Related Experiment Video
Updated: Jan 31, 2026
Microfluidics in Assessing Platelet Function
Published on: November 8, 2024
Postoperative platelet function is associated with severe bleeding in ticagrelor-treated patients
Erik Björklund1,2, Emma C Hansson2,3, Birgitta S Romlin4
1Department of Internal Medicine, Södra Älvsborg Hospital, Borås, Sweden.
Insights
Postoperative platelet function testing can predict severe bleeding in cardiac surgery patients, similar to preoperative testing. However, individual patient predictability remains limited despite correlations between pre- and post-operative function.
Area of Science:
- Cardiovascular Medicine
- Hematology
- Surgical Research
Background:
- Preoperative platelet function testing is established for predicting bleeding risk in cardiac surgery patients on dual antiplatelet therapy.
- The utility of postoperative platelet function testing, considering both pre- and perioperative influences, has not been previously evaluated.
Purpose of the Study:
- To evaluate the association between postoperative platelet function and severe bleeding in cardiac surgery patients.
- To compare the predictive value of postoperative versus preoperative platelet function testing for bleeding risk.
Main Methods:
- A prospective observational study included 74 patients with acute coronary syndrome treated with aspirin and ticagrelor before cardiac surgery.
- Platelet aggregation was measured using multiple electrode impedance aggregometry before surgery and 2 hours after cardiopulmonary bypass.
- Receiver operating characteristic curves analyzed the association between platelet aggregation and severe bleeding.
Main Results:
- Severe bleeding occurred in 34% of patients. Both preoperative and postoperative adenosine diphosphate-induced platelet aggregation showed comparable predictive accuracy for bleeding (AUC ~0.75-0.77).
- Postoperative aggregation induced by arachidonic acid and thrombin receptor-activating peptide had lower predictive value.
- Significant correlations were found between pre- and postoperative platelet aggregation, but with substantial interindividual variability.
Conclusions:
- Postoperative platelet function testing is a viable predictor of severe bleeding, with accuracy comparable to preoperative testing.
- While a correlation exists between pre- and postoperative platelet function, its predictability for individual patients is limited.
Objectives:
Preoperative testing of platelet function predicts bleeding risk in cardiac surgery patients treated with dual antiplatelet therapy, but the value of postoperative platelet function testing, reflecting both preoperative antiplatelet therapy and perioperative changes in platelet function, has not been evaluated.
Methods:
Seventy-four patients with acute coronary syndrome treated with acetylsalicylic acid and ticagrelor within 5 days before cardiac surgery were included in a prospective observational study. Platelet aggregation induced by adenosine diphosphate, arachidonic acid and thrombin receptor-activating peptide was assessed with multiple electrode impedance aggregometry immediately before surgery and 2 h after weaning off cardiopulmonary bypass. Receiver operating characteristic curves were used to determine any association between platelet aggregation and severe bleeding according to the universal definition of perioperative bleeding in adult cardiac surgery.
Results:
Severe bleeding occurred in 25 of 74 patients (34%). Preoperative and postoperative adenosine diphosphate-induced platelet aggregations were associated with bleeding, with comparable areas under the receiver operating characteristic curve [0.77 (95% confidence interval 0.65-0.89) vs 0.75 (0.62-0.87)]. Postoperative arachidonic acid- and thrombin receptor-activating peptide-induced aggregation had markedly smaller areas under the curve. There were significant correlations between preoperative and postoperative platelet aggregation induced by adenosine diphosphate (r2 = 0.77, P < 0.001), arachidonic acid (r2 = 0.24, P < 0.001) and thrombin receptor-activating peptide (r2 = 0.21, P < 0.001) but with large interindividual variations.
Conclusions:
Poor postoperative platelet function was associated with severe bleeding, with accuracy comparable to that of preoperative platelet function. There was a correlation between preoperative and postoperative platelet function, but the predictability in an individual patient was limited.
Related Concept Videos
01:18Structure and Function of Platelets
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000...
01:22Bleeding in Fresh Concrete
Bleeding can cause several issues in the concrete structure. Sometimes, the rising water gets trapped beneath large aggregate...
01:22Formation of the Platelet Plug
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
01:23Peripheral Artery Disease V: Postoperative Nursing Management
02:45Functional Groups
02:45Functional Groups