rhabdomyolysis

横紋筋融解症

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/11/07 13:09:16」(JST)

wiki en

[Wiki en表示]

Rhabdomyolysis
Urine from a person with rhabdomyolysis showing the characteristic brown discoloration as a result of myoglobinuria
Classification and external resources
Pronunciation	/ˌræbdɵmaɪˈɒlɨsɪs/
Specialty	Critical care medicine, nephrology
ICD-10	M62.8, T79.5, T79.6
ICD-9-CM	728.88
DiseasesDB	11472
MedlinePlus	000473
eMedicine	emerg/508 ped/2003
MeSH	D012206

Rhabdomyolysis is a condition in which damaged skeletal striated muscle breaks down rapidly. Breakdown products of damaged muscle cells are released into the bloodstream; some of these, such as the protein myoglobin, are harmful to the kidneys and may lead to kidney failure. The severity of the symptoms, which may include muscle pains, vomiting, and confusion, depends on the extent of muscle damage and whether kidney failure develops. The muscle damage may be caused by physical factors (e.g., crush injury, strenuous exercise, medications, drug abuse, and infections). Some people have a hereditary muscle condition that increases the risk of rhabdomyolysis. The diagnosis is usually made with blood tests and urinalysis. The mainstay of treatment is generous quantities of intravenous fluids, but may include dialysis or hemofiltration in more severe cases.

Rhabdomyolysis and its complications are significant problems for those injured in disasters such as earthquakes and bombings. Relief efforts in areas struck by earthquakes often include medical teams with the skills and equipment to treat survivors with rhabdomyolysis. The disease was first described in the 20th century, and important discoveries as to its mechanism were made during the Blitz of London in 1941. Horses may also develop rhabdomyolysis from a variety of causes. The word rhabdomyolysis uses the combining forms rhabdo- + myo- + -lysis, yielding "striated muscle breakdown".

Signs and symptoms

The symptoms of rhabdomyolysis depend on its severity and whether kidney failure develops. Milder forms may not cause any muscle symptoms, and the diagnosis is based on abnormal blood tests in the context of other problems. More severe rhabdomyolysis is characterized by muscle pain, tenderness, weakness and swelling of the affected muscles. If the swelling is very rapid, as may happen after someone is released from under a collapsed building, the movement of fluid from the bloodstream into damaged muscle may cause low blood pressure and shock. Other symptoms are nonspecific and result either from the consequences of muscle tissue breakdown or from the condition that originally led to the muscle breakdown. Release of the components of muscle tissue into the bloodstream causes electrolyte disturbances, which can lead to nausea, vomiting, confusion, coma or abnormal heart rate and rhythm. The urine may be dark, often described as "tea-colored", due to the presence of myoglobin. Damage to the kidneys may give rise to decreased or absent urine production, usually 12 to 24 hours after the initial muscle damage.

Swelling of damaged muscle occasionally leads to compartment syndrome—compression of surrounding tissues, such as nerves and blood vessels, in the same fascial compartment—leading to the loss of blood supply and damage or loss of function in the part(s) of the body supplied by these structures. Symptoms of this complication include pain or reduced sensation in the affected limb. A second recognized complication is disseminated intravascular coagulation (DIC), a severe disruption in blood clotting that may lead to uncontrollable bleeding.

Causes

Any form of muscle damage of sufficient severity can cause rhabdomyolysis. Multiple causes can be present simultaneously in one person. Some have an underlying muscle condition, usually hereditary in nature, that makes them more prone to rhabdomyolysis.

Common and important causes

Common and important causes

Type	Causes
Exertional rhabdomyolysis	Extreme physical exercise (particularly when poorly hydrated), delirium tremens (alcohol withdrawal), tetanus, prolonged seizures or status epilepticus
Crush	Crush syndrome, blast injury, car accident, physical torture or abuse, or confinement in a fixed position such as after a stroke, due to alcohol intoxication or in prolonged surgery
Blood supply	Arterial thrombosis (blood clots forming locally) or embolism (clots or other debris from elsewhere in the body), clamping of an artery during surgery
Metabolism	Hyperglycemic hyperosmolar state, hyper- and hyponatremia (elevated or reduced blood sodium levels), hypokalemia (low potassium levels), hypocalcemia (low calcium levels), hypophosphatemia (low phosphate levels), ketoacidosis (e.g., in diabetic ketoacidosis) or hypothyroidism (abnormally low thyroid function)
Body temperature	Hyperthermia (high body temperature) and heat illness, hypothermia (very low body temperature)
Drugs and toxins	Many medications increase the risk of rhabdomyolysis. The most important ones are: Statins and fibrates, both used for elevated cholesterol, especially in combination; cerivastatin (Baycol) was withdrawn in 2001 after numerous reports of rhabdomyolysis. Other statins have a small risk of 0.44 cases per 10,000 person-years. Previous chronic kidney disease and hypothyroidism increase the risk of myopathy due to statins. It is also more common in the elderly, those who are severely disabled, and when statins are used in combination with particular other medicines, such as ciclosporin. Antipsychotic medications may cause neuroleptic malignant syndrome, which can cause severe muscle rigidity with rhabdomyolysis and hyperpyrexia Neuromuscular blocking agents used in anesthesia may result in malignant hyperthermia, also associated with rhabdomyolysis Medications that cause serotonin syndrome, such as SSRIs Medications that interfere with potassium levels, such as diuretics Poisons linked to rhabdomyolysis are heavy metals and venom from insects or snakes. Hemlock may cause rhabdomyolysis, either directly or after consuming quail that have fed on it. Haff disease is rhabdomyolysis after consuming fish; a toxic cause is suspected but has not been proven. Drugs of abuse, including: alcohol, amphetamine, cocaine, heroin, ketamine, LSD and MDMA (ecstasy)
Infection	Coxsackie virus, influenza A virus and influenza B virus, Epstein-Barr virus, primary HIV infection, Plasmodium falciparum (malaria), herpes viruses, Legionella pneumophila and salmonella
Inflammation	Autoimmune muscle damage: polymyositis, dermatomyositis

Genetic predisposition

Recurrent rhabdomyolysis may result from intrinsic muscle enzyme deficiencies, which are usually inherited and often appear during childhood. Many structural muscle diseases feature episodes of rhabdomyolysis that are triggered by exercise, general anesthesia or any of the other causes of rhabdomyolysis listed above. Inherited muscle disorders and infections together cause the majority of rhabdomyolysis in children.

The following hereditary disorders of the muscle energy supply may cause recurrent and usually exertional rhabdomyolysis:

• Glycolysis and glycogenolysis defects: McArdle's disease, phosphofructokinase deficiency, glycogen storage diseases VIII, IX, X and XI
• Lipid metabolism defects: carnitine palmitoyltransferase I and II deficiency, deficiency of subtypes of acyl CoA dehydrogenase (LCAD, SCAD, MCAD, VLCAD, 3-hydroxyacyl-coenzyme A dehydrogenase deficiency), thiolase deficiency
• Mitochondrial myopathies: deficiency of succinate dehydrogenase, cytochrome c oxidase and coenzyme Q10
• Others: glucose-6-phosphate dehydrogenase deficiency, myoadenylate deaminase deficiency and muscular dystrophies

Mechanism

Schematic diagram of myoglobin, a heme-containing protein that participates in oxygen storage in normal muscle but is responsible for kidney damage in rhabdomyolysis

Damage to skeletal muscle may take various forms. Crush and other physical injuries cause damage to muscle cells directly or interfere with blood supply, while non-physical causes interfere with muscle cell metabolism. When damaged, muscle tissue rapidly fills with fluid from the bloodstream, including sodium ions. The swelling itself may lead to destruction of muscle cells, but those cells that survive are subject to various disruptions that lead to rise in intracellular calcium ions; the accumulation of calcium outside the sarcoplasmic reticulum leads to continuous muscle contraction and depletion of ATP, the main carrier of energy in the cell. ATP depletion can itself lead to uncontrolled calcium influx. The persistent contraction of the muscle cell leads to breakdown of intracellular proteins and disintegration of the cell.

Neutrophil granulocytes—the most abundant type of white blood cell—enter the muscle tissue, producing an inflammatory reaction and releasing reactive oxygen species, particularly after crush injury. Crush syndrome may also cause reperfusion injury when blood flow to decompressed muscle is suddenly restored.

The swollen, inflamed muscle may directly compress structures in the same fascial compartment, causing compartment syndrome. The swelling may also further compromise blood supply into the area. Finally, destroyed muscle cells release potassium ions, phosphate ions, the heme-containing protein myoglobin, the enzyme creatine kinase and uric acid (a breakdown product of purines from DNA) into the blood. Activation of the coagulation system may precipitate disseminated intravascular coagulation. High potassium levels may lead to potentially fatal disruptions in heart rhythm. Phosphate binds to calcium from the circulation, leading to low calcium levels in the blood.

Rhabdomyolysis may cause kidney failure by several mechanisms. The most important is the accumulation of myoglobin in the kidney tubules. Normally, the blood protein haptoglobin binds circulating myoglobin and other heme-containing substances, but in rhabdomyolysis the quantity of myoglobin exceeds the binding capacity of haptoglobin. Myoglobinuria, the presence of myoglobin in the urine, occurs when the level in plasma exceeds 0.5–1.5 mg/dl; once plasma levels reach 100 mg/dl, the concentration in the urine becomes sufficient for it to be visibly discolored and corresponds with the destruction of about 200 grams of muscle. As the kidneys reabsorb more water from the filtrate, myoglobin interacts with Tamm–Horsfall protein in the nephron to form casts (solid aggregates) that obstruct the normal flow of fluid; the condition is worsened further by high levels of uric acid and acidification of the filtrate, which increase cast formation. Iron released from the heme generates reactive oxygen species, damaging the kidney cells. In addition to the myoglobinuria, two other mechanisms contribute to kidney impairment: low blood pressure leads to constriction of the blood vessels and therefore a relative lack of blood flow to the kidney, and finally uric acid may form crystals in the tubules of the kidneys, causing obstruction. Together, these processes lead to acute tubular necrosis, the destruction of the cells of tubules. Glomerular filtration rate falls and the kidney is unable to perform its normal excretory functions. This causes disruption of electrolyte regulation, leading to a further rise in potassium levels, and interferes with vitamin D processing, further worsening the low calcium levels.

Diagnosis

The M-subunit of creatine kinase. In skeletal muscle, creatine kinase exists predominantly in dimers containing two M-subunits, also referred to as "CK-MM".

A diagnosis of rhabdomyolysis may be suspected in anyone who has suffered trauma, crush injury or prolonged immobilization, but it may also be identified at a later stage due to deteriorating kidney function (abnormally raised or increasing creatinine and urea levels, falling urine output) or reddish-brown discoloration of the urine.

General investigations

The most reliable test in the diagnosis of rhabdomyolysis is the level of creatine kinase (CK) in the blood. This enzyme is released by damaged muscle, and levels above 5 times the upper limit of normal (ULN) indicate rhabdomyolysis. Depending on the extent of the rhabdomyolysis, concentrations up to 100,000 U/l are not unusual. CK concentrations rise steadily for 12 hours after the original muscle injury, remain elevated for 1–3 days and then fall gradually. Initial and peak CK levels have a linear relationship with the risk of acute kidney failure: the higher the CK, the more likely it is that kidney damage will occur. There is no specific concentration of CK above which kidney impairment definitely occurs; concentrations below 20,000 U/l are unlikely to be associated with a risk of kidney impairment, unless there are other contributing risk factors. Mild rises without kidney impairment are referred to as "hyperCKemia". Myoglobin has a short half-life, and is therefore less useful as a diagnostic test in the later stages. Its detection in blood or urine is associated with a higher risk of kidney impairment. Despite this, use of urine myoglobin measurement is not supported by evidence as it lacks specificity and the research studying its utility is of poor quality.

Elevated concentrations of the enzyme lactate dehydrogenase (LDH) may be detected. Other markers of muscle damage, such as aldolase, troponin, carbonic anhydrase type 3 and fatty acid-binding protein (FABP), are mainly used in chronic muscle diseases. The transaminases, enzymes abundant in both liver and muscle tissue, are also usually increased; this can lead to the condition being confused with acute liver injury, at least in the early stages. The incidence of actual acute liver injury is 25% in people with non-traumatic rhabdomyolysis; the mechanism for this is uncertain.

High potassium levels tend to be a feature of severe rhabdomyolysis. Electrocardiography (ECG) may show whether the elevated potassium levels are affecting the conduction system of the heart, as suggested by the presence of T wave changes or broadening of the QRS complex. Low calcium levels may be present in the initial stage due to binding of free calcium to damaged muscle cells.

Urinalysis by urine test strip may reveal a positive result for "blood", even though no red blood cells can be identified on microscopy of the urine; this occurs because the reagent on the test strip reacts with myoglobin. The same phenomenon may happen in conditions that lead to hemolysis, the destruction of red blood cells; in hemolysis the blood serum is also visibly discolored, while in rhabdomyolysis it is normal. If kidney damage has occurred, microscopy of the urine also reveals urinary casts that appear pigmented and granular.

Complications

Compartment syndrome is a clinical diagnosis, i.e., no diagnostic test conclusively proves its presence or absence, but direct measurement of the pressure in a fascial compartment, and the difference between this pressure and the blood pressure, may be used to assess its severity. High pressures in the compartment and a small difference between compartment pressure and blood pressure indicate that the blood supply is likely to be insufficient, and that surgical intervention may be needed.

Disseminated intravascular coagulation, another complication of rhabdomyolysis and other forms of critical illness, may be suspected on the basis of unexpected bleeding or abnormalities in hematological tests, such as a decreasing platelet count or prolongation of the prothrombin time. The diagnosis can be confirmed with standard blood tests for DIC, such as D-dimer.

Underlying disorders

If an underlying muscle disease is suspected, for instance if there is no obvious explanation or there have been multiple episodes, it may be necessary to perform further investigations. During an attack, low levels of carnitine in the blood and high levels of acylcarnitine in blood and urine may indicate a lipid metabolism defect, but these abnormalities revert to normal during convalescence. Other tests may be used at that stage to demonstrate these disorders. Disorders of glycolysis can be detected by various means, including the measurement of lactate after exercise; a failure of the lactate to rise may be indicative of a disorder in glycolysis, while an exaggerated response is typical of mitochondrial diseases. Electromyography (EMG) may show particular patterns in specific muscle diseases; for instance, McArdle's disease and phosphofructokinase deficiency show a phenomenon called cramp-like contracture. There are genetic tests available for many of the hereditary muscle conditions that predispose to myoglobinuria and rhabdomyolysis.

Muscle biopsy can be useful if an episode of rhabdomyolysis is thought to be the result of an underlying muscle disorder. A biopsy sample taken during an episode is often uninformative, as it will show only evidence of cell death or may appear normal. Taking the sample is therefore delayed for several weeks or months. The histopathological appearance on the biopsy indicates the nature of the underlying disorder. For instance, mitochondrial diseases are characterised by ragged red fibers. Biopsy sites may be identified by medical imaging, such as magnetic resonance imaging, as the muscles may not be uniformly affected.

Treatment

The main goal of treatment is to treat shock and preserve kidney function. Initially this is done through the administration of generous amounts of intravenous fluids, usually isotonic saline (0.9% weight per volume sodium chloride solution). In victims of crush syndrome, it is recommended to administer intravenous fluids even before they are extracted from collapsed structures. This will ensure sufficient circulating volume to deal with the muscle cell swelling (which typically commences when blood supply is restored), and to prevent the deposition of myoglobin in the kidneys. Amounts of 6 to 12 liters over 24 hours are recommended. The rate of fluid administration may be altered to achieve a high urine output (200–300 ml/h in adults), unless there are other reasons why this might lead to complications, such as a history of heart failure.

While many sources recommend additional intravenous agents to reduce damage to the kidney, most of the evidence supporting this practice comes from animal studies, and is inconsistent and conflicting. Mannitol acts by osmosis to enhance urine production and is thought to prevent myoglobin deposition in the kidney, but its efficacy has not been shown in studies and there is a risk of worsening kidney function. The addition of bicarbonate to the intravenous fluids may alleviate acidosis (high acid level of the blood) and make the urine more alkaline to prevent cast formation in the kidneys; evidence suggesting that bicarbonate has benefits above saline alone is limited, and it can worsen hypocalcemia by enhancing calcium and phosphate deposition in the tissues. If urine alkalinization is used, the pH of the urine is kept at 6.5 or above. Furosemide, a loop diuretic, is often used to ensure sufficient urine production, but evidence that this prevents kidney failure is lacking.

Electrolytes

In the initial stages, electrolyte levels are often abnormal and require correction. High potassium levels can be life-threatening, and respond to increased urine production and renal replacement therapy (see below). Temporary measures include the administration of calcium to protect against cardiac complications, insulin or salbutamol to redistribute potassium into cells, and infusions of bicarbonate solution.

Calcium levels initially tend to be low, but as the situation improves calcium is released from where it has precipitated with phosphate, and vitamin D production resumes, leading to hypercalcemia (abnormally high calcium levels). This "overshoot" occurs in 20–30% of those people who have developed kidney failure.

Acute kidney impairment

A hemofiltration machine

Kidney dysfunction typically develops 1–2 days after the initial muscle damage. If supportive treatment is inadequate to manage this, renal replacement therapy (RRT) may be required. RRT removes excess potassium, acid and phosphate that accumulate when the kidneys are unable to function normally and is required until kidney function is regained.

Three main modalities of RRT are available: hemodialysis, continuous hemofiltration and peritoneal dialysis. The former two require access to the bloodstream (a dialysis catheter), while peritoneal dialysis is achieved by instilling fluid into the abdominal cavity and later draining it. Hemodialysis, which is normally done several times a week in chronic kidney disease, is often required on a daily basis in rhabdomyolysis. Its advantage over continuous hemofiltration is that one machine can be used multiple times a day, and that continuous administration of anticoagulant drugs is not necessary. Hemofiltration is more effective at removing large molecules from the bloodstream, such as myoglobin, but this does not seem to confer any particular benefit. Peritoneal dialysis may be difficult to administer in someone with severe abdominal injury, and it may be less effective than the other modalities.

Other complications

Compartment syndrome is treated with surgery to relieve the pressure inside the muscle compartment and reduce the risk of compression on blood vessels and nerves in that area. Fasciotomy is the incision of the affected compartment. Often, multiple incisions are made and left open until the swelling has reduced. At that point, the incisions are closed, often requiring debridement (removal of non-viable tissue) and skin grafting in the process. The need for fasciotomy may be decreased if mannitol is used, as it can relieve muscle swelling directly.

Disseminated intravascular coagulation generally resolves when the underlying causes are treated, but supportive measures are often required. For instance, if the platelet count drops significantly and there is resultant bleeding, platelets may be administered.

Prognosis

The prognosis depends on the underlying cause and whether any complications occur. Rhabdomyolysis complicated by acute kidney impairment in patients with traumatic injury may have a mortality rate of 20%. Admission to the intensive care unit is associated with a mortality of 22% in the absence of acute kidney injury, and 59% if kidney impairment occurs. Most people who have sustained kidney impairment due to rhabdomyolysis fully recover their kidney function.

Epidemiology

The exact incidence of rhabdomyolysis is difficult to establish, because different definitions have been used. In 1995, hospitals in the U.S. reported 26,000 cases of rhabdomyolysis. Up to 85% of people with major traumatic injuries will experience some degree of rhabdomyolysis. Of those with rhabdomyolysis, 10–50% develop acute kidney injury. The risk is higher in people with a history of illicit drug use, alcohol misuse or trauma when compared to muscle diseases, and it is particularly high if multiple contributing factors occur together. Rhabdomyolysis accounts for 7–10% of all cases of acute kidney injury in the U.S.

Crush injuries are common in major disasters, but especially so in earthquakes. The aftermath of the 1988 Spitak earthquake prompted the establishment, in 1995, of the Renal Disaster Relief Task Force, a working group of the International Society of Nephrology (a worldwide body of kidney experts). Its volunteer doctors and nurses assisted for the first time in the 1999 İzmit earthquake in Turkey, where 462 people received dialysis, with positive results. Treatment units are generally established outside the immediate disaster area, as aftershocks could potentially injure or kill staff and make equipment unusable.

History

Investigations of people injured in collapsed buildings during the Blitz of London led to numerous discoveries in the mechanisms underlying kidney impairment in rhabdomyolysis.

The Bible may contain an early account of rhabdomyolysis. In Numbers 11:4–6,31–33, the Pentateuch says that the Jews demanded meat while traveling in the desert; God sent quail in response to the complaints, and people ate large quantities of quail meat. A plague then broke out, killing numerous people. Rhabdomyolysis after consuming quail was described in more recent times and called coturnism (after Coturnix, the main quail genus). Migrating quail consume large amounts of hemlock, a known cause of rhabdomyolysis.

In modern times, early reports from the 1908 Messina earthquake and World War I on kidney failure after injury were followed by studies by London physicians Eric Bywaters and Desmond Beall, working at the Royal Postgraduate Medical School and the National Institute for Medical Research, on four victims of The Blitz in 1941. Myoglobin was demonstrated in the urine of victims by spectroscopy, and it was noted that the kidneys of victims resembled those of patients who had hemoglobinuria (hemoglobin rather than myoglobin being the cause of the kidney damage). In 1944 Bywaters demonstrated experimentally that the kidney failure was mainly caused by myoglobin. Already during the war, teams of doctors traveled to bombed areas to provide medical support, chiefly with intravenous fluids, as dialysis was not yet available. The prognosis of acute kidney failure improved markedly when dialysis was added to supportive treatment, which first happened during the 1950–1953 Korean War.

Other animals

Rhabdomyolysis is recognized in horses. Horses can develop a number of muscle disorders, many of which may progress to rhabdomyolysis. Of these, some cause isolated attacks of rhabdomyolysis (e.g., dietary deficiency in vitamin E and selenium, poisoning associated with pasture or agricultural poisons such as organophosphates), while others predispose to exertional rhabdomyolysis (e.g., the hereditary condition equine polysaccharide storage myopathy). 5–10% of thoroughbred horses and some standardbred horses suffer from the condition equine exertional rhabdomyolysis; no specific cause has been identified, but an underlying muscle calcium regulation disorder is suspected.

Rhabdomyolysis affecting horses may also occur in outbreaks; these have been reported in many European countries, and later in Canada, Australia, and the United States. It has been referred to as "atypical myopathy" or "myoglobinuria of unknown etiology". No single cause has yet been found, but various mechanisms have been proposed, and a seasonal pattern has been observed. Very high creatine kinase levels are detected, and mortality from this condition is 89%.

Notes

References

UpToDate Contents

全文を閲覧するには購読必要です。 To read the full text you will need to subscribe.

• 1. 横紋筋融解症の原因 causes of rhabdomyolysis
• 2. 横紋筋融解症の臨床症状および診断 clinical manifestations and diagnosis of rhabdomyolysis
• 3. ヘム色素誘発急性腎障害（急性腎不全）の予防および治療 prevention and treatment of heme pigment induced acute kidney injury acute renal failure
• 4. 代謝性ミオパチーへのアプローチ approach to the metabolic myopathies
• 5. 高リン血症の原因および治療の概要 overview of the causes and treatment of hyperphosphatemia

English Journal

• Combination of lipid metabolism alterations and their sensitivity to inflammatory cytokines in human lipin-1-deficient myoblasts.

• Michot C, Mamoune A, Vamecq J, Viou MT, Hsieh LS, Testet E, Lainé J, Hubert L, Dessein AF, Fontaine M, Ottolenghi C, Fouillen L, Nadra K, Blanc E, Bastin J, Candon S, Pende M, Munnich A, Smahi A, Djouadi F, Carman GM, Romero N, de Keyzer Y, de Lonlay P.SourceInserm U781, Imagine Institut des Maladies Génétiques, Université Paris Descartes et Centre de Référence des Maladies Héréditaires du Métabolisme, Hôpital Necker, AP-HP, Paris, France.
• Biochimica et biophysica acta.Biochim Biophys Acta.2013 Dec;1832(12):2103-14. doi: 10.1016/j.bbadis.2013.07.021. Epub 2013 Aug 6.
• Lipin-1 deficiency is associated with massive rhabdomyolysis episodes in humans, precipitated by febrile illnesses. Despite well-known roles of lipin-1 in lipid biosynthesis and transcriptional regulation, the pathogenic mechanisms leading to rhabdomyolysis remain unknown. Here we show that primary
• PMID 23928362

• Exercise-induced Myalgia may Limit the Cardiovascular Benefits of Statins.

• Opie LH.SourceHatter Institute for Cardiovascular Research in Africa, Department of Medicine, University of Cape Town Medical School, Anzio Road, Observatory, Cape Town, 7925, South Africa, lionel.opie@uct.ac.za.
• Cardiovascular drugs and therapy / sponsored by the International Society of Cardiovascular Pharmacotherapy.Cardiovasc Drugs Ther.2013 Dec;27(6):569-72. doi: 10.1007/s10557-013-6483-8.
• The positive health benefits of statins extend beyond the cardiovascular and include increased flow mediated dilation, decreased atrial fibrillation, modest antihypertensive effects and reduced risks of malignancies. Prominent among the statin side-effects are myalgia and muscular weakness, which ma
• PMID 23934075

• SLCO1B1 Genetic Variant Associated With Statin-Induced Myopathy: A Proof-of-Concept Study Using the Clinical Practice Research Datalink.

• Carr DF, O'Meara H, Jorgensen AL, Campbell J, Hobbs M, McCann G, van Staa T, Pirmohamed M.SourceDepartment of Molecular and Clinical Pharmacology, Wolfson Centre for Personalised Medicine, Liverpool, UK.
• Clinical pharmacology and therapeutics.Clin Pharmacol Ther.2013 Dec;94(6):695-701. doi: 10.1038/clpt.2013.161. Epub 2013 Aug 13.
• This study aimed to determine whether patients with statin-induced myopathy could be identified using the United Kingdom Clinical Practice Research Datalink, whether DNA could be obtained, and whether previously reported associations of statin myopathy with the SLCO1B1 c.521T>C and COQ2 rs4693075
• PMID 23942138

Japanese Journal

• RSウイルス感染症の経過中に横紋筋融解症を発症した重症心身障害児の1例

• 羽生 政子,荒川 千賀子,石井 和嘉子,遠藤 あゆみ,渕上 達夫,藤田 之彦,麦島 秀雄,KOHIRA Ryutaro
• 小児感染免疫 23(1), 17-21, 2011-04-01
• NAID 10028185597

• Hypoxic hepatitis in critically ill patients : incidence, etiology and risk factors fro mortality

• RAURICH Joan M.,LLOMPART-POU Juan Antonio,FERRERUELA Mireia,COLOMAR Asuncion,MOLINA Maria,ROYO Cristina,AYESTARAN Ignacio,IBANEZ Jordi
• Journal of anesthesia 25(1), 50-56, 2011-02-20
• NAID 10029021770

• 横紋筋融解症における筋傷害と急性腎機能障害発症の因果関係の検討

• 福島 紘子,武居 哲洋,藤澤 美智子 [他]
• ICUとCCU 35(5), 413-417, 2011-05
• NAID 40018899404

Related Links

• Rhabdomyolysis - Wikipedia, the free encyclopedia

Rhabdomyolysis pron.: /ˌræbdɵmaɪˈɒlɨsɪs/ is a condition in which damaged skeletal muscle tissue breaks down (Greek: λύσις –lysis) rapidly. Breakdown products of damaged muscle cells are released into the bloodstream; some of these ...

• Rhabdomyolysis Causes, Signs, Symptoms, and Treatment on ...

Read about rhabdomyolysis, the rapid destruction of skeletal muscle. Some causes include medications (statins), drugs or alcohol, electrolyte imbalances, viruses, infection, severe hypothyroidism and more.

Related Pictures

---

★リンクテーブル★

リンク元	「横紋筋融解症」「rhabdomyolytic」
拡張検索	「familial paroxysmal rhabdomyolysis」「acute recurrent rhabdomyolysis」「familial rhabdomyolysis」

「横紋筋融解症」

　　[★]

英

rhabdomyolysis

関

横紋筋

原因

also see 研修医直御法度第5版 157

• 過激な運動
• 外傷

• 横紋筋の外傷性挫滅

• 薬剤

• 向精神薬、HMG-CoA還元酵素阻害薬
• アルコールの過剰摂取

• 疾患

• 糖尿病性ケトアシドーシス
• 感染症
• 高体温症候群

• 熱射病(特に労作性)
• 悪性高熱症
• 悪性症候群

病態

• 筋から逸脱したミオグロビンが糸球体で濾過され尿細管へ　→　原尿が酸性の条件下でミオグロビンは尿細管上皮を障害　→　急性尿細管壊死　→　腎性腎不全 (ICU.608)

症状

• 種々の原因により横紋筋が破壊され、大量のミオグロビン血液中に流出
• 筋肉痛、脱力感、しびれ
• 急性尿細管壊死→急性腎不全

検査所見

筋逸脱酵素の上昇(ミオグロビン、クレアチニンキナーゼ、AST、LDH)

• 血中ミオグロビン↑(80μg/l)、尿中ミオグロビン↑(20μg/l)
• CPK：↑

• 正常の5倍以上あるいは1,000U/LのCKは臨床研究では横紋筋融解を示唆するとされてきた。CK 15,000 U/Lを上回る場合胃、重要の横紋筋融解症とミオグロビン尿性腎不全のリスク上昇を示唆する。(ICU.608)

• AST↑
• LDH↑

治療

• 原発疾患の治療
• 輸液：積極的な輸液がミオグロビン尿性腎不全の予防や進展抑制に繋がる(ICU.609)
• 重炭酸：尿のアルカリ化による尿細管障害の軽減効果は臨床的に証明されていない。
• ループ利尿薬・マニトール：有用性は証明されていない。
• 血液浄化療法：重症例で。腎障害の進展を防ぐために透析によりヘモグロビン、ミオグロビン、尿酸を透析に除去する目的での透析の使用は証明されていない。(参考2)

研修医直御法度症例帳 145

研修医直御法度第5版 157

• ミオグロビン尿による腎前性急性腎不全の予防的治療

1. 生理食塩水 200ml/hr 点滴静注　　←　　尿量は4ml/kg/hr目指す

2. 炭酸水素ナトリウム 100mEq 点滴静注　　←　　まぜるの禁止 (メイロン)

3. ラシックス 40mg 静注　　←　十分に輸液した後

4. マンニトール 25g 点滴静注　　←　十分に輸液した後

参考

• 1. [charged] Clinical manifestations, diagnosis, and causes of rhabdomyolysis - uptodate [1]
• 2. [charged] Prevention and treatment of heme pigment-induced acute kidney injury (acute renal failure) - uptodate [2]

「rhabdomyolytic」

　　[★]

• 横紋筋融解の

関

rhabdomyolysis

「familial paroxysmal rhabdomyolysis」

　　[★] 家族性発作性横紋筋融解症

「acute recurrent rhabdomyolysis」

　　[★] 急性再発性横紋筋融解症

「familial rhabdomyolysis」

　　[★] 家族性横紋筋融解症