Hypertension in pregnancy
Def 🍭
Etiopathogenesis
Hypertension disorders in preg 🗼
Hypertensive disorders
Delta hypertension: Sudden ⬆ in mABP – some woman will deve Eclamptic seizure or HELLP syndrome while still normoactive
⭐Risk factors 🍇
Etiology
Placental implantation with Abnormal trophoblastic invasion of uterine vessels (not entering myometrium in Preeclampsia pt) ➭ ⬇ blood flow ➭ Ischemia
Immunological maladaptive tolerance between Maternal, Paternal (placental), and fetal tissues
Maternal adaptation to CVS or Inflammatory changes of normal preg
Genetic factors including Inherited predisposing genes and epigenetic influences
Pathogenesis 🍇
PathoPSO
BP ≥ 140/90 mmHg or
⬆ SBP 30 mmHg or DBP 15 mmHg over the pre- or early pregnancy lvl
🍰Gestational HT
🍰Preeclampsia-Eclampsia
🍰Chronic HTN
🍰Chronic HTN with superimposed preeclampsia
Sustained SBP ≥ 140 mmHg or DBP ≥ 90 mmHg
(Inc in BP must measured ≥ 2 seperate occasions ≥ 6 hours or more apart)
BP returns to baseline by 12 wks postpartum ➪ Dx Transient hypertension of preg
💛HTN GA after 20 wks + No proteinuria or Absence of other findings suggest preeclampsia
Preg specific HTN with Multisystem involvement
💛1. New onset HTN with New onset proteinuria* in GA after 20 wks
Significant proteinuria*
24hr urine protein ≥ 300 mg
UPCR ≥ 0.3
Urine dipstick 1+
💛2. New onset HTN without proteinuria with New onset of any of the following
Thrombocytopenia (plt < 100,000/microL)
Renal insufficiency (Serum Cr ≥ 1.1 mg/dL or Doubling Serum Cr conc. in absence of other renal ds)
Impaired LFT (x2 of normal conc of Liver transaminases – AST, ALT)
Pulmonary edema
Cerebral or Visual symptoms
Degrees
Mild (nonsevere): SBP ≥ 140 mmHg and/or DBP ≥ 90 mmHg AND Proteinuria ≥ 300 mg on 24hr urine collection or dipstick +1 on single sample
Severe🍇 : same as Mild plus any of the item listed
SBP ≥ 160 mmHg or DBP ≥ 110 mmHg
24 hr collection of Urine protein excretion ≥ 5 g
Thrombocytopenia
Hepatic dysfunction (Elevated liver transaminases or Epigastric pain)
Renal compromise (Oliguria, or Elevated serum Cr ≥ 1.1 in nonrenal ds women)
Pulmonary edema
Neurologic disturbances (Visual changes, Headache, Seizures, Coma)
Placental abruption, Fetal growth restriction, or Oligohydramnios
HELLP syndrome - variant of preeclampsia with poor prognosis
(Hemolysis, Elevated LFT, Low plt) 🍇
Eclampsia: Preeclampsia + Convulsions
Often preceded by premonitory event – Severe headache & hyperreflexia
- 25% hv eclamptic seizures before labor
- 50% hv eclamptic seizures during labor
- 25% hv eclamptic seizures after delivery*
HTN present predate conception or before GA 20 wks
HTN that persists beyond 12 wks postpartum
Complications: 15% of gestational HT can deve into Chronic HT, 25% risk of deve superimposed preeclampsia or eclampsia
💛 New onset proteinuria in a woman with Chronic HT and no proteinuria prior GA 20 wks
💛 Women with proteinuria before GA 20 wks who more likely in the following seven scenarios 🎑
Sudden exacerb. of HT or Need to escalate anti-HT drug dose esp when prev. well controlled with these meds
Sudden manifestations of S&S -- ⬆ abn Liver enzymes
Plt < 100,000/microliters
manifest symptoms (RUQ pain and severe headaches)
deve Pulmonary congestion or edema
deve Renal insufficiency (Serum Cr doubling or increasing ≥ 1.1 mg/dL in women w/o other renal ds)
Sudden, substantial ad sustained increases in protein excretion
Young & nulliparous women
Advanced maternal age
Race and ethnicity (genetic predisposition)
Socioeconomic
Seasonal influences
Obesity
Metabolic syndrome
Multifetal gestation
Hyperhomocysteinemia
Theory of Preeclampsia pathogenesis: 2 stage disorder
Stage I Poor placentation:
Incomplete trophoblastic invasion of spiral arterioles ➭ ⬇ uteroplacental blood flow
Stage II Inflammation:
Ischemic placenta induces Widespread endothelial cell damage and Maternal systemic inflammatory response (such conditions include CVS, Renal ds, DM, obesity, Immunological disorders or Hereditary influences)
Normal preg: ⬇ immune respone ➭ preserve preg
Preeclampsia: Immune response dysfunc
Immunological factors
preeclampsia is multifactorial, polygenic disorder
60% concordance in monozygotic, female twin pairs
22 - 47% twins
20 - 40% daughter of preeclamptic mothers
11 - 37% sisters of preeclamptic women
7 things 🍇
CVS changes
Hematologic changes
HELLP syndrome
Coagulation change* (as ⬆ coagulopathy)
Endocrine changes
Renal changes
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