I think youre mistaken, under the overview for cardiac stress testing https://next.amboss.com/us/search?q=Cardiac+pharmacological+stress+test&v=overview
Amboss says “Involves the administration of pharmacological agents to induce (and detect) an oxygen demand-supply mismatch in the myocardium. This is achieved either via an agent that causes dilation of the coronary arteries, which results in a coronary steal phenomenon (adenosine, dipyridamole), or an increase in heart rate and contractility, similar to that seen in exercise (dobutamine).” This highlights two different mechanisms for cardiac stress testing, there is even an amboss question that tests this exact concept AMBOSS