Assessment of normal anal sphincter anatomy using transanal ultrasonography in healthy Korean volunteers: a retrospective observational study
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Background: To date, there have been no studies on the normal anatomic values of the anal sphincter in healthy Koreans. Therefore, this study aimed to determine the normal anatomic values of transanal ultrasonography (TAUS). Methods: The thickness of the external anal sphincter (EAS) and internal anal sphincter (IAS) was measured by TAUS from healthy Korean volunteers between September 2019 and August 2021. Results: Thirty-six volunteers with a median age of 37 years (range, 20–77 years) and a median body mass index (BMI) of 23.5 kg/m2 (range, 17.2–31.2 kg/m2) were examined. The median thickness of the EAS at 4 cm and 2 cm from the anal verge was 7.4 mm (range, 5.8–8.8 mm) and 6.5 mm (range, 5.6–8.0 mm), respectively. The median thickness of the IAS at 2 cm from the anal verge was 1.8 mm (range, 0.8-4.3 mm). There were no differences in sphincter muscle thickness between the sexes. However, the EAS tended to thicken as the BMI increased (EAS at 2 cm and 4 cm from the anal verge, Spearman rho=0.433, 0.363; p=0.008 and p=0.029, respectively). Conclusion: In healthy Korean, the median thickness of the IAS at 2 cm from the anal verge was 1.8 mm and the median thickness of the EAS at 2 cm and 4 cm from the anal verge was 6.5 mm and 7.4 mm respectively. There were no differences in anal sphincter thickness between sexes, but BMI was related to EAS thickness.
Abstract
Background: To date, there have been no studies on the normal anatomic values of the anal sphincter in healthy Koreans. Therefore, this study aimed to determine the normal anatomic values of transanal ultrasonography (TAUS). Methods: The thickness of the external anal sphincter (EAS) and internal anal sphincter (IAS) was measured by TAUS from healthy Korean volunteers between September 2019 and August 2021. Results: Thirty-six volunteers with a median age of 37 years (range, 20–77 years) and a median body mass index (BMI) of 23.5 kg/m2 (range, 17.2–31.2 kg/m2) were examined. The median thickness of the EAS at 4 cm and 2 cm from the anal verge was 7.4 mm (range, 5.8–8.8 mm) and 6.5 mm (range, 5.6–8.0 mm), respectively. The median thickness of the IAS at 2 cm from the anal verge was 1.8 mm (range, 0.8-4.3 mm). There were no differences in sphincter muscle thickness between the sexes. However, the EAS tended to thicken as the BMI increased (EAS at 2 cm and 4 cm from the anal verge, Spearman rho=0.433, 0.363; p=0.008 and p=0.029, respectively). Conclusion: In healthy Korean, the median thickness of the IAS at 2 cm from the anal verge was 1.8 mm and the median thickness of the EAS at 2 cm and 4 cm from the anal verge was 6.5 mm and 7.4 mm respectively. There were no differences in anal sphincter thickness between sexes, but BMI was related to EAS thickness.
참고문헌 (11)
- "Main surgery statistical yearbook for 2019" (2020)[URL]
- Volløyhaug I, "Is endoanal, introital or transperineal ultrasound diagnosis of sphincter defects more strongly associated with anal incontinence?", Int Urogynecol J, 31, pp.1471~1478 (2020)
- Walsh KA, "Use of endoanal ultrasound for reducing the risk of complications related to anal sphincter injury after vaginal birth", Cochrane Database Syst Rev, 2015, pp.CD010826~ (2015)
- Visscher AP, "Endoanal ultrasound in perianal fistulae and abscesses", Ultrasound Q, 31, pp.130~137 (2015)
- Burnett SJ, "Endosonographic variations in the normal internal anal sphincter", Int J Colorectal Dis, 6, pp.2~4 (1991)
- Nielsen MB, "Anal sphincter size measured by endosonography in healthy volunteers. Effect of age, sex, and parity", Acta Radiol, 33, pp.453~456 (1992)
- Enck P, "How reproducible are measures of the anal sphincter muscle diameter by endoanal ultrasound?", Am J Gastroenterol, 92, pp.293~296 (1997)
- Law PJ, "Anal endosonography : technique and normal anatomy", Gastrointest Radiol, 14, pp.349~353 (1989)
- Nielsen MB, "Endosonography of the anal sphincter : findings in healthy volunteers", AJR Am J Roentgenol, 157, pp.1199~1202 (1991)
- Huebner M, "Age effects on internal anal sphincter thickness and diameter in nulliparous females", Dis Colon Rectum, 50, pp.1405~1411 (2007)
- Frudinger A, "Female anal sphincter : age-related differences in asymptomatic volunteers with high-frequency endoanal US", Radiology, 224, pp.417~423 (2002)