged QT interval in EKG
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| * [[Psoriasis]]
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| * [[Psychoneurosis]]
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| * [[Psychosis]]
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| * [[Seizure]]s (focal, petit mal, grand mal)
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| * Shortened premolar roots
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| * Subcapsular cataracts
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| * [[Tetany]]
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| * Thickened lamina dura
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| * [[Trousseau's sign]]
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| * [[Wheezing]]
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| == Laboratory Findings == | |
| Suggested initial laboratory studies include the following:
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| * Serum calcium
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| * Ionized calcium
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| * [[Complete blood count]] | |
| * Blood urea nitrogen (BUN)/creatinine
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| * [[Magnesium]]
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| * [[Albumin]]
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| * [[Phosphorus]]
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| * Amylase/lipase
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| Additional laboratory studies to be obtained as part of a more complete evaluation include the following:
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| * [[Vitamin D]] levels | |
| * [[Parathyroid hormone]] | |
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| ==Electrocardiographic Findings==
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| # Prolongation of the [[QTc interval]] is the major EKG finding
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| # There is a lengthening of the interval between the end of the [[QRS]] and the beginning of the [[T wave]] (i.e. [[ST-segment]] lengthening).
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| ==EKG examples==
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| [[image:Hypocalcemia_ProlongedQT.jpg|thumb|left|300px|Prolonged QTc interval due to hypocalcemia]]
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| <br clear="left"/>
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| ==Management==
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| * Two [[ampoule]]s of [[intravenous]] [[calcium gluconate]] 10% is given slowly in a period of 10 minutes, or if the hypocalcemia is severe, [[calcium chloride]] is given instead. | |
| * Maintenance doses of both calcium and vitamin-D (often as 1,25-(OH)<sub>2</sub>-D<sub>3</sub>, i.e. [[calcitriol]])) are often necessary to prevent further decline.
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| ==References== | | ==References== |
| {{Reflist|2}} | | {{reflist|2}} |
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| == See also ==
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| * [[Calcium metabolism]]
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| * [[Hypercalcaemia]]
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| * [[Calcium deficiency (plant disorder)]]
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| * [[Hypomagnesemia with secondary hypocalcemia]]
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| ==External links==
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| * [http://www.clevelandclinicmeded.com/diseasemanagement/endocrinology/hypocal/hypocal.htm Cleveland Clinic]
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| * [http://www.endotext.org/parathyroid/parathyroid7/parathyroid7.htm Endotext]
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| * [http://www.chestjournal.org/cgi/content/full/119/2/668-a EKG abnormalities associated with hypocalcemia]
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| * [http://ndt.oxfordjournals.org/cgi/reprint/20/12/2855.pdf Seizures due to hypocalcaemia worsened by shifting towards alkalosis by bicarbonate therapy]
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| * [http://www-isu.indstate.edu/mary/lytenote.htm Electrolytes]
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| == Acknowledgements ==
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| The content on this page was first contributed by: C. Michael Gibson, M.S., M.D.
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| {{Electrocardiography}} | | {{Electrocardiography}} |
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