Another diagnostic method is the hyperventilation test
, but it is useful only in patients with multiple episodes of angina every day, and presents the risk of simultaneously inducing multi-vessel coronary artery spasm (Hung MJ 2014).
To exclude the possibility of coronary artery vasospasm, the patient who exhibited normal coronary anatomy underwent a hyperventilation test during the coronary arteriography.
Another limitation was the possibility of underlying coronary artery spasm in patients with Cardiac Syndrome X, which was excluded using a hyperventilation test, although the ergonovine test would have been the ideal test in this contest.
A symptom-limited exercise electrocardiography (ECG) performed up to Bruce stage V, showed no evidence of myocardial ischemia and hyperventilation test
was also normal.
Ours is the only laboratory in the region that offers a test for exercise-induced asthma called an eucapnic voluntary hyperventilation test
The diagnostic value of the EEG and hyperventilation test
in transient loss of consciousness.
To exclude the possibility of coronary artery vasospasm, during coronary arteriography all patients underwent a hyperventilation test
, which was performed by asking the patients to breathe quickly and deeply for 5 min.