Table 2

Patient groups requiring particular care

Potential for enhanced effects of adenosine	Elderly people
Potential for enhanced effects of adenosine	Sinus node dysfunction
	Dipyridamole
	Carbamazepine
	Drugs affecting AV conduction (digoxin, verapamil, β blockers)
Potential for reduced effect of adenosine	Theophylline
Potential for reduced effect of adenosine	Caffeine
Potential for induction of tachyarrhythmias	History of recurrent palpitation (suggesting possibility of latent pre-excitation or dual AV node physiology^54,⁵⁵)