LEC 5: Health Challenges in Pregnancy Flashcards
Factors Placing a Woman at Risk During Pregnancy: Biophysical Factors
- Genetic conditions
- Chromosomal abnormalities
- Multiple pregnancy
- Defective genes
- Inherited disorders
- ABO incompatibility
- Large fetal size
- Medical and obstetric conditions
- Preterm labour and birth
- Cardiovascular disease
- Chronic hypertension
- Incompetent cervix
- Placental abnormalities
- Infection
- Diabetes
- Maternal collagen diseases
- Pregnancy-induced hypertension
- Asthma
- Postterm pregnancy
- Hemoglobinopathies
- Nutritional status
- Inadequate dietary intake
- Food Fads
- Excessive food intake
- Under-or overweight status
- Hematocrit value less than 33%
- Eating disorder
Factors Placing a Woman at Risk During Pregnancy: Psychosocial Factors
- Smoking
- Caffeine
- Alcohol
- Drugs
- Inadequate support system
- Situational crisus
- History of violence
- Emotional distress
- Unsafe cultrual practices
Factors Placing a Woman at Risk During Pregnancy: Sociodemographic Factors
- Poverty status
- Lack of prenatal cafre
- Age younger than 15 yers or older than 35 years
- Parity
- All first pregnancies and more than five pregnancies
- Marital status
- Increased risk for unmarried
- Accessibility to health care
- Ethnicity
- Increased risk in nonwhite women
Factors Placing a Woman at Risk During Pregnancy: Environmental Factors
- Infections
- Radiation
- Pesticides
- Illicit drugs
- Industrial pollutants
- Secondhand cigarette smoke
- Personal stress
Hypertensive Disorders of Pregnancy
- Other Names:
- Pregnancy Induced Hypertension (PIH)
- Gestational Hypertension (GH)
- Pre-exlampsia
- Tozemia
- Incidence around 10%
- Cause is unknown
Classification of Hypertensive Disorder in Pregnancy
- Pre-Existing
- Predates pregnancy or before 20 weeks
- Gestational
- Systolic > 140mmHg and/or Diastolic >90mmHg
- After 20 weeks and upt o 12 weeks PP
- Usually, of you remove the baby, you remove the hypertensive disorder
- If we start seeing trends in the BP, then it might be necessary to follow the patient out in the community
- Accuracy in BP measurment
Preclampsia
- Systolic > 140mmHg and/or Diastolic > 90mmHg
- Protenuria (2+ or greater) and/or 1 or more adverse conditionso r complications
Severe Preeclampsia
- >160/110 mmHg
- Heavy proteinuria (3-5g/ 24 hours)
- 1 or more adverse conditions/ severe complications
Eclampsia
- Seizure
Adverse Conditions
- Headache
- Common
- Visual disturbances
- Common
- Abdominal/ Epigastric/ RUQ pain
- Common
- Nausea/ Vomiting
- Chest pain/ SOB
- Abnormal maternal lab values
- Fetal morbitity
- Edima/ Weight Gain
- Need to be in combination with other conditions
- Hyperreflexia
- Need to be in combination with other conditions
Consequences of Preeclampsia: Maternal
- Stroke
- Pulmonary edema
- Hepatic failure
- Jaindice
- Seizures
- Placental abruption
- Acute renal failure
- HELLP syndrome and DIC
Consequences of Preeclampsia: Fetal
- IUGR
- Oligohydramnios
- Too little fluid
- ABsent or reversed end diastolic umbiliacl artery flow by Doppler
- Placental abruption
- Prematurity (iatrogenic)
- Fetal compromise (metabolic acidosis)
- Intrauterine death
What is the cause of gestational hypertension?
The cause is unknown
Risk Factors for Gestational Hypertension
- Nullipara or first pregnancy with a new partner
- Previous pregnancy with hypertension/ preeclampsia
- Personal or family hisotry of hypertension
- Poor nutrition
- Obesity
- Ethnicity
- Advanced maternal age (>35)
- Multiple gestation (twins,triplets)
- Diabetes
Vasospasm
Increased blood pressure.
Hypoperfusion
Reduced amount of blood flow to the uterus, therfore the baby will get less blood.
Initial Managment of Gestational Hypertension?
- Stress reduction/ reduced activity
- Assessment of mother and fetus
- Antipartum
- Postpartum
- Home visits
- Treat nausea and vomitting
- Treat epigastric pain
- Treat blood pressure
- Consider seizure prophylaxis
- Consider timing/ mode of delivery
Managment of Gestational Hypertension
-
Home caer if non-severe hypertension
- Client monitors her blood pressure
- Measures weight and test urine protein daily
- NST’s performed daily or bi-weekly
- Advised to report signs of adverse conditions
-
In-Patient Hospital Care if Severe Hypertension/ Preeclampsia
- Fetal evaluation
- Fetal movement couting, NST< Biophysical profile, ultrasound, measurement of AFI, Serial U/S to assess growth, Imbilical artery doppler flow
- Hourly intake and output
- Frequent BP, pulse, respirations
- Blood work (liver enzymes, platelets, Hct)
- Monitor for adverse conditions
- Fetal evaluation
Medications to Treat Gestational Hypertension: Anti-Hypertensives
-
Labetalol
- Adrenergic blocker
-
Nifedipine (Adalat)
- Calcium cahnnel blocker
-
Hydralazine (Apresoline)
- Arteriolar dilators
-
Aldomet (Methyldopa)
- Centrally-acting sympatholytic
- ACE inhibotros contraindicated
Medications to Treat Gestational Hypertension: Anti-Convulsant
- Magnesium Sulfate MgSO4
- Tachycardia
- NB to test reflexes
- Monitor urine output (excreted by kidneys)
- Can slow labour
- Musle weakness
- Lack of energy and drowsiness
- Respiratory depression
- Lower blood pressure
- Goal is to reduce risk for seizures
- Do alot of monitoring because side effects are often CNS related
Magnesium Toxicity
- Central Nervouse System Depression
- Respiratory rate <12
- Oligouria <30ml/hr
- Diminished or absent DTR
- Serum magnesium 4.8-9.7 mEq
Eclampsia = Seizure
- Anticonvulsants:
- Bolus of magnesium sulfate
- Sedation and other anticonvulsants
- Dilantin
- Diuretics to treat pulmonary edema if present
- Furosemide (Lasix)
- Digitalis: For circulatory failure
- Intensive nursing care
- DELIVER
- If fetus <34 weeks give corticosteroids to fetal lung maturity
HELLP Syndrome
- Hemolysis
- Elevated Liver enzymes
-
Low Platelets
- Platelets aggregate at sites of vascular damage
- Be ready to administer platelets if <20 x109/L
- Epidural anaethesia may not be an option if low platelets
- Mother might present with headache, nasuea, vomiting, RUQ pain, tired, increased BP
Disseminated Intravascular Coagulation (DIC)
- Can be caused by pre-exlampsia, hemorrhage, intrauterine fetal demise, amniotic fluid embolism, sepsis, HELLP, other medical conditions
- Over-activation of normal clotting mechanism
- Mini clots develop
- Depletes platelets and clotting factors → excessive bleeding
Pregnancy, Insulin, and Glucose
- During early pregnancy, there is a decrease in maternal glucose levels because of the heavy fetal demand for glucose. The fruts is also drawing amino acids and lipids from the mother, decreasing the mother’s ability to synthesize glucose. Maternal glucose is diverted across the placenta to assits the growing embryo/fetus during early pregnancy. As a result, maternal glucose concentrations decline to a level that would be considered “hypoglycemic” in anon-pregnant woman. During early pregnancy there is also a decrease in maternal insulin production and insulin levels.
- The pancreas is responsible for the production of insulin, which facilitates entry of glucose into cells. Although glucose and other nutrients easliry cross the palcenta to the fetus, insulin does not. Therefore, the fetus must produce its own insulin to facilitate the entry of glucose into its own cells.
- After the first trimester, hPL from the placenta and steroids (cortisol) from teh adrenal cortex act against insulin. hPL acts as an antagonist against maternal insulin, and thus more insulin must be secreted to counteract the increasing level of hPL and cortisol during the alst half of pregnancy.
- Prolactin,e strogen, and progesterone are also thought o possie insuline. As a reuslt, glucose is less likely to enter the mother’s cells and is more likely to corss over the placenta to the fetus.
Gestational Diabetes
- Incidence between 3 to 20%
- Pre-existing diabetes
- Developes after 20 weeks
- Gestationla diabetes GDM
- Glucose intolerance in pregnancy
- 3.5% of non-Aboriginal women and up to 18% of Aboriginal women
- Pre-existing not previously diagnosed
- Increased risk of stillbirth, comorbid hypertension, injuries at delivery (larger baby), risk of developing type 2 diabetes
What are the 2 ways that pregnancy alters carbohydrate metabolism in gestational diabetes?
- Fetus continually takes glucose from the mother
- Placenta creates hromones, which alter effects of and resistance to insulin and glucose tolerance
Carbohydrate Metabolism
- Is a diabetogenic effect of pregnancy
-
First Trimester of Pregnancy
- Rise in hormones stimulate insulin production and increase tissue response to insulin
- In the 1st trimester insulin needs frequently decrease
-
Second and Third Trimester of Pregnancy
- Placental secretion of hPL begins
- Increase resistance to insulin and decrease glucose tolerance
- Insulin needs increase (may douple or triple by end of pregnacy)
- Increase insluin required ot maintian normal concentration
RESULTS IN
- Renal thershold for glucose decrease
- Progress of vascualr disease may be accelerated