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Utility of the dobutamine stress echocardiography in the evaluation of the effects of a surgical repair of aortic coarctation in children.

BACKGROUND
Exercise-induced hypertension following repair of the coarctation of the aorta (CoA) is a well known phenomenon. The most important functional parameters in the assessment of the effects of a surgical repair of CoA are the maximal pressure gradient in the descending aorta (GRAD) and systolic blood pressure (SBP). Results of treadmill exercise test using the Bruce protocol (treadmill test) and dobutamine stress echocardiography (DSE) were compared to determine utility of the DSE in the evaluation of the effects of surgical treatment of CoA in children.


METHODS
The study population comprised of 29 patients, including 20 males and 9 females (mean age 12 years) who underwent a surgical repair of CoA. Changes of the cardiovascular parameters including SBP, GRAD and heart rate (HR) during the treadmill test and DSE were compared.


RESULTS
During the treadmill test, SBP at peak exercise ranged from 120 to 230 (mean 163.7) mm Hg, GRAD ranged from 29 to 109 (mean 59.8) mm Hg, and HR ranged from 140 to 188 (mean 169) bpm. At the end of DSE, SBP ranged from 123 to 215 (mean 164.7) mm Hg, GRAD ranged from 29 to 113 (mean 55.4) mm Hg, and HR ranged from 76 to 155 (mean 111) bpm. We found positive correlations of SBP (r = 0.68, p < 0.001) and GRAD (r = 0.82, p < 0.001) values during both tests but no significant correlation for HR (r = 0.42, p = NS).


CONCLUSIONS
Dobutamine stress echocardiography is useful in the evaluation of the effects of surgical repair of CoA in children.