Presentation on theme: "Hypertension in Pregnancy Ramon M. Gonzalez, MD Professor UST Medicine and Surgery."— Presentation transcript:
Hypertension in Pregnancy Ramon M. Gonzalez, MD Professor UST Medicine and Surgery
A 26y/o G weeks known hypertensive for 6 years was admitted because of severe hypertension VS- BP-200/100mmHg, PR- 76/min, RR-20/min, T-36.5C. She was taking calcium channel blockers for her HPN which she was taking regularly.
Hypertensive Disorders Complicating Pregnancy Gestational Hypertension – Systolic BP≥ 140 or diastolic ≥ 90 mmHg for the first time after 20 weeks gestation – No proteinuria – BP returns to normal before 12 weeks postpartum – Final diagnosis made only postpartum – May have other signs or symptoms of preeclampsia
Hypertensive Disorders Complicating Pregnancy Preeclampsia – Minimum criteria BP ≥ 140/90 mmHg after 20 weeks gestation Proteinuria ≥ 300mg/24 hours or ≥ 1+ dipstick – Severe preeclampsia BP ≥ 160/110 mmHg Proteiunuria 2.0gms/24 hrs or ≥ 2+ dipstick Serum creatinine > 1.2mg/dl Platelets < 100,00/ul Elevated LDH, ALT or AST
Hypertensive Disorders Complicating Pregnancy Eclampsia – Seizures that cannot be attributed to other causes in women with preeclampsia Chronic Hypertension – BP ≥ 140/90 mmHg before pregnancy or diagnosed before 20 weeks gestation – Hypertension first diagnosed after 20 weeks gestation and persistent after 12 weeks postpartum
Hypertensive Disorders Complicating Pregnancy Superimposed Preeclampsia – New onset proteinuria ≥ 300mg/24 hrs in hypertensive women but no proteinuria before 20 weeks gestation
Pregnancy weeks, Chronic Hypertension
Maternal Assessment Duration of hypertension Current therapy Degree of BP control Other medical complications
1.What are the effects of chronic hypertension on pregnancy? 2.What is the management of chronic hypertension during pregnancy? 3.Can we prevent superimposition of preeclampsia ? 4.What is the management of chronic hypertension with superimposed preeclampsia?
What are the effects of chronic hypertension on pregnancy?
What is the management of chronic hypertension during pregnancy?
Management Blood pressure control Fetal antepartum surveillance Prevention of preeclampsia Detection of preeclampsia
Blood Pressure Control Ca Channel Blockers Adrenergic Blocking Agents Vasodilators Diuretics ACE Inhibitors/ARB – contraindicated
El Guindy, A.A. and Nabhan, A.F. (2008) Journal of Perinatal Medicine Women in the tight control group – Were less likely to develop severe hypertension (RR 0.32, 95% CI 0.14 to 0.74) – Delivered babies with older gestational ages (36.6 ±2.2 weeks vs 35.8 ± 2.2 weeks: P<0.05) – Fewer preterm deliveries (RR 0.52, 95%CI 0.28 to 0.99) – No significant differences between groups regarding stillbirth or IUGR A randomized trial of tight vs. less tight control of mild essential and gestational hypertension in pregnancy
Fetal Antepartum Surveillance Fetal biometry Nonstress test Contraction stress test Biophysical profile Doppler velocimetry
Can we prevent superimposition of preeclampsia?
Preeclampsia Pregnancy specific syndrome that can affect virtually every organ system. Disorder of unknown etiology affecting 5-10% of all pregnancies. In developed countries 16% of maternal deaths were due to hypertensive disorder. POGS (2006) % maternal deaths were due to hypertensive disorder.
Pathogenesis Vasospam – Increased resistance → hypertension – Endothelial cell damage → leakage of blood constituents, including platelets and fibrinogen – Decreased blood flow → ischemia of tissues → necrosis, hemorrhage and other end organ disturbances
Pathogenesis Endothelial cell activation – Increased pressor responses Increased sensitivity to angiotensin II – Prostaglandin Prostacyclin: thromboxane A2 ratio decreases – Nitric oxide Decreased nitric oxide synthase expression – Endothelins Potent vasoconstrictor which is increased in preeclampsia
Cardiovascular System ↑ Cardiac afterload – hypertension ↑Cardiac preload – Diminished hypervolemia – ↑ intravenous crystalloids Extravasation of intravascular fluid into the extracellular space – Pulmonary edema
Blood Volume and Coagulation Hemoconcentration – Hallmark of preeclampsia – Vasospasm and endothelial leakage Thrombocytopenia Hemolysis – Endothelial disruption HELLP syndrome
Prevention of Superimposed Preeclampsia Systematic Review by Duley et al 59 trials with 37,560 women given Aspirin – 17% reduction in the risk of preeclampsia (RR 0.83, ), especially in high risk patients – 8% reduction in the relative risk of preterm birth (RR 0.92, ) – 14% reduction in fetal and neonatal deaths (RR 0.86, ) – 10% reduction in SGA babies (0.90, )
Detection of Preeclampsia BP monitoring 24 hour urine proteins
What is the management of chronic hypertension with superimposed preeclampsia?
Management Termination of pregnancy with the least possible trauma to mother and baby Birth of an infant who subsequently thrives Complete restoration of health to the mother
Severe Preeclampsia Clinical course is progressive deterioration in both maternal and fetal condition Associated with high rates of maternal and perinatal morbidity and mortality
Management of Severe Preeclampsia Aggressive -High neonatal mortality and morbidity due to prematurity -Prolonged NICU stay - Long term disability Expectant - Fetal death - Asphyxial damage in utero - Increased maternal morbidity
Odendaal and associates Aggressive vs expectant management 58 patients, 20 were delivered w/in 48 hours 20 aggressive, 18 expectant weeks Betamethasone, MgSO4, Antihypertensive drugs Maternal and fetal testing
Sibai and colleagues Aggressive vs expectant management weeks 95 patients Aggressive (n=46); expectant (n=49) Bed rest, antihypertensives, MgSO4, betamethasone, maternal and fetal testing, laboratory exams
Expectant Management Prolongs pregnancy Higher gestational age Higher birth weight Lower incidence of admission to NICU Lower incidence of neonatal complication No difference in the incidence of CS, abruptio placenta, HELLP syndrome and postpartum stay
Guidelines for Expectant Management Hospitalization in a tertiary hospital - Good facilities to monitor the mother and fetus - NICU facilities - Trained personnels MgSO4 Antihypertensives Corticosteroids
Blood pressure measurement - Systolic – 140 – 155 mmHG - Diastolic – 90 – 105 mmHG Daily 24 hour urine volume Maternal symptoms Search for imminent signs of eclampsia Sibai et al AmJOG 2007
Maternal Assessment CBC with platelet counts Serum creatinine Liver function test – AST/ALT – Lactate dehydrogenase Sibai et al AmJOG 2007
Maternal Indications for Delivery in Women With Severe Preeclampsia Persistent severe headache or visual changes; eclampsia Pulmonary edema Uncontrolled severe HPN Epigastric pain/RUQ pain with AST or ALT >2 times the upper limit of normal Sibai et al AmJOG 2007
Maternal Indications for Delivery in Women With Severe Preeclampsia Oliguria (<500ml/24hr) HELLP syndrome Platelet counts <100,000/mm3 Deterioration of renal function (serum creatinine >/=1.5 mg/dl) Suspected abruptio placenta, progressive labor, and/or rupture of membranes Sibai et al AmJOG 2007
Fetal Indications For Delivery In Women With Severe Preeclampsia Repetitive late or severe variable deceleration Biophysical profile =4 on 2 occasions at 6 hours apart IUGR (Estimated fetal weight <5 th percentile) Umbilical artery Doppler with reverse end diastolic flow Severe oligohydramnios Sibai et al AmJOG 2007
Mode of Delivery Vaginal delivery - Inducible cervix - No fetal distress Cesarean section