Intravascular imaging vs. angiography alone to guide percutaneous coronary intervention in older adults: a meta-analysis of randomized controlled trials.

BACKGROUND: Older adults undergoing percutaneous coronary intervention (PCI) face unique challenges due to complex anatomy and comorbidities. Intravascular imaging [including intravascular ultrasound (IVUS) and optical coherence tomography (OCT)] has been shown to improve PCI outcomes, but its benefits in older adults are less well established. We conducted a meta-analysis of randomized controlled trials (RCTs) to compare intravascular imaging with angiography alone to guide PCI in older adults. METHODS: Cochrane, PubMed, and Scopus were searched for RCTs comparing intravascular imaging (IVUS or OCT) vs. angiography alone in adults aged ≥65 years. The outcome of interest was major adverse cardiovascular events (MACE) at the longest follow-up, as defined by each trial. Subgroup analyses were performed based on intravascular imaging modality, age group, and lesion complexity. Data were pooled using random-effects models, and heterogeneity was assessed using Higgins' I² statistic. RESULTS: Nine RCTs (n = 7164, intravascular imaging = 3703, angiography alone = 3461) met the inclusion criteria. Intravascular imaging significantly reduced MACE compared with angiography alone [relative risk (RR) 0.66, 95% confidence interval (CI) 0.56-0.77; P < 0.001; I² = 0%]. IVUS demonstrated superiority over angiography alone (RR 0.55, 95% CI 0.43-0.72; P < 0.001; I² = 0%), while OCT demonstrated only a trend toward MACE reduction (RR 0.80, 95% CI 0.62-1.02). Subgroup analyses indicated consistent benefits with intravascular imaging for adults aged ≥65 and ≥70 years, respectively, and among those with complex coronary lesions (RR 0.65, 95% CI 0.53-0.79; P < 0.001). CONCLUSION: Intravascular imaging guidance, especially IVUS, reduces MACE in older adults undergoing PCI compared with angiography alone.