to determine whether heart rate contributes to release of three new peptide hormones synthesized in the heart , right ventricular pacing at rates of 100 , 125 , 150 , and 180 bpm was performed in six dogs with measurement of the plasma concentration of these peptides at each pacing rate while right atrial and systemic blood pressures were simultaneously monitored .
C0018787
heart
C0225883
right ventricular