Variability of platelet aggregation in patients with clopidogrel treatment and hip fracture: A retrospective case-control study on 112 patients

Figure 1 Schematic illustration of multiple electrode aggregometry. A: Whole blood sample is put in a twin impedance sensor; B: Addition of a platelet agonist activates platelets to adhere to the electrodes; C: When platelets adhere to electrodes there will be an increase in electrical resistance between electrodes. Electrical resistance is measured as a value of platelet activity. Platelets affected by clopidogrel treatment adhere less to electrodes.

Figure 2 Flow of patients in the study.