Hypertension Disorders in Pregnancy Overview
This content delves into hypertension disorders in pregnancy, including gestational hypertension, preeclampsia, and their pathophysiological effects on the cardiovascular, hematologic, renal, neurologic, pulmonary, and fetal systems.
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Presentation Transcript
Hypertension in Pregnancy Dapinderjit Gill Ross University MS3
Hypertension Disorders in Pregnancy Gestational HTN Transient HTN of pregnancy Preeclampsia Mild Severe Classification of the American College of Obstetricians and Gynecologists Eclampsia Chronic HTN preceding pregnancy Chronic HTN with superimposed pregnancy- induced hypertension Superimposed preeclampsia Superimposed eclampsia
Gestational HTN sustained systolic blood pressure at or above 140mmHg, or a diastolic blood pressure of 90mmHg or greater increase in BP must be present on at least two separate occasions, 6 hours or more apart HTN in late pregnancy (>20 weeks gestation) in the absence of other findings suggestive of preeclampsia if BP returns to baseline by 12 weeks postpartum = dx. of Transient hypertension of pregnancy
Gestational HTN 5-10% of pregnancies that proceed beyond 1sttrimester develop gestational HTN increased incidence of up to 30% in multiple gestation 15-25% of women initially diagnosed with gestational HTN develop preeclampsia Earlier onset of gestational HTN are more likely to progress to preeclampsia
Pathophysiology Changes seen in patients Cardiovascular effects Elevated BP Increased cardiac output Hematologic effects Third spacing of fluid due to increased blood pressure and decreased plasma oncotic pressure Renal effects Atheroscleroticlike changes in renal vessels (glomerular endotheliosis) decreased glomerular filtration rate and proteinuria Uric acid filtration is decreased
Pathophysiology Changes seen in patients Neurologic effects Hyperreflexia/hypersensitivity (does not correlate with severity of disease) In severe cases, grand mal seizures Pulmonary effects Pulmonary edema may occur due to decreased colloid oncotic pressure Fetal effects (severe gestational HTN) Vasospasm Decreased intermittent placental perfusion IUGR, oligohydramnios, low birth weight
Pathophysiology Mechanisms Uterine vascular changes Trophoblastic-mediated vascular changes decreased musculature in spiral arterioles development of low resistance, low pressure, high-flow system Inadequate maternal vascular response Endothelial damage is also noted within the vessels Hemostatic changes Increased PLT activation with increased endothelial fibronectin and decreased antithrombin III and alpha-2-antiplasmin further endothelial damage is thought to promote further vasospasm
Pathophysiology Mechanisms Changes in prostanoids During pregnancy, both PGI2(vasodilation and decreased PLT aggregation) and TXA2(vasoconstriction and PLT aggregation) are increased with balance favored to PGI2 In preeclampsia, TXA2is favored Changes in endothelium-derived factors Decrease in Nitric oxide promoting vasoconstriction
Gestational HTN Mild: outpatient with weekly visits, bed rest Antihypertensive therapy: Indicated if diastolic pressure is repeatedly above 110mmHg Hydralazine (Apresoline) 5mg increments IV until acceptable BP is obtained (diastolic pressure to 90-100mmHg range) Other medications that can be used in pregnancy (oral): methyldopa 250mg BID/TID max 3g/day Labetalol 100mg max 2400mg/day Nifedipine 30-60mg max 120mg/day Magnesium sulfate in severe gestational HTN for seizure prophylaxis
Chronic HTN HTN present before 20thweek of gestation or beyond 6 weeks postpartum (>12 weeks postpartum from uptodate.com) 15% of gestational HTN cases go on to develop chronic HTN 25% risk of developing superimposed preeclampsia or eclampsia Close monitoring of maternal BP and follow appropriate fetal growth and well-being Pt. should be encouraged to increase the amount of time she rests
Preeclampsia Development of HTN with proteinuria induced by pregnancy generally in the second half of gestation More frequent at the extremes of reproductive years More common in women who have not carried a previous pregnancy beyond 20 weeks old women or young lady?
Preeclampsia Mild: BP: systolic > 140mmHg and/or diastolic > 90mmHg Proteinuria: >300mg on 24h collection of +1 on single sample Severe: BP: systolic > 160-180mmHg and/or diastolic > 110mmHg Proteinuria: >5g on 24h collection or +2 on single sample Multisystem alterations: cerebral or visual disturbances, oliguria, pulmonary edema, cyanosis, epigastric or right upper quadrant pain, thrombocytopenia
Preeclampsia Mild preeclampsia If immature fetus bed rest mainly in lateral decubitus position HTN therapy if needed Severe preeclampsia Magnesium sulfate 4g loading dose with 1-3g/hr infusion rate Antihypertensive therapy Induction or cesarean delivery fetal pulmonary maturity depending on gestational age should be considered (>=34weeks)
Eclampsia addition of convulsions in a woman with preeclampsia occurs in 0.5-4% of deliveries most cases occur within 24h of delivery with about 3% of cases diagnosed between 2-10 days postpartum 25% have eclamptic seizures before labour, 50% during labour, and 25% after delivery
Eclampsia Anticonvulsant therapy Diazepam or similar drugs Magnesium sulfate to prevent further seizures Maintain adequate airway, oxygenation, restraining gently as needed and inserting a padded tongue blade
HELLP Syndrome HTN patients with hemolysis (H), elevated liver enzymes (EL), low platelet count (LP) 4-12% of pt. with severe preeclampsia and eclampsia develop HELLP syndrome HELLP! first sx. often missed: nausea, emesis, and non-specific viral-like syndrome
HELLP Syndrome Treatment: cardiovascular stabilization, correction of coagulation abnormalities, and delivery PLT transfusion before or after delivery if PLT count is <20,000/mm3 (advised at <50,000/mm3 before cesarean) <32 weeks gestation; steroid therapy may help stabilize maternal PLT count
References Beckmann, Charles R.B., Ling, Frank W., Smith, Roger P., Barzansky, Barbara M., Herbert, William N.P., Laube, Douglas W. Obstetrics and Gynecology . 5th edition Lippincott Williams & Wilkins. pp. 188-196 Magloire, Lissa etc. Gestational Hypertension . May 2011.<uptodate.com> August, Phyllis et. al. Management of hypertension in pregnancy and postpartum women . May 2011 <uptodate.com>
