Adenosine stress induced left bundle branch block during technetium-99m tetrofosmin myocardial perfusion imaging

• Main Authors: Mohan Roop Jayanthi, Arun Sasikumar, Arun Kumar Reddy Gorla, Ashwani Sood, Anish Bhattacharya, Bhagwant Rai Mittal
• Format: Article
• Language: English
• Published: Wolters Kluwer Medknow Publications 2017-01-01
• Series: World Journal of Nuclear Medicine
• Subjects: Adenosine-induced left bundle branch block; left bundle branch block; myocardial perfusion imaging; tetrofosmin
• Online Access: http://www.wjnm.org/article.asp?issn=1450-1147;year=2017;volume=16;issue=1;spage=78;epage=80;aulast=Jayanthi

The occurrence of left bundle branch block (LBBB) in electrocardiogram during exercise testing is a relatively rare finding. The incidence of LBBB during exercise testing ranges from 0.5% to 1.1%. The mechanism of exercise-induced LBBB (EI-LBBB) is poorly understood, but ischemia is a proposed etiology. Stress myocardial perfusion imaging (MPI) can be useful in patients with EI-LBBB to rule out coronary artery disease. Adenosine vasodilator stress is the preferred mode of stress in patients with LBBB for performing stress-MPI. Here we present an interesting case of adenosine-induced LBBB during stress-MPI in a 67-year-old female patient with normal coronary angiography.