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Obstruction in modified Blalock shunts: a quantitative analysis with clinical correlation.
Winfield J Wells1, R James Yu, Anjan S Batra
1Childrens Hospital Los Angeles, Los Angeles, California 90027, USA. wwells@chla.usc.edu
The Annals of Thoracic Surgery
|May 28, 2005
Summary
Most modified Blalock-Taussig shunts (MBTS) develop significant stenosis by takedown, with smaller shunt size being a key risk factor. Understanding these factors can help improve outcomes for patients with congenital heart disease.
Area of Science:
- Cardiovascular Surgery
- Pediatric Cardiology
- Histopathology
Background:
- Limited data exists on the obstruction of modified Blalock-Taussig shunts (MBTS).
- No studies have histopathologically quantified MBTS stenosis and correlated it with clinical risk factors.
Purpose of the Study:
- To histopathologically analyze MBTS stenosis.
- To correlate stenosis with demographic and clinical risk factors.
Main Methods:
- 155 patients undergoing MBTS takedown were analyzed.
- Shunts were excised and histopathologically examined for maximal narrowing.
- Demographic and clinical variables were tested for correlation with stenosis.
Main Results:
- Mean maximal narrowing was 34%; 21% of shunts had >50% stenosis.
- Myofibroblastic proliferation with thrombus caused obstruction.
- Smaller shunt size (<4 mm) was a significant risk factor for >50% stenosis (OR=2.51, p=0.028).
Conclusions:
- Most MBTS develop stenosis, with 21% experiencing significant obstruction.
- Shunt size <4 mm is a risk factor for high-grade stenosis.
- Younger age, cardiopulmonary bypass, and platelet use are clinically important factors.