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In some pts with primary hypertension (PH) and ischaemic heart disease (IHD) the anginal pain, myocardial infarction and sudden death are considered to be related to the spasm of coronary artery which can be attributed to the increased reactivity of atherosclerotic arteries to serotonin (5HT).The aim of our study was to elucidate whether in pts with PH and IHD any interrelation between plasma free...