“The Circulation opinion piece states that clinicians often use troponin as a binary test for myocardial infarction and a mandate for downstream testing, suggesting clinicians will need to recalibrate that approach, something I agree with and which is the central message of the ACC position,” Januzzi said.
Probably the biggest difference between the two documents, he said, is in the Circulation authors’ apparent enthusiasm to use hs-cTn as a tool to judge disease severity in patients with COVID-19.
It’s been known for more than a decade that myocardial injury is “an important risk predictor” in critical illness, Januzzi explained. “So the link between cardiac injury and outcomes in critical illness is nothing new. The difference is the fact we are seeing so many patients with COVID-19 all at once, and the authors suggest that using troponin might help in triage decision making.”
“There may be [such] a role here, but the data have not been systematically collected, and whether troponin truly adds something beyond information already available at the bedside — for example, does it add anything not already obvious at the bedside? — has not yet been conclusively proven,” Januzzi cautioned.
“As well, there are no prospective data supporting troponin as a trigger for ICU triage or for deciding on specific treatments.”
Positive cTn status “common” in COVID-19 patients
In his experience, Barry Cohen, MD, Morristown Medical Center, New Jersey, told theheart.org | Medscape Cardiology, that positive cTn status is “common in COVID-19 patients and appears to have prognostic value, not only in type 1 MI due to atherothrombotic disease (related to a proinflammatory and prothrombotic state), but more frequently type 2 MI (supply–demand mismatch), viral myocarditis, coronary microvascular ischemia, stress cardiomyopathy or tachyarrhythmias.”
Moreover, Cohen said, hs-cTn “has identified patients at increased risk for ventilation support (invasive and noninvasive), acute respiratory distress syndrome, acute kidney injury, and mortality.”
Echoing both the ACC document and the Circulation report, Cohen also said hs-cTn measurements “appear to help risk stratify COVID-19 patients, but clearly do not mean that a troponin-positive patient needs to go to the cath lab and be treated as having acute coronary syndrome. Only a minority of these patients require this intervention.”
Mills discloses receiving honoraria from Abbott Diagnostics, Roche Diagnostics, Siemens Healthineers, and LumiraDx. Januzzi has previously disclosed receiving personal fees from the American College of Cardiology, Pfizer, Merck, AbbVie, Amgen, Boehringer Ingelheim, and Takeda; grants and personal fees from Novartis, Roche, Abbott, and Janssen; and grants from Singulex and Prevencio. Cohen has disclosed no relevant financial relationships.
This article first appeared on Medscape.com.