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To examine whether atrial natriuretic polypeptide (ANP) is released from the left ventricle in patients with dilated cardiomyopathy (DCM) we measured plasma ANP level in the aortic root (Ao), the anterior interventricular vein (AIV), the great cardiac vein (GCV), and the coronary sinus (CS) in 11 patients with DCM and 18 control subjects. Plasma ANP levels in Ao, AIV, GCV, and CS were 454 +/- 360, 915 +/- 584, 1,308 +/- 926, and 1,884 +/- 1,194 pg/ml, respectively, in the patients with DCM and 108 +/- 42, 127 +/- 55, 461 +/- 224, and 682 +/- 341 pg/ml, respectively, in the control subjects. There was no significant difference in the plasma ANP levels between Ao and AIV in the control subjects. On the contrary, there was a significant (P less than 0.001) step-up in plasma ANP levels between Ao and AIV in patients with DCM. Thus, the difference in ANP levels between Ao and AIV was significantly increased in patients with DCM as compared with the control subjects (461 +/- 248 vs. 19 +/- 59 pg/ml, P less than 0.001). The difference in ANP levels between Ao and CS was also significantly increased in patients with DCM as compared with the control subjects (1,429 +/- 890 vs. 577 +/- 318 pg/ml, P less than 0.001). We conclude that ANP is released in increased amounts into the circulation from the left ventricle as well as from the heart as a whole in patients with DCM.

Increased secretion of atrial natriuretic polypeptide from the left ventricle in patients with dilated cardiomyopathy.