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Int J Cardiol. 2013 Oct 9;168(4):3791-6. doi: 10.1016/j.ijcard.2013.06.004. Epub 2013 Jul 12.

Discrepancies in vessel sizing between angiography and intravascular ultrasound varies according to the vessel evaluated.

Author information

1
Interventional Cardiology Unit, San Raffaele Scientific Institute, Milan, Italy; Interventional Cardiology Unit, EMO-GVM Centro Cuore Columbus, Milan, Italy; Interventional Cardiology Unit, New Tokyo Hospital, Chiba, Japan.

Abstract

BACKGROUND/OBJECTIVES:

Quantitative coronary analysis (QCA) of the coronary artery and stent size may be influenced by anatomical location in relation to both calibration point and the X-ray tube. The impact of this phenomenon on lesion assessment is undetermined.

METHODS:

In total, 427 consecutive patients who underwent PCI with intravascular ultrasound (IVUS)-guidance were enrolled. The minimum stent diameter (MSD) was measured using QCA (MSDQCA) and IVUS (MSDIVUS) analysis. We used reference objects positioned at a different height from the X-ray source to validate our approach.

RESULTS:

A statistically positive moderate correlation was observed between MSDQCA and MSDIVUS (r=0.649, p=0.001). The mean MSDQCA and MSDIVUS were 3.04±0.49 mm and 2.68±0.47 mm respectively. The difference between MSDQCA and MSDIVUS of >0.75 mm was more frequently observed in the LCx rather than in the LAD (7.4% in the LAD vs. 24.3% in the LCx, p=0.001). The discrepancy between the MSDQCA and MSDIVUS for the LCx was larger than for the LAD, and tended to be larger than for the RCA (13.3% vs. 18.5%, p=0.05 and 18.5% vs. 14.5%, p=0.17). A discrepancy >20% was more frequently observed in the small (≤2.5 mm) than in the large MSDIVUS group (52.7% vs. 25.1%, p=0.001). This discrepancy was more common in the LCx than in the LAD or RCA (48.6% vs. 30.9% vs. 31.2%, p=0.03).

CONCLUSIONS:

Assessment of the MSDQCA is more likely to overestimate in the LCx than in the LAD, particularly when the MSDIVUS is <2.5 mm. Therefore, we should be less aggressive in oversizing balloons and stents based on QCA for the LCx or small vessel intervention.

KEYWORDS:

Angiography; Discrepancy; Intravascular imaging; Lesion location; MSD

PMID:
23856443
DOI:
10.1016/j.ijcard.2013.06.004
[Indexed for MEDLINE]
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