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We read with interest the paper by Vorwerk et al.1 Their research question is clearly of importance, but we would like to raise the following points:
It is a misconception that the majority of patients with ‘cardiac’ breathlessness will have impaired cardiac function, eg, the ADHERE heart failure registry of over 100 000 patients demonstrated that 50.4% of patients hospitalised with heart …
Competing interests None to declare.
Provenance and peer review Not commissioned; not externally peer reviewed.