Laboring Under Pressure Episode 3: Hypertensive Disorders of Pregnancy with Dr. Kiersten Williams
Description
Contributor: Kiersten Williams MD, Travis Barlock MD, Jeffrey Olson MS3
Show Pearls
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Hypertensive disorders of pregnancy are one of the leading causes of maternal mortality worldwide.
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Hypertension (HTN) complicates 2-8% of pregnancies
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The definition of HTN in pregnancy is a systolic >140 or diastolic >90, measured 4 hours apart
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There is a range of HTN disorders
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Chronic HTN which could have superimposed preeclampsia (preE) on top
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Gestational HTN in which there are no lab abnormalities
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PreE w/o severe features
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Protein in urine
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Urine protein >300 mg in 24 hours
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Urine Protein to Creatinine ratio of .3
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+2 Protein on urine dipstick
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PreE w/ severe features
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Systolics above 160 mmHg
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Diastolics above 110 mmHg
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Headache, especially not going away with meds, or different than previous headaches
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Visual changes, anything that lasts more than a few minutes
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RUQ pain, which could present as heartburn
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Pulmonary edema
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Low platelets, if <150 perk up ears, <100 definitely look into
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Renal insufficiency, creatinine 1.1 or higher or doubling of baseline
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Impaired liver function
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Note: Hemoconcentration and LDH >600 are not diagnostic but worth paying attention to
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Treatment
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Labetalol, IV
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Avoid in bradycardia, asthma, or myocardial disease
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Quick up titrate, with dosing regimens such as 20-20-40 or 20-40-80 (mg)
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Hydralazine, IV
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5 mg starting, then another 5 mg then 10 mg if not working
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Nifedipine, Oral
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Can cause a headache
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Goal is not to normalize BP but bring it down slowly
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How to give magnesium
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Start with 6 g or 4 g over 20 minutes if the patient is small or has bad kidney function
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Follow with 2 g per hour or 1 g per hour
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Don’t give in myasthenia gravis
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What should you do if the patient progresses to eclampsia (seizures)
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Magnesium is the best drug
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Can use phenytoin or benzos IV as an alternate
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Diazepam is available PR which is a good option if you don’t have IV access
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IM magnesium is doable but painful, mix with lidocaine and split dose between the butt cheeks
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Facts about post-partum PreE
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20% of women will have HTN post-partum
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Most resolve by 6 weeks
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If it lingers past 6 months this is chronic HTN
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If the patient has severe features (see above) they desevere 24 hours on magnesium while being monitored on the L&D floor
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Post-partum is the most common time for strokes
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Providers can be much more aggressive with HTN treatment because the fetus is no longer being exposed
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Enalapril is safe in breast feeding
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Some patients might need to give up breast feeding to be on even more aggressive HTN therapy
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Are NSAIDs safe while breastfeeding?
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Motrin is pretty safe
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Pulm edema is a risk, be careful with fluids
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Last pearl: Put pregnant patients in left or right lateral decubitus while in ER or put a folded towel under their hip to help with venous return which can also help with nausea
References
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Metoki, H., Iwama, N., Hamada, H., Satoh, M., Murakami, T., Ishikuro, M., & Obara, T. (2022). Hypertensive disorders of pregnancy: definition, management, and out-of-office blood pressure measurement. Hypertension research : official journal of the Japanese Society of Hypertension, 45(8), 1298–1309. https://doi.org/10.1038/s41440-022-00965-6
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Rana, S., Lemoine, E., Granger, J. P., & Karumanchi, S. A. (2019). Preeclampsia: Pathophysiology, Challenges, and Perspectives. Circulation research, 124(7), 1094–1112. https://doi.org/10.1161/CIRCRESAHA.118.313276
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Reed, B. (2020, May 2). ‘They didn’t listen to me’: Amber Rose Isaac tweeted about her death before dying in childbirth. The Guardian. https://www.theguardian.com/us-news/2020/may/02/amber-rose-isaac-new-york-childbirth-death
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Reisner, S. H., Eisenberg, N. H., Stahl, B., & Hauser, G. J. (1983). Maternal medications and breast-feeding. Developmental pharmacology and therapeutics, 6(5), 285–304. https://doi.org/10.1159/000457330
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Wilkerson, R. G., & Ogunbodede, A. C. (2019). Hypertensive Disorders of Pregnancy. Emergency medicine clinics of North America, 37(2), 301–316. https://doi.org/10.1016/j.emc.2019.01.008
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Wu, P., Green, M., & Myers, J. E. (2023). Hypertensive disorders of pregnancy. BMJ (Clinical research ed.), 381, e071653. https://doi.org/10.1136/bmj-2022-071653
Produced by Jeffrey Olson, MS3 | Edited by Jeffrey Olson and Jorge Chalit, OMSIII