41) [455]. MgSO4 (vs. nimodipine) reduces eclampsia, but there were more respiratory problems (RR 3.61; 95% CI 1.01–12.91) and the need for additional antihypertensives
(RR 1.19; 95% CI 1.08–1.31) [455]. In preeclampsia, although the risk of eclampsia is lower with MgSO4 (vs. placebo, no therapy, or other anticonvulsants), it is controversial whether women with non-severe preeclampsia should receive MgSO4, due to Caesarean delivery and maternal adverse effect risks, as well as cost (i.e., US$23000 to prevent one seizure if administered to all women with preeclampsia) [457]. There is no international consensus on what defines severe pre-eclampsia. This document defines it as pre-eclampsia requiring delivery, due to serious maternal end-organ involvement and/or fetal compromise (see Classification). For eclampsia prevention in the setting of non-severe pre-eclampsia, we have added to the indication for MgSO4 (in recommendation Lumacaftor 3 above), the following symptoms/signs as these are included in the definition of severe pre-eclampsia by other Nutlin-3 manufacturer organizations: severe hypertension, headaches/visual symptoms, right upper quadrant/epigastric
pain, platelet count <100,000 × 109/L, progressive renal insufficiency, and/or elevated liver enzymes. However, it should be noted that moving from universal prophylaxis to selection of only those women with more severe disease may increase (marginally) eclampsia and associated general anaesthesia and adverse neonatal outcomes [458]. The role of modified MgSO4 protocols is uncertain (i.e., eclampsia treatment with loading dose-only or low-dose regimens, others and eclampsia prevention with abbreviated postpartum courses vs. 24 h of treatment) [459], [460], [461], [462] and [463]. MgSO4 is recommended for fetal neuroprotection in the setting of imminent preterm birth (within the next 24 h) at ⩽316 weeks, and could be considered at up to 336 weeks [464]. For MgSO4treatment of eclampsia, we were unable to identify a cost-effectiveness analysis.
For women with pre-eclampsia, MgSO4 prevents eclampsia but costs more (vs. no treatment) [457]. In high income countries, the NNT to prevent one case of eclampsia is 43 [68], with an incremental cost of US$21,202; this would be $12,942 if treatment were restricted to severe preeclampsia. Conventionally, $50,000 per case prevented is the threshold for ‘willingness to pay’. MgSO4 for fetal neuroprotection (vs. no treatment) is highly cost-effective [465]. 1. Plasma volume expansion is not recommended for women with preeclampsia (I-E; Moderate/Strong). Women with preeclampsia are intravascularly volume contracted with high sympathetic tone. Colloid solutions do not improve maternal, perinatal or 12 month neurodevelopmental outcomes, but may increase Caesarean deliveries, decrease pregnancy prolongation, and increase pulmonary oedema [466] and [467]. 1. Every obstetrical centre should be aware of the local delay between ordering and receiving platelets units (IIIB; Very low/Strong).
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