Heparin Influences Human Platelet Behavior in Cardiac Surgery With or Without Cardiopulmonary Bypass

Q: What are the key findings of this study?

Cardiopulmonary bypass and non-CPB surgery caused similar platelet count reductions (e.g., 230 to 182 after sternotomy in CPB, P<0.05), showing hemodilution and heparin drive platelet dysfunction.

Q: What is the clinical evidence from this study?

Study design: Observational. Population: Cardiac surgery (n=40). Intervention: Cardiopulmonary bypass (CPB) vs. Without cardiopulmonary bypass (non-CPB). Primary outcome: Platelet count and platelet aggregation function (p=<0.05).

Q: What does this research mean for the field?

Platelet reduction and dysfunction during cardiac surgery occur similarly with or without cardiopulmonary bypass and are predominantly driven by hemodilution and heparin administration rather than bypass-induced shear stress. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

Q: What question did this study set out to answer?

To determine whether platelet dysfunction in cardiac surgery is caused by hemodilution or mechanical shear stress from cardiopulmonary bypass.

Steven Laga; Hilde Bollen; Jef Arnout; Marc Hoylaerts; Bart Meyns

doi:10.1111/j.1525-1594.2005.29090.x

June 24, 2005Artificial Organs

Heparin Influences Human Platelet Behavior in Cardiac Surgery With or Without Cardiopulmonary Bypass

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Key result

CPB shows similar platelet reductions to non-CPB surgery, driven by hemodilution and heparin.

P<0.05
n=40

Why the study?

It was unclear whether platelet dysfunction in cardiac surgery is caused by hemodilution or shear stress due to cardiopulmonary bypass.

Does cardiopulmonary bypass compared to no cardiopulmonary bypass affect platelet count and function in patients undergoing cardiac surgery?

Key Points

To determine whether platelet dysfunction in cardiac surgery is caused by hemodilution or mechanical shear stress from cardiopulmonary bypass.
Prospective cohort analysis of patients undergoing cardiac surgery with or without cardiopulmonary bypass (CPB; total N = 40).
Assessed platelet counts at seven perioperative time points in a subcohort (n = 20; 10 CPB vs. 10 non-CPB).
Evaluated platelet aggregometry using ADP, arachidonic acid (AA), and collagen across stages of surgery, including after heparin administration (n = 20; 10 CPB vs. 10 non-CPB).
In the CPB group, platelet counts decreased significantly after sternotomy (230 ± 34 vs. 182 ± 25, P < 0.05) with a nadir at postoperative day 1 (96 ± 34, P < 0.05), showing a similar decline in the non-CPB group.
In the CPB group, platelet aggregation dropped significantly post-heparin compared to surgical induction for ADP (54 ± 13% vs. 38 ± 9%, P < 0.05), AA (76 ± 16% vs. 22 ± 14%, P < 0.05), and collagen (66 ± 13% vs. 37 ± 11%, P < 0.05).
In the non-CPB group, AA-induced platelet aggregation also decreased significantly post-heparin compared to baseline (83 ± 4% vs. 44 ± 14%, P < 0.05).

Study Design

Type

Observational (n=40)

Structured PICO

Does cardiopulmonary bypass compared to no cardiopulmonary bypass affect platelet count and function in patients undergoing cardiac surgery?

P

Population

40 patients undergoing cardiac surgery either with or without cardiopulmonary bypass, prospectively analyzed for platelet count and function.

E

Exposure

Cardiac surgery with cardiopulmonary bypass (CPB)

C

Comparator

Cardiac surgery without cardiopulmonary bypass

O

Outcome

Platelet count and platelet function (aggregometry) at different points during surgery and postoperativelysurrogate

Main Result

p-value: p=<0.05

Platelet dysfunction and count reduction after cardiac surgery are primarily due to hemodilution and heparin administration, rather than cardiopulmonary bypass-induced shear stress.

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Implication

May not warrant CPB-specific platelet interventions; leaves open confirmation that hemodilution and heparin are primary drivers.

Abstract

The objective was to investigate whether the platelet dysfunction in cardiac surgery is caused by hemodilution or by shear stress due to cardiopulmonary bypass (CPB). Platelet count and function were prospectively analyzed in two groups of patients undergoing cardiac surgery either with or without CPB (n = 40). In the first study (n = 20; 10 patients with and 10 without CPB), platelet counts were assessed at seven time points. In the second study (n = 20; 10 patients with and 10 without CPB), platelet function was studied with platelet aggregometry at different points during surgery: (a) after induction of anesthesia; (b) after sternotomy; and (c) 1 h after heparin. In the first study, the CPB group showed a significant decrease in platelet count starting after sternotomy (230 +/- 34 vs. 182 +/- 25, P < 0.05) and a maximum decrease at day 1 postoperative (96 +/- 34, P < 0.05). A similar observation was made in the non-CBP group. In the second study, a significant decrease of ADP (54 +/- 13% vs. 38 +/- 9%, P < 0.05), AA (76 +/- 16% vs. 22 +/- 14%, P < 0.05), and Collagen (66 +/- 13% vs. 37 +/- 11%, P < 0.05) induced platelet aggregation was observed at MOMENT d compared to the beginning of surgery in the CPB group. In the non-CBP group a significant decrease was observed in AA-induced platelet aggregation at MOMENT d (83% +/- 4 vs. 44% +/- 14, P < 0.05). The reduction in platelet count is similar with or without cardiopulmonary bypass and is due to pure hemodilution. Platelet function reduces significantly after heparin administration. Hemodilution and predominantly heparin are the causes of platelet dysfunction after cardiac surgery.

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Cite This Study

Laga et al. (2005) conducted an observational in Cardiac surgery (n=40). Cardiopulmonary bypass (CPB) vs. Without cardiopulmonary bypass (non-CPB) was evaluated on Platelet count and platelet aggregation function (p=<0.05). Cardiopulmonary bypass and non-CPB surgery caused similar platelet count reductions (e.g., 230 to 182 after sternotomy in CPB, P<0.05), showing hemodilution and heparin drive platelet dysfunction.

synapsesocial.com/papers/6aac98f907a2a0a6b6f9e50f https://doi.org/10.1111/j.1525-1594.2005.29090.x

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Heparin Influences Human Platelet Behavior in Cardiac Surgery With or Without Cardiopulmonary Bypass

Key Points

Study Design

Structured PICO

Main Result

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

Heparin Influences Human Platelet Behavior in Cardiac Surgery With or Without Cardiopulmonary Bypass

Key Points

Study Design

Structured PICO

Main Result

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

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