CT attenuation correction improves quantitative risk prediction by cardiac SPECT in obese patients
EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING(2024)
摘要
Purpose This study aimed to compare the predictive value of CT attenuation-corrected stress total perfusion deficit (AC-sTPD) and non-corrected stress TPD (NC-sTPD) for major adverse cardiac events (MACE) in obese patients undergoing cadmium zinc telluride (CZT) SPECT myocardial perfusion imaging (MPI).Methods The study included 4,585 patients who underwent CZT SPECT/CT MPI for clinical indications (chest pain: 56%, shortness of breath: 13%, other: 32%) at Yale New Haven Hospital (age: 64 +/- 12 years, 45% female, body mass index [BMI]: 30.0 +/- 6.3 kg/m(2), prior coronary artery disease: 18%). The association between AC-sTPD or NC-sTPD and MACE defined as the composite end point of mortality, nonfatal myocardial infarction or late coronary revascularization (> 90 days after SPECT) was evaluated with survival analysis.Results During a median follow-up of 25 months, 453 patients (10%) experienced MACE. In patients with BMI >= 35 kg/m(2) (n = 931), those with AC-sTPD >= 3% had worse MACE-free survival than those with AC-sTPD < 3% (HR: 2.23, 95% CI: 1.40 - 3.55, p = 0.002) with no difference in MACE-free survival between patients with NC-sTPD >= 3% and NC-sTPD < 3% (HR:1.06, 95% CI:0.67 - 1.68, p = 0.78). AC-sTPD had higher AUC than NC-sTPD for the detection of 2-year MACE in patients with BMI >= 35 kg/m(2) (0.631 versus 0.541, p = 0.01). In the overall cohort AC-sTPD had a higher ROC area under the curve (AUC, 0.641) than NC-sTPD (0.608; P = 0.01) for detection of 2-year MACE. In patients with BMI >= 35 kg/m(2) AC sTPD provided significant incremental prognostic value beyond NC sTPD (net reclassification index: 0.14 [95% CI: 0.20 - 0.28]).Conclusions AC sTPD outperformed NC sTPD in predicting MACE in patients undergoing SPECT MPI with BMI >= 35 kg/m(2). These findings highlight the superior prognostic value of AC-sTPD in this patient population and underscore the importance of CT attenuation correction.
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关键词
SPECT,Myocardial perfusion,Prognosis,Attenuation correction,Hybrid imaging,Obesity
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