Abstracts XIX Brazilian Congress of Nuclear Medicine
1. CARDIOLOGY
Vieira NW,Pereira Neto WC, Rabello AC, Pereira Filho WCP, Loures JBL, Muniz AJ, Pimentel RC, Miana AA, Vieira AAB, Barroso AA.
Prinzmetal et al. variant angina is characterized by coronary vasomotor dysfunction leading to coronary spasm. Hyperventilation Test (HVT) with the aim of producing myocardial ischaemia was carried out in 30 patients who had angina and less than 30% atheromatosis on coronariography. HVT consisted of voluntary hyperpnea for 6 minutes with electrocardiographic readings every 2 minutes. At 5 minutes, MIBITc99m radiopharmaceutical was injected and SPECT images were subsequently obtained and compared to images obtained prior to the test. HVT-provoked hyperpnea was efficient to provoke respiratory alkalosis in all 30 patients as confirmed by arterial gasometry. Such alkalosis led to transient perfusional deficit indicating myocardial ischaemia on myocardial scintigraphy in 7 patients (23,33%). We conclude that HVT is able to lead to myocardial ischaemia with electrocardiography showing litlle sensibility and MIBI myocardial scintigraphy being of paramount importance.