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Added prognostic value of ischaemic threshold in radionuclide myocardial perfusion imaging: a common-sense integration of exercise tolerance and ischaemia severity.
MedLine Citation:
PMID:  25476258     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
PURPOSE: Reversible ischaemia at radionuclide myocardial perfusion imaging (MPI) accurately predicts risk of cardiac death and nonfatal myocardial infarction (major adverse cardiac events, MACE). This prognostic penetrance might be empowered by accounting for exercise tolerance as an indirect index of ischaemia severity. The present study aimed to verify this hypothesis integrating imaging assessment of ischaemia severity with exercise maximal rate pressure product (RPP) in a large cohort of patients with suspected or known coronary artery disease (CAD).
METHODS AND RESULTS: We analysed 1,502 consecutive patients (1,014 men aged 59 ± 10 years) submitted to exercise stress/rest MPI. To account for exercise tolerance, the summed difference score (SDS) was divided by RPP at tracer injection providing a clinical prognostic index (CPI). Reversible ischaemia was documented in 357 patients (24 %) and was classified by SDS as mild (SDS 2-4) in 180, moderate (SDS 5-7) in 118 and severe (SDS >7) in 59. CPI values of ischaemic patients were clustered into tertiles with lowest and highest values indicating low and high risk, respectively. CPI modified SDS risk prediction in 119/357 (33 %) patients. During a 60-month follow-up, MACE occurred in 68 patients. Kaplan-Meier analysis revealed that CPI significantly improved predictive power for MACE incidence with respect to SDS alone. Multivariate Cox analysis confirmed the additive independent value of CPI-derived information.
CONCLUSION: Integration of ischaemic threshold and ischaemia extension and severity can improve accuracy of exercise MPI in predicting long-term outcome in a large cohort of patients with suspected or known CAD.
Authors:
Cecilia Marini; Wanda Acampa; Matteo Bauckneht; Stefania Daniele; Selene Capitanio; Valeria Cantoni; Francesco Fiz; Emilia Zampella; Bassam Dib; Roberta Assante; Paolo Bruzzi; Gianmario Sambuceti; Alberto Cuocolo
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-12-5
Journal Detail:
Title:  European journal of nuclear medicine and molecular imaging     Volume:  -     ISSN:  1619-7089     ISO Abbreviation:  Eur. J. Nucl. Med. Mol. Imaging     Publication Date:  2014 Dec 
Date Detail:
Created Date:  2014-12-5     Completed Date:  -     Revised Date:  2014-12-6    
Medline Journal Info:
Nlm Unique ID:  101140988     Medline TA:  Eur J Nucl Med Mol Imaging     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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