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Enhanced inflammatory response to coronary angioplasty in patients with severe unstable angina
G Liuzzo1, A Buffon, L M Biasucci
1Istituto di Cardiologia, Universitá Cattolica, Roma, Italy.
Insights
Unstable angina patients show increased inflammatory markers like C-reactive protein (CRP) and interleukin-6 (IL-6) after procedures. Elevated baseline levels indicate a hyperresponsive inflammatory system, suggesting inflammation
Area of Science:
- Cardiology
- Inflammation Research
- Biomarker Analysis
Background:
- Systemic inflammation is observed in unstable angina.
- Plaque disruption may heighten inflammatory response in unstable angina compared to stable angina.
- Acute-phase proteins like CRP, SAA, and IL-6 are key inflammatory markers.
Purpose of the Study:
- To assess the time course of CRP, SAA, and IL-6 following percutaneous transluminal coronary angioplasty (PTCA) and coronary angiography.
- To compare inflammatory marker changes in stable versus unstable angina patients.
- To investigate the role of baseline inflammatory levels in response to procedures.
Main Methods:
- Blood samples collected pre- and post-PTCA/angiography at multiple time points (6, 24, 48, 72 hours).
- Analysis of C-reactive protein (CRP), serum amyloid A protein (SAA), and interleukin-6 (IL-6) levels.
- Study included patients with stable and unstable angina undergoing PTCA (protocol A) or diagnostic angiography (protocol B).
Main Results:
- In protocol A, CRP, SAA, and IL-6 increased significantly in unstable angina patients with elevated baseline levels post-PTCA (P<0.001).
- In protocol B, these markers increased in unstable angina patients post-angiography (P<0.05), but not in stable angina patients.
- Baseline CRP and SAA levels strongly correlated with peak post-procedure values (P<0.001).
Conclusions:
- Plaque rupture alone does not fully explain acute-phase protein elevation in unstable angina.
- Elevated baseline acute-phase proteins signify a hyperresponsive inflammatory system to minor stimuli.
- An enhanced inflammatory response to non-specific stimuli may contribute to unstable angina pathogenesis.
Background:
Systemic markers of inflammation have been found in unstable angina. Disruption of culprit coronary stenoses may cause a greater inflammatory response in patients with unstable than those with stable angina. We assessed the time course of C-reactive protein (CRP), serum amyloid A protein (SAA), and interleukin-6 (IL-6) after single-vessel PTCA in 30 patients with stable and 56 patients with unstable angina (protocol A). We also studied 12 patients with stable and 15 with unstable angina after diagnostic coronary angiography (protocol B).
Methods And Results:
Peripheral blood samples were taken before and 6, 24, 48, and 72 hours after PTCA or angiography. In protocol A, baseline CRP, SAA, and IL-6 levels were normal in 87% of stable and 29% of unstable patients. After PTCA, CRP, SAA, and IL-6 did not change in stable patients and unstable patients with normal baseline levels but increased in unstable patients with raised baseline levels (all P<0.001). In protocol B, CRP, SAA, and IL-6 did not change in stable angina patients after angiography but increased in unstable angina patients (all P<0.05). Baseline CRP and SAA levels correlated with their peak values after PTCA and angiography (all P<0.001).
Conclusions:
Our data suggest that plaque rupture per se is not the main cause of the acute-phase protein increase in unstable angina and that increased baseline levels of acute-phase proteins are a marker of the hyperresponsiveness of the inflammatory system even to small stimuli. Thus, an enhanced inflammatory response to nonspecific stimuli may be involved in the pathogenesis of unstable angina.