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The Pathophysiology of Labor Dystocia: Theme with Variations

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Abstract

Abnormally prolonged labor, or labor dystocia, is a common complication of parturition. It is the indication for about half of unplanned cesarean deliveries in low-risk nulliparous women. Reducing the rate of unplanned cesarean birth in the USA has been a public health priority over the last two decades with limited success. Labor dystocia is a complex disorder due to multiple causes with a common clinical outcome of slow cervical dilation and fetal descent. A better understanding of the pathophysiologic mechanisms of labor dystocia could lead to new clinical opportunities to increase the rate of normal vaginal delivery, reduce cesarean birth rates, and improve maternal and neonatal health. We conducted a literature review of the causes and pathophysiologic mechanisms of labor dystocia. We summarize known mechanisms supported by clinical and experimental data and newer hypotheses with less supporting evidence. We review recent data on uterine preparation for labor, uterine contractility, cervical preparation for labor, maternal obesity, cephalopelvic disproportion, fetal malposition, intrauterine infection, and maternal stress. We also describe current clinical approaches to preventing and managing labor dystocia. The variation in pathophysiologic causes of labor dystocia probably limits the utility of current general treatment options. However, treatments targeting specific underlying etiologies could be more effective. We found that the pathophysiologic basis of labor dystocia is under-researched, offering wide opportunities for translational investigation of individualized labor management, particularly regarding uterine metabolism and fetal position. More precise diagnostic tools and individualized therapies for labor dystocia might lead to better outcomes. We conclude that additional knowledge of parturition physiology coupled with rigorous clinical evaluation of novel biologically directed treatments could improve obstetric quality of care.

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Data Availability

All data and material are available upon request to the corresponding author.

Abbreviations

ACNM:

American College of Nurse Midwives

ACOG:

American College of Obstetricians and Gynecologists

SMFM:

Society for Maternal–Fetal Medicine

CPD:

Cephalopelvic disproportion

ATP:

Adenosine triphosophate

pCRH:

Placental corticotropin releasing hormone

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Funding

This work was supported by an F31 Ruth L. Kirschstein Pre-Doctoral Individual National Research Service Award from the National Institute of Nursing Research of the National Institutes of Health under award number FN31NR018582-01 (to KK).

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KK conducted the review and drafted the text with guidance from KJH. KK and KJH wrote and revised the manuscript. Both authors read and approved the final manuscript.

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Correspondence to K. Joseph Hurt.

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Summary sentence: Labor dystocia leading to unplanned cesarean delivery is mediated by distinct mechanisms which we summarize here to facilitate translational research and new clinical approaches to increase the rate of successful vaginal birth.

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Kissler, K., Hurt, K.J. The Pathophysiology of Labor Dystocia: Theme with Variations. Reprod. Sci. 30, 729–742 (2023). https://doi.org/10.1007/s43032-022-01018-6

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