to evaluate the role of the autonomic nervous system , especially the parasympathetic nervous system , in the initiation mechanism of vasospastic angina pectoris ( ap ) , the coefficient of r-r interval variation ( cv ) on the electrocardiogram ( ecg ) and plasma catecholamine concentration were measured in 25 patients with vasospastic ap , 10 patients with effort ap and 12 control subjects .
C0004388
autonomic nervous system
C0030510
parasympathetic nervous system