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Uterine atony

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531:) Stimulation of oxytocin receptors in the uterine muscle leads to contractions. The number of these receptors increases during pregnancy and with labor. There are also more in the fundus than in the lower uterine segment. Oxytocin has a quick onset of action, within a few minutes, but also loses effectiveness quickly because of a short half-life. The medicine is given in a rapid infusion and may cause hypotension. Oxytocin alone is the usually treatment of atony in the US. However, if bleeding is uncontrolled after administration of oxytocin, then a second uterotonic is given. 3193: 32: 663:
women with a hemoglobin value less than 7 g/dL. In most cases of uterine atony-related postpartum hemorrhage, the amount of iron lost is not fully replaced by the transfused blood. Oral iron should thus be also considered. Parenteral iron therapy is an option as it accelerated recovery. Most women with mild to moderate anemia, however, resolve the anemia sufficiently rapidly with oral iron alone and do not need parenteral iron.
757: 537:: A synthetic analog of oxytocin, works similarly to oxytocin but the half-life is much longer. It binds to smooth muscle receptors of the uterus, like oxytocin and has been reported to produce a stable uterine contraction, followed by rhythmic contractions. It is not available in the US but is available in many countries for the prevention of uterine atony and hemorrhage. 217:, which is an emergency and potential cause of fatality. Across the globe, postpartum hemorrhage is among the top five causes of maternal death. Recognition of the warning signs of uterine atony in the setting of extensive postpartum bleeding should initiate interventions aimed at regaining stable uterine contraction. 311:
is released continuously during labor to stimulate uterine muscle contraction so that the fetus can be delivered and it is continued to be released after delivery to stop blood flow. If the oxytocin receptors become desensitized and no longer respond to the hormone then the uterus does not contract.
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Postpartum anemia is common after an episode of uterine atony and postpartum hemorrhage. Severe anemia due to PPH may require red cell transfusions, depending on the severity of anemia and the degree of symptomatology attributable to anemia. A common practice is to offer a transfusion to symptomatic
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Uterine artery ligation, with or without ligation of the tubo-ovarian vessels. Ligation of the uterine and utero-ovarian arteries can decrease uterine bleeding by reducing the pressure of arterial blood flow in the uterus. It will not completely control the bleeding but may decrease blood loss while
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Blood loss is an expected part of labor and less than 500 mL is considered normal. Generally, primary PPH is classified as being more than 500 mL of blood lost in the first 24 hours following delivery. Those who have a caesarean section typically have more blood loss than a vaginal birth; so 1000 mL
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There are many risk factors for uterine atony and several are due to the type of labor a mother experiences such as prolonged labor, labor lasting less than 3 hours, uterine inversion, the use of magnesium sulfate infusions, and extended use of oxytocin. Uterine distention caused by things like more
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After the medication is administered, the mother should be closely observed for to confirm the bleeding has stopped. If the bleeding has not stopped or physical exam does not show signs of restored uterine function within 30 minutes of medication administration, immediate invasive interventions are
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oral medication that can stimulate uterine contractions. Misoprostol does not need to be refrigerated because it is heat stable. It is easy to administer compared with oxytocin and ergot alkaloids in low-resource areas where refrigeration and sterile needles are not available. May cause a low-grade
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Identifying risk factors early in the pregnancy is essential in managing uterine atony and PPH. This allows for planning and organizing the necessary resources including staff, medicines, assistive devices, and the proper blood products. The delivery plan should also be cognizant of the ability of
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region may still be squeezing while the lower uterine segment is non-functional. This can be difficult to see with a cursory abdominal examination and easily overlooked. Therefore, a comprehensive vaginal, abdominal, and rectal examination should be performed. The physical examination may include
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There are several different types of uterotonic drugs that may be given, and the each has its own advantages and disadvantages. Moreover, the use of combination uterotonic therapy is a common practice and might be more effective at controlling bleeding than monotherapy. Some combinations might
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is routinely implemented and is considered the standard for patient care. It can be utilized to reduce the risk of PPH. Active management of the third stage includes uterine massage and a IV low dose oxytocin. Whether it is given just before or after the delivery of the placenta is subject to
543:: This is an ergot alkaloid and has multiple mechanisms of action to induce fast, regular uterine contractions which leads to sustained uterine contraction. It can cause peripheral vasoconstriction and is contraindicated in patients with hypertension or pregnancy related hypertension. 582:
techniques include uterine packing (extending into the vagina) with gauze that also has a Foley catheter in place to allow for bladder drainage. It is inexpensive and readily available. Balloon tamponade is the suggested method of tamponade in guidelines for management of PPH. A
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to tamponade (also with vaginal packing) can be used with Foley catheter insertion to facilitate bladder drainage. Vacuum-induced uterine tamponade is newer technique that uses low-level vacuum to evacuate blood from the uterine cavity and facilitate uterine contraction
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A uterine massage is performed by placing a hand on the lower abdomen and using repetitive massaging or squeezing movements in attempt to stimulate the uterus. It is theorized, the massaging motion stimulates uterine contraction and may also trigger the release of local
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Most diagnoses of uterine atony are made during the physical exam directly upon completion of the delivery. Diffuse uterine atony is typically diagnosed by patient observation rather than blood loss. The uterus can be directly palpated or observed indirectly using a
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is the failure of the uterus to contract adequately following delivery. Contraction of the uterine muscles during labor compresses the blood vessels and slows flow, which helps prevent hemorrhage and facilitates coagulation. Therefore, a lack of uterine
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In low‐income countries there are several other factors that play a role in PPH risk. Poor nutritional status, lack of healthcare access, and limited blood product supply are additional factors that increase morbidity and mortality.
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ligation. Bilateral ligation of the internal iliac arteries reduces the pulse pressure of blood flowing to the uterus similar to uterine artery ligation. However, it is not a common procedure because of the degree of difficulty and
2501: 296:. The blood vessels that provide the blood supply to the placenta pass through this muscle. After labor it is the contraction of these muscles that physically squeeze the blood vessels so that 2494: 276:. Cesarean delivery, especially after prolonged labor, may cause the muscles of the uterus to become tired and stop contracting or contraction can be inhibited at the surgical site. 2487: 3198: 1627:
Gallos ID, Williams HM, Price M, Merriel A, Gee H, Lissauer D, Moorthy V, Tobias A, Deeks JJ, Widmer M, Tunçalp Ö (2018-04-25). Cochrane Pregnancy and Childbirth Group (ed.).
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and compression should be maintained, while drugs are administered. An intravenous catheter should also be started to administer fluids, medications, and blood products
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is commonly used to determine excessive blood loss. It is easy to underestimate maternal blood loss because the primary method of assessment is visual observation.
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El Senoun GA, Singh M, Mousa HA, Alfirevic Z (November 2011). "Update on the new modalities on the prevention and management of postpartum haemorrhage".
368: 554:) Highly effective but it is expensive. It can cause bronchospasm and it should be avoided in asthmatics. May cause diarrhea, fevers, or tachycardia. 3094: 354:
and rapid identification of obstetric lacerations, helps exclude other causes of PPH. Laboratory tests can be drawn if coagulopathies are suspected.
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Before delivery all patients should be screened for risk factors and then assigned a postpartum hemorrhage risk stratification based on the
2088:"Novel suction tube uterine tamponade for treating intractable postpartum haemorrhage: description of technique and report of three cases" 1454:
Begley CM, Gyte GM, Devane D, McGuire W, Weeks A, Biesty LM, et al. (The Cochrane Collaboration) (February 2019). Begley CM (ed.).
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Uterine atony occurs during 1 in 40 births in the United States and is responsible for at least 80% of cases of postpartum hemorrhage.
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can also lead to decreased uterine function and atony. Retained placental tissue or placental disorders, such as an adherent placenta,
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Khan KS, Wojdyla D, Say L, Gülmezoglu AM, Van Look PF (April 2006). "WHO analysis of causes of maternal death: a systematic review".
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Mousa HA, Blum J, Abou El Senoun G, Shakur H, Alfirevic Z, et al. (Cochrane Pregnancy and Childbirth Group) (February 2014).
1949:"Uterine flexion suture: modified B-Lynch uterine compression suture for the treatment of uterine atony during cesarean section" 512:
If uterine atony occurs even after all preventative measures have been taken, medical management should be implemented. Uterine
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Breathnach F, Geary M (April 2009). "Uterine atony: definition, prevention, nonsurgical management, and uterine tamponade".
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imaging for rapid visualization of the uterus and other causes of bleeding. Expulsion of gestational products such as the
3220: 652: 1090:"Oxytocin during labour and risk of severe postpartum haemorrhage: a population-based, cohort-nested case-control study" 2747: 496:, such as oxytocin, prophylactically will help reduce blood loss and the need for a blood transfusion after delivery. 3150: 3005: 2932: 2627: 2039:"Bakri balloon placement in the successful management of postpartum hemorrhage in a bicornuate uterus: A case report" 986:"Bakri balloon placement in the successful management of postpartum hemorrhage in a bicornuate uterus: A case report" 312:
The uterus can also be structurally damaged or distended to prevent contraction. Therefore, as placenta is delivered
3177: 2798: 2536: 2198:"Bilateral uterine artery ligation plus B-Lynch procedure for atonic postpartum hemorrhage with placenta accreta" 268:, can inadvertently inhibit uterine contractions. In addition, preeclampsia can lead to blood disorders such as 257: 2679: 2881: 3165: 2948: 2793: 2197: 2961: 2479: 3072: 2871: 2845: 2581: 2527: 3109: 3099: 3017: 2917: 1234: 1146: 231: 213:, as the vasculature is not being sufficiently compressed. Uterine atony is the most common cause of 1504:"WHO recommendation on the use of uterine massage for the treatment of postpartum haemorrhage | RHL" 2635: 2440: 1328:"Obstetric Hemorrhage Outcomes by Intrapartum Risk Stratification at a Single Tertiary Care Center" 671:
Women with a history of PPH have a 2 to 3 times higher risk of PPH in their following pregnancies.
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McDonald S, Abbott JM, Higgins SP, et al. (Cochrane Pregnancy and Childbirth Group) (2004).
880:"Risk factors for uterine atony/postpartum hemorrhage requiring treatment after vaginal delivery" 66: 3155: 3129: 2907: 2727: 2722: 2694: 2671: 2571: 372: 116: 101:
Obesity, uterine distention, placental disorders, multiple gestation, prior PPH, coagulopathies
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Dahlke JD, Mendez-Figueroa H, Maggio L, Hauspurg AK, Sperling JD, Chauhan S, Rouse DJ (2015).
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the hospital or facility to provide an appropriate level of care if any complications occur.
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Belghiti K, Kayem G, Dupont C, Rudigoz RC, Bouvier-Colle MH, Deneux-Tharaux C (2011-12-21).
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can occur after the delivery of the fetus and the placenta. Local hemostatic factors like
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post-delivery. An atonic uterus can feel soft, "boggy" and/or enlarged. Bleeding from the
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Uncontrolled postpartum bleeding, decreased heart rate, pain, soft non-contracted uterus
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Shahin AY, Farghaly TA, Mohamed SA, Shokry M, Abd-El-Aal DE, Youssef MA (March 2010).
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Uterine massage, Oxytocin, uterotonics, tamponade or packing, surgical intervention
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Butwick AJ, Carvalho B, Blumenfeld YJ, El-Sayed YY, Nelson LM, Bateman BT (2015).
1629:"Uterotonic agents for preventing postpartum haemorrhage: a network meta-analysis" 1186:"What measured blood loss tells us about postpartum bleeding: a systematic review" 853: 3077: 3044: 2833: 2818: 2598: 2445: 2158: 1779: 1577:"Prophylactic ergometrine-oxytocin versus oxytocin for the third stage of labour" 1290: 1273: 1038:"A flux of the reds: evolution of active management of the third stage of labour" 235: 129:
Risk stratification and identification, active management of third stage of labor
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This physiological contraction does not occur if the myometrium becomes atonic.
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include oxytocin plus misoprostol, oxytocin plus ergometrine, and carbetocin.
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are damaged and without the muscle contractions hemostasis cannot be reached.
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trauma, complicated labor, medications, uterine distention, caesarean section
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Wetta LA, Szychowski JM, Seals S, Mancuso MS, Biggio JR, Tita AT (2013).
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is also common. If the atony is localized to one area of the uterus, the
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European Journal of Obstetrics & Gynecology and Reproductive Biology
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European Journal of Obstetrics & Gynecology and Reproductive Biology
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The uterus is composed of an interconnected muscle fibers known as the
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increase the mother's risk of PPH. Body mass index (BMI) above 40 and
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recommendations. If the woman is at a medium risk, blood should be
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and platelets and clotting factors aid in stopping the blood flow.
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Sloan NL, Durocher J, Aldrich T, Blum J, Winikoff B (June 2010).
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Text was copied from this source, which is available under a
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Pruritic urticarial papules and plaques of pregnancy (PUPPP)
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Creative Commons Attribution 4.0 International License
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PPH can cause a multitude of complications including:
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tissue factor type-1 plasminogen activator inhibitor
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2710:Integumentary system 2685:Gestational diabetes 2664:related to pregnancy 2662:Other, predominantly 1966:10.2147/IJWH.S170460 504:to help hemostasis. 489:third stage of labor 335:bimanual examination 83:third stage of labor 3105:Postpartum bleeding 2928:Placental abruption 2913:Monochorionic twins 2743:Prurigo gestationis 2290:(9516): 1066–1074. 2010:(1): 76.e1–76.e10. 1345:10.7759/cureus.6456 439:Known coagulopathy 412:Grand multi-parity 404:Multiple gestation 384: 248:abruption placentae 194:postpartum bleeding 3135:Puerperal mastitis 3090:Breast engorgement 2877:Monoamniotic twins 2867:Chorionic hematoma 2037:Abraham C (2017). 1514:on October 3, 2020 1157:(3): 419–34, vii. 612:Hypogastric artery 382: 373:typed and screened 3208: 3207: 3166:Thyroid disorders 3156:Diabetes mellitus 3040:Uterine inversion 2972:Shoulder dystocia 2967:Obstructed labour 2943: 2942: 2807: 2806: 2776:Chorea gravidarum 2552:Ectopic pregnancy 2477: 2476: 2098:(10): 1280–1283. 637:hypovolemic shock 602:Uterine curettage 485: 484: 458:Chorioamnionitis 407:Placenta accrete 258:Magnesium sulfate 199: 198: 107:Diagnostic method 19:Medical condition 3228: 3195: 3194: 3030:Postmature birth 3018:Placenta accreta 2923:Placenta praevia 2918:Placenta accreta 2862:Chorioamnionitis 2672:Digestive system 2668: 2667: 2594:Fetal resorption 2582:Rudimentary horn 2539:abortive outcome 2533: 2532: 2504: 2497: 2490: 2481: 2480: 2424: 2423: 2412: 2411: 2379: 2373: 2372: 2362: 2322: 2316: 2315: 2279: 2273: 2272: 2240: 2234: 2233: 2193: 2187: 2186: 2138: 2132: 2131: 2083: 2077: 2076: 2066: 2034: 2028: 2027: 1995: 1989: 1988: 1978: 1968: 1944: 1935: 1934: 1894: 1888: 1887: 1877: 1837: 1831: 1830: 1798: 1792: 1791: 1759: 1753: 1752: 1715:Arias F (2000). 1712: 1706: 1705: 1673: 1667: 1666: 1656: 1624: 1615: 1614: 1604: 1572: 1566: 1565: 1529: 1523: 1522: 1520: 1519: 1510:. Archived from 1508:extranet.who.int 1500: 1494: 1493: 1483: 1451: 1442: 1441: 1409: 1403: 1402: 1374: 1368: 1367: 1357: 1347: 1323: 1312: 1311: 1293: 1269: 1263: 1262: 1230: 1224: 1223: 1213: 1181: 1175: 1174: 1142: 1136: 1135: 1125: 1085: 1076: 1075: 1065: 1033: 1024: 1023: 1013: 981: 975: 974: 964: 932: 926: 925: 915: 875: 866: 865: 837: 831: 830: 820: 788: 765: 759: 754: 752: 751: 728: 541:Methylergonovine 415:Active bleeding 399:Placenta Previa 385: 381: 270:thrombocytopenia 240:chorioamnionitis 236:uterine fibroids 232:fetal macrosomia 34: 22: 21: 3236: 3235: 3231: 3230: 3229: 3227: 3226: 3225: 3211: 3210: 3209: 3204: 3182: 3139: 3083:Cracked nipples 3078:Low milk supply 3059: 3045:Uterine rupture 2939: 2834:Oligohydramnios 2819:amniotic cavity 2813: 2803: 2780: 2762: 2713: 2704: 2663: 2657: 2626: 2613: 2599:Molar pregnancy 2538: 2522: 2508: 2478: 2473: 2472: 2435: 2421: 2416: 2415: 2380: 2376: 2337:(3): 229.e1–8. 2323: 2319: 2280: 2276: 2241: 2237: 2194: 2190: 2139: 2135: 2084: 2080: 2035: 2031: 1996: 1992: 1945: 1938: 1895: 1891: 1852:(5): 642.e1–7. 1838: 1834: 1799: 1795: 1762:Rath W (2009). 1760: 1756: 1713: 1709: 1674: 1670: 1639:(4): CD011689. 1625: 1618: 1587:(1): CD000201. 1573: 1569: 1530: 1526: 1517: 1515: 1502: 1501: 1497: 1452: 1445: 1410: 1406: 1375: 1371: 1324: 1315: 1270: 1266: 1245:(5): 519.e1–7. 1231: 1227: 1182: 1178: 1143: 1139: 1086: 1079: 1034: 1027: 982: 978: 933: 929: 876: 869: 838: 834: 803:(2): CD003249. 789: 768: 749: 747: 733:"Uterine Atony" 729: 682: 677: 669: 649:hepatic failure 627: 510: 428:Large fibroids 365: 360: 326: 290: 288:Pathophysiology 282: 244:placenta previa 223: 20: 17: 12: 11: 5: 3234: 3224: 3223: 3206: 3205: 3203: 3202: 3187: 3184: 3183: 3181: 3180: 3175: 3173:Maternal death 3170: 3169: 3168: 3163: 3158: 3147: 3145: 3141: 3140: 3138: 3137: 3132: 3127: 3122: 3117: 3112: 3107: 3102: 3097: 3092: 3087: 3086: 3085: 3080: 3069: 3067: 3061: 3060: 3058: 3057: 3052: 3047: 3042: 3037: 3032: 3027: 3022: 3021: 3020: 3008: 3003: 3002: 3001: 2991: 2986: 2981: 2979:Fetal distress 2976: 2975: 2974: 2964: 2959: 2953: 2951: 2945: 2944: 2941: 2940: 2938: 2937: 2936: 2935: 2930: 2925: 2920: 2915: 2910: 2898: 2897: 2896: 2886: 2885: 2884: 2879: 2874: 2869: 2864: 2848: 2843: 2842: 2841: 2839:Polyhydramnios 2836: 2828:amniotic fluid 2823: 2821: 2809: 2808: 2805: 2804: 2802: 2801: 2796: 2790: 2788: 2782: 2781: 2779: 2778: 2772: 2770: 2768:Nervous system 2764: 2763: 2761: 2760: 2755: 2750: 2745: 2740: 2735: 2730: 2725: 2719: 2717: 2706: 2705: 2703: 2702: 2697: 2692: 2687: 2682: 2676: 2674: 2665: 2659: 2658: 2656: 2655: 2650: 2649: 2648: 2646:HELLP syndrome 2638: 2632: 2630: 2615: 2614: 2612: 2611: 2606: 2601: 2596: 2591: 2586: 2585: 2584: 2579: 2574: 2569: 2564: 2559: 2549: 2543: 2541: 2537:Pregnancy with 2530: 2524: 2523: 2507: 2506: 2499: 2492: 2484: 2475: 2474: 2471: 2470: 2459: 2448: 2436: 2431: 2430: 2428: 2427:Classification 2420: 2419:External links 2417: 2414: 2413: 2374: 2317: 2274: 2255:(3): 353–356. 2235: 2188: 2153:(1): 182–195. 2133: 2078: 2029: 1990: 1936: 1889: 1832: 1793: 1754: 1727:(3): 455–468. 1707: 1688:(3): 313–319. 1668: 1616: 1567: 1540:(4): 247–264. 1524: 1495: 1443: 1424:(6): 875–882. 1404: 1369: 1313: 1284:(5): 1368–73. 1264: 1225: 1196:(7): 788–800. 1176: 1137: 1100:(2): e000514. 1077: 1025: 976: 927: 890:(1): 51.e1–6. 867: 832: 766: 679: 678: 676: 673: 668: 665: 656: 655: 650: 647: 644: 639: 634: 626: 623: 622: 621: 616: 609: 605: 599: 573: 572: 566: 555: 544: 538: 532: 514:fundal massage 509: 506: 502:prostaglandins 483: 482: 480: 476: 475: 473: 469: 468: 466: 462: 461: 459: 455: 454: 452: 448: 447: 445: 441: 440: 437: 433: 432: 429: 425: 424: 421: 417: 416: 413: 409: 408: 405: 401: 400: 397: 393: 392: 389: 364: 361: 359: 356: 325: 322: 289: 286: 281: 278: 252:coagulopathies 228:polyhydramnios 222: 219: 197: 196: 190: 186: 185: 182: 176: 175: 145: 139: 138: 135: 131: 130: 127: 123: 122: 119: 113: 112: 109: 103: 102: 99: 93: 92: 89: 85: 84: 81: 77: 76: 69: 63: 62: 59: 53: 52: 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Index


Specialty
Obstetrics
Symptoms
Complications
DIC
Risk factors
Diagnostic method
Differential diagnosis
Medication
Pitocin
Carbetocin
Methergine
Hemabate
Carboprost
Misoprostol
Dinoprostone
Prognosis
postpartum bleeding
muscle
hemorrhage
postpartum hemorrhage
polyhydramnios
fetal macrosomia
uterine fibroids
chorioamnionitis
placenta previa
abruption placentae
coagulopathies
Magnesium sulfate

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