"Neurotoxicity in the setting of hepatic encephalopathy is considered multifactorial, with hyperammonaemia playing a crucial role due to its detrimental effects on glutamine regulation 4. Excess ammonia in the blood crosses the blood-brain barrier, accumulating within astrocytes. This leads to an upregulation of the conversion of glutamate to glutamine via glutamine synthetase 17,18. High levels of intracellular glutamine increase osmolarity, causing astrocyte swelling, which impairs the astrocyte's ability to regulate neurotransmission at both pre- and post-synaptic neurones."
"Neurotoxicity in the setting of hepatic encephalopathy is considered multifactorial, with hyperammonaemia playing a crucial role due to its detrimental effects on glutamine regulation 4. Excess ammonia in the blood crosses the blood-brain barrier, accumulating within astrocytes. This leads to an upregulation of the conversion of glutamate to glutamine via glutamine synthetase 17,18. High levels of intracellular glutamine increase osmolarity, causing astrocyte swelling, which impairs the astrocyte's ability to regulate neurotransmission at both pre- and post-synaptic neurones."
"T1: high signal within the caudate nucleus, globus pallidus, putamen and anterior midbrain due to deposition of manganese 15,16"
"SWI: nearly one-half have microhaemorrhages of white matter or cortex 8"
"MR spectroscopy: may show an elevated glutamine/glutamate peak coupled with decreased myoinositol and choline signals on proton MR spectroscopy 1,7"
"The vast majority of patients have portosystemic shunts in the setting of cirrhosis, either from the development of spontaneous shunting or as a result of transjugular intrahepatic portosystemic shunting (TIPS) 7. The clinical spectrum can rarely manifest in individuals who have portosystemic bypass without any associated intrinsic hepatocellular disease. The broader term "portosystemic encephalopathy" can be used for this reason."
"The consensus guidelines published in 2014 from the American Association for the Study of Liver Diseases (AASLD) and the European Association for the Study of the Liver (EASL) states that hepatic encephalopathy can be classified according to 13:"
"The consensus guidelines published in 2014 from the American Association for the Study of Liver Diseases (AASLD) and the European Association for the Study of the Liver (EASL) states that hepatic encephalopathy can be classified according to 13:"
"Treatment usually entails the careful cessation of any offending agents (e.g. toxins, chemotherapeutic agents, antiseizure medications), treating contributing conditions (e.g. sepsis, GI bleeding), nutritional support, ammonia-lowering agents (e.g. lactulose, rifaximin) and in some cases haemofiltration to remove excess ammonia 13."
"Neurotoxicity in the setting of hepatic encephalopathy is considered multifactorial, with hyperammonaemia playing a crucial role due to its detrimental effects on glutamine regulation 4. Excess ammonia in the blood crosses the blood-brain barrier, accumulating within astrocytes. This leads to an upregulation of the conversion of glutamate to glutamine via glutamine synthetase 17,18. High levels of intracellular glutamine increase osmolarity, causing astrocyte swelling, which impairs the astrocyte's ability to regulate neurotransmission at both pre- and post-synaptic neurones."
"Neurotoxicity in the setting of hepatic encephalopathy is considered multifactorial, with hyperammonaemia playing a crucial role due to its detrimental effects on glutamine regulation 4. Excess ammonia in the blood crosses the blood-brain barrier, accumulating within astrocytes. This leads to an upregulation of the conversion of glutamate to glutamine via glutamine synthetase 17,18. High levels of intracellular glutamine increase osmolarity, causing astrocyte swelling, which impairs the astrocyte's ability to regulate neurotransmission at both pre- and post-synaptic neurones."
"Wernicke encephalopathy"
Expected headings
"Grading"
"The clinical manifestations of hepatic encephalopathy range widely from chronic episodic subclinical neurological dysfunction to acute fulminant neurological impairment, coma and death 4."
"grade 0: no alteration in consciousness, intellectual function, personality or behaviour"
"grade 1: trivial lack of awareness, euphoria or anxiety, shortened attention span, impairment of addition or subtraction"
"T1: high signal within the caudate nucleus, globus pallidus, putamen and anterior midbrain due to deposition of manganese 15,16"
"gastrointestinal bleed (e.g. from varices)"
"dietary intake of large quantities of protein (e.g. meat)"
"hyponatraemia or hypokalaemia (e.g. from diuretics)"
"Treatment usually entails the careful cessation of any offending agents (e.g. toxins, chemotherapeutic agents, antiseizure medications), treating contributing conditions (e.g. sepsis, GI bleeding), nutritional support, ammonia-lowering agents (e.g. lactulose, rifaximin) and in some cases haemofiltration to remove excess ammonia 13."