<qa>  What is the solution of human BNP-32?3.0 pmolkgmin human BNP-32 American Peptide, Calif., US which is solved in Haemaccel 10 mLh, or placebo Haemaccel, 10 mLh, alone will be continuously administered for 4 hours, between time points -60 and 180 minutes, using a syringe pump Treonic, Vickers Medical, Basingstoke, United Kingdom. A washout period of at least 2 weeks will be between the administration of BNP and placebo on the two different study days. This protocol has been used in the study of Lainchbury et al. 17. 