salwa neyazi assisstent prof. & consultant obg pediatric & adolescent gynecology
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HYPERTENSIVE DISORDERS IN PREGNANCYSALWA NEYAZI
Assisstent Prof. & Consultant OBG
Pediatric & Adolescent Gynecology
INCIDENCE
5-8% of pregnancies 1/3 will have proteinuria A leading cause of direct maternal mortality -(It is the leading cause of DMM in CANADA with
PE) -Increased mortality risk in older gravidas Majority nulliparous Other risk factors: -peexisting HPT -renal disease -CVD -DM -1st preg with new partner -multiple preg -obesity -black race -collagen vascukar disease -thrombophilias -extremes of reproductive age
MEASUREMENT OF BP
Use accurate mercury sphigmomanometer
Sitting position
Appropriate size cuff
Korotkoff sounds I & V (disappearance)
DEFINITIONS
HPT Diastolic BP ≥ 90 based on the average
of 2 measurements taken on the same arm > 5 min apart after 10 min of rest
Severe HPT - Diastolic ≥ 110 on single measurement -Systolic ≥ 160 Incremental rise 30/15 is not criterion for
Dx
PREOTEINURIA
Proteinuria indicate glomerular dysfunction Definition: -urine protein ≥ 300 mg on 24 hrs
collection -24 hrs urine sho uld be considered if
proteinuria ≥ 2+ on dipstick -urine protein/creatinine ratio under study
OEDEMA & WT GAIN ARE NOT PART OF THE CURRENT DEFINITION
C LASSIFICATIONS OF HYPERTENSIVE DISORDERS IN PREGNANCY Preexisting HPT (prepregnancy or≤20wks gestation) -With comorbid conditions -With preeclampsia Gestational HPT ≥ 20 wks gestation -With comorbid conditions -Preeclampsia
PREECLAMPSIA
Preexisting HPT with -Resistent HPT and/or -New or worsening proteinuria
and/or -one or more adverse conditions Gestational HPT with -New proteinuria and/or -one or more adverse conditions
MATERNAL ADVERSE CONDITIONSVASCULAR /PULMONARY
-Diastolic BP ≥110
-Pulmonary edema
-Chest pain
-Shortness of breath
RENAL
-Proteinuria > 3 gm/24 hrs
-Oliguria <500 ml/24 hrs
-Serum albumin < 18 g/L
-elevated serum creatinin
Hepatic
-elevated liver enzymes
-RUQ pain/ epigastric pain
-severe nausea & vomiting
Hematologic
-decreased platelets <100,000/100X10⁹/L
-DIC
HELLP syndrome
-Hemolysis
-elevated liver enzymes
-low platelets
CNS-
-seizures
-frontal headache
- visual disturbances
FETAL
-IUGR
-oligohydramnious
-abnormal dopller
-IUFD
INITIAL EVALUATION
Identify risk markers Clinical evaluation of the mother Evaluation of the fetus Lab investigations Subsequent management
RISK MARKERS
Maternal age >40 Previous PET Antiphospholipid antibodies Preexisting medical conditions BMI>35 Family Hx of PET Booking systolic BP≥130 or diastolic
BP≥80 Interpregnancy interval >10 years Multiple gestation
EVALUATION OF THE MOTHER
BP -Assess severity (severe>160/110) -High BP related to CVA not seizures CNS -Presence & severity of headache -Visual disturbance: blurring or scotoma
-Tremors, irritability, hyperreflexia, somnolence -Nausea & vomitting
EVALUATION OF THE MOTHER
Hematologic -Bleeding -Petechiae Hepatic -RUQ pain/ epigastric pain -Nausea & vomitting
EVALUATION OF THE MOTHER (lab) CBC----Hb, PLT PT, APTT, INR, fibrinogen Bilirubin ALT, AST, LDH, ALBUMIN Glucose. amonia to R/O acute fatty
liver Proteiuria (dipstick, 24 hr collection) Urea, creatinin, uric acid
MANGEMENT GOALS
Prevention of adverse maternal outcomes (organ damage, seizures, CVA,death) Prevention of adverse fetal complications (abruption, IUFD, IUGR) Symptomatic support Delivery is the definitive treatment Deliver when: 1-G HPT is associated with adverse
conditions, regardless of gestational age 2- At or near term
SUPPORTIVE MANAGEMENT
Stress reduction -quiet environment -clear explanation
of Rx plan -consistent
confident team approach Pain relief Antiemetics Minimize liver palpation
ANTIHYPERTENSIVE THERAPY
Minimize the risk of CV A/ death
It is unclear whether antihypertensive therapy for mild-moderate HPT (diastolic 90-105) is beneficial
Gain time for further assessment -Facilitate vaginal delivery if possible -Prolong gestation if premature & appropriate
ANTIHYPERTENSIVE AGENTS--ACUTE1-CALCIUM CHANNEL BLOCKERS NEFIDIPINE
-PO / direct relaxation of the vascular smooth muscle
* Immediate release ---(Adalat) -5-10 mg swallowed / repeat in 30 min if no
response -may cause sudden drop in BP & fetal distress -reports of MI & CVA in the general population—
should be avoided in patients at risk * Intermediate acting ----(Adalat PA) - 10 mg PO repeat dose at 30-45 min if no
response -Onset of action in 90 min
ANTIHYPERTENSIVE AGENTS--ACUTE2-B –BLOCKERS Labetalol -10-20 mg IV over 2 min q 10-30
min up to 300 mg -onset of action in 5-10 min -Max action 30 min -IV infusion 1-2 mg /min --------
increase by 1mg q 15 min Max 4mg/min
ANTIHYPERTENSIVE AGENTS--ACUTE 3-ARTERIOLAR DILATORS Hydralazine -Should not be the first choice agent -A metanalysis showed that it is associated with -more adverse outcomes including:
abruption, fetal distress, low APGAR, CS & oliguria - it is less effective in BP control -onset of action in 5-10 min/ Max action 30 min -5-10 mg IV q 20 min -Infusion 0.5-10 mg/hr
ANTIHYPERTENSIVE AGENTS - MAINTENANCE
GOAL-Without co morbid condition BP 130-155/80-105-With comorbid condition BP 130-139/80-891-Centrally acting agents/ α METHYL-DOPA - Long Hx of safe use in pregnancy -drug of choice for essential HPT -500-1000 mg bd-qid Max 3000 mg/d2-Β blockers/ LABETOLOL 100-600 bd-qid Max 1200/d3-Calcium channel blockers/ NEFIDIPINE -intermediate release 20-40 mg/d Max 80 -extended release 20-60 ng/d Max 120 mg
FLUID MANAGEMENT
Monitor urine output /hourly intake output Total IV intake should not exceed 80-125
ml/hr In case of oliguria <15 ml/hr -follow serum creatinine -watch for magnesium toxicity -consider a small fluid bolus -consultation if persistent Judicious fluid adminstration Beware of pulmonary edema
SEIZURES PROPHYLAXIS
Difficult to predict who will seize Not directly related to the degree of
HPT or the level of proteinuria Mg SO4 is the agent of choice for
seizures prophylaxis in PET or for Rx of Eclampsia
-Dosage-4 gm IV followed by 1-2 g/hr-Do not use Diazepam or Phenytoin
unless Mg SO4 is contraindicated
MgSO4-OVERDOSE
Close observation for toxicity-Weakness, respiratory paralysis,
somnolence, heart block-High risk- renal failure, oliguria
ANTIDOTE Stop MgSO4 infusion 10% Calcium gluconate 10 ml IV over
3 min
MANAGEMENT OF ECLAMPSIA
Call for help Maternal lateral position Protect the airway MgSO4 Post-seizure: oxygen, vital signs,
fetal survillance Assess for evidence of abruption
TRANSPORT
Consider if resources limited & maternal/ fetal condition permits
-maternal BP & symptoms stable
-fetal status reassuring D/W receiving centre & Pt/ family Antihypertensive agent if indicated MgSo4 if indicated
WHEN TO DELIVER ?
Gestational HPT at or near term Gestational HPT with adverse
conditions irrespective of gestational age
-Mild IUGR alone is not an indication for
delivery -Role for prolonging pregnancy
with significant prematurity in a facility with sufficient resources
DELIVERY THE CURE
Timely delivery minimizes morbidity & mortality
Stabilize mother before delivery Delay delivery to gain fetal maturity and
allow for transfer only when fetal & maternal condition allows
Gestational HPT is a progressive disease Expectant management is potentially
harmful in presence of severe disease or suspected fetal compromise
PERI & POST PARTUM MANAGEMENT Gestational HPT may present or worsen after delivery Eclampsia 50 % before labor 25% in labor 25% early postpartum rarely 2 days or more after delivery Mg SO4 should be continued for the first 24 hrs
postpartum in high risk Pt Avoid abrupt drop in BP---aim for 80-100 diastolic Avoid fluid overload Epidural analgesia is favored in the absence of low
platelets or coagulopathy Multidisciplinary approach Patient must be monitored postpartum Can be discharged if BP remains< 160/100 for at least
24 hrs
PREVENTION
ASA -low dose -small role in the prevention of early onset (<34
wks) gestational HPT with proteinuria - delay the onset of proteinuria- Reduce the risk of severer HPT (HELLP, IUGR,
antiphospholipid syndrome ) Calcium supplement (1-2 gm Ca carbonate/day)-decrease the risk of HPT in preg in women who are
considered high risk for gestational HPT & in communities with low Ca intake
Antioxidants (Vit C, E) are not beneficial & may be harmful (increased risk of prematurity)
CONCLUSION
Gestational HPT with proteinuria & adverse condition is an OB Emergency
Multidisciplinary approach for management Prompt recognition & stabilization of the
mother & fetus are important The cure is delivery Timing of delivery is based on -Severity -Fetal maturity &
wellbeing -Maternal status
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