Plasma viscosity is elevated in adult males with acute myocardial infarction, regardless of severity, according to a 2013 study by Kul et al. The study evaluated various blood flow parameters between 3 groups, acute myocardial infarction with ST-segment elevation (n = 22), acute myocardial infarction without ST-segment elevation, and age-matched apparently healthy males (n = 20). While heart attacks with electrocardiogram findings of ST-segment elevation (STEMI) tend to be more severe and result in more widespread tissue damage than non-ST segment elevation (NSTEMI), plasma viscosity was not significantly different between the groups. Plasma viscosity was, however, significantly elevated in all patients with acute myocardial infarction when compared with apparently healthy controls. Whole blood viscosity showed only a statistically insignificant increase among groups of varying heart attack severity, despite previous larger studies showing a significant relationship.