Does Antenatal Fetal Head Circumference Predict Anal Sphincter Injury, a Prospective Study

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00580879
Recruitment Status : Completed
First Posted : December 27, 2007
Last Update Posted : January 11, 2010
Information provided by:
University of California, Irvine

Brief Summary:
The purpose of this study is to see if fetal head circumference can be used as a predictor for who will experience a sphincter laceration while delivering.

Condition or disease
Anorectal Sphincter Laceration Pelvic Floor Dysfunction

Detailed Description:
Even though much work has been invested in trying to identify risk factors that can predict which population will suffer from sphincter tears and other pelvic floor trauma, the epidemiology is still poorly understood. Factors that have been implicated to include operative vaginal delivery, birth weight, and primaparity. Up to this point little focus has been placed on antenatal factors that would help predict and prevent sphincter disruptions. At the time of birth the infant's head is the largest part of the body. Thus, head circumference of the infant may be able to predict which subjects is more likely to suffer from sphincter disruption. Thus, this study aims to determine whether or not fetal head circumference measured antenatally is predictive of pelvic floor trauma.

Study Type : Observational
Estimated Enrollment : 80 participants
Observational Model: Cohort
Time Perspective: Prospective
Official Title: Does Antenatal Fetal Head Circumference Predict Anal Sphincter Injury, a Prospective Study
Study Start Date : January 2005
Actual Primary Completion Date : March 2009
Actual Study Completion Date : March 2009

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Tears

Primary Outcome Measures :
  1. Fetal head circumference and position, maternal pelvis, infant weight, maternal weight, length of the second stage, the incidence of sphincter tears as diagnosed by transvaginal ultrasound as well as the incidence of fecal urgency and incontinence. [ Time Frame: 6 Months ]

Secondary Outcome Measures :
  1. The magnitude of the effect of other factors such as maternal obesity, maternal age, duration of labor and pelvimetry on the risk of anorectal lacerations will be examined. [ Time Frame: 6 Months ]

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
Women in 36 weeks and upto 42 weeks of pregnancy

Inclusion Criteria:

  • Primiparous subjects at least 18 years of age
  • Gestational age greater than or equal to 36 weeks and upto 42 weeks gestation
  • Subjects must have give written informed consent to participate in this study
  • Subjects must be planning to deliver at UCI

Exclusion Criteria:

  • Subjects less than 18 years of age
  • Subjects with a previous delivery
  • Subjects with previous colorectal surgery or hemorrhoidal surgery
  • Subjects with a history of irritable bowel syndrome, ulcerative colitis, or Crohn's disease
  • Subjects with a history of colon or rectal cancer
  • Gestational age less than 36 weeks
  • Cesarean section

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00580879

United States, California
University of California, Irvine Medical Center
Orange, California, United States, 92868
Sponsors and Collaborators
University of California, Irvine
Principal Investigator: Karen L Noblett, M.D. University of California, Irvine

Responsible Party: Karen Noblett, Associate Professor, University of California, Irvine Medical Center Identifier: NCT00580879     History of Changes
Other Study ID Numbers: 2005-4575
First Posted: December 27, 2007    Key Record Dates
Last Update Posted: January 11, 2010
Last Verified: January 2010

Keywords provided by University of California, Irvine:
Anorectal sphincter laceration
Pelvic floor dysfunction
Sphincter tear

Additional relevant MeSH terms:
Wounds and Injuries