In Response

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We appreciate Kim et al1 for bringing their work to our attention.1 We certainly would have cited their work in our recent article if we were aware of their publications. The images obtained with a microconvex probe have more depth with sufficient resolution to visualize structures not usually seen with more common, widely available linear array vascular probes. In a commentary to the publication of Kim et al, Lamperti and Pittiruti2 made the point that microconvex probes are not widely available, which may prevent many providers from utilizing the techniques proposed by Kim et al. We currently do not have any microconvex probes available at our medical center. Readers may also be interested in a publication by Lanspa et al3 demonstrating the use of a microconvex probe for ultrasound guidance during infraclavicular subclavian vein central venous catheter placement. Kim et al4 subsequently published a description of supraclavicular subclavian vein access using ultrasound guidance with a microconvex probe. The microconvex probe does indeed appear to hold significant promise for ultrasound guidance and catheter positioning during central venous catheter placement.
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