CURSOR Select Clause

I need to dynamically construct the field order of a cursor based on fixed labels from another table, but when I put that resulting query I receive the error:

Server: Msg 16924, Level 16, State 1, Line 78
Cursorfetch: The number of variables declared in the INTO list must match that of selected columns.

I have 6 fields defined in the cursor select, and 6 parameters in the fetch. The results of running the @sql portion returns valid data. Should this be possible to define a parameter containing the select clause of the cursor?

select colnum, coldesc, colname into #ae_defs from ae_adefs
select @Sql = (select colname from #ae_defs where coldesc = 'PATIENT NAME') +
', ' +
(select colname from #ae_defs where coldesc = 'PATIENT NUMBER') +
', ' +
(select colname from #ae_defs where coldesc = 'ACCOUNT NUMBER') +
', ' +
(select colname from #ae_defs where coldesc = 'VISIT DATE') +
', ' +
(select colname from #ae_defs where coldesc = 'VISIT TYPE') +
', DocID from ae_dtl1'

DECLARE myCursor CURSOR FOR
Select @SQL

OPEN myCursor
print @@Cursor_rows
FETCH NEXT FROM myCursor into @var1, @var2, @var3, @var4, @var5, @DocID