Table 1. Origin and drainage of fistulae.

Origin	Prevalence (%)	Drainage	Prevalence (%)
LAD	25–42	RA	19–26
RCA	50–60	RV	14–40
Both	5	LA	5–6
Diagonal	1.9	LV	2–19
Marginal	0.7	PA	15–20.2
Circumflex	18.3	CS	7
Single coronary	3	SCV	1

Abbreviations: CS, coronary sinus; LA, left atrium; LAD, left anterior descending; LV, left ventricle; PA, Pulmonary artery; RA, right atrium; RCA, right coronary artery; RV, right ventricle; SVC, superior vena cava.

Source: Adapted from Dodge-Khatami et al⁶.

Note: Low-pressure structures, such as the right chambers of the heart and the pulmonary artery are the most common sites of drainage.¹⁹