All issues > Volume 47(2); 2004

Original Article

Korean J Pediatr. 2004;47(2):187-192. Published online February 15, 2004.

Ultrasonographic Bladder Parameters for Successful Suprapubic Bladder Aspiration

Sung Chul SC Baek¹, Hoe Kyoung HK Koo¹, Cheol Hong CH Kim¹, Kyung Bum KB Kim¹, Hyun Hee HH Lee¹, Byung Min BM Choi², Kee Hwan KH Yoo², Young Suk YS Hong², Dong Gwan DG Han¹

¹Department of Pediatrics, College of Medicine, Kwandong University, Goyang, Korea
²Department of Pediatrics, College of Medicine, Korea University, Seoul, Korea

Correspondence Byung Min BM Choi ,Email: cbmin@korea.ac.kr

Abstract

Purpose
: Suprapubic bladder aspiration(SBA) is a widely accepted method of obtaining sterile urine for culture in neonates but has a relatively low success rate and a few serious complications during SBA procedure. To improve the chance of obtaining urine, we determined the ultrasonographic bladder parameters(diameters and volume) to confirm that the bladder is adequately distended for successful aspiration of urine.
Methods
: In 94 newborn infants who required sterile collection of urine, ultrasonographic examination and SBA procedure were carried out. On the patient's suprapubic area, the maximal cephalocaudal and anteroposterior diameters were measured by sagittal scanning, and the maximal anteroposterior and transverse diameters by transverse scanning. Bladder volume was calculated using the formula for elliptic volume, and then urine was aspirated to maximum of 10 mL and the amount of urine aspirated was recorded.
Results
: Sufficient urine for culture(>1 mL) was obtained by SBA in 86(91.5%) of 94 infants. In the sagittal view, when the cephalocaudal diameter of the bladder was greater than 20 mm and the anteroposterior diameter was greater than 15 mm, the success rate was 100%. The cephalocaudal diameter of the bladder in sagittal view showed a more significant positive correlation with aspirated urine amount(r=0.65, P<0.001).
Conclusion
: The ultrasonographic sagittal view improved the success rate of SBA in neonates. A SBA was more likely to be successful when the cephalocaudal diameter of the bladder was above 20 mm and the anteroposterior diameter was above 15 mm.

Keywords :Suprapubic bladder aspiration, Ultrasonography, Bladder diameters, Bladder volume, Urinary tract infection, Infant