Percutaneous Coronary Intervention for Chronic Total Occlusion versus Percutaneous Coronary Intervention for...

Area of Science:

• Cardiology
• Endocrinology
• Radiology

Background:

• Iodinated contrast media used in percutaneous coronary intervention (PCI) can impact thyroid function.
• Chronic total occlusion (CTO) PCI often requires higher contrast volumes than non-complex PCI.
• The effect of contrast-induced iodide load on thyroid function post-PCI, particularly in CTO cases, requires further investigation.

Purpose of the Study:

• To compare the incidence of thyroid dysfunction after PCI for CTO versus non-complex coronary lesions.
• To assess whether higher iodide administration during CTO PCI influences thyroid function differently.
• To evaluate the risk of developing overt hyperthyroidism in patients with pre-existing subclinical hyperthyroidism undergoing CTO PCI.

Main Methods:

• A prospective study involving 615 patients undergoing elective PCI.
• Group I: 205 patients with CTO lesions. Group II: 410 patients with non-complex lesions.
• Thyroid function was monitored for 1-6 months post-PCI, comparing subclinical and overt hyperthyroidism development.

Main Results:

• Higher contrast volumes were administered in the CTO group (255 mL) compared to the non-complex group (80 mL).
• No significant difference in subclinical hyperthyroidism development was observed between groups (5.4% vs 5%).
• A significantly higher rate of overt hyperthyroidism developed in CTO patients with baseline subclinical hyperthyroidism (50%) compared to non-complex PCI patients (12%).

Conclusions:

• PCI for coronary CTO lesions does not elevate the risk of subclinical hyperthyroidism in euthyroid patients.
• In patients with subclinical hyperthyroidism, PCI for CTO significantly increases the risk of developing overt hyperthyroidism compared to non-complex PCI.
• Careful thyroid function monitoring is recommended post-PCI for CTO, especially in patients with pre-existing thyroid conditions.