NOT "hemodynamics", please! :) In English, "hemodynamics" refers solely to blood flow around the body and the measurement thereof—this is a notorious false friend in medical translation.

You could even go with "catheterization laboratory" or "catheterization suite", but bear in mind that a "setor de hemodinâmica" in a large hospital will often have several suites/labs.

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Note added at 21 mins (2016-08-16 20:06:59 GMT)
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This has been addressed very well before:

http://www.proz.com/kudoz/portuguese_to_english/medical_gene...

http://www.proz.com/kudoz/portuguese_to_english/medical_gene...

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Note added at 28 mins (2016-08-16 20:14:22 GMT)
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And from the Libro rojo, but it applies equally well to the PT-EN pair:

cardiac catheterization

cardiac catheterization (cardiac cath). En relación con lo comentado en → catheterization, en español no decimos ‘cateterización cardíaca’, sino cateterismo cardíaco, coronariografía o incluso hemodinámica, según el contexto. ● diagnostic cardiac catheterization (hemodinámica diagnóstica).

cath lab (laboratorio de hemodinámica, sala de hemodinámica)
http://www.cosnautas.com/libro/8107-link?abrev=1&type=arrow

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Note added at 1 hr (2016-08-16 20:59:58 GMT)
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Haha! It's been 7 years, I think you get a free pass ;-) (Oi Luiza!)