Add items to a record variable

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Can anyone help me???

I work with plpgsql and I need to add items to a record variable, with a for
statement, something like this:

declare
v_rec record;
begin
for nn in (some_xpresion) loop
....

v_rec = vrec + [new_item]; <--Here I need to add an item to record variable with
each loop
end loop lp;

return v_rec;
end;

The result should be like {it1,it2,it3,i4,....}

Please can you help me?
Thanks a lot

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