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Biomarkers of Thrombotic Status Predict Spontaneous Reperfusion in Patients With ST-Segment Elevation
Rahim Kanji1, Ying X Gue2, Vassilios Memtsas1
1Faculty of Medicine, National Heart and Lung Institute, Imperial College, London, United Kingdom; Cardiology Department, East and North Hertfordshire NHS Trust, Stevenage, Hertfordshire, United Kingdom.
Insights
Spontaneous reperfusion in ST-elevation myocardial infarction (STEMI) is linked to a unique blood profile, including reduced platelet activity and quicker clot breakdown. This finding suggests potential for early interventions to improve patient outcomes.
Area of Science:
- Cardiology
- Hematology
- Thrombosis Research
Background:
- Spontaneous reperfusion occurs in approximately 20% of ST-elevation myocardial infarction (STEMI) patients before intervention.
- The underlying mechanisms driving spontaneous reperfusion remain largely unknown.
Purpose of the Study:
- To investigate the relationship between the thrombotic profile and spontaneous reperfusion in STEMI patients.
- To identify hematological factors associated with spontaneous reperfusion and its impact on clinical outcomes.
Main Methods:
- A prospective study involving 801 STEMI patients.
- In vitro assessment of blood occlusion times (OT) and endogenous lysis times (LT) pre-percutaneous coronary intervention (PCI).
- Definition of spontaneous reperfusion as Thrombolysis In Myocardial Infarction (TIMI) flow grade 3 in the infarct-related artery before PCI.
- Follow-up for major adverse cardiovascular events over four years.
Main Results:
- Spontaneous reperfusion was associated with longer OT and shorter LT, lower troponin levels, and better left ventricular function.
- Endogenous lysis time (LT) was a superior predictor of spontaneous reperfusion compared to occlusion time (OT).
- Patients with spontaneous reperfusion experienced significantly fewer major adverse cardiovascular events (4.1% vs 10.6%) over four years.
Conclusions:
- A distinct hematological signature, characterized by decreased platelet reactivity and accelerated endogenous fibrinolysis, is associated with spontaneous reperfusion in STEMI.
- These findings suggest that modulating thrombotic status early in STEMI could facilitate spontaneous reperfusion and improve patient prognosis.
Background:
Spontaneous reperfusion, seen in ∼20% of patients with ST-segment elevation myocardial infarction (STEMI), manifests as normal epicardial flow in the infarct-related artery, with or without ST-segment resolution, before percutaneous coronary intervention (PCI). The drivers mediating this are unknown.
Objectives:
The authors sought to relate spontaneous reperfusion to the thrombotic profile.
Methods:
In a prospective study, blood from STEMI patients (n = 801) was tested pre-PCI to assess in vitro, point-of-care, occlusion times (OT) and endogenous lysis times (LT). Spontaneous reperfusion was defined as infarct-related artery Thrombolysis In Myocardial Infarction flow grade 3 before PCI. Patients were followed for major cardiovascular events (death, myocardial infarction, or stroke).
Results:
Spontaneous reperfusion was associated with a longer OT (435 seconds vs 366 seconds; P < 0.001) and a shorter LT (1,257 seconds vs 1,616 seconds; P < 0.001), lower troponin, and better left ventricular function. LT was superior to OT for predicting spontaneous reperfusion (area under the curve for LT: 0.707; 95% CI: 0.661-0.753; area under the curve for OT: 0.629; 95% CI: 0.581-0.677). Among patients with spontaneous reperfusion, those with complete, vs partial ST-segment resolution, had a longer OT (P = 0.002) and a shorter LT (P < 0.001). Spontaneous reperfusion was unrelated to clinical characteristics or pain-to-angiography times. Over 4 years, patients with spontaneous reperfusion experienced fewer major adverse cardiovascular events than those without (4.1% vs 10.6%; P = 0.013), especially in those with both spontaneous reperfusion and complete ST-segment resolution (1.5% vs 10.1%; P = 0.029).
Conclusions:
We demonstrate a novel hematological signature in STEMI patients with spontaneous reperfusion, namely, decreased platelet reactivity and faster endogenous fibrinolysis, relating to smaller infarcts and improved survival. This finding indicates a role for modulating thrombotic status early after STEMI onset, to facilitate spontaneous reperfusion and improve outcomes.
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