Key result
Low contrast CTA provided similar image quality to conventional CTA for TAVR planning, with no significant difference in signal-to-noise ratio (MD -1.42, p=0.52).
Why the study?
Low contrast CTA for TAVR planning is desirable in patients with renal dysfunction but is not yet well established.
Does low contrast CTA provide similar image quality to conventional CTA in patients with aortic stenosis undergoing TAVR planning?
Meta-Analysis (n=353)
Yes
Does low contrast CTA provide similar image quality to conventional CTA in patients with aortic stenosis undergoing TAVR planning?
Low contrast CTA provides similar objective image quality to conventional CTA for TAVR planning, supporting its use to minimize contrast-induced nephropathy risk in patients with renal dysfunction.
Answers are grounded in this paper and cite their sources.
Low-contrast CTA feasible for TAVR planning in renal impairment; extends evidence but requires prospective validation before routine adoption.
Purpose : The use of low contrast CTA for TAVR is desirable in patients with renal dysfunction but is not yet well established. This systematic review and meta-analysis compares low contrast computed tomography angiography (CTA) versus conventional CTA in patients with aortic stenosis undergoing transcatheter aortic valve replacement (TAVR) planning. Methods : We performed a systematic literature review to identify clinical studies comparing imaging strategies for patients with aortic stenosis undergoing TAVR planning. The primary outcomes of image quality as assessed by the signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) were reported as random effects mean difference with 95% confidence interval. No prior ethical approval was required since all data is public. Results : Our search yielded 126 potential studies. We included 6 studies reporting on 353 patients. There was no difference in SNR between the low-dose and conventional protocols with a mean difference of -1.42 (95% CI -5.71-2.88, p = 0.52). There was no difference in CNR between the low-dose and conventional protocols with a mean difference of -3.83 (95% CI -9.98-2.32, p = 0.22). Conclusion : This systematic review and meta-analysis suggests that low contrast CTA for TAVR planning provides similar image quality to conventional CTA.
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Lacy et al. (2022) conducted a meta-analysis in Aortic stenosis undergoing TAVR planning (n=353). Low contrast computed tomography angiography (CTA) vs. Conventional CTA (e.g., 60-120 ml contrast, 100-120 kV) was evaluated on Image quality assessed by signal-to-noise ratio (SNR) (MD -1.42, 95% CI -5.71-2.88, p=0.52). Low contrast CTA provided similar image quality to conventional CTA for TAVR planning, with no significant difference in signal-to-noise ratio (MD -1.42, p=0.52).
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