Interleukin 6 expression in coronary circulation after coronary angioplasty as a risk factor for restenosis
1Department of Cardiology, Jichi Medical School, Minamikawachi-machi, Tochigi 329-0498, Japan.
Insights
Percutaneous transluminal coronary angioplasty (PTCA) increases interleukin-6 (IL-6) in the coronary circulation. Elevated IL-6 correlates with late restenosis, suggesting a role in post-procedure inflammation.
Area of Science:
- Cardiovascular Medicine
- Interventional Cardiology
- Inflammation Research
Background:
- Ischaemic heart disease necessitates interventions like PTCA.
- Restenosis remains a significant complication after PTCA.
- Understanding the inflammatory response post-PTCA is crucial for improving outcomes.
Purpose of the Study:
- To investigate changes in cytokine expression within the coronary circulation following PTCA.
- To determine the correlation between specific cytokines and late restenosis after PTCA.
Main Methods:
- 32 patients with ischaemic heart disease undergoing PTCA for left coronary artery stenosis were studied.
- Blood samples were collected from the coronary sinus pre- and post-PTCA.
- Plasma levels of IL-6, PDGF, MCP-1, and M-CSF were measured; late loss index was assessed via angiography.
Main Results:
- Interleukin-6 (IL-6) concentrations significantly increased immediately after PTCA (p < 0.001).
- No significant changes were observed in PDGF, MCP-1, or M-CSF levels.
- Increased IL-6 post-PTCA correlated positively with late loss index (r = 0.73, p < 0.001) and was higher in patients with restenosis.
Conclusions:
- PTCA triggers IL-6 production in the coronary circulation.
- Elevated IL-6 may contribute to inflammatory responses and play a role in the development of late restenosis after PTCA.
Objective:
To investigate changes in cytokine expression in the coronary circulation induced by percutaneous transluminal coronary angioplasty (PTCA).
Methods:
The study involved 32 patients with ischaemic heart disease who underwent elective PTCA for isolated stenotic lesions of the left coronary artery. Ten patients had plain old balloon angioplasty, 10 had percutaneous transluminal rotational atherectomy, and 12 had stent implantation. Blood samples were drawn from the coronary sinus before and immediately after PTCA. Plasma concentrations of interleukin 6 (IL-6), platelet derived growth factor (PDGF), monocyte chemoattractant protein 1 (MCP-1), and macrophage coronary stimulating factor (M-CSF) were measured. The patients were scheduled for follow up angiography six months after PTCA. Late loss index was calculated using quantitative coronary angiography.
Results:
IL-6 concentrations in coronary sinus blood increased immediately after PTCA (p < 0.001), but there was no change in PDGF, MCP-1, or M-CSF. There was a positive correlation between changes in IL-6 concentrations immediately after PTCA and late loss index six months after PTCA (r = 0.73, p < 0.001). IL-6 concentrations in coronary sinus blood were higher in patients with late restenosis than in those without restenosis (p < 0.001).
Conclusions:
PTCA induces IL-6 production in the coronary circulation. This may induce subsequent inflammatory responses in injured vessels and play an important role in late restenosis after PTCA.
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