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Managing an Eclamptic Patient

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Managing an Eclamptic Patient BEST PRACTICES FOR DIAGNOSIS AND MANAGEMENT OF PREECLAMPSIA OBGMANAGEMENT Managing Baha M. Sibai, MD Professor and Chairman Department of Obstetrics an eclamptic patient and Gynecology, University of Cincinnati Most Ob/Gyns have little experience managing acute eclampsia, but all maternity units and obstetricians need to be prepared to diagnose and manage this grave threat. n eclamptic convulsion is frighten- with generalized muscular contractions. ing to behold. First, the woman’s In the second phase, which lasts A face becomes distorted, and her about a minute, the muscles of the body eyes protrude. Then her face acquires a alternately contract and relax in rapid congested expression, and foam may succession. This phase begins with the exude from her mouth. Breathing stops. muscles of the jaw and rapidly encom- Because eclampsia is so frightening, passes eyelids, other facial muscles, and the natural tendency is to try to stop a con- body. If the tongue is unprotected, the vulsion, but this is not the wisest strategy. woman often bites it. Rather, the foremost priorities are to Coma sometimes follows the convul- avoid maternal injury and support cardio- sion, and deep, rapid breathing usually IN THIS ARTICLE vascular functions. How to do this, and begins as soon as the convulsion stops. In how to prevent further convulsions, moni- fact, maintaining oxygenation typically is ❙ Signs and tor and deliver the fetus, and avert compli- not a problem after a single convulsion, symptoms cations are the focus of this article. and the risk of aspiration is low in a well Page 40 Since eclampsia may be fatal for both managed patient. mother and fetus, all labor and delivery Upon reviving, the woman typically ❙ 3 main concerns units and all obstetricians should be pre- remembers nothing about the seizure. pared to diagnose and manage this grave If convulsions recur, some degree of during a convulsion threat. However, few obstetric units consciousness returns after each one, Page 44 encounter more than 1 or 2 cases a year; although the woman may become com- most obstetricians have little or no experi- bative, agitated, and difficult to control. ❙ Recognizing ence managing acute eclampsia. In the magnesium toxicity Western world, it affects only 1 in 2,000 to Page 46 1 in 3,448 pregnancies.1-4 ❚ Harbingers of complications ❙ Fetal response In the developed world, eclampsia increas- es the risk of maternal death (range: 0 to to a convulsion ❚ How a convulsion happens 1.8%).1-5 A recent review of all reported Page 49 Most convulsions occur in 2 phases and pregnancy-related deaths in the United last for 60 to 75 seconds. The first phase, States from 1979 to 1992 found 4,024 lasting 15 to 20 seconds, begins with facial cases.6 Of these, 790 (19.6%) were due to twitching, soon followed by a rigid body preeclampsia-eclampsia, 49% of which www.obgmanagement.com May 2005 • OBG MANAGEMENT 37 ▲ Managing an eclamptic patient TABLE 1 Maternal complications Antepartum eclampsia, especially when it is remote from term, is much more likely to lead to complications COMPLICATION RATE (%) REMARKS Death 0.5-–2 Risk of death is higher: Older than 30 years of age No prenatal care African Americans Onset of preeclampsia or eclampsia before 28 weeks’ gestation Intracerebral hemorrhage <1 Usually related to several risk factors Aspiration pneumonia 2–3 Heightened risk of maternal hypoxemia and acidosis Disseminated coagulopathy 3–5 Regional anesthesia is contraindicated in these patients, and there is a heightened risk of hemorrhagic shock Pulmonary edema 3–5 Heightened risk of maternal hypoxemia and acidosis Acute renal failure 5–9 Usually seen in association with abruptio placentae, maternal hemorrhage, and prolonged maternal hypotension Abruptio placentae 7–10 Can occur after a convulsion; suspect it if fetal bradycardia or late decelerations persist HELLP syndrome 10–15 were caused by eclampsia. The risk of mately 50% of cases, and about 25% death from preeclampsia or eclampsia was occur before 32 weeks’ gestation.1 FAST TRACK higher for the following groups: In my series • women over 30, • no prenatal care, of eclampsia • African Americans, and ❚ Diagnosis can be tricky cases, there was • onset of preeclampsia or eclampsia before When the patient has generalized edema, no hypertension 28 weeks.6 hypertension, proteinuria, and convul- sions, diagnosis of eclampsia is straight- in 16% and Maternal morbidity forward. Unfortunately, women with no edema in 26% Pregnancies complicated by eclampsia also eclampsia exhibit a broad spectrum of have higher rates of maternal morbidity signs, ranging from severe hypertension, such as pulmonary edema and HELLP severe proteinuria, and generalized syndrome (TABLE 1). Complications are edema, to absent or minimal hyperten- substantially higher among women who sion, nonexistent proteinuria, and no develop antepartum eclampsia, especially edema (TABLE 2).1 when it is remote from term.1-3 Hypertension is the hallmark of diagnosis. Hypertension is severe (at least 160 mm Adverse perinatal outcomes Hg systolic and/or at least 110 mm Hg Perinatal mortality and morbidity are high diastolic) in 20% to 54% of cases, and it in eclampsia, with a perinatal death rate in is mild (systolic pressure between 140 recent series of 5.6% to 11.8%.1,7 This high and 160 mm Hg or diastolic pressure rate is related to prematurity, abruptio pla- between 90 and 110 mm Hg) in 30% to centae, and severe growth restriction.1 60% of cases.2,3 In 16% of cases, there Preterm deliveries occur in approxi- may be no hypertension at all.2 CONTINUED 38 OBG MANAGEMENT • May 2005 ▲ Managing an eclamptic patient TABLE 2 Signs and symptoms of eclampsia* Hypertension and proteinuria in eclampsia may be severe, mild, or even absent FREQUENCY (%) IN CONDITION WOMEN WITH ECLAMPSIA REMARKS SIGNS Hypertension 85 Should be documented on Severe: 160/110 mm Hg or more 20–54 at least 2 occasions more than Mild: 140–160/90–110 mm Hg 30–60 6 hours apart No hypertension2 16 Proteinuria 85 At least 1+ on dipstick2 48 At least 3+ on dipstick 14 No proteinuria 15 SYMPTOMS At least 1 of the following: 33–75 Clinical symptoms may occur before or after a convulsion Headache 30–70 Persistent, occipital, or frontal Right upper quadrant 12–20 or epigastric pain Visual changes 19–32 Blurred vision, photophobia Altered mental changes 4–5 * Summary of 5 series Proteinuria. Eclampsia usually is associat- Usual times of onset FAST TRACK ed with proteinuria (at least 1+ on dip- Eclamptic convulsions can occur during preg- Hypertension, stick).1 However, when I studied a series nancy or delivery, or after delivery (TABLE 3).1-5 of 399 women with eclampsia, I found Approximately 91% of antepartum cases proteinuria, and substantial proteinuria (3+ or above on develop at 28 weeks or beyond. The remain- edema can be dipstick) in only 48% of cases; protein- ing cases tend to occur between 21 and 27 severe, mild, uria was absent in 14%.2 weeks’ gestation (7.5%), or at or before 20 Edema. A weight gain of more than 2 lb weeks (1.5%).2 or even absent per week (with or without clinical When eclampsia occurs before 20 edema) during the third trimester may be weeks, it usually involves molar or hydrop- the first sign of eclampsia. However, in ic degeneration of the placenta, with or my series of 399 women, edema was without a fetus.1 However, eclampsia can absent in 26% of cases.2 occur in the first half of pregnancy without molar degeneration of the placenta, Symptoms of eclampsia although this is rare.1,2 These women are Several clinical symptoms can occur sometimes misdiagnosed as having hyper- before or after a convulsion1: tensive encephalopathy, seizure disorder, or • persistent occipital or frontal thrombotic thrombocytopenia purpura. headaches, Thus, women who develop convulsions in • blurred vision, association with hypertension and protein- • photophobia, uria in the first half of pregnancy should be • epigastric and/or right upper assumed to have eclampsia until proven quadrant pain, and otherwise,1 and require ultrasound exami- • altered mental status. nation of the uterus to rule out molar preg- CONTINUED 40 OBG MANAGEMENT • May 2005 Managing an eclamptic patient ▲ TABLE 3 Usual times of onset* 91% of antepartum eclampsia cases occur at 28 weeks or later, although eclamptic convulsions can occur at any time during pregnancy or delivery, or postpartum ONSET FREQUENCY (%) REMARKS Antepartum 38–53 Maternal and perinatal mortality, and the incidence ≤20 weeks 1.5 of complications and underlying disease, are higher 21 to 27 weeks 7.5 in antepartum eclampsia, especially in early cases ≥28 weeks 91 Intrapartum 18–36 Intrapartum eclampsia more closely resembles postpartum disease than antepartum cases Postpartum 11–44 Late postpartum eclampsia occurs more than ≤48 hours 7–39 48 hours but less than 4 weeks after delivery >48 hours 5–26 * Summary of 5 series nancy and/or hydropic or cystic degenera- lap several other medical and surgical con- tion of the placenta. ditions.1,10 Of course, eclampsia is the most Postpartum cases tend to occur within the common cause of convulsions in a woman first 48 hours, although some develop with hypertension and/or proteinuria dur- beyond this limit and have been reported ing pregnancy or immediately postpartum. as late as 23 days postpartum.8 On rare occasions, other causes of convul- Late postpartum eclampsia occurs sions in pregnancy or postpartum may more than 48 hours but less than 4 weeks mimic eclampsia.1 These potential diag- after delivery.8 These women have signs noses are particularly important when the and symptoms consistent with preeclamp- woman has focal neurologic deficits, pro- sia along with their convulsions.8,9 Thus, longed coma, or atypical eclampsia.
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