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Table 1 Profile of studies entered into systematic review and meta-analysis

From: The effect prophylactic internal iliac artery balloon occlusion in patients with placenta previa or placental accreta spectrum: a systematic review and meta‐analysis

Author, year, Reference Country Type placenta Variable Balloon occlusion group Control group p-value
Yu SCH, 2020, [26] Hong Kong previa Maternal age (years) 35.3 [31.5-37.6] 36.6 [32.7-39.1] -
Sample size (n) 20 20 -
Intraoperative blood loss (mL) 1451 [1024-2388] 1454 [888-2300] 0.945
Blood transfusion (units) 0.5 [0-2.75] 2 [0-4] 0.55
Gestation (weeks) 36.6 [35.2-37.2] 36.1 [34.8-37.7] 0.968
Hysterectomy (%) 0.0 0.0 -
Sallam, 2018, [27] Egypt previa Maternal age (years) 29.71±2.84 29.68± 2.53 -
Sample size (n) 62 62 -
Intraoperative blood loss (mL) 1151.61±246.38 1800±980 0.0001
Gestation (weeks) 35.55±0.77 35.58±0.62 0.977
Darwish, 2014, [28] Egypt previa Maternal age (years) 33.8 33.5 -
Sample size (n) 32 32 -
Intraoperative blood loss (mL) 1900 2800 0.019
Blood transfusion (units) 2.9 4.7 0.142
Gestation (weeks) 35.6 34.3 0.008
Omar, 2017, [29] Egypt previa Maternal age (years) 34.7±6.8 33.1±5.9 -
Sample size (n) 20 20 -
Intraoperative blood loss (mL) 1076±545 1664±647 <0.001
Blood transfusion (units) 2 4 0.13
Hysterectomy (%) 5 10 0.41
Jiang, 2013, [30] China previa Sample size (n) 13 28 -
Intraoperative blood loss (mL) 1429±875 4600± 2090 0.000
Blood transfusion volume (ml) 920±438 3600± 1225 0.000
Hysterectomy (%) 84.61 89.28 0.670
Broekman, 2015, [31] Netherlands previa Maternal age (years) 32.6 ± 4.3 34.1 ± 3.7 -
Sample size (n) 42 26 -
Intraoperative blood loss (mL) 800 (488–1113) 1000 (694–1307) 0.06
Blood transfusion (units) 4 6  
Gestation (weeks) 37 (36-38) 37(35-38) 0.16
Mei, 2018, [32] China previa Sample size (n) 20 12 -
Intraoperative blood loss (mL) 800 (500-1800) 1875 (500-7600) 0.01
Hysterectomy (%) 0.0 8.3 <0.01
Soyama, 2017, [33] Germany previa Maternal age (years) 35 (27–42) 34 (19–43) -
Sample size (n) 50 216 -
Intraoperative blood loss (mL) 979 (287–2369) 2189 (2133–3360) <0.01
Gestation (weeks) 36 (30-38) 37 (30-38) 0.87
Fan, 2017, [34] China previa Maternal age (years) 32.6±0.6 32.0±0.4 -
Sample size (n) 74 89 -
Intraoperative blood loss (mL) 1236.0±138.2 1694.0±144.3 0.01
Blood transfusion volume (ml) 728.0±113.6 1205.0±138.7 0.01
Gestation (weeks) 36.5±0.1 36.4±0.2 0.65
Hysterectomy (%) 2.7 5.6 0.36
Dai, 2018, [35] China previa Sample size (n) 42 20 -
Intraoperative blood loss (mL) 2900.00 ± 2352.21 4549.77 ± 2366.67 0.025
Blood transfusion (units) 8.40 ± 7.14 13.00 ± 7.93 0.018
Hysterectomy (%) 2.3 35 0.027
Ono, 2018, [36] Japan previa Maternal age (years) 33.7±3.8 34.0±3.9 -
Sample size (n) 29 13 -
Intraoperative blood loss (mL) 2027.1±1637.6 3786.7±2936.1 <0.01
Gestation (weeks) 34.8±1.5 35±2.2 <0.01
Bodner, 2006, [37] USA previa Maternal age (years) 35.3 35.3 -
Sample size (n) 6 22 -
Intraoperative blood loss (mL) 2600 2800 0.4
Blood transfusion (units) 6.3 6.5 0.47
Gestation (weeks) 32.5 36.5 0.019
Picel, 2018, [38] USA previa Sample size (n) 61 90 -
Intraoperative blood loss (mL) 2000 (1500-2500) 2500 (2000-4000) 0.002
Blood transfusion (units) 2 (0-5) 5 (2-8) 0.002
Wang, 2017, [39] China previa Sample size (n) 10 43 -
Intraoperative blood loss (mL) 1000 2000 <0.05
Hysterectomy (%) 10 63.3 <0.05
Peng, 2020, [40] China previa Maternal age (years) 32.08 ± 3.94 33.46 ± 4.53 -
Sample size (n) 48 56 -
Intraoperative blood loss (mL) 690.00 ± 226.88 887.10 ± 311.71 0.018
Blood transfusion volume (ml) 970.54 ± 1083.21 1352.08 ± 1211.03 0.093
Gestation (weeks) 35.57 ± 1.97 36.05 ± 1.66 0.177
    Hysterectomy (%) 12.5 29.2 0.035
El-sayed, 2016, [41] Egypt previa Maternal age (years) 33.54±4.36 33.62± 3.86 -
Sample size (n) 50 50 -
Intraoperative blood loss (mL) 850±20 1120±70 0.000
Blood transfusion (units) 1.8 ± 0.4 2.1 ± 0.5 0.001
Hysterectomy (%) 10 12 -
Wu, 2016, [42] China previa Maternal age (years) 29.5±3.6 30.4±4.0 -
Sample size (n) 230 38 -
Intraoperative blood loss (mL) 921±199 2790±335 0.000
Blood transfusion volume (ml) 422±58 1580±67 0.000
Gestation (weeks) 35.6±1.3 35.5±1.5 0.595
Hysterectomy (%) 0.0 7.89 0.003
Feng, 2017, [43] China Accreta Maternal age (years) 31.8±5.6 32.5±5.7 -
Sample size (n) 30 11 -
Intraoperative blood loss (mL) 1000(600-2500) 1100(800-2600) 0.64
Blood transfusion (units) 0(0-6) 3(0-8) 0.67
Gestation (weeks) 37 (36-37.28) 37.42(36.28-39) 0.069
Li, 2018, [44] China Accreta/Increta/Percreta Maternal age (years) 34.53 ± 5.80 33.43 ± 4.32 -
Sample size (n) 112 87 -
Intraoperative blood loss (mL) 1850±490 3800±560 <0.001
Blood transfusion volume (ml) 480±220 2000±1120 <0.001
Gestation (weeks) 37.02 ± 1.3 36.78 ± 1.38 0.273
Hysterectomy (%) 11.61 32.18 <0.001
Cali, 2014, [45] Italy Accreta/Increta/Percreta Sample size (n) 30 23 -
Intraoperative blood loss (mL) 846.67±280.06 1156.52±576.69 0.036
Blood transfusion volume (ml) 470±860 1960±246 0.011
Dai, 2020, [46] China Accreta/Increta/Percreta Maternal age (years) 34.08 ± 4.75 32.59 ± 4.10 -
Sample size (n) 51 27 -
Intraoperative blood loss (mL) 1846 ± 2187 3717 ± 2717 <0.001
Blood transfusion (units) 5.65 ± 5.71 11.48 ± 8.72 <0.001
Gestation (weeks) 34.94 ± 1.49 34.07 ± 4.19 0.178
Hysterectomy (%) 2 11.1 0.081
Chou, 2015, [47] Taiwan Accreta/Increta/Percreta Sample size (n) 13 11 -
Intraoperative blood loss (mL) 1902.3±578.8 4445.7±996.48 0.0402
Zhou, 2019, [48] China Accreta/Increta/Percreta Maternal age (years) 32.31 ± 4.20 32.52 ± 4.32 -
Sample size (n) 58 25 -
Intraoperative blood loss (mL) 1215.52 ± 762.57 1602.00 ± 862.47 0.045
Blood transfusion volume (ml) 425.86 ± 667.43 832.80 ± 887.89 0.024
Gestation (weeks) 35.95 ± 0.31 35.83 ± 0.34 0.144
Hysterectomy (%) 6.9 12 0.445
Tan, 2017, [49] Singapore Accreta Maternal age (years) 32 (27–37) 35 (29–43) -
Sample size (n) 11 14 -
Intraoperative blood loss (mL) 2011 (400–5000) 3316 (1000–4000) 0.042
Blood transfusion volume (ml) 1058 (0–3600) 2211 (1190–3980) 0.005
Gestation (weeks) 36.2 (33–38) 35.7 (28.5–39) -
McGinnis, 2019, [50] Columbia Accreta Maternal age (years) 34 (24-44) 33 (26-37) -
Sample size (n) 12 12 -
Intraoperative blood loss (mL) 2450 (1500-3125) 2750 (1875-3500) 0.28
Blood transfusion (units) 3.5 (2.2-5.5) 9.5 (4.2-12) 0.06
Gestation (weeks) 35 (27.9-37.7) 35 (27.9-37.7) 0.28
Panici, 2012, [51] Italy Accreta/Increta/Percreta Maternal age (years) 29.4 ± 1.9 27.5 ± 1.7 -
Sample size (n) 15 18 -
Intraoperative blood loss (mL) 950(790-1100) 3375(2645-4007) <0.001
Blood transfusion (units) 0 (0-1) 4 (3-5) <0.001
Gestation (weeks) 36 ± 0.7 36 ± 0.6 -
Hysterectomy (%) 13 50 0.034
Cho, 2020, [52] Korea Increta/Percreta Maternal age (years) 34.5 ± 2.9 34.8 ± 3.3 -
Sample size (n) 17 25 -
Intraoperative blood loss (mL) 2319 (1000-4500) 4435 (1500-10500) 0.037
Blood transfusion volume (ml) 2060 (1200-8000) 3840 (1800-15200) 0.043
Hysterectomy (%) 29.4 44 0.339
Sun, 2018, [53] China Increta/Percreta Sample size (n) 19 12 -
Intraoperative blood loss (mL) 1200 3150 0.006
Blood transfusion volume (ml) 800 1950 0.017
Zeng, 2017, [54] China Increta/Percreta Maternal age (years) 32.27±5.27 33.13±5.23 -
Sample size (n) 48 38 -
Intraoperative blood loss (mL) 1467.71±1075.77 2218.42±1572.2 0.015
Blood transfusion (units) 5.42±4.95 9.29±7.59 0.008
Gestation (weeks) 36.04±2.18 35.41±2.42 0.205
Hysterectomy (%) 4.2 23.7 0.018
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Reproductive Biology and Endocrinology

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