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Acta médica Grupo Ángeles

Print version ISSN 1870-7203


WOOG CASTANON, Alberto et al. Maternal and neonatal risk factors associated with obstetric anal sphincter injuries. Acta méd. Grupo Ángeles [online]. 2021, vol.19, n.2, pp.204-207.  Epub Nov 23, 2021. ISSN 1870-7203.


Perineal tear is a complication of labor; perineal tears are continuity solutions that may be accompanied by minor bruises, muscle tears, or major lacerations. Perineal tears are subclassified in first degree tears damage to skin; second degree perineal damage muscles; the third degree is subclassified in (A) that covers damage in less than 50% of the external anal sphincter (EAE), (B) more than 50% of EAE without including the internal one and (C) includes the loss of the internal anal sphincter; and the fourth degree includes the anterior and the damage of rectal mucosa.


To identify the demographic, obstetric and neonatal characteristics that are related to perineal tears and to identify the risk factors associated with anal sphincter injury.

Material and methods:

Descriptive, retrospective, and observational study with review of the physical database of patients treated at a private hospital in Mexico City, which looked for severe perineal tear in maternal complications, which were compared with moderate perineal tear.


No risk factor associated with severe perineal tear was found.

Keywords : Perineal tear; severe perineal tear; risk factors for severe perineal tear; obstetric anal sphincter injury.

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