Uterine contractility at delivery and in the puerperium

In 27 women, uterine activity in the third stage of labour was correlated with blood loss measured quantitatively during the same period of time. Myometrial activity was reflected by total intrauterine pressures measured using a Gaeltec® catheter tipped pressure transducer inserted transcervically within 5 min of delivery of the placenta. Blood loss over the same 2-hour period was collected on absorbent paper and measured in the laboratory by colorimetric measurement of the haemoglobin content. As total uterine activity in the third stage of labour decreases total blood loss increases, but there is a poor correlation of uterine activity to total blood loss over the same period of time, probably because of biological variations in myometrial activity in normal women.

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“…It is generally accepted that intrauterine pressure measurement in the third stage of labour reflects myométrial activity [6,7].…”

Section: Discussionmentioning

confidence: 99%

Correlation of Total Uterine Activity to Blood Loss in the Third Stage of Labour

Chua

Arulkumaran²,

Roy³

et al. 1996

Gynecol Obstet Invest

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“…There were no complications like infection or perforation of the uterus. From the recordings, it was possible to reliably and safely quantify the uterine activity in the third stage of labour [6,[8][9][10][11]. Thus intrauterine pressure measurements may be used as a measure of uterine contractility and thus indirectly as a measurement of the efficacy of uterotonic agents to prevent excessive blood loss in the third stage of labour.…”

Section: Discussionmentioning

confidence: 99%

“…Hence measurements of myometrial activity could be used to reflect the blood loss during the same period. It has generally been accepted that intrauterine pressure measurement in the third stage of labour reflects myometrial activity [8,9].…”

Section: Discussionmentioning

confidence: 99%

Correlation of Change in Uterine Activity to Blood Loss in theThird Stage of Labour

Choo

Chua

Chong

et al. 1998

Gynecol Obstet Invest

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In 47 women, the change in the uterine activity after the administration of a uterotonic agent was correlated with the amount of blood loss during the same period of time. Uterine activity was measured by a Gaeltec^® catheter-tipped pressure transducer inserted transcervically within 5 min of delivery of the placenta. A uterotonic agent (either intravenous syntocinon, intramuscular syntometrine or oral misoprostol) was given after the insertion of the intrauterine pressure catheter and pressure recorded for another 90 min. Blood loss over the same 2-hour period was collected with absorbent paper which was then assessed by colorimetric measurement of the haemoglobin content in the sample. Our results show that the change in uterine activity is associated with the total blood loss. However, there is a poor linear correlation between the two variables probably because of the biological variation in myometrial activity and differences in coagulation mechanisms in normal women.

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“…Just as the uterus needs to 'evolve' into active clinical labor, it must begin the 'devolution' out of labor ( fig. 8) [4], At first, the postpartum contractions appear very similar in form and other characteristics to those observed in active labor; then they slowly decrease in frequency and gradually lose the simple elegant and efficient form characteristic of active labor. The fact that parturition can occur with an absolute minimum of blood loss postpartum, in spite of a tonus between contractions no greater than that seen during normal labor, speaks for the ability of the uterus to control the process of parturition without endangering the life of the mother.…”

Section: Normal Labor Anil Evidence For Inherent Controlmentioning

confidence: 99%

“…What aspects of labor can the physician hope to control? 4. At what point should the physician exercise the control of which he is capable?…”

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confidence: 99%

The Control of Labor

Hendricks¹

1970

Gynecol Obstet Invest

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Uterine contractility at delivery and in the puerperium

Cited by 45 publications

References 4 publications

Correlation of Total Uterine Activity to Blood Loss in the Third Stage of Labour

Correlation of Total Uterine Activity to Blood Loss in the Third Stage of Labour

Correlation of Change in Uterine Activity to Blood Loss in theThird Stage of Labour

The Control of Labor

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