Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9956821 | International Journal of Cardiology | 2005 | 4 Pages |
Abstract
Background: An increased lung to heart ratio (LHR) on thallium-201 (Tl-201) stress myocardial perfusion imaging (MPI) is a predictor of adverse cardiac events and identifies people with extensive coronary artery disease (CAD). The implications of increased LHR in patients undergoing stress technetium-99m (tc-99m) sestamibi are developing. Our aim is to evaluate the relationship between increased LHR and extent of CAD in patients undergoing tc-99m sestamibi MPI. Methods: We reviewed the records and images of 530 consecutive subjects who underwent exercise or adenosine tc-99 m sestamibi MPI. One hundred thirty-two had transient or partially reversible myocardial perfusion defects and 79 (exercise=34, adenosine=45, male=43, female=36, mean age=61 years) of these underwent coronary angiography (study population). The average LHR of these 79 subjects was compared to 79 patients (control population) with normal scans (exercise=50, adenosine=29, male=34, female=45, mean age=60 years). Results: The mean LHR (±SE) in subjects with normal scans was 0.30±0.01. The mean LHR for those with abnormal scans and single vessel CAD who underwent exercise was 0.32±0.01 and pharmacological stress was 0.31±0.01. There was no statistically significant difference between the LHR of those with a normal scan and those with single vessel disease and an abnormal scan. However, there was a statistically significant association between the elevated LHR and multi-vessel CAD. The mean LHR for subjects with multi-vessel CAD with exercise was 0.39±0.01 (p=0.000) and for adenosine was 0.39±0.02 (p=0.000). Conclusion: An elevated LHR in patients undergoing exercise or pharmacological tc-99m MPI correlates with multi-vessel CAD.
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Authors
Shekar P. Kumar, Stacy D. Brewington, Kevin F. O'Brien, Assad Movahed,