Predictors of poorly developed coronary collateral circulation in patients with subclinical hypothyroidism suffered from chronic stable angina

Authors

  • Mohamed Khalfallah Department of Cardiovascular Medicine, Faculty of Medicine, Tanta University, Tanta, Egypt
  • Enas Draz Department of Cardiovascular Medicine, Faculty of Medicine, Tanta University, Tanta, Egypt
  • Khaled Shalaby Department of Internal Medicine, Faculty of Medicine, Tanta University, Tanta, Egypt
  • Yasser Mostafa Hafez Department of Internal Medicine, Faculty of Medicine, Tanta University, Tanta, Egypt

DOI:

https://doi.org/10.21542/gcsp.2019.10

Abstract

Background: The development of coronary collaterals is variable among patients with coronary artery disease and remains incompletely understood. We aimed to demonstrate the predictors of poorly developed coronary collateral circulation (CCC) in patients with subclinical hypothyroidism suffered from chronic stable angina.

Methods: The study was conducted on 226 patients with subclinical hypothyroidism suffered from chronic stable angina, coronary angiography documented total occlusion at any major coronary artery or coronary artery lumen diameter stenosis ˃90%. Patients were divided into two groups according to grade of CCC, group A: 138 patients with (good collaterals) and group B: 88 patients with (poor collaterals). To classify CCC, we used Rentrop’s classification.

Results: Multivariate regression analysis was performed and identified the independent predictors of poor coronary collaterals: N/L ratio (OR 0.413, CI95% 0.172–0.993, p=0.048), and TSH (OR 2.511, CI95% 1.784– 3.534, p=0.001). The ROC analysis provided a cut-off value of >4.6 for N/L ratio, and >9 μIU/mL for TSH to predict poor coronary collaterals.

Conclusion: An elevated level of N/L ratio ˃ 4.6 and TSH level ˃ 9 μIU/mL were the independent predictors of poorly developed CCC in patients with subclinical hypothyroidism suffered from chronic stable angina.

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Published

2019-05-24

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Section

Research articles