Racial differences in pelvic floor muscle thickness in asymptomatic nulliparas as seen on magnetic resonance imaging–based three-dimensional color thickness mapping - 22/08/11

Doi : 10.1016/j.ajog.2007.08.015

Keith T. Downing, MD, MPA ^a,^{^{Both authors contributed equally to the study and manuscript.}}, Lennox P. Hoyte, MD ^b,^{^{Both authors contributed equally to the study and manuscript.},}^⁎ , Simon K. Warfield, PhD ^c, Alison C. Weidner, MD ^d
^a Department of Obstetrics and Gynecology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA
^b Division of Urogynecology, Department of Obstetrics and Gynecology, University of South Florida College of Medicine and Tampa General Hospital, Tampa, FL
^c Computational Radiology Laboratory, Department of Radiology, Children’s Hospital, Boston, MA
^d Division of Urogynecology, Department of Obstetrics and Gynecology, Duke University School of Medicine, Durham, NC

Reprints: Lennox Hoyte, MD, 4 Columbia Dr, Suite 504, Tampa, Florida, 33606

Résumé

Objective

The objective of the study was to compare levator and obturator thickness between asymptomatic black and white nulliparas using three-dimensional (3D) magnetic resonance imaging (MRI) color mapping.

Study Design

3D color-mapped MRI of pelvic muscles were evaluated in 22 similar nulliparas (12 black, 10 white). Levator and obturator (OI) were divided into right and left. Levator was subdivided into puborectalis (PR) and ileococcygeus (IC) portions. Maximal thickness of each muscle was recorded and compared between groups. Nonparametric testing was applied, with significance at P = .05.

Results

Levator thickness was significantly greater in blacks bilaterally (median right PR, 8.5 vs 6.0 mm; P = .001; right IC, 6.5 vs 4.5 mm; P = .002; left PR, 9.5 vs 5.75 mm; P = .0002; left IC, 6.5 vs 5.75 mm; P = .02). Obturator thicknesses were similar (right OI, 20.0 vs 19.5 mm; left OI, 19.25 vs 19.25 mm; P = NS).

Conclusion

Significantly thicker levators but similar obturators were seen in black nulliparas, compared with white nulliparas. These levator differences may influence pelvic floor dysfunction risk. The clinical significance of these findings is under study.

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Key words : levator ani morphology, magnetic resonance imaging, pelvic floor dysfunction, pelvic floor muscles, three-dimensional, race

Plan

Materials and Methods

Results

Comment

Supported in part by National Institutes of Health Grants HD38661-05 and RR021885.
Cite this article as: Downing KT, Hoyte LP, Warfield SK, et al. Racial differences in pelvic floor muscle thickness in asymptomatic nulliparas as seen on magnetic resonance imaging-based three-dimensional color thickness mapping. Am J Obstet Gynecol 2007;197:625.e1-625.e4.

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Vol 197 - N° 6

P. 625.e1-625.e4 - décembre 2007 Retour au numéro

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Racial differences in pelvic floor muscle thickness in asymptomatic nulliparas as seen on magnetic resonance imaging–based three-dimensional color thickness mapping - 22/08/11

Résumé

Objective

Study Design

Results

Conclusion

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