Provocation of chest pain in patients with coronary insufficiency using the vasodilator adenosine.

Chest pain provoked by intravenous injection of adenosine was compared with natural angina pectoris in five patients with ischaemic heart disease. In seven healthy subjects a possible myocardial site for provocation of the chest pain was evaluated by analysis of time delays from injection to symptoms. The healthy volunteers were given the maximum tolerable dose of adenosine intravenously, together with 99Technetium-diethylentriaminpentaacetate (99Tcm-DTPA). Chest pain started after 4.1 +/- 2.4 s and reached its maximum 8.4 +/- 4.1 s after maximum left ventricular radioactivity. The patients with a history of typical angina pectoris were given similar doses of intravenous adenosine and the provoked chest pain did not differ in quality from the patients' habitual angina pectoris. The patients did not develop electrocardiographic signs suggesting myocardial ischaemia. Heart rate and blood pressure did not indicate increased myocardial work. In conclusion, the results concur with the hypothesis that adenosine elicits angina pectoris by stimulation of intracardiac adenosine receptors.