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Case Report

A close call: does the location of incision at cesarean delivery matter in patients with vasa previa? A case report.

[version 1; peer review: 3 approved]
PUBLISHED 05 Dec 2013
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Abstract

We present here a case of vasa previa in a multipara, diagnosed at the time of her late second trimester ultrasonogram. The patient subsequently underwent an elective cesarean section after 37 weeks gestation, giving birth to a healthy child with an uneventful post-partum, neonatal and infant course. At the time of cesarean section, the incision was gradually deepened in layers through the myometrium by utmost care allowing the amniotic sac to protrude through the uterine incision hereby avoiding laceration of the vasa previa and its branches. Fetal exsanguination and a need for blood transfusion as well as a possible adverse neonatal course were therefore avoided.

Case

The CARE checklist submitted with this case report is accessible here.

A 27 year old, Caucasian gravida 4 para 3, was diagnosed with vasa previa at a 22 week anatomy scan. On ultrasound her right lateral placenta had a significant anterior component with a marginal cord insertion at the inferior margin of its anterior aspect. A vessel coursing over the internal os between the anterior placental cord insertion and a posterior succenturiate lobe was identified on ultrasound (type 2 vasa previa, see Figure 1). The patient’s antenatal course was otherwise uneventful. She was counseled for Cesarean delivery at 35–36 weeks to avoid the risk of inadvertent rupture of the vasa previa and fetal exsanguination1,2. However, she believed that considering given her past obstetrical history of post –term pregnancies and her closed long cervix, she is was less likely to go into preterm labor or sustain preterm premature rupture of membranes with a disastrous outcome secondary to vasa previa. She therefore declined hospitalization and requested delivery after 37 weeks gestation.

0892b025-7485-40c0-bec1-7f55c2a7ba11_figure1.gif

Figure 1. Doppler images showing blood flow through a vasa previa vessel over the internal os between the anterior placental cord insertion and the posterior succenturiate lobe (arrow).

Treatment

Primary low transverse Cesarean section was performed at 37 weeks and 1 day gestation as per the patient’s request. At the time of surgery, the uterine incision was gradually and carefully deepened to allow the membranes to remain intact and bulge out from the incision. This was to avoid making an incision into the amniotic sac prior to localization of the course of the vasa previa vessels in the exposed membranes underneath the uterine incision. Indeed, extensive vasa previa vessels were identified in the intact membranes directly underneath the uterine incision in the lower uterine segment (Figure 2). After identification of the vasa previa vasculature the amnion was incised about one cm away, remaining parallel to the vessel leaving these vessels intact. Additionally, hemostats were kept available to clamp the vessel on either side if possible extension of the incision into one of the vessels occurred; and followed by expeditious delivery of the baby. A healthy 2980 g male fetus was delivered with Apgar scores 9, 9 and umbilical cord artery (Ua) pH 7.3.

0892b025-7485-40c0-bec1-7f55c2a7ba11_figure2.gif

Figure 2. Amniotic sac showing presence of vasa previa vessels running in juxtaposition to the incision through which the baby was delivered, thus avoiding severance of the vessels.

The site of amnion incision (black arrows) in the vicinity of but distinct from the vasa previa vessels (yellow arrows).

Discussion

Vasa previa is a rare (1:2500) but important and potentially fatal cause of bleeding in the second and third trimester as well as in labor. The condition carries a risk of fetal exsanguination and death when rupture of the membranes involves tearing of vasa previa vessels running within the membranes and carrying fetal blood. Fortunately, the condition can often be diagnosed prenatally by ultrasound examination. Type I vasa previa refers to velamentous insertion of the cord with resultant vasa previa and Type II indicates interconnecting vessels between two lobes of placenta in a bipartite placenta or connecting vessel with a succenturiate lobe of the placenta. Nomiyama et al. identified placental cord insertion site with great degree of certainty at 18–20 weeks gestation and Sepluveda confirmed that gray scale with color Doppler has significant and better accuracy in diagnosing potential abnormal cord insertion and exclude vasa previa than 3D3,4. Situations, where vasa previa should be specifically looked for, include a larger placental mass as it is seen in multiple gestations, particularly those with a high number of fetuses, where there is a greater likelihood of velamentous insertion of the cord, succenturiate lobe or bipartite placenta. Patients with a low lying placenta, particularly if the placental margin appears at the internal os, and pregnancies conceived following in-vitro-fertilization constitute ‘at risk’ groups as well. Favorable outcomes depend on prenatal diagnosis and Cesarean delivery before the rupture of membranes. However, transection of vasa previa vessels during Cesarean delivery itself may cause significant fetal blood loss or exsanguination given the small fetal blood volume. Although the chance of fetal exsanguination during Cesarean section is less common than during vaginal delivery this complication, requiring blood transfusion to the newborn, has been reported4. This can be avoided by careful selection of the site of amniotic incision prior to delivery of the fetus. Canterino et al. recommend use of 3D sonography with power Doppler imaging with surface rendering and 3D multiplannar reconstruction to confirm vasa previa and also to map the path of this fetal vessel to prevent laceration of the vessel at cesarean section and fetal exsanguination5. According to Oylese et al., although 2D and color Doppler sonography is mostly adequate, 3D “allowed precise depiction of complex spatial relationship and confirmed vasa previa” and has an important role in placental abnormalities with uncertain diagnosis6. Vaginal ultrasonography (USG) with color Doppler is a recommended way to identify or confirm vasa previa7. In a recent case report, the authors published fetoscopic laser coagulation of a type II vasa previa at 32 5/7 weeks gestation and thereby facilitated an uneventful vaginal delivery, though the authors rightly caution benefits vs. risk of fetoscopy8. Earlier, Quintero et al. and others have published early third trimester in-utero laser treatment of type II vasa previa, however these patients had preterm delivery and needed cesarean section9,10. Although pre-op mapping of vasa previa by USG is an excellent measure to identify the course of the vasa previa vasculature, considering the recommendations made in this case report could be of additional help in the management of these patients.

Patient perspective

I would like to thank Dr. Baxi for the most professional, delicate care she provided during my pre-natal care and through the high risk cesarean section.

Consent

The patient has given written consent for publication of these findings and believes sharing of this information would benefit other patients.

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how to cite this article
Neuhausser WM and Baxi LV. A close call: does the location of incision at cesarean delivery matter in patients with vasa previa? A case report. [version 1; peer review: 3 approved]. F1000Research 2013, 2:267 (https://doi.org/10.12688/f1000research.2-267.v1)
NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article.
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Open Peer Review

Current Reviewer Status: ?
Key to Reviewer Statuses VIEW
ApprovedThe paper is scientifically sound in its current form and only minor, if any, improvements are suggested
Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit.
Not approvedFundamental flaws in the paper seriously undermine the findings and conclusions
Version 1
VERSION 1
PUBLISHED 05 Dec 2013
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11
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Reviewer Report 10 Jul 2014
Ryu Matsuoka, Department of Obstetrics and Gynecology, Showa University, Tokyo, Japan 
Approved
VIEWS 11
This is the case report of vasa previa. It was ... Continue reading
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CITE
HOW TO CITE THIS REPORT
Matsuoka R. Reviewer Report For: A close call: does the location of incision at cesarean delivery matter in patients with vasa previa? A case report. [version 1; peer review: 3 approved]. F1000Research 2013, 2:267 (https://doi.org/10.5256/f1000research.3140.r4572)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
Views
16
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Reviewer Report 16 Jun 2014
Everett F. Magann, Department of Obstetrics, University of Arkansas for Medical Sciences, Little Rock, AR, USA 
Approved
VIEWS 16
This case report is well written, insightful, and addresses the problems linked with the cesarean delivery for a vasa previa. It describes a technique to ensure the integrity of the fetal vessels located within the membranes as a cesarean delivery ... Continue reading
CITE
CITE
HOW TO CITE THIS REPORT
Magann EF. Reviewer Report For: A close call: does the location of incision at cesarean delivery matter in patients with vasa previa? A case report. [version 1; peer review: 3 approved]. F1000Research 2013, 2:267 (https://doi.org/10.5256/f1000research.3140.r5127)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
Views
21
Cite
Reviewer Report 30 Jan 2014
Conrad Chao, University of California, San Francisco, San Francisco, CA, USA 
Approved
VIEWS 21
This is an interesting case report ... Continue reading
CITE
CITE
HOW TO CITE THIS REPORT
Chao C. Reviewer Report For: A close call: does the location of incision at cesarean delivery matter in patients with vasa previa? A case report. [version 1; peer review: 3 approved]. F1000Research 2013, 2:267 (https://doi.org/10.5256/f1000research.3140.r2724)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.

Comments on this article Comments (0)

Version 1
VERSION 1 PUBLISHED 05 Dec 2013
Comment
Alongside their report, reviewers assign a status to the article:
Approved - the paper is scientifically sound in its current form and only minor, if any, improvements are suggested
Approved with reservations - A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit.
Not approved - fundamental flaws in the paper seriously undermine the findings and conclusions
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