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Mitogenic activity in connection with coronary angioplasty

S R Johansson1, J Nilsson, A Hamsten

  • 1Division of Cardiology, Sahlgrenska Hospital, University of Göteborg, Sweden.

European Heart Journal
|July 1, 1993
PubMed

Insights

Plasma mitogenic activity significantly increases immediately after percutaneous transluminal coronary angioplasty (PTCA). However, this acute rise in mitogenic activity does not correlate with the development of restenosis following the procedure.

Area of Science:

  • Cardiovascular Research
  • Vascular Biology
  • Interventional Cardiology

Background:

  • Percutaneous transluminal coronary angioplasty (PTCA) is a common procedure to treat coronary artery disease.
  • Restenosis, the re-narrowing of a blood vessel after angioplasty, remains a significant clinical challenge.
  • Plasma mitogenic activity, a marker of cellular proliferation, has been investigated for its role in vascular healing and restenosis.

Purpose of the Study:

  • To investigate the temporal changes in plasma mitogenic activity following PTCA.
  • To determine the relationship between post-PTCA plasma mitogenic activity and the occurrence of restenosis.
  • To compare plasma mitogenic activity in patients undergoing PTCA versus those undergoing diagnostic coronary angiography.

Main Methods:

  • Plasma samples were collected from 50 patients before and at multiple time points after elective PTCA (1h, 24h, 2 weeks, 6 months).
  • Mitogenic activity was assessed by measuring the incorporation of 3H-thymidine into arterial smooth muscle cells incubated with patient plasma.
  • Follow-up coronary angiography was performed to assess for restenosis at 6 months or earlier if clinically indicated. A control group of 17 patients underwent angiography without PTCA.

Main Results:

  • Plasma mitogenic activity was significantly elevated 1 hour after PTCA compared to pre-procedure levels (53.1 +/- 7.4 vs 26.8 +/- 7.3, P < 0.001).
  • Mitogenic activity returned to baseline levels by 24 hours and remained unchanged at later time points.
  • No significant increase in mitogenic activity was observed in patients undergoing coronary angiography without PTCA.
  • There was no significant difference in plasma mitogenic activity between patients who developed restenosis (n=19) and those who did not (n=31).

Conclusions:

  • Plasma mitogenic activity shows a transient, acute increase immediately following PTCA.
  • This immediate post-procedural surge in mitogenic activity is not associated with the development of restenosis.
  • The findings suggest that factors other than this acute mitogenic response are likely responsible for restenosis after PTCA.

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