Abdominal and pelvic ultrasound findings within 24 hours following uneventful Cesarean section

Ultrasound in labor: clinical practice guideline and recommendation by the WAPM-World Association of Perinatal Medicine and the PMF-Perinatal Medicine Foundation

This recommendation document follows the mission of the World Association of Perinatal Medicine in collaboration with the Perinatal Medicine Foundation. We aim to bring together groups and individuals throughout the world for standardization to implement the ultrasound evaluation in labor ward and improve the clinical management of labor. Ultrasound in labor can be performed using a transabdominal or a transperineal approach depending upon which parameters are being assessed. During transabdominal imaging, fetal anatomy, presentation, liquor volume, and placental localization can be determined. The transperineal images depict images of the fetal head in which calculations to determine a proposed fetal head station can be made.

Ultrasound evaluation of the uterus in the uncomplicated postpartum period: a systematic review

OBJECTIVE

The aim of this systematic review and meta-analysis was to define the means and the upper limits of normal for endometrial thickness and uterine measurements in uncomplicated pregnancies at different postpartum periods.

DATA SOURCES

A search was conducted in the Medline, Embase, Cinahl, and Clinicaltrials.gov databases up to January 30, 2020.

STUDY ELIGIBILITY CRITERIA

We included studies reporting sonographic parameters of the uterus in the normal postpartum period.

METHODS

The continuous variables were expressed as means with standard deviations. The upper limits of normal were defined as the 95th percentile. Clinically significant differences in the uterine measurements between subgroups were defined as ≥2 cm; significant differences in the uterine volume were defined as >10%. The primary outcome was the endometrial thickness; others sonographic parameters that were analyzed were the uterine anteroposterior diameter, longitudinal diameter, width, and volume.

RESULTS

A total of 5260 articles were identified. Of these, 80 were assessed for their eligibility for inclusion and 32 studies were included in this systematic review. These studies included 3106 women (55% multiparas and 82% with vaginal deliveries) who underwent transabdominal and/or transvaginal ultrasound from the first postpartum day to a maximum of 6 weeks postpartum. The upper limit of normal (95th percentile) for the endometrial thickness was 25 mm by 7 days postpartum and this continued to decrease (18 mm at 14 days, 12 mm at 4 weeks, and 9 mm at 6 weeks) in a similar manner for all the women regardless of parity or mode of delivery. All the other uterine measurements also gradually decreased during the puerperium for all the women regardless of parity or mode of delivery.

CONCLUSION

These upper limits of normal for the postpartum endometrium and uterine measurements in uncomplicated pregnancies provide clinical guidance for the sonographic evaluation of women with complicated postpartum courses.

Risk factors and clinical significance of abdomino-pelvic free fluid after cesarean section: a prospective study

Introduction: Post-partum hemorrhage is a major cause of maternal mortality. Ultrasonography is a safe, rapid, and noninvasive diagnostic tool which can be used to identify and measure the abdomino-pelvic free fluid in post-partum period.Objective: This study was conducted to evaluate the risk factors and clinical significance of abdomino-pelvic free fluid after cesarean section.Method: Demographic data, indication of cesarean section, duration of operation, volume of intraoperative blood loss, and instability in vital signs, blood transfusion, decreased Hb level, and decreased urine output were documented in 100 women with cesarean delivery 4 and 24 h after surgery. Abdomino-pelvic free fluid volume was estimated by ultrasound study.Result: Four hours after cesarean, minimal, moderate, and large amount of free fluid was seen in 38(38%), 45(45%), and 17(17%) patients respectively. The volume of free fluid was decreased generally as 73 (73%) of patients had minimal amount of free fluid 24 h after surgery. There was statistically significant relationship between volume of blood loss during cesarean and the volume of free fluid 4 h (and not 24 h) after surgery. There was no statistically significant relationship between duration of operation and the volume of free fluid 4 and 24 h after cesarean. There is statistically significant relationship between free fluid volume 4 h after surgery and hemodynamic instability.Conclusion: Ultrasonography detects even minimal amount of free fluid in post-cesarean patients but cannot predict their clinical course.

Comparison of postpartum sonographic findings after uneventful vaginal and cesarean section deliveries

Objective: To prospectively determine the sonographic findings of the postpartum uterus 24 hours after vaginal delivery and cesarean section. Methods: Women who had uneventful vaginal delivery or cesarean section from July 2015 to May 2018 in a tertiary care hospital were prospectively included. Uterine lengths, endometrium, amout of free fluid, the distance between the uterine fundus-promontorium and uterine fundus-L5 were evaluated 24 hours after delivery. Results: The mean (min-max) endometrial thickness in the vaginal delivery and cesarean section groups were 13.3 (4-25) and 12.4 (4-29) mm, respectively. Fundus-cervix length was significantly higher in the vaginal delivery group compared to the cesarean section group (184.05 ± 16.8 vs 163.6 ± 6.7 mm, p <0.001). The measurements of anterior and anterior-posterior walls of the uterus, anteroposterior uterine length and uterine width were similar in both groups. Promontorium-fundus length was significantly higher in patients who delivered vaginally than those by cesarean section (123.3 ± 13.6 vs 108.7 ± 23.3 mm, p = 0.005). Conclusion: The measurement of L5-fundus distance is a simple and effective technique to evaluate the size of the uterus. Homogenous endometrium up to 30 mm in asymptomatic patients may be a normal finding 24 hours after delivery. The results of this study may be helpful in the decision-making process in cases of early postpartum hemorrhage or hemodynamic instability.

Objective: To prospectively determine the sonographic findings of the postpartum uterus 24 hours after vaginal delivery and cesarean section. Methods: Women who had uneventful vaginal delivery or cesarean section from July 2015 to May 2018 in a tertiary care hospital were prospectively included. Uterine lengths, endometrium, amout of free fluid, the distance between the uterine fundus-promontorium and uterine fundus-L5 were evaluated 24 hours after delivery. Results: The mean (min–max) endometrial thickness in the vaginal delivery and cesarean section groups were 13.3 (4–25) and 12.4 (4–29) mm, respectively. Fundus-cervix length was significantly higher in the vaginal delivery group compared to the cesarean section group (184.05 ± 16.8 vs 163.6 ± 6.7 mm, p <0.001). The measurements of anterior and anterior-posterior walls of the uterus, anteroposterior uterine length and uterine width were similar in both groups. Promontorium-fundus length was significantly higher in patients who delivered vaginally than those by cesarean section (123.3 ± 13.6 vs 108.7 ± 23.3 mm, p = 0.005). Conclusion: The measurement of L5-fundus distance is a simple and effective technique to evaluate the size of the uterus. Homogenous endometrium up to 30 mm in asymptomatic patients may be a normal finding 24 hours after delivery. The results of this study may be helpful in the decision-making process in cases of early postpartum hemorrhage or hemodynamic instability.

Evaluating the Endometrial Hyperechoic Zone in Early Postpartum Women May Be Deceptive When Utilizing Transcutaneous Sonography

The objective of this study was to investigate the concordance of measurements for early postpartum endometrial thickness between magnetic resonance imaging (MRI) and transcutaneous diagnostic medical sonography (DMS) as well as its implications. The measurements of early postpartum endometrial thickness were reviewed across 51 postpartum women who underwent MRI and transcutaneous DMS. Additionally, 30 women with a normal menstrual cycle formed a control group, and their data were compared. The results indicated that the endometrial thickness at early postpartum was 4.63 ± 0.62 mm on MRI and 8.18 ± 4.70 mm on DMS, with a comparative significant difference ( P < .001). The endometrial thickness of the control group was 10.02 ± 1.71 mm on MRI and 10.17 ± 1.81 mm on DMS with no comparative significant difference ( P = .124). This cohort study questions whether the hyperechoic zone in the early postpartum uterine cavity represents the actual endometrial thickness. Care should be taken by sonographers in labeling the hyperechoic zone in the early postpartum stage as endometrium.

The postpartum ultrasound scan

Ultrasound assessment of the postpartum uterus has a significant role to play in the evaluation of a large proportion of symptomatic puerperal women. Often the imaging modality of choice for excluding retained placental tissue, correct application of postpartum ultrasound could enable more accurate identification of women requiring surgical intervention, with consequent reduction in patient morbidity and clinical workload. This article aims to review the current understanding and application of ultrasound in the puerperium and evaluate the current evidence investigating the physiological and pathological findings of the postpartum uterus and its contents.

Sonographic evaluation for intra-abdominal hemorrhage after cesarean delivery

PURPOSE

To evaluate whether intra-abdominal hemorrhage is visible on a modified focused assessment with sonography for trauma (FAST) examination in stable obstetrics patients after a nonemergent cesarean delivery.

METHODS

This was a prospective observational study of patients who underwent nonemergent cesarean delivery at a single institution. Patients provided written informed consent to participate in the study preoperatively and underwent a modified FAST examination in the recovery room within 2 hours of completion of surgery. A sonographic examination was considered positive for hemorrhage if an anechoic pocket consistent with free fluid was present.

RESULTS

One hundred patients underwent suprapubic and bilateral upper-quadrant sonographic evaluations. The mean (±SD) time of the evaluation was 74.2 ± 36 minutes after the end of surgery. Among the 100 sonographic examinations of each upper quadrant, 194 (97.0%) were negative, 5 (2.5%) were indeterminate, and 1 (0.5%) was positive for fluid. All suprapubic sonographic examinations were considered inadequate.

CONCLUSIONS

Sonographic evaluation immediately after cesarean delivery is feasible in most patients and was overwhelmingly negative for intra-abdominal hemorrhage in a group of patients who did not require reoperation or unexpected blood transfusion.

[Ultrasound appearance of the area of uterine closure in asymptomatic patients at 48 hours of uneventful cesarean section]

OBJECTIVE

It seeks to assess the appearance of the hysterorrhaphy area and seeks hematoma in asymptomatic patients at 48hours of their cesarean.

METHOD

It is common to see, ultrasound or CT scan, collection of images next to the hysterorrhaphy area in symptomatic patients after cesarean. Their interpretation remains difficult which led us to propose a prospective study looking for an evocative image collection or hematoma in asymptomatic patients at 48hours of their cesarean. It was directed suprapubic and transvaginal pelvic ultrasound with study area hysterorrhaphy and inter-uterine bladder space.

RESULTS

The suprapubic ultrasound examination was performed in 31 asymptomatic patients after collecting their written consent. Twenty-eight patients also received an endovaginal examination. The studied area was easily identified by visualizing the path of hysterotomy and hyperechoic aspect of the hysterorrhaphy. In 28 cases there were no abnormal image in front of the hysterorrhaphy area. In 3 cases, an evocative image of a haematic collection was displayed and measured a maximum of only 49mm long axis with a weak Doppler signal. The exam was very well tolerated by patients, especially by transvaginal route. Also the duration of ultrasound never exceeded 58seconds and remained fastest vaginally.

CONCLUSION

This preliminary work to a prospective double cohort (symptomatic patients and asymptomatic patients) has clarified the technique to use and focus in the search for a collection next to the hysterorrhaphy area. Ultrasound examination postoperatively, especially vaginally, is very fast, well tolerated with satisfactory image quality. Finally in this cohort of asymptomatic patients, it was very unusual for a collection, confirming the credit to be given to this type of image in case of symptoms after cesarean.

Added value of 3-dimensional sonography for endometrial evaluation in early puerperium

OBJECTIVES

The purpose of this study was to examine the uterine cavity within 48 hours of delivery using 2- and 3-dimensional sonography after normal vaginal deliveries, instrumental deliveries, exploration of the uterine cavity, and cesarean deliveries.

METHODS

A prospective study was performed in puerperal women with normal clinical examination findings. Measurements of the uterine length and width were taken in the midsagittal and coronal planes. Midsagittal measurements of the endometrium using 2- and 3-dimensional sonography and virtual organ computer-aided analysis were performed. Comparisons were made between normal and surgical vaginal deliveries, cesarean deliveries, and after exploration of the uterine cavity.

RESULTS

A total of 123 patients were examined. Seventy-seven patients had normal vaginal deliveries; 21 had assisted vaginal deliveries; and 25 had cesarean deliveries. Thirteen underwent exploration of the uterine cavity. The uterine volume increased significantly as the birth weight increased and after cesarean delivery (P < .05). No correlation was found between the endometrial volume and parity, birth weight, and mode of delivery, including no correlation with exploration. Five cases of placental residua were found in asymptomatic women. All delivered vaginally. None underwent exploration of the uterus. All had irregular echogenic masses in the uterine cavity with positive color Doppler findings. The endometrial thickness and volume were significantly higher in these patients.

CONCLUSIONS

Sonography along with Doppler assessment has added value in the clinical evaluation of the puerperal women, being able to also show residua in asymptomatic women. Three-dimensional sonography did not show an advantage over 2-dimensional sonography in the estimation of the puerperal uterus or residua.

Routine use of abdominopelvic ultrasonography in severe postpartum hemorrhage: retrospective evaluation in 125 patients

OBJECTIVE

The purpose of this study was to analyze the potential of abdominopelvic ultrasonography at the initial examination in women with severe postpartum hemorrhage.

STUDY DESIGN

One hundred twenty-five women were included in the study. The therapeutic approaches that were performed to stop the bleeding were evaluated for each category of ultrasonographic finding.

RESULTS

Seventy-one women (56.8%) had normal ultrasonography; 30 women (24%) had echogenic endometrial lining; 17 women (13.6%) had echogenic intrauterine mass, and 7 women (5.6%) had abdominopelvic free fluid effusion. Medical therapies allowed the bleeding to stop in 90.1% of women with normal ultrasonography, in 66.6% of women with echogenic endometrial lining, and in 29.4% of women with echogenic intrauterine mass. Pelvic embolization and surgery were performed less frequently in women who had normal ultrasonography results (9.9%) than in women with abnormal ultrasonography results (46.8%; P < .0001).

CONCLUSION

A normal abdominopelvic ultrasonography is associated with a favorable outcome and can be considered to be a predictor for the effectiveness of conservative, noninvasive therapeutic approaches.