Bartolini M, Massi L, Settimo L, Mema A, Pupi A, Sciagrà R. SBP ratio in exercise stress testing: validation by perfusion imaging.
J Cardiovasc Med (Hagerstown) 2013;
14:714-8. [PMID:
23328226 DOI:
10.2459/jcm.0b013e32835dbd44]
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Abstract
AIMS
The 3-min SBP ratio (SBPR) was proposed to detect significant coronary artery disease (CAD), but its relationship with abnormalities detected by myocardial perfusion-gated single-photon emission computed tomography (SPECT) was never examined.
METHODS
In 156 consecutive patients submitted to resting and exercise gated SPECT for suspect CAD, perfusion scores, ejection fraction and transient ischemic dilatation (TID) were evaluated and compared with SBPR.
RESULTS
There were weak correlations between SBPR and summed stress score (ρ = 0.232, P < 0.004), and summed difference score (SDS) (ρ = 0.228, P < 0.004). According to receiver operating characteristic analysis, SBPR was poorly effective for identifying patients with inducible ischemia (SDS ≥ 2): area under curve = 0.64, (P < 0.002), sensitivity = 82%, specificity = 40%. No relationship was registered between SBPR and postexercise ejection fraction drop, and the relationship with TID was poor (ρ = 0.263, P < 0.001).
CONCLUSION
In patients submitted to gated SPECT for suspect CAD, SBPR appears poorly effective for the detection of significant CAD, and does not show any valuable relationship with exercise-induced functional abnormalities.
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