25th May 2025

A 45-year-old man with hypercholesterolaemia and obesity contacts his GP with worsening dyspnoea, orthopnoea and bilateral leg swelling.

A 45-year-old man with hypercholesterolaemia and obesity contacts his GP with worsening dyspnoea, orthopnoea and bilateral leg swelling. His GP requests blood tests including BNP. Where is BNP mainly produced?  

Select the SINGLE most appropriate option from the list below. Select ONE option only.