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Histopathology and morphometry of radial artery conduits: basic study and clinical application
Ujjwal K Chowdhury1, Balram Airan, Pankaj K Mishra
1Department of Cardiothoracic, All India Institute of Medical Sciences, Ansari Nagar, New Delhi 110029, India. ujjwalchow@rediffmail.com
The Annals of Thoracic Surgery
|October 30, 2004
Summary
The distal radial artery shows more intimal hyperplasia and arteriosclerosis than the proximal part, especially in older smokers and hypertensive patients. Distal segments should be discarded during radial artery harvesting for myocardial revascularization.
Area of Science:
- Vascular Biology
- Cardiovascular Surgery
- Pathology
Background:
- The radial artery is a common conduit for myocardial revascularization.
- Intimal hyperplasia, calcification, and arteriosclerosis can affect radial artery graft patency.
- Understanding the distribution and risk factors of these pathologies is crucial for optimal graft selection.
Purpose of the Study:
- To investigate the histopathology, morphometry, and risk factors of intimal hyperplasia, calcification, and arteriosclerosis in radial arteries.
- To compare morphometric differences between distal and proximal radial artery segments.
Main Methods:
- Histopathologic and morphometric analysis of 190 proximal and distal radial artery specimens.
- Evaluation of disease severity using luminal narrowing percentage, intimal thickness index, and intima-to-media ratio.
- Multivariate logistic regression to identify predictors of intimal hyperplasia, calcification, and arteriosclerosis.
Main Results:
- Distal radial artery segments exhibited significantly higher rates of intimal hyperplasia (76.3%) and luminal narrowing compared to proximal segments (32.6% normal).
- Age >50 years, smoking, and hypertension were significant predictors of intimal hyperplasia.
- Smoking, diabetes, hypercholesterolemia, peripheral arterial disease, and chronic renal failure were associated with medial calcification and arteriosclerosis.
Conclusions:
- Preexisting intimal hyperplasia is common in radial artery conduits, predominantly in the distal portion.
- Distal segments of the radial artery are more diseased and should be discarded during harvesting.
- Careful patient selection is advised, avoiding radial artery use in elderly males, smokers, diabetics, hypertensives, and those with peripheral vascular disease.