Table 2.

Feasibility of harmonic mode transthoracic echocardiographic visualization of coronary arteries with regard to arterial segment (results are given as a ratio in which the numerator is a number arterial segments visualized and denominator – number of arterial segments studied) [9-11]

Coronary artery	Proximal segment	Middle segment	Distal segment
LAD
Ref. [10]	34/50 (68%) #	35/50 (70%) #	34/50 (68%) #
Ref. [11]	20/20 (100%) *	16/16 (100%) *	1/1 *
Cx
Ref. [10]	17/45 (38%) #	11/45 (24%) #	-
Ref. [11]	4/5 *	2/3 *	-
RCA
Ref. [10]	14/45 (31%) #	-	15/45 (33%) #
Ref. [11]	3/4 *	5/15 *	1/2 *
Ref. [9]	-	-	62/81 (76%) #

# Not contrast enhanced TTE; patients scheduled for primary coronary angiography [9,10] * Contrast enhanced TTE; patients scheduled for control coronary angiography [11] Abbreviations used in the table: LAD – left anterior descending coronary artery Cx – left circumflex coronary artery RCA – right coronary artery