title: Platelet dysfunction and inhibition of multiple electrode platelet aggregometry caused by penicillin.
abstract: Beta-lactam antibiotics, e.g. penicillin, may inhibit platelet function and lead to reduced response in light transmission aggregometry and adhesion. However, influence on platelet function tests more commonly used in clinical practice, such as multiple electrode platelet aggregometry (MEA), have not been described so far. We report a case of a patient with local streptococcus infection. Treatment with penicillin resulted in mild bleeding tendency after 3 days. While coagulation parameters were normal, assessment of platelet function by MEA revealed strong platelet inhibition of both ADP and arachidonic acid induced platelet aggregation comparable to normal responders to antiplatelet therapy. Change of antibiotic regime resulted in recovery of platelet function. Thus, penicillin therapy may impact on platelet function and consecutively commonly used platelet function assays, e.g. MEA.
authors.affiliation: Deutsches Herzzentrum and 1, Medizinische Klinik, Klinikum rechts der Isar, Technische Universität München, Munich, Germany. chrisschulz@mytum.de.
authors.forename: Christian
authors.initials: C
authors.lastname: Schulz
authors.forename: Olga
authors.initials: O
authors.lastname: von Beckerath
authors.forename: Rainer
authors.initials: R
authors.lastname: Okrojek
authors.forename: Nicolas
authors.initials: N
authors.lastname: von Beckerath
authors.forename: Steffen
authors.initials: S
authors.lastname: Massberg