The possible algogenic effects of elevated serum endothelin levels in cardiac syndrome X were investigated in a case-control study that examined somatic pain perception in the forearm during submaximal effort tourniquet and cold immersion tests. Pain threshold to both ischemic and cold stimulation of the forearm was demonstrated to be significantly lower in patients with syndrome X than in matched healthy controls, and a negative correlation between ischemic pain threshold and endothelin levels was demonstrated.
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