, one of the main causes of the condition, new research suggests.
The study of more than 68,000 individuals in the general population diagnosed with dementia between 2009 and 2019 found that almost 13% had FIB-4 scores indicative of cirrhosis and potential hepatic encephalopathy.
The findings, recently published online in The American Journal of Medicine, corroborate and extend the researchers’ previous work, which showed that about 10% of US veterans with a dementia diagnosis may in fact have hepatic encephalopathy.
“We need to increase awareness that cirrhosis and related brain complications are common, silent, but treatable when found,” said corresponding author Jasmohan Bajaj, MD, of Virginia Commonwealth University and Richmond VA Medical Center, Richmond, Virginia. “Moreover, these are being increasingly diagnosed in older individuals.”
“Cirrhosis can also predispose patients to liver cancer and other complications, so diagnosing it in all patients is important, regardless of the hepatic encephalopathy-dementia connection,” he said.
FIB-4 Is Key
Dr. Bajaj and colleagues analyzed data from 72 healthcare centers on 68,807 nonveteran patients diagnosed with dementia at two or more physician visits between 2009 and 2019. Patients had no prior cirrhosis diagnosis, the mean age was 73 years, 44.7% were men, and 78% were White.
The team measured the prevalence of two high FIB-4 scores (> 2.67 and > 3.25), selected for their strong predictive value for advanced cirrhosis. Researchers also examined associations between high scores and multiple comorbidities and demographic factors.
Alanine aminotransferase (ALT), aspartate aminotransferase (AST), and platelet labs were collected up to 2 years after the index dementia diagnosis because they are used to calculate FIB-4.
The mean FIB-4 score was 1.78, mean ALT was 23.72 U/L, mean AST was 27.42 U/L, and mean platelets were 243.51 × 109/µL.
A total of 8683 participants (12.8%) had a FIB-4 score greater than 2.67 and 5185 (7.6%) had a score greater than 3.25.
In multivariable logistic regression models, FIB-4 greater than 3.25 was associated with viral hepatitis (odds ratio [OR], 2.23), congestive heart failure (OR,1.73), HIV (OR, 1.72), male gender (OR, 1.42), alcohol use disorder (OR, 1.39), and chronic kidney disease (OR, 1.38).
FIB-4 greater than 3.25 was inversely associated with White race (OR, 0.76) and diabetes (OR, 0.82).
The associations were similar when using a threshold score of greater than 2.67.
“With the aging population, including those with cirrhosis, the potential for overlap between hepatic encephalopathy and dementia has risen and should be considered in the differential diagnosis,” the authors wrote. “Undiagnosed cirrhosis and potential hepatic encephalopathy can be a treatable cause of or contributor towards cognitive impairment in patients diagnosed with dementia.”
Providers should use the FIB-4 index as a screening tool to detect cirrhosis in patients with dementia, they concluded.
The team’s next steps will include investigating barriers to the use of FIB-4 among practitioners, Dr. Bajaj said.
Incorporating use of the FIB-4 index into screening guidelines “with input from all stakeholders, including geriatricians, primary care providers, and neurologists … would greatly expand the diagnosis of cirrhosis and potentially hepatic encephalopathy in dementia patients,” Dr. Bajaj said.
The study had a few limitations, including the selected centers in the cohort database, lack of chart review to confirm diagnoses in individual cases, and the use of a modified FIB-4, with age capped at 65 years.