DETAILED DESCRIPTION OF THE FIGURES The present invention may be more fully and easily understood when taken in conjunction with the accompanying drawing, in which: FIG.
1 is a graph illustrating the baseline concentration of plasma arginine vasopressin in each of ten different human patients under test; and FIG.
2 is a graph illustrating the change in systemic vascular resistance following administration of a selective antagonist.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is a therapeutic method for treating human and/or animal subjects afflicted with the pathological condition known as congestive heart failure.
The method utilizes a potent and selective class of antagonists for arginine-vasopressin (hereinafter "AVP") which have been previously prepared and evaluated as effective antagonists of vasopressin.
There are ten analogues in the class as a whole each of which conforms to the following general structure: ##STR1## Specifically, the 10 analogues comprising the class are as follows: 1.
[1-(.
beta.
-mercapto-.
beta.
,.
beta.
-cyclopentamethylenepropionic acid),2-(O-methyl)-D-tyrosine,4-valine,8-D-arginine]vasopressin; 2.
[1-(.
beta.
-mercapto-.
beta.
,.
beta.
-cyclopentamethylenepropionic acid, 2-(O-ethyl)-D-tyrosine,4-valine,8-D-arginine]vasopressin; 3.
[1-(.
beta.
-mercapto-.
beta.
,.
beta.
-cyclopentamethylenepropionic acid),2-(O-isopropyl)-D-tyrosine,4-valine,8-D-arginine]vasopressin; 4.
[1-(.
beta.
-mercapto-.
beta.
,.
beta.
-cyclopentamethylenepropionic acid),2-(O-n-propyl)-D-tyrosine,4-valine,8-D-arginine]vasopressin; 5.
[1-(.
beta.
-mercapto-.
beta.
,.
beta.
-cyclopentamethylenepropionic acid),2-(O-methyl)-D-tyrosine,4-valine]arginine-vasopressin; 6.
[1-(.
beta.
-mercapto-.
beta.
,.
beta.
-cyclopentamethylenepropionic acid),2-(O-ethyl)-D-tyrosine,4-valine]arginine-vasopressin; 7.
[1-(.
beta.
-mercapto-.
beta.
,.
beta.
-cyclopentamethylenepropionic acid),2-(O-isopropyl)-D-tyrosine,4-valine]arginine-vasopressin; 8.
[1,(.
beta.
-mercapto-.
beta.
,.
beta.
-cyclopentamethylenepropionic acid),2-(O-n-propyl)-D-Tyrosine,4-valine]arginine-vasopressin; 9
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Heart Surgery 
