Angina pectoris-like pain provoked by i.v. bolus of adenosine: relationship to coronary sinus blood flow, heart rate and blood pressure in healthy volunteers

European Heart Journal
C SylvénA Edlund

Abstract

After finding the maximum tolerated i.v. bolus dose of adenosine, three fractions of this dose were given randomly to five volunteers in a double-blind manner. Pain, estimated by a 10-graded category-ratio scale, ECG and coronary sinus blood flow (CSBF), measured by thermodilution and intra-arterial blood pressure, were continuously recorded. At the highest tolerated dose (10.3 +/- 2.3 mg), the ECG showed short lasting (less than 5 s) AV-block but no ischaemic signs. Following the maximum dose, pain started 15 +/- 2 s after injection, reached a maximum (median 6 of 10 grades) after 25 +/- 4 s and disappeared after 62 +/- 7 s. Basal CSBF was 84 +/- 14 ml/min-1, and increased to 297 +/- 48 ml/min. The rise in CSBF started 2.4 +/- 0.8 s before pain appeared (P less than 0.05), but reached its peak 18 +/- 2 s after maximum pain (P less than 0.005). Although maximum coronary vasodilation was induced at the lowest dose of adenosine given--1/3 of the maximum dose--chest pain increased in a dose-dependent manner. When AV-block did not occur, diastolic pressure did not change from baseline, while systolic blood pressure increased by 5 +/- 2% (ANOVA, P less than 0.0001) and heart rate increased by 40 +/- 7% (ANOVA, P less than 0.0001). F...Continue Reading

Citations

Dec 5, 1991·The New England Journal of Medicine·A J Camm, C J Garratt
Dec 13, 1997·Circulation·F Crea, A Gaspardone
Aug 1, 1990·Circulation·C Sylvén, B Lagerquist
Nov 1, 1990·Circulation·R F WilsonD D Laxson
Jan 1, 1990·Circulation·F CreaA Maseri
Feb 1, 1993·Cardiovascular Drugs and Therapy·A D MalcolmA J Camm

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