Placenta accreta occurs when the decidua basalis that normally separates the anchoring villi and the myometrium is missing  . The incidence of placenta accreta appears to be increasing until 1980s  . For the period of 1982-2002, researchers have reported the incidence of placenta accreta as 1 in 533 deliveries  . In 2006, the incidence increased to be 1 in 210 deliveries  . The pathogenesis of placenta accreta is not known with certainty. The most common theory is defective decidualization (thin, poorly formed, or absent decidua) related to previous surgery or to anatomical factors (endocervix, lower uterine 2 segment, endosalpinx, uterine anomaly) allows the placenta to attach directly to the myometrium   . The most important risk factor for placenta accreta is placenta previa after a prior cesarean delivery. Other risk factors for placenta accreta include: uterine instrumentation, intrauterine scarring, smoking, maternal age over 35, grand multiparity, and recurrent miscarriage   . The first clinical manifestation of placenta accreta is usually profuse, life-threatening hemorrhage that occurs at the time of attempted manual placental separation. Poorly controlled hemorrhage related to placenta accreta, increta and percreta is the indication for one to two thirds of peripartum hysterectomies  , disseminated intravascular coagulopathy, adult respiratory distress syndrome, renal failure, unplanned surgery, and death  . The diagnosis is made by (2D) gray scale ultrasound, three dimentional ultrasound, color doppler ultrasound and magnetic resonance imaging  . The timing of delivery in cases of suspected placenta accreta is preterm elective CS at 35 - 36 weeks  . Generally, the recommended management of suspected placenta accreta is planned preterm cesarean hysterectomy with the placenta left in situ because removal of the placenta is associated with significant hemorrhagic morbidity  . Women who have a strong desire for future fertility uterine sparing approaches may be used as methotrexate, local resection of placental implantation site, systematic pelvic devascularization, uterine tamponade, and interventional radiology with internal iliac artery ligation, but these approaches may complicated by sepsis, hemorrhage  , and hysterectomy can become necessary.
2. Patients and Methods
- Patients with ultrasound signs suggestive of placenta accrete (vascular lacunae, myometrial thinning, and loss of the retroplacental “clear space” and interruption of bladder line).
- Patients with previous cesarean section with placenta implanted over the scar.
- MRI signs of placenta accrete (uterine bulging and loss of normal uterine contour, on T2 weighted MR images, presence of hyperintense mass which may be heterogeneous, focal thinning of the myometrium and interruption of the junctional zone).
Patients with average gestational age below 28 weeks will be excluded. All cases will be subjected to thorough history taking, complete general examination, and investigations. Documentation of interventions performed, maternal outcome, and fetal outcome.
Ultrasound scanners with linear and sectorial 3.5 and 5 MHz transducers and also 5 and 7 MHz transvaginal transducers were employed, by GE Voluson 730 Expert and Voluson E8. Ultrasound results were retrospectively analyzed and compared with surgical findings. The degree of placental penetration and its specific topography were established in the operating room according to clinical and anatomical criteria.
The incidence of placenta accrete was 1 in 75 cesarean deliveries (Table 1, Figure 1). The mean age of included women with placenta previa was 26.7 ± 4.9 years (range: 21 - 32 years). The mean gestational age at delivery was 33.8 ± 4.6 weeks’ gestation (range: 29 - 39 weeks’ gestation) (Table 2). The median parity was 3 (range: 1 - 5; interquartile range: 2 - 4). All the included cases had at least one previous CS (Table 3).
Table 1. Incidence of morbidly-adherent placenta previa cases in relation to total no. of cesarean deliveries during the studied period (n = 44).
Table 2. Demographic data of women with morbidly-adherent placenta previa during the studied period.
Table 3. No. of previous CS in women with morbidly-adherent placenta previa during the studied period (n = 44).
Figure 1. Placenta accrete during cesarean deliveries.
3 Of the included 44 women with morbidly-adherent placenta previa (Figure 2, Figure 3), 24 (54.6%) presented with antepartum hemorrhage (Table 4). Antenatal ultrasonography was suggestive of placenta accreta in only 20 cases (resulting in a false negative rate of 54.6%) (Table 5). Intraoperatively, balloon catheterization was placed in 0 cases (0%). Uterine artery ligation was performed in 24 (54.5%) cases, and internal iliac artery ligation in 4 (9.1%) cases. Hysterectomy was performed in 15 (34.1%) cases, only 3 (6.8%) were total hysterectomy. Bladder injury was encountered in 9 (20.5%) cases. compression sutures were performed in 28 (63.6%) cases (Table 6). The median estimated intraoperative blood loss was 2.5 L (range: 1 - 5 L; interquartile range: 2 - 3 L). The overall rate of blood transfusion in included women was 35/44 (79.6%). The median was 3 units (range: 1 - 5 units; interquartile range: 2 - 4 units). The overall rate of FFP transfusion was 35/44 (79.6%). The median was 3 units (range: 1 - 5 units; interquartile range: 1 - 4 units). Only 1 (2.3%) woman received platelet transfusion and only 1 (2.3%) woman received cryoprecipitate transfusion (Table 7).
4 Of the included 44 women, 3 (6.8%) developed DIC, 12 (27.3%) were admitted to ICU postoperatively, Only 1 (2.3%) patient readmitted because of developing postoperative collection. 3 (6.8%) were re-operated upon (for postpartum collapse and intraabdominal bleeding). Like one case of maternal death (Table 8). The median hospital stay after delivery was 3 days (range: 2 - 5 days; interquartile range: 2.5 - 4 days). Of the included 44 neonates, 23 (52.3%) were males, while 21 (47.7%) were females. The median birth weight was 2734 g (range: 700 - 4500 g; interquartile range: 1388 - 3605 g). The median 1-min Apgar score was 4 (range: 1 - 9; interquartile range: 3 - 7). The median 5-min Apgar score was 5 (range: 3 - 9; IQR: 4 - 7) (Table 9).
Over a 6 months period there were 3300 cesarean deliveries and a 44 cases diag-
Figure 2. Morbidly-adherent placenta previa.
Figure 3. Morbidly-adherent placenta previa.
Table 4. APH as the presenting complaint in included women with morbidlyadherent placenta previa during the studied period (n = 44).
Table 5. Sonographic prediction of morbid placental adherence in included women with morbidly-adherent placenta previa (n = 44).
nosed as having placenta accreta. The incidence of placenta accreta was 1/75 cesarean deliveries. Compared with the literature which reports that the incidence of placenta accreta in 2006 was 1/210 deliveries  . The incidence of placenta accreta at El-Shatby Maternity University Hospital is increased because it’s a tertiary referral centre for three governorates. In our study all the included cases had at least one previous CS, numbers of patients with placenta previa and a history
Table 6. Surgical management and intraoperative findings in included women with morbidly-adherent placenta previa (n = 44).
Table 7. Estimated intraoperative blood loss and blood transfusion in included women with morbidly-adherent placenta previa during the studied period (n = 44).
Table 8. Postoperative findings in included women with morbidly-adherent placenta (n = 44).
of one, two, three, four and five cesarean section delivery were 7%, 29.6%, 36.4%, 18.2%, 13.6% and 2.3% cases, respectively. None of patients was with a history of more than five cesarean section delivery. Of the 44 patients in the current study, the mean age of included women with morbidly adherent placenta was
Table 9. Neonatal Outcome in Included Women with Morbidly-Adherent Placenta (n = 44).
26.7 ± 4.9 years (range: 21 - 32 years). Of the included 44 women with morbidly-adherent placenta previa, 24 (54.6%) presented with APH. According to the current study the antenatal ultrasonography and doppler was suggestive of morbid adherence in only 20 cases (resulting in a false negative rate of 54.6% and a sensitivity of 45.5%). This may be due to the fact that most ultrasonic examinations were performed by emergency department doctors with limited experience. Although there still appears to be a difference of opinion in the literature regarding the accuracy of ultrasound for the diagnosis of placenta accrete. With the exception of the Lam study who reports a sensitivity of 33%  , all other studies report a sensitivity of 77% - 93%   . Morbidity from placenta accreta is caused by problems associated with massive bleeding. In the present study, the median estimated intraoperative blood loss was 2.5 L (range: 1 - 5 L; IQR: 2 - 3 L). The overall rate of blood transfusion in included women was 35/44 (79.6.8%) (range: 1 - 5 units). The overall rate of FFP transfusion was 35/96 (79.6%) (range: 1 - 5 units). Only 1 (2.3%) woman received platelet transfusion and only 1 (2.3%) woman received cryoprecipitate transfusion. The present findings are similar to other reported rates of transfusion. For example a more recent study, which analyzed 99 placenta accreta cases, found that approximately 75% required blood transfusion with a mean of 5.4 ± 2.1 units of RBCs  . Thus, blood transfusion should be anticipated, and massive transfusion is not rare in these obstetric patients. Other causes of early morbidity (coagulopathy, admission to the intensive care units, bladder injury & early reoperation) are also high in patients with placenta accreta, as reported in previous study  . In the current study 3 of the 44 patients had DIC and admitted to the ICU (6.8%), 12 were admitted to ICU postoperatively. The duration of ICU admission ranges from 2 to 5 days. In terms of maternal morbidity, 15 cases (34.1%) underwent a cesarean hysterectomy. Three of them were through total hysterectomy while the majority (9 cases) was by subtotal hysterectomy. Uterine preserving procedures included in 32 cases, 24 cases by uterine artery ligation, 4 cases of the 24 cases accompanied by internal iliac artery ligation, and 28 cases by compression sutures. Of the 44 patients, 1 case required readmission because better care in our hospital, complaining of post-operative collection, 3 cases needed reoperation (2 cases to control bleeding while the third with a missed bladder injury). Maternal mortality has been reported in up to 7% of cases  . In the current study there were one maternal death (2.7%) because better care in our hospital. In cases of placenta accreta the incidence of perinatal complications is also increased mainly due to preterm birth and small for gestational age fetuses  . In the present study, the mean gestational age at delivery was 33.8 ± 4.6 weeks’ gestation (range: 29 - 39 weeks’ gestation). The median birth weight was 2800 g (range: 700 - 4500 g; IQR: 1388 - 3605 g). James et al., reported that the sex ratio associated with placenta accreta favors females  . In the present study, of the included 44 neonates, 23 (52.3%) were males, while 21 (47.7%) were females. So, the result of the current study is opposite to the result of the previous literature. The median 1-min Apgar score was 4 (range: 1 - 9; IQR: 3 - 7) and median 5-min Apgar score was 5 (range: 3 - 9; IQR: 4 - 7). 14 infants were admitted to the neonatal intensive care unit (NICU). Neonatal outcome in the current study was uniformly good according to median birth weight and the median 5-min Apgar score.
 Esh-Broder, E., Ariel, I., Abas-Bashir, N., Bdolah, Y. and Celnikier, D.H. (2011) Placenta Accreta Is Associated with IVF Pregnancies: A Retrospective Chart Review. International Journal of Obstetrics and Gynaecology, 118, 1084-1089.
 Wu, S., Kocherginsky, M. and Hibbard, J.U. (2005) Abnormal Placentation: Twenty-Year Analysis. American Journal of Obstetrics & Gynecology, 192, 1458-1461.
 Tantbirojn, P., Crum, C.P. and Parast, M.M. (2008) Pathophysiology of Placenta Creta: The Role of Decidua and Extravillous Trophoblast. Placenta, 29, 639.
 Glaze, S., Ekwalanga, P., Roberts, G., Lange, I., Birch, C., Rosengarten, A., et al. (2008) Peripartum Hysterectomy: 1999 to 2006. Obstetrics & Gynecology, 111, 732.
 Shih, J.C., Palacios, J.J.M., Su, Y.N., Shyu, M.K., Lin, C.H., Lin, S.Y., et al. (2009) Role of Three-Dimensional Power Doppler in the Antenatal Diagnosis of Placenta Accreta: Comparison with Gray Scale and Color Doppler Techniques. Ultrasound in Obstetrics & Gynecology, 33, 193.
 Royal College of Obstetricians and Gynaecologists (2011) Placenta Praevia, Placenta Praeviaaccreta and Vasa Praevia: Diagnosis and Management.
 Butt, K., Gagnon, A. and Delisle, M.F. (2002) Failure of Methotrexate and Internal Iliac Balloon Catheterization to Manage Placenta Percreta. Obstetrics & Gynecology, 99, 981-982.
 Lam, G., Kuller, J. and McMahon, M. (2002) Use of Magnetic Resonance Imaging and Ultrasound in the Antenatal Diagnosis of Placenta Accreta. Journal of the Society for Gynecologic Investigation, 9, 37-40.
 Warshak, C.R., Eskander, R., Hull, A.D., Scioscia, A.L., Mattrey, R.F., Benirschke, K., et al. (2006) Accuracy of Ultrasonography and Magnetic Resonance Imaging in the Diagnosis of Placenta Accreta. Obstetrics & Gynecology, 108, 573-581.
 Warshak, C.R., Ramos, G.A., Eskander, R., Benirschke, K., Saenz, C.C., Kelly, T.F., et al. (2010) Effect of Predelivery Diagnosis in 99 Consecutive Cases of Placenta Accreta. Obstetrics & Gynecology, 115, 65.
 Cooper, A.C. ((2012) The Rate of Placenta Accreta and Previous Exposure to Uterine Surgery.