Am J Cardiol. 2020 Aug 27:S0002-9149(20)30898-5. doi: 10.1016/j.amjcard.2020.08.041. Online ahead of print.
This study aimed to determine if cardiac troponin I (cTnI) is an independent predictor of clinical outcomes and whether higher values are associated with worse clinical outcomes in Covid-19 patients. This case-series study was conducted at Phoebe Putney Health System. Participants were confirmed Covid-19 patients admitted to our health system between March 2, 2020 and June 7, 2020. Data were collected from electronic medical records. Patients were divided into 2 groups: with and without elevated cTnI. The cTnI were further divided in 4 tertiles. Multivariable logistic regression analysis was performed to adjust for demographics, baseline comorbidities, and laboratory parameters including D-dimer, ferritin, lactate dehydrogenase, procalcitonin and C-reactive protein. Out of 309 patients, 116 (37.5%) had elevated cTnI. Those with elevated cTnI were older (59.9 vs. 68.2 years, p<0.001), and more likely to be males (53.5% vs. 36.3%, p=0.003). Elevated cTnI group had higher baseline comorbidities. After multivariable adjustment, overall mortality was significantly higher in elevated cTnI group (37.9% v 11.4%, odds ratio:4.45; confidence interval:1.78-11.14, p<0.001). Need for intubation, dialysis, and intensive care unit (ICU) transfer was higher in elevated cTnI group. Among those with elevated cTnI, mortality was 23.2% for 50th percentile, 48.4% for 75th percentile, and 55.2% for 100th percentile. Similarly, further increase in cTnI was associated with a higher need for intubation, dialysis, and ICU transfer. In conclusion, myocardial injury occurs in significant proportion of hospitalized Covid-19 patients and is an independent predictor of clinical outcomes, with higher values associated with worse outcomes.