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A patient deemed inoperable still may not be a good TAVR candidate, unfortunately. Arteries that are too small to accommodate a catheter safely, for example, may eliminate TAVR as an option. Dr. Mick notes, however, that recently approved TAVR valves are smaller than earlier generations of the device, meaning more patients may be good candidates. And even if TAVR appears to be a safe choice, open surgery may still be necessary.