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Introduction: Intrauterine pressure catheters are used for varying indications in laboring women. The stages of labor have not accounted for women's changing demographics, especially obesity. This study evaluates the relationship between resting and peak intrauterine tone and BMI, and predictors of intrauterine pressures among laboring women.

Methods: We retrospectively examined intrauterine pressure catheter values in women 18 who labored at Michigan Medicine from June 2010 to June 2014. Stage I resting and peak intrauterine pressure catheter measurements were obtained from fetal tracings. Multiple linear regression analyzed independent effects of demographic and labor characteristics on intrauterine pressure catheter measurements.

Results: Among 588 women with intrauterine pressure catheters, mean (SD) BMI was 33.0 (7.3) kg/m2, mean stage I resting pressure was 23.5 (8.5) mm Hg, and mean peak pressure was 68.0 (16.3) mm Hg. In multivariable models adjusted for age and race, overweight status [β 5.31 (95% CI: 2.66, 7.97)], obesity class I [5.46 (2.75, 8.17)], obesity class II [6.39 (3.54, 9.23)], obesity class III [7.19, (4.36, 10.01)], gestational age [0.10 (0.12, 0.19)], nulliparity [2.84 (0.99, 4.69)], and primiparity [3.21 (1.45, 4.97)] were correlated with increased stage I resting pressure. Only obesity class III status was associated with increased stage I peak pressure [7.30 (1.69,12.91)].

Conclusion/Implications: Resting intrauterine pressure is influenced by demographic characteristics including BMI and parity, but the same correlation was not observed for peak intrauterine pressures. Our findings highlight the need for modern labor guidelines regarding normal intrauterine pressures and their implications on labor outcomes.
Introduction: Intrauterine pressure catheters are used for varying indications in laboring women. The stages of labor have not accounted for women's changing demographics, especially obesity. This study evaluates the relationship between resting and peak intrauterine tone and BMI, and predictors of intrauterine pressures among laboring women.

Methods: We retrospectively examined intrauterine pressure catheter values in women 18 who labored at Michigan Medicine from June 2010 to June 2014. Stage I resting and peak intrauterine pressure catheter measurements were obtained from fetal tracings. Multiple linear regression analyzed independent effects of demographic and labor characteristics on intrauterine pressure catheter measurements.

Results: Among 588 women with intrauterine pressure catheters, mean (SD) BMI was 33.0 (7.3) kg/m2, mean stage I resting pressure was 23.5 (8.5) mm Hg, and mean peak pressure was 68.0 (16.3) mm Hg. In multivariable models adjusted for age and race, overweight status [β 5.31 (95% CI: 2.66, 7.97)], obesity class I [5.46 (2.75, 8.17)], obesity class II [6.39 (3.54, 9.23)], obesity class III [7.19, (4.36, 10.01)], gestational age [0.10 (0.12, 0.19)], nulliparity [2.84 (0.99, 4.69)], and primiparity [3.21 (1.45, 4.97)] were correlated with increased stage I resting pressure. Only obesity class III status was associated with increased stage I peak pressure [7.30 (1.69,12.91)].

Conclusion/Implications: Resting intrauterine pressure is influenced by demographic characteristics including BMI and parity, but the same correlation was not observed for peak intrauterine pressures. Our findings highlight the need for modern labor guidelines regarding normal intrauterine pressures and their implications on labor outcomes.
Intrauterine Pressure Catheter Measurements and Body Mass Index
Michelle Kappy
Michelle Kappy
ACOG ePoster. Kappy M. 04/27/2018; 212037; 31L
user
Michelle Kappy
Introduction: Intrauterine pressure catheters are used for varying indications in laboring women. The stages of labor have not accounted for women's changing demographics, especially obesity. This study evaluates the relationship between resting and peak intrauterine tone and BMI, and predictors of intrauterine pressures among laboring women.

Methods: We retrospectively examined intrauterine pressure catheter values in women 18 who labored at Michigan Medicine from June 2010 to June 2014. Stage I resting and peak intrauterine pressure catheter measurements were obtained from fetal tracings. Multiple linear regression analyzed independent effects of demographic and labor characteristics on intrauterine pressure catheter measurements.

Results: Among 588 women with intrauterine pressure catheters, mean (SD) BMI was 33.0 (7.3) kg/m2, mean stage I resting pressure was 23.5 (8.5) mm Hg, and mean peak pressure was 68.0 (16.3) mm Hg. In multivariable models adjusted for age and race, overweight status [β 5.31 (95% CI: 2.66, 7.97)], obesity class I [5.46 (2.75, 8.17)], obesity class II [6.39 (3.54, 9.23)], obesity class III [7.19, (4.36, 10.01)], gestational age [0.10 (0.12, 0.19)], nulliparity [2.84 (0.99, 4.69)], and primiparity [3.21 (1.45, 4.97)] were correlated with increased stage I resting pressure. Only obesity class III status was associated with increased stage I peak pressure [7.30 (1.69,12.91)].

Conclusion/Implications: Resting intrauterine pressure is influenced by demographic characteristics including BMI and parity, but the same correlation was not observed for peak intrauterine pressures. Our findings highlight the need for modern labor guidelines regarding normal intrauterine pressures and their implications on labor outcomes.
Introduction: Intrauterine pressure catheters are used for varying indications in laboring women. The stages of labor have not accounted for women's changing demographics, especially obesity. This study evaluates the relationship between resting and peak intrauterine tone and BMI, and predictors of intrauterine pressures among laboring women.

Methods: We retrospectively examined intrauterine pressure catheter values in women 18 who labored at Michigan Medicine from June 2010 to June 2014. Stage I resting and peak intrauterine pressure catheter measurements were obtained from fetal tracings. Multiple linear regression analyzed independent effects of demographic and labor characteristics on intrauterine pressure catheter measurements.

Results: Among 588 women with intrauterine pressure catheters, mean (SD) BMI was 33.0 (7.3) kg/m2, mean stage I resting pressure was 23.5 (8.5) mm Hg, and mean peak pressure was 68.0 (16.3) mm Hg. In multivariable models adjusted for age and race, overweight status [β 5.31 (95% CI: 2.66, 7.97)], obesity class I [5.46 (2.75, 8.17)], obesity class II [6.39 (3.54, 9.23)], obesity class III [7.19, (4.36, 10.01)], gestational age [0.10 (0.12, 0.19)], nulliparity [2.84 (0.99, 4.69)], and primiparity [3.21 (1.45, 4.97)] were correlated with increased stage I resting pressure. Only obesity class III status was associated with increased stage I peak pressure [7.30 (1.69,12.91)].

Conclusion/Implications: Resting intrauterine pressure is influenced by demographic characteristics including BMI and parity, but the same correlation was not observed for peak intrauterine pressures. Our findings highlight the need for modern labor guidelines regarding normal intrauterine pressures and their implications on labor outcomes.

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