What does the "three low and one high" in hepatorenal syndrome mean?

Under normal circumstances, the "three lows and one high" in hepatorenal syndrome refer to low blood glucose, low blood pressure, and low blood sodium as the three lows; and elevated blood urea nitrogen as the one high. The details are as follows:

Hepatorenal syndrome is a severe clinical condition primarily caused by dual impairment of liver and kidney function. The "three lows" include low blood glucose, low blood pressure, and low blood sodium; while the "one high" refers to elevated blood urea nitrogen. Specifically, hypoglycemia occurs when liver dysfunction impairs the synthesis and release of glucose, resulting in abnormally low blood glucose levels. Hypoglycemia may cause symptoms such as dizziness, fatigue, cold sweats, and palpitations. Hypotension arises from fluid retention and abnormal distribution due to impaired liver and kidney function, leading to decreased blood pressure. Low blood pressure can result in dizziness, fainting, and increased cardiac workload. Hyponatremia occurs when impaired liver and kidney function reduce the body's ability to excrete water and regulate sodium ions, causing serum sodium levels to fall below the normal range. Hyponatremia may lead to symptoms including nausea, vomiting, and seizures.

Elevated blood urea nitrogen (BUN) in hepatorenal syndrome results from reduced glomerular filtration rate, which hampers effective elimination of metabolic waste, thereby increasing BUN levels. High BUN may cause symptoms such as nausea, fatigue, and loss of appetite. Treatment of hepatorenal syndrome mainly includes improving liver and kidney function, correcting electrolyte imbalances, addressing underlying causes and symptoms, and preventing complications.

If patients experience any discomfort or symptoms, they should seek timely medical attention at a hospital to avoid delays in diagnosis and treatment.