Document Detail

Value of navigator echo magnetic resonance angiography in detecting occlusion/patency of arterial and venous, single and sequential coronary bypass grafts.
MedLine Citation:
PMID:  11144768     Owner:  NLM     Status:  MEDLINE    
Aim of our work was to validate magnetic resonance angiography (MRA) in detecting occlusion/patency of coronary artery bypass grafts. Twenty patients with previous history of bypass surgery and recurrent episodes of chest pain were enrolled. Two patients could not be studied (claustrophobia, erratic breathing). Thus, 18 patients with 51 bypasses were examined using a navigator echo sequence: 21 arterial grafts (six sequential) and 30 saphenous vein grafts (five sequential). All patients had undergone contrast conventional angiography 3-15 days before MRA. The magnetic resonance (MR) data set was analyzed by two independent readers blinded to the results of conventional angiography (occlusion of 12 of 51 grafts). At magnetic resonance, two bypasses of the posterior descending artery, patent at conventional angiography, could not be visualized because of imaging slab malpositioning. Interobserver concordance was 96% (47/49). Magnetic resonance and conventional angiography provided identical answers in 47 out of 49 (96%) of the examined grafts. Eleven out of 12 occluded grafts and 36 out of 37 patent grafts were correctly identified with MR. As far as occlusion is concerned, the sensitivity of MR was 91%, the specificity 97%. To summarize, a 30 min outpatient MR examination is highly reliable in determining occlusion/patency of arterial and venous, single and sequential bypasses.
G Molinari; F Sardanelli; F Zandrino; M Balbi; M A Masperone
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Publication Detail:
Type:  Journal Article; Validation Studies    
Journal Detail:
Title:  International journal of cardiac imaging     Volume:  16     ISSN:  0167-9899     ISO Abbreviation:  Int J Card Imaging     Publication Date:  2000 Jun 
Date Detail:
Created Date:  2000-12-28     Completed Date:  2001-02-15     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8600426     Medline TA:  Int J Card Imaging     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  149-60     Citation Subset:  IM    
Departments of Cardiology, University of Genoa School of Medicine, San Martino Hospital, Italy.
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MeSH Terms
Coronary Angiography
Coronary Artery Bypass*
Coronary Vessels / pathology*
Graft Occlusion, Vascular / radiography*
Magnetic Resonance Angiography*
Middle Aged
Vascular Patency

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