Elevations in troponin I after percutaneous coronary interventions are associated with abnormal tissue-level
Leonardo Bolognese1, Kenneth Ducci, Paolo Angioli
1Division of Cardiology, S. Donato Hospital, Via P. Nenni n. 22, 52100 Arezzo, Italy. leonardobolognese@hotmail.com
Insights
Post-procedure cardiac troponin I elevation in non-ST-segment-elevation acute coronary syndromes (NSTE-ACS) is linked to poor tissue perfusion after percutaneous coronary intervention (PCI). This indicates impaired myocardial blood flow and highlights potential complications following PCI in high-risk patients.
Area of Science:
- Cardiology
- Interventional Cardiology
- Biomarkers
Background:
- Mechanisms of cardiac troponin I (cTnI) elevation post-percutaneous coronary intervention (PCI) in non-ST-segment-elevation acute coronary syndromes (NSTE-ACS) are not fully understood.
- NSTE-ACS patients often undergo PCI, and elevated cTnI can complicate outcomes.
- Understanding predictors of cTnI elevation is crucial for risk stratification.
Purpose of the Study:
- To investigate the association between post-PCI cardiac troponin I (cTnI) elevation and tissue-level myocardial perfusion in high-risk NSTE-ACS patients.
- To correlate cTnI levels with quantitative measures of myocardial perfusion.
- To identify potential pathophysiological links between cTnI release and impaired coronary blood flow.
Main Methods:
- A cohort of 42 high-risk NSTE-ACS patients undergoing PCI within 48 hours of admission were studied.
- Tissue-level perfusion was assessed using TIMI flow grade, corrected TIMI frame count, TIMI myocardial perfusion grade (TMPG), and myocardial contrast echocardiography (MCE).
- Measurements were taken before and immediately after PCI, with patients receiving glycoprotein IIb/IIIa inhibitors.
Main Results:
- Fourteen patients experienced post-PCI cTnI elevation, while 28 did not.
- Abnormal myocardial perfusion (TMPG 0/1) was significantly more frequent in patients with cTnI elevation (43% vs. 7%, P<0.02).
- Patients with elevated cTnI showed lower myocardial perfusion (TMPG 0/1 vs. 2/3, P<0.0001) and reduced perfused segments on MCE (P=0.02).
Conclusions:
- Postprocedural cTnI elevation in high-risk NSTE-ACS patients is significantly associated with abnormal tissue-level myocardial perfusion.
- Impaired myocardial perfusion post-PCI may contribute to cTnI release in this patient population.
- These findings suggest that perfusion assessment is critical in understanding cTnI elevation after PCI.
Background:
In the setting of non-ST-segment-elevation (NSTE) acute coronary syndromes (ACS), the pathophysiological mechanisms underlying post-percutaneous coronary intervention (PCI) cardiac troponin I (cTnI) elevation remain unclear.
Methods And Results:
We evaluated the relationship between troponin elevation and tissue-level perfusion using the TIMI flow grade, corrected TIMI frame count, TIMI myocardial perfusion grade (TMPG), and myocardial contrast enhancement by intracoronary myocardial contrast echocardiography (MCE) before and immediately after PCI performed within 24 to 48 hours of hospital admission in 42 high-risk (angina at rest, unequivocal ST-segment depression, and cTnI elevation) patients with NSTE-ACS. All patients were treated with glycoprotein IIb/IIIa inhibitors (27 with tirofiban and 15 with abciximab) and had successful PCI. Fourteen patients had a postprocedural cTnI elevation, whereas 28 did not. TMPG 0/1 after PCI was observed more frequently in patients with postprocedural cTnI elevation (43% versus 7%; P<0.02). cTnI levels were higher among patients with TMPG 0/1 versus patients with TMPG 2/3 (5.3+/-2.7 versus 1.5+/-1.3 ng/mL; P<0.0001). Patients with postprocedural cTnI elevation also presented a significantly lower number of perfused segments at MCE (59% versus 81%; P=0.02) as well as a lower MCE score index (0.65+/-0.38 versus 0.89+/-0.21; P<0.02).
Conclusions:
Postprocedural cTnI elevation in high-risk patients with NSTE-ACS is associated with an abnormal tissue-level perfusion.
Related Concept Videos
01:20Blood Studies for Cardiovascular System I: Cardiac Biomarkers
The essential diagnostic tools for detecting myocardial necrosis and monitoring individuals suspected of having acute coronary syndrome (ACS) include:
Troponins
Troponins, particularly cardiac troponins I and T, are the most precise and sensitive markers of myocardial injury. They are detectable within 4-6 hours of myocardial injury and remain...
01:30Acute Coronary Syndrome I: Introduction
01:19Acute Coronary Syndrome II: Pathophysiology and Clinical Manifestations
01:30Acute Coronary Syndrome III: Diagnostic Studies
01:28Acute Coronary Syndrome IV: Interprofessional Care
01:26Acute Coronary Syndrome V: Nursing Management