Next steps and new questions
Future research should examine whether patients with MAFLD have elevated levels of biomarkers for inflammation, such as interleukin 6, Mr. Vázquez-Medina said. A “chronic low proinflammatory state” may be the key to understanding the vulnerability of patients to MAFLD to COVID-19, he speculated.
The metabolic traits associated with MAFLD could explain the higher mortality and intubation rates with COVID, said Rohit Loomba, MD, MHSc, a professor of medicine in the division of gastroenterology at the University of California, San Diego, who was not involved in the study.
“Hypertension, diabetes, and obesity increase the risk of complications from COVID in all patients, whether they have been diagnosed with NAFLD or not,” he told this news organization in an email.
Mr. Vasquez-Medina pointed out that the patients with MAFLD had a higher risk of mortality even after adjusting for age, sex, type 2 diabetes, hypertension, overweight, and obesity (BMI ≥ 30 kg/m2). MAFLD also was more strongly associated with a poor outcome than either hypertension alone or obesity alone. Only age emerged as a significant independent covariate in the study.
Dr. Loomba also questioned whether the regression model used in this study for liver steatosis was “fully reflective of NAFLD.”
The researchers identified liver steatosis with a diagnostic formula that used noninvasive clinical BMI and laboratory tests (alanine aminotransferase), citing a study that found the regression formula was better at diagnosing NAFLD than FibroScan.
Mr. Vázquez-Medina reported no relevant financial relationships. Dr. Loomba serves as a consultant to Aardvark Therapeutics, Altimmune, Anylam/Regeneron, Amgen, Arrowhead Pharmaceuticals, AstraZeneca, Bristol-Myers Squibb, CohBar, Eli Lilly, Galmed, Gilead, Glympse Bio, Hightide, Inipharma, Intercept, Inventiva, Ionis, Janssen, Madrigal, Metacrine, NGM Biopharmaceuticals, Novartis, Novo Nordisk, Merck, Pfizer, Sagimet, Theratechnologies, 89bio, Terns Pharmaceuticals, and Viking Therapeutics. He is co-founder of LipoNexus.
A version of this article first appeared on Medscape.com.