[ECHO image quality of the left ventricle during dobutamine stress echocardiography]. / Jakosc obrazu echokardiograficznego w czasie testu obciazeniowego z dobutamina.

ABSTRACT

This study aimed at assessing ECHO image quality of the left ventricle during dobutamine stress echocardiography (ED). The study involved 582 patients without previous myocardial infarction. Their age ranged from 27 to 74 years, mean age 52 +/- 9. Dobutamine was given in stepwise increasing doses from 5 to 40 mcg/kg per minute. Atropine was added in 253 (43%) cases. The wall motion asynergy was evaluated by left ventricular echo image divided into 16 segments. At least one segment has not been visualised in 5.5% of patients. At the peak dose of administrated dobutamine (> 20 mcg/kg per minute) it increased to 6.1%. Unvisualized segments did not impair the test and did not affect negative or non diagnostic results, as was verified statistically. Patients' age, body weight and BMI did not exert a significant effect on the quality of echo image. Segments 5 and 11 were seen constantly during the whole test. Segment 13 was poorly visualised during the tests. Only in 1.5% of patients peak dose of dobutamine deteriorated the image, especially in segments 1, 3, 6, and 12. During the dobutamine echocardiography test the quality of ECHO image of left ventricular wall was worsening only in a few patients. It was not considered the reason of test interruption and did not impared the results of ED.