Document Detail


Comparison of combination of dipyridamole and dobutamine during echocardiography with thallium scintigraphy with thallium scintigraphy to improve viability detection.
MedLine Citation:
PMID:  10073776     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The aim of this study was to investigate the relation between radioisotopic and echocardiographic markers of myocardial viability and their correlation with functional recovery after coronary revascularization. Myocardial viability can be detected by techniques exploring various aspects of cell physiology: thallium-201 scintigraphy and dobutamine and dipyridamole echocardiography focus on cell membrane integrity, beta-1 and adrenoceptor, and A2-adenosine receptor-mediated inotropic response, respectively. Fifty-seven patients (mean age 60+/-8 years) with previous myocardial infarction (>3 months), angiographically assessed coronary artery disease, and resting regional dysfunction underwent rest-redistribution 201-thallium scintigraphy and low-dose pharmacologic stress echo with dobutamine (up to 10 microg/kg/min), very low dose regimen of dipyridamole (0.28 mg/kg over 4 minutes), and combined dipyridamole-dobutamine. Criteria for viability in a 13-segment model for both techniques were percent peak activity in redistribution images >55% for thallium-201 and a decrease in wall motion score >1 grade (1 [normal] to 4 [dyskinetic]) for stress echo. Thirty patients underwent coronary revascularization (bypass surgery in 8, angioplasty in 22) and were followed up at 4 weeks from intervention with a resting echocardiogram. The rate of agreement between thallium-201 and stress echo was 63% for dipyridamole, 66% for dobutamine, and 74% for combined dipyridamole-dobutamine (p <0.05 vs dipyridamole and dobutamine). In the 30 patients who underwent revascularization, a regional resting dyssynergy was observed in 225 segments, assuming that postrevascularization functional recovery (which occurred in 126 segments) was the gold standard; combined dipyridamole-dobutamine showed a higher sensitivity (90% confidence interval [CI] 85% to 95%) than thallium-201, dobutamine, or dipyridamole (87%, CI 81% to 92%; 82%, CI 76% to 89%; and 82%, CI 76% to 89%, respectively). Specificity was lower for viability recognition with thallium-201 (61%, CI 51% to 71%) than with dobutamine (93%, CI 88% to 98%), dipyridamole (95%, CI 91% to 99%), and combined dipyridamole-dobutamine (92%; CI 87% to 97%). Combined adrenergic and adenosinergic stimulation recruits an inotropic reserve in a significant proportion of segments with preserved thallium uptake that were nonresponders after either dipyridamole or dobutamine. When functional recovery after successful revascularization is considered as the postoperative gold standard, thallium has a higher sensitivity than dipyridamole or dobutamine; this sensitivity gap is filled with combined dipyridamole-dobutamine. The specificity of all forms of pharmacologic stress echo is better than thallium-201.
Authors:
R Sicari; A Varga; E Picano; A C Borges; A Gimelli; P Marzullo
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The American journal of cardiology     Volume:  83     ISSN:  0002-9149     ISO Abbreviation:  Am. J. Cardiol.     Publication Date:  1999 Jan 
Date Detail:
Created Date:  1999-03-16     Completed Date:  1999-03-16     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0207277     Medline TA:  Am J Cardiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  6-10     Citation Subset:  AIM; IM    
Affiliation:
CNR Institute of Clinical Physiology, Pisa, Italy. rosas@ifc.pi.cnr.it
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MeSH Terms
Descriptor/Qualifier:
Cardiotonic Agents / diagnostic use*
Coronary Disease / radionuclide imaging*,  ultrasonography*
Dipyridamole / diagnostic use*
Dobutamine / diagnostic use*
Echocardiography* / methods
Follow-Up Studies
Humans
Predictive Value of Tests
Radionuclide Ventriculography* / methods
Sensitivity and Specificity
Thallium Radioisotopes / diagnostic use*
Vasodilator Agents / diagnostic use*
Chemical
Reg. No./Substance:
0/Cardiotonic Agents; 0/Thallium Radioisotopes; 0/Vasodilator Agents; 34368-04-2/Dobutamine; 58-32-2/Dipyridamole

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