Acute fatty liver of pregnancy explained

Acute fatty liver of pregnancy
Field:Obstetrics,
Perinatology,
Hepatology
Complications:Death, Disseminated intravascular coagulation
Onset:Third trimester of pregnancy
Causes:Long-chain 3-hydroxyacyl-coenzyme A dehydrogenase deficiency
Diagnosis:Clinical history and physical examination
Liver biopsy (rarely needed)
Treatment:Prompt delivery of the infant,
Intensive supportive care
Liver transplantation
Frequency:1 in 7,000 to 1 in 15,000 pregnancies
Deaths:18%

Acute fatty liver of pregnancy is a rare life-threatening complication of pregnancy that occurs in the third trimester or the immediate period after delivery.[1] It is thought to be caused by a disordered metabolism of fatty acids by mitochondria in the fetus, caused by long-chain 3-hydroxyacyl-coenzyme A dehydrogenase deficiency.[2] This leads to decreased metabolism of long chain fatty acids by the feto-placental unit, causing subsequent rise in hepatotoxic fatty acids in maternal plasma. The condition was previously thought to be universally fatal,[3] but aggressive treatment by stabilizing the mother with intravenous fluids and blood products in anticipation of early delivery has improved prognosis.[4]

Signs and symptoms

Acute fatty liver of pregnancy (or hepatic lipidosis of pregnancy) usually manifests in the third trimester of pregnancy, but may occur any time in the second half of pregnancy, or in the puerperium, the period immediately after delivery.[1] On average, the disease presents during the 35th or 36th week of pregnancy.[5] The usual symptoms in the mother are non-specific including nausea, vomiting, anorexia (or lack of desire to eat) and abdominal pain; excessive thirst may be the earliest symptom without overlap with otherwise considered normal pregnancy symptoms;[5] however, jaundice and fever may occur in as many as 70% of patients.[1] [6]

In patients with more severe disease, pre-eclampsia may occur, which involves elevation of blood pressure and accumulation of fluid (termed oedema).[5] This may progress to involvement of additional systems, including acute kidney failure,[7] hepatic encephalopathy,[8] and pancreatitis.[9] There have also been reports of diabetes insipidus complicating this condition.[10]

Many laboratory abnormalities are seen in acute fatty liver of pregnancy. Liver enzymes are elevated, with the AST and ALT enzymes ranging from minimal elevation to 1000 IU/L, but usually staying in the 300-500 range.[1] Bilirubin is almost universally elevated. Alkaline phosphatase is often elevated in pregnancy due to production from the placenta, but may be additionally elevated.[4] Other abnormalities may include an elevated white blood cell count, hypoglycemia, elevated coagulation parameters, including the international normalized ratio, and decreased fibrinogen.[1] [4] [5] Frank disseminated intravascular coagulation, or DIC, may occur in as many as 70% of people.[1]

Abdominal ultrasound may show fat deposition in the liver, but, as the hallmark of this condition is microvesicular steatosis (see pathology below), this is not seen on ultrasound.[11] Rarely, the condition can be complicated by rupture or necrosis of the liver, which may be identified by ultrasound.

Pathophysiology

The understanding of the causes of acute fatty liver of pregnancyhas been improved by advances in mitochondrial biochemistry. Deficiency of LCHAD (3-hydroxyacyl-CoA dehydrogenase) leads to an accumulation of medium and long chain fatty acids. When this occurs in the foetus, the unmetabolized fatty acids will re-enter the maternal circulation through the placenta, and overwhelm the beta-oxidation enzymes of the mother. The gene responsible for LCHAD has been isolated, and the most common mutation found in acute fatty liver of pregnancy is the E474Q missense mutation.[12] LCHAD deficiency is autosomal recessive in inheritance and mothers are often found to be heterozygous for the affected mutation.[13]

Diagnosis

The diagnosis of acute fatty liver of pregnancy is usually made on clinical grounds by the treating physician, but differentiation from other conditions affecting the liver may be difficult.[1] The diagnosis of acute fatty liver of pregnancy is suggested by jaundice with a lesser elevation of liver enzymes, elevated white blood cell count, disseminated intravascular coagulation, and a clinically unwell patient.[4]

A liver biopsy can provide a definitive diagnosis,[14] but is not always done, due to the increased chance of bleeding in acute fatty liver of pregnancy.[15] Often testing will be done to exclude more common conditions that present in a similar fashion, including viral hepatitis,[16] pre-eclampsia,[5] HELLP syndrome,[4] intrahepatic cholestasis of pregnancy,[1] and autoimmune hepatitis.[3]

Pathology

If a liver biopsy is needed for diagnosis of the condition, the mother should be appropriately stabilized and treated to reduce bleeding related complications. The diagnosis can be made by a frozen-section (as opposed to a specimen in formalin) that is stained with the Oil red O stain, that shows microvesicular steatosis (or small collections of fat within the liver cells). The microvesicular steatosis usually spares zone one of the liver, which is the area closest to the hepatic artery. On the regular trichrome stain, the liver cell cytoplasm shows a foamy appearance due to the prominence of fat. Necrosis is rarely seen. The diagnosis can be enhanced by electron microscopy which can be used to confirm the presence of microvesicular steatosis, and specifically the presence of megamitochondria and paracrystalline inclusions.[17] [18] Liver diseases with similar appearances include Reye's syndrome, drug-induced hepatitis from agents with mitochondrial toxicity, including nucleoside reverse transcriptase inhibitors used to treat HIV,[19] and a rare condition known as Jamaican vomiting sickness which is caused by the eating of the unripened Ackee fruit.[20]

Treatment

Acute fatty liver of pregnancy is best treated in a centre with expertise in hepatology, high-risk obstetrics, maternal-fetal medicine and neonatology. The physicians who treat this condition will often consult with experts in liver transplantation in severe cases. Admission to the intensive care unit is recommended.[1]

Initial treatment involves supportive management with intravenous fluids, intravenous glucose and blood products, including fresh frozen plasma and cryoprecipitate to correct DIC. The foetus should be monitored with cardiotocography. After the mother is stabilized, arrangements are usually made for delivery. This may occur vaginally, but, in cases of severe bleeding or compromise of the mother's status, a caesarian section may be needed.[1] Often AFLP is not diagnosed until the mother and baby are in trouble, so it is most likely that an emergency C-section is needed.

The complications of acute fatty liver of pregnancy may require treatment after delivery, especially if pancreatitis occurs.[9] Liver transplantation is rarely required for treatment of the condition, but may be needed for mothers with severe DIC, those with rupture of the liver, or those with severe encephalopathy.[21]

Epidemiology

Acute fatty liver of pregnancy is a rare condition and occurs in approximately one in 7,000 to one in 15,000 pregnancies.[3] [18] The mortality from acute fatty liver of pregnancy has been reduced significantly to 18%, and is now related primarily to complications, particularly DIC (Disseminated Intravascular Coagulation) and infections.[1] [3] After delivery, most mothers do well, as the stimulus for fatty acid overload is removed. The disease can recur in future pregnancies, with a calculated genetic chance of 25%; the actual rate is lower, however.[22] Mortality of the foetus has also diminished significantly, but still remains 23%,[23] and may be related to the need for premature delivery.[1]

History

The disease was first described in 1940 by H. L. Sheehan as an "acute yellow atrophy" of the liver, then thought to be related to delayed chloroform poisoning.[1] [24]

See also

Notes and References

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  2. Bellig LL . Maternal acute fatty liver of pregnancy and the associated risk for long-chain 3-hydroxyacyl-coenzyme a dehydrogenase (LCHAD) deficiency in infants . Advances in Neonatal Care. 4 . 1 . 26–32 . 2004 . 14988877 . 10.1016/j.adnc.2003.12.001. 29356240 .
  3. Mjahed K, Charra B, Hamoudi D, Noun M, Barrou L . Acute fatty liver of pregnancy . Archives of Gynecology and Obstetrics. 274 . 6 . 349–353 . 2006 . 16868757 . 10.1007/s00404-006-0203-6 . 24784165 .
  4. Riely CA . Liver disease in the pregnant patient. American College of Gastroenterology . The American Journal of Gastroenterology. 94 . 7 . 1728–1732 . 1999 . 10.1111/j.1572-0241.1999.01199.x . 10406228 . 36694459 . free .
  5. Riely CA . Acute fatty liver of pregnancy . Seminars in Liver Disease. 7 . 1 . 47–54 . 1987 . 3296215 . 10.1055/s-2008-1040563.
  6. Riely CA, Latham PS, Romero R, Duffy TP . Acute fatty liver of pregnancy. A reassessment based on observations in nine patients . Annals of Internal Medicine. 106 . 5 . 703–6 . 1987 . 3565968 . 10.7326/0003-4819-106-5-703.
  7. Koroshi A, Babameto A . Acute renal failure during acute fatty liver of pregnancy . Nephrology Dialysis Transplantation. 17 . 6 . 1110–1112 . 2002 . 12032205 . 10.1093/ndt/17.6.1110. free .
  8. Aggarwal R . Hepatic encephalopathy in pregnancy . Indian Journal of Gastroenterology . 22 Suppl 2 . S78–80 . 2003 . 15025263 .
  9. Moldenhauer JS, O'brien JM, Barton JR, Sibai B . Acute fatty liver of pregnancy associated with pancreatitis: a life-threatening complication . American Journal of Obstetrics and Gynecology. 190 . 2 . 502–505 . 2004 . 14981397 . 10.1016/j.ajog.2003.09.022 .
  10. Kennedy S, Hall PM, Seymour AE, Hague WM . Transient diabetes insipidus and acute fatty liver of pregnancy . BJOG: An International Journal of Obstetrics and Gynaecology. 101 . 5 . 387–91 . 1994 . 8018608 . 10.1111/j.1471-0528.1994.tb11909.x. 11869406 .
  11. Castro MA, Ouzounian JG, Colletti PM, Shaw KJ, Stein SM, Goodwin TM . Radiologic studies in acute fatty liver of pregnancy. A review of the literature and 19 new cases . The Journal of Reproductive Medicine. 41 . 11 . 839–43 . 1996 . 8951135 .
  12. IJlst L, Oostheim W, Ruiter JP, Wanders RJ . Molecular basis of long-chain 3-hydroxyacyl-CoA dehydrogenase deficiency: identification of two new mutations . Journal of Inherited Metabolic Disease . 20 . 3 . 420–422 . 1997 . 9266371 . 10.1023/A:1005310903004 . 23046057 .
  13. Wanders RJ, Vreken P, den Boer ME, Wijburg FA, van Gennip AH, IJlst L . Disorders of mitochondrial fatty acyl-CoA beta-oxidation . Journal of Inherited Metabolic Disease . 22 . 4 . 442–487 . 1999 . 10407780 . 10.1023/A:1005504223140 . 35795159.
  14. Brunt EM . Liver biopsy interpretation for the gastroenterologist . Current Gastroenterology Reports. 2 . 1 . 27–32 . 2000 . 10981000 . 10.1007/s11894-000-0048-2. 39207958 .
  15. Castro MA, Goodwin TM, Shaw KJ, Ouzounian JG, McGehee WG . Disseminated intravascular coagulation and antithrombin III depression in acute fatty liver of pregnancy . American Journal of Obstetrics and Gynecology. 174 . 1 Pt 1 . 211–216 . 1996 . 8572009 . 10.1016/S0002-9378(96)70396-4.
  16. Pang WW, Lei CH, Chang DP, Yang TF, Chung YT, Huang MH . Acute jaundice in pregnancy: acute fatty liver or acute viral hepatitis? . Acta Anaesthesiologica Sinica. 37 . 3 . 167–70 . 1999 . 10609353 .
  17. Bacq Y . Acute fatty liver of pregnancy . Seminars in Perinatology. 22 . 2 . 134–140 . 1998 . 9638907 . 10.1016/S0146-0005(98)80045-1.
  18. Reyes H . Acute fatty liver of pregnancy: a clinical study of 12 episodes in 11 patients . Gut. 35 . 1 . 101–106 . 1994 . 8307428 . 1374642 . 10.1136/gut.35.1.101. vanc . Sandoval L . Wainstein A . 3 . Ribalta . J . Donoso . S . Smok . G . Rosenberg . H . Meneses . M.
  19. Montessori V, Harris M, Montaner JS . Hepatotoxicity of nucleoside reverse transcriptase inhibitors . Seminars in Liver Disease. 23 . 2 . 167–172 . 2003 . 12800069 . 10.1055/s-2003-39947 .
  20. Hautekeete ML, Degott C, Benhamou JP . Microvesicular steatosis of the liver . Acta Clinica Belgica. 45 . 5 . 311–26 . 1990 . 2177300 . 10.1080/17843286.1990.11718105.
  21. Pereira SP, O'Donohue J, Wendon J, Williams R . Maternal and perinatal outcome in severe pregnancy-related liver disease . Hepatology. 26 . 5 . 1258–1262 . 1997 . 9362370 . 10.1002/hep.510260525 . free .
  22. Tein I . Metabolic disease in the foetus predisposes to maternal hepatic complications of pregnancy . Pediatric Research. 47 . 1 . 6–8 . 2000 . 10625076 . 10.1203/00006450-200001000-00005. free .
  23. Fesenmeier MF, Coppage KH, Lambers DS, Barton JR, Sibai BM . Acute fatty liver of pregnancy in 3 tertiary care centers . American Journal of Obstetrics and Gynecology. 192 . 5 . 1416–1419 . 2005 . 15902124 . 10.1016/j.ajog.2004.12.035 .
  24. Sheehan HL . The pathology of acute yellow atrophy and delayed chloroform poisoning . Journal of Obstetrics and Gynaecology of the British Empire. 47 . 49–62 . 1940 . 10.1111/j.1471-0528.1940.tb14731.x. 72493420 .