See: http://www.medsum.info

I responded to Rachel’s original request at Twitter by saying that I used to look for the most frequent Subject Headings by one command in the (expensive) STN-database. I had no idea that this could be done for free with a 3rd party MEDLINE/PubMed tool. And now there are several possibilities! Very useful when one wants to get a hint of which MeSH are most appropriate.

Coincidentally I found another 3rd party tool which does the job, and in my opinion, even better: PubMed PubReminer

http://bioinfo.amc.uva.nl/human-genetics/pubreminer/.
(It is produced by someone at our institute and I was asked to have a look at it).

It’s lay-out isn’t very user-friendly, but if I type the 3 PMID’s you gave, it shows several lists with the most frequently occurring words on top.
These are the lists (columns): Year, Author, Journal, (Text)Word, MeSH, Substance, Country.

What I like most is that it also includes Mesh and their subheadings. To find the combination can be very important for your search (and it is this possibility I missed most in the other tools.)
For instance, your 3 PubMed ID’s yield: Urinary Catheterization/instrumentation twice and Urinary Tract Infections/etiology once.

Especially important for words having no single MeSH, e.g.
EGFR-inhibitors –> (MeSH) Receptor, Epidermal Growth Factor/antagonists & inhibitors

It ’s also great to see the most frequent textwords and substance names as well.

I will try to give some examples at my own blog later.