Predicted target heart rate is usually the parameter from a calculation that involves the age of the individual less a percentage of 10% or so. The stress test procedure should not exceed the target rate, but 72 beats per minute doesn't have much meaning unless the test was discontinued at that time?!
The test should reveal ischemia (lack of blood/oxygen) if and when the heart reaches the target beats per minute. The report indicates there was no ischema noted, and 72 bpm. Without more information and based on your posted information, I would conclude the test was incomplete but there is a suspicion of vessel occlusion!