Maternity Part 2

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cmatthews
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267673
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Maternity Part 2
Updated:
2014-03-24 18:16:24
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BC CRNA Advanced principles Maternity Part2
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Alans second lecture 3/24/14
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  1. What are the three stages of labor?
    • 1st stage: Latent Phase (less than 4cm dilation of cervix) and Active Phase (greater than 4cm dilation of the cervix)
    • 2nd stage: Complete dilation until delivery (involves descent of the fetus through the pelvis and out the vaginal canal)
    • 3rd stage: delivery of the placenta
  2. During the first stage of labor, where is the pain coming from?
    Visceral pain from uterine contractions and resulting cervical dilation and effacement (shortening and thinning of the cervix) innervate the spinal cord at T10-L1 nerve roots
  3. During the second and third stage of labor, where is the pain coming from?
    caused by the descent of the the fetus and ultimately the placenta through the stretching pelvis and peritoneal structures also innervate the spinal cord at the S2-S4 nerve roots
  4. Name the non-pharmacologic analgesia for labor
    • Lamaze
    • Brady
    • Dick-Read
    • LeBoyer
    • Hypnosis
    • Accupuncture
    • Biofeedback
    • TENS Unit (Transcutaneous Electrical Nerve Stimulation)
  5. How much morphine would you give IV for analgesia for labor?
    2-4mg Q3-4 hours --EARLY in labor, don't want baby coming out under the influence :)
  6. How much Dilaudid would you give for analgesia for labor?
    1-2mg IV/IM Q1-2hrs
  7. How much Demerol would you give for analgesia for labor?
    • 10-25mg IV
    • 20-50mg IM 
    • Q2-3hrs with MAX DOSE of 100mg
  8. How much Fentanyl (IV) would you give for analgesia for labor?
    25-50mcg IV Q30-60min
  9. Nubain and Stadol aren't seen as much but what is the dosing for analgesia for labor?
    • Nubain 10mg IV Q3-6hr
    • Stadol 1-2mg IV Q3-4hr
  10. How much Ketamine would you give for analgesia for labor?
    Ketamine 10-15mg IV (Max dose of 1mg/kg)
  11. Why are opioids typically used early in labor (at least 4 hours prior to delivery)?
    Nearly all opioids analgesics readily corss the placenta and can affect the fetus (respiratory depression/acidosis and sedation)
  12. Ketamine may be avoided because of the unpleasant psychedelic and hallucinogenic effects. When is it helpful???
    Used as a rescue for a patchy block
  13. The most common and manageable side effect of Labor epidurals is hypotension secondary to sympathetic blockade and resulting vasodilatioin. How do we treat this?
    • Increased IV fluids
    • Ephedrine 5-10mg 
    • Phenylephrine 40mcg

    Titrate to effect
  14. Placement of an epidural should only take place where (....in the hospital)
    Only attempt in a location where complete anesthesia equipment and resuscitative drugs are available
  15. What are the ABSOLUTE contraindications to epidurals
    • Patient refusal
    • Coagulopathy/Thrombocytopenia
    • Skin infection at injection site
    • Raised intracranial pressure
    • Hypovolemia
  16. What are the relative contraindications to epidurals?
    • Uncooperative patients
    • Pre-existing neurological disorders (MS)
    • Fixed Cardiac Output states (AS, CHB, MS, hypertrophic obstructive cardiomyopathy)
    • Anatomical abnormalities of the vertebral column
    • Patients with a history of previous back surgery
  17. After performing a physical assessment and obtaining consent, what should we administer prior to placement?
    Nonparticulant anatacid prophylaxis (30cc Bicitra) and 500-1000ml of LR fluid bolus
  18. What is the typical depth from skin to the lumbar epidural space
    approximately 5cm
  19. How far into epidural space do you thread the catheter?
    3-5cm
  20. Does a negative aspiration negate a potential intrathecal/intravascular placement of your epidural catheter?
    No! It could still be misplaced!
  21. What is the test dose for epidural catheter placement?
    Lidocaine 1.5% and Epi 1:200,000 (3cc) so 45mg of Lidocaine and 27mcg Epinephrine
  22. If you gave the test dose and the epidural was intrathecally placed, how could you tell?
    Lidocaine would give a fast onset of T8-T10 spinal block
  23. If you gave the test dose and the epidural was intravascularly placed, how could you tell?
    Epidural would give you an increase in HR and BP (unless the parturient is betablocked)
  24. After you've successfully placed your epidural catheter and given you test dose, what do you give for a bolus?
    • 5cc of 0.25% Bupivacaine and 100mcg of Fentanyl 
    • Begin frequent monitoring of BP for signs of hypotension
  25. What is a typical concentration and rate for an epidural for labor?
    • 0.1% Bupivacaine and Fentanyl 2-5mcg/ml at 6-10ml/hr
    • Continue monitoring the patient for 15-20min then Q2-3hrs for adequate analgesia & proper motor function & signs of hypotension
  26. How can you treat inadequate analgesia as labor progresses (after you've placed the epidural but before the patient is pushing)?
    Additional boluses of 0.25% Bupivacaine 5-10ml
  27. How can you treat inadequate analgesia as labor progresses (epidural is in and the patient is about to start pushing)?
    50-100mcg of Fentanyl  to avoid bolusing local anesthetics and taking away some motor function
  28. When removing the epidural (after checking with surgeon that there is no uterine atony or  bleeding), what should you check to ensure the catheter is intact??
    Check and document the black tip of the epidural catheter is intact
  29. What happens if you have an intrathecal catheter instead of an epidural catheter?
    • give 1/10th the mg volume dose!
    • Clearly label as INTRATHECAL
    • Communicate with everyone that is intrathecal
  30. For spinal analgesia for labor, a combination of preservative free opioids is used, why?
    • Morphine 0.15-0.25mg (slow onset of 30-60min but lasting duration of 4-6hrs) 
    • Fentanyl 12.5-25mcg (fast onset of 1-3 min but only lasts 1-2hrs)
  31. Maternal hypotension is rarely seen when giving spinal analgesia (opioid only), why might you see some mild decreases in BP?
    as a resullt of decreased circulating endogenous catecholamines (pain relief)
  32. what is a common side effect of intrathecal narcotics?
    • itching
    • N/V
  33. What change in fetal heart rate might you see after a spinal analgesia for labor?
    • Drop in fetal HR (early decelerations) as the fetus rapidly descends through the pelvis and is now relaxed
    • (Apgars remain high despite the changes in fetal HR)
  34. What helps REDUCE (but not eliminate) the risk of Post Dural Puncture Headaches?
    Use of a small guage, pencil point spinal needle (Pencan 25G or Whitacre 25G)
  35. Why are spinal catheters not used?
    continuous spinal catheters were associated with cauda equina syndrome
  36. What is cauda equina syndrome?
    characterized by varying degrees of persistent saddle anesthesia, sphincter dysfunction resulting in bowel or urinary problems, & rarely paraplegia
  37. How do the baroreceptors influence fetal HR?
    • influence the fetal HR through the vagus nerve in response to change in fetal BP
    • Almost any stressful situation in the fetus evokes the baroreceptor reflex which elicits peripheral vasoconstriction and HTN with resultant bradycardia (just like phenylephrine does)
  38. What do the chemoreceptors do?
    Chemoreceptors located in the aortic and carotid bodies respond to hypoxia, excess CO2, and acidosis producing tachycardia and HTN
  39. What is the normal fetal HR?
    110-160bpm
  40. Why do we like variability in the fetal HR?
    Baseline variability reflects a healthy nervous system (the baroreceptors and chemoreceptors are responding to the changes and stress of labor appropriately)
  41. Fetal prematurity decreases variability in the HR, so there is little rate fluctuation before how many weeks???
    28weeks
  42. When should fetal HR variability be normal (at how many weeks)?
    After 32 weeks
  43. Sustained decreased baseline variability is a potential sign of what?
    fetal asphyxia and thus is a nonreassuring FHR
  44. What are fetal HR accelerations?
    15 or more beat/min increase lasting for more than 15sec
  45. Are accelerations normal?
    • Yes they are considered reassuring
    • Reflect normal oxygenation and are related to fetal activity in response to uterine pressure
  46. Is absence of accelerations normal?
    No! Absence of accelerations is nonreassuring
  47. What are early decelerations?
    10-40 beats/min decrease should be simultaneous to contractions and are the result of the vagal reflex to head compression
  48. Are early decelerations good or bad?
    Good, they are reassuring
  49. What are late decelerations?
    onset is 10-30sec after start of contraction & end 10-30sec after contraction ends
  50. What are late decelerations a sign of?
    • Uteroplacental insufficiency
    • Hypoxemia
    • Fetal myocardial ischemia
  51. Are late decelerations life threatening to the fetus?
    • YES! All late decels are considered potentially threatening to the fetus!
    • Late decels w/a decrease in variability are nonreassuring
  52. What are variable decelerations?
    • variable in depth, shape and duration
    • Acute fall in FHR w/a rapid down  slope and a variable recovery phase 
    • Vary in duration, intensity and timing & may bear no constant relationship to uterine contractions
  53. What are variable decels a sign of?
    • Head or umbilical cord compression
    • Occur frequently in patients who have experienced premature rupture of membranes and decreased amniotic fluid volume
  54. What is the MOST COMMON fetal heart rate pattern during labor?
    Variable decelerations are the most commonly encountered patterns during labor
  55. Variable decelerations are caused by compression of the umbilical cord, which occludes the vein and artery which results in what?
    • Initially occludes the vein causing acceleration and indicates a healthy response
    • Occlusion of the artery, results in the sharp down slope
    • Recovery phase is d/t relief of the compression and the sharp return to baseline, which may be followed by another healthy brief acceleration
  56. Variable decelerations may be classified according to their depth and duration, describe mild, moderate, and severe
    • Mild: 80bpm lasting less than 30sec
    • Mod: 70-80bpm and lasts 30-60sec
    • Severe: below 70bpm and lasts more than 60sec
  57. Variable decelerations are generally associated with a favorable outcome. However, what can persistent deceleration pattern mean?
    • If it's not corrected, may lead to acidosis and fetal distress, therefore it is non reassuring
    • Non-reassuring variable decelerations are associated with the loss of beat to beat variability correlate substantially w/fetal acidosis and therefore represent a threat to the fetus
  58. What are the reassuring patterns of fetal heart rate?
    • Mild variable decelerations (less than 30sec and rapid return to baseline)
    • Early decelerations (concurrent "mirror image" decrease w/contraction)
    • Accelerations without other changes
  59. What are the nonreassuring patterns of fetal heart rate?
    • Decrease in baseline variability
    • Progressive tachycardia (>160)
    • Decrease in baseline FHR
    • Intermittent late decelerations w/good variability
  60. What are the ominous patterns of FHR?
    • Persistent late dcelerations; esp.w/decreased variability
    • Variable decelerations w/loss of variability, tachycardia, or late return to baseline
    • Absence of variability
    • Severe bradycardia (60-80bpm)
  61. What sensory level do we need for a C sec?
    T4
  62. At T4 sensory level, what kinds of HD changes will we see?
    • High sympathetic blockade and profound vasodilation and potential bradycardia
    • (Cardiac accelerator originates from 1st-5th thoracic spinal nerves)
  63. What kind of fluid bolus would we give prior to the initiation of the block for a Csec?
    1000-1500ml of LR
  64. We get BP Q1min after imitation of the block for Csec, how do we treat hypotension?
    Ephedrine 5-10mg or Phenylephrine 40-80mcg
  65. What might you warn the patient about prior to placing a block for Csec (think respiratory)
    Quiet respirations causing the patient to feel that she can not breath adequately
  66. What do you do if you're patient states they can't breathe after blocking for a Csec?
    • Reassure them
    • Assess for tingling or weak ability to grasp the hands as this implies a low cervical blockade (C5,6,7) and the potential for an increasingly high spinal/epidural
    • Ability to lift the head implies that the muscles of accessory breathing are intact
    • When in doubt, get them off to sleep (RSI) and establish GETA
  67. With ROUTINE SCHEDULED Csec what block is preferred?
    Spinal because it is faster placement and consistent dense sensory and motor blockade
  68. What is the typical spinal dose for a Csec?
    • Hyperbaric Bupivacaine 0.75% (7.5mg/ml) is 10.5-15mg
    • Some people add Fentanyl 12.5mcg or Morphine 0.15mg
  69. A true Crash emergent Csec is happening, when do you induce GETA?
    After confirmation of surgical team readiness because incision happens right after you secure the airway
  70. How do you dose a patient who has an epidural in place and needs a Csec?
    a labor epidural can be dosed in 5ml increments w/15-20ml of either Chloroprocaine 3% or an alkalinized 2% PF Lidocaine (1ml of NaBicarb 8.4%/10ml of Lido)
  71. Why don't we add epi to our epidural dosing for C sec?
    because it will slow the onset of the block!
  72. What happens if the labor epidural catheter migrates intrathecal or intravascular and results in a high spinal or toxic blood level?
    Tx w/RSI GETA
  73. How do we treat a patchy or inadequate sensory level labor epidural?
    • IV Ketamine 10-25mg or 30-50% of N2O
    • Surgeon may also infiltrate w/Lidocaine
    • If all else fails=RSI GETA
  74. How long should ELECTIVE Csec fast?
    at least 6hrs prior to any anesthetic
  75. Increased risk of aspiration and greater incidence of difficult airway in the parturient, how can we make the situation optimal?
    • Nonparticulant antacid (30ml Bicitra)
    • Consider use of Heine flex-tip MAC blade w/short handle to avoid the breasts
    • Downsize cuff ETT (5.5-6)w/stylet
    • Ramp patient to facilitate optimum extension of head and thus better view during intubation
  76. After induction and ETT placement, how do we provide GETA?
    Maintenance of anesthetic w/potent inhalation agent on 100% oxygen (1.5MAC for 1st min then 2/3 to 1/2 MAC+N2O50-70%)
  77. Are the use of short term low concentration inhaled agents associated w/decreased uterine activity, increased uterine bleeding, or neonatal depression?
    NOOOOO
  78. What might we give after the delivery of the fetus and placenta?
    • Antibiotics (now given pre-incision)
    • Oxytocin 20U/L PSR
    • Methergine 0.2mg IM or Hemabate 0.25mg IM PSR for uterine atony
  79. How do we assess neonatal respirations and HR?
    • Respirations assessed by ascultation at a rate of 30-60/min
    • HR assessed by palpation at the base of the cord @ 120-160bpm
  80. What is a normal APGAR? Moderate impairment? Needs resuscitation?
    • Normal 7-10
    • Moderate impairment 4-6
    • Needs Resuscitation 0-3
  81. Resuscitation is needed in ___ of births
    ~6%
  82. About ___% of parturients will require non-ob surgery during their pregnancy
    2
  83. What are the common non-ob types of surgery the parturient might have?
    • cerclage (reinforcement of cervix)
    • various laparoscopic procedures (gall bladder)
  84. How long should elective surgeries be postponed after delivery?
    6 weeks
  85. What teratogens that we should avoid giving the parturient getting non-ob surgery?
    • Benzodiazepines (cleft palate)
    • N2O (decrease uterine blood flow)
    • Ketamine (controversial, may have oxytocic effects on the uterus)
    • **Esp in 1st trimester
  86. During non-ob surgery on the parturient, how can we maintain placental perfusion?
    • avoid maternal hypotension, hypovolemia, anemia, hypo/hypercarbia, acidosis, exogenous/endogenous catecholamines
    • *ABOVE ALL MAINTAIN MATERNAL OXYGENATION*
  87. During non-ob surgery for the parturient, we should assess and intervene at first signs of perterm labor, how?
    tocolytics (Ritodine and Terbutaline)
  88. When should we do FHR monitoring?
    Pre and post-op after 10-16 weeks gestation
  89. When must we do RSI for GETA in the parturient?
    after 10 weeks
  90. When should we maintain uterine dipslacement during non-ob surgery in the parturient?
    In supine position after 24 weeks gestation
  91. what is placenta previa?
    PREvents or blocks fetal delivery involves  the placenta blocking some or all the cervical os
  92. What does placenta previa typically presents w/ what?
    • painless vaginal bleeding, in fact all parturients w/vaginal bleeding are assumed to have previa until proven otherwise
    • Active bleeding or an unstable patient/fetus require immediate C/S (plan for a large volume loss case!)
  93. what is placenta accreta, placenta increta, and placental percreta?
    • Placental accreta: adheres to uterine surface
    • Placental Increta: invades the uterine muscle
    • Placenta Percreta: completely invades uterine muscle and surrounding tissue)
  94. what is Abruptio Placentae?
    • invovles the premature separation of the life-giving placenta from the uterine wall
    • PAINFUL vaginal bleeding
  95. What are the risk factors for Abruptio Placentae?
    HTN, trauma, short umbi cord, multiparity, prolonged rupture of membranes, cocaine, and ETOH abuse
  96. Can we do regional for a Abruptio Placentae?
    • Depends, choice based on degree of fetal health/distress, maternal HD stability, and potential coagulopathy
    • SEVERE abruptio requires Emergency RSI GETA C/S and aggressive volume management
  97. How does uterine rupture typically present?
    • loss of uterine tone, bleeding, and fetal distress
    • Sudden painful event will often overtake the analgesics of a labor epidural
    • Tx: hysterectomy w/aggressive volume management
  98. What is the most common cause of post-partum hemorrhage?
    • uterine atony
    • Other causes: tocolytic agents, multiple gestation, retained placenta (usually partial) lacerations, and uterine inversion
  99. When is REGIONAL anesthesia contraindicated?????
    PATIENTS W/HYPOVOLEMIA (bolded on his notes!)
  100. What three medications may be used to treat post-partum hemorrhage?
    • Oxytocin
    • Methergine
    • Hemabate
  101. What is oxytocin?
    • The uterine myometrium contains receptors specific to oxytocin 
    • Oxytocin sitmulates the contraction of uterine smooth muscle and thus impedes uterine blood flow
    • The # of receptors (therefore response) gradually increases throughout pregnancy and peaks at term
  102. Does oxytocin effect maternal BP?
    Minimal changes
  103. What is the usual concentration of oxytocin?
    20-30U/L
  104. What is the dose of Methergine?
    0.2mg IM
  105. What is Methergine?
    • Semi-synthetic ergot alkaloid
    • Uterine and smooth muscle constrictor
  106. Will methergine increase maternal BP?
    yes
  107. What is the does of Hemabate?
    0.25mg IM
  108. What is Hemabate?
    • Form of prostaglandin
    • Uterine and smooth muscle constrictor
  109. Does Hemabate effect maternal BP?
    can mildly increase BP
  110. What are the causes of umbilical cord prolapse?
    • premature and artificial rupture of membranes (most common)
    • Malpresentation
    • Low birth weight
    • excessive cord length
    • multiparity
    • multigestations
  111. What is the treatment for umbilical cord prolapse?
    • immediate Csec (RSI GETA) combined w/manually pushing the cord and possible presenting fetal appendage back up into the pelvis
    • Parturient may be placed in knee chest position or steep Tburg to help w/fetal perfusion
  112. What is dystocia or ineffective labor caused by?
    • inadequate uterine contractions
    • abnormal fetal presentation 
    • cephalopelvic disproportion
  113. What is a prolonged latent phase defined as?
    • >20hrs primip
    • >14hrs  in multip
    • Cervix remains dilated to 4cm or less but completely effaced
  114. during the active phase of labor the cervix should dilate "some" at least every __hrs
    2
  115. What is the treatment of choice to help increase the frequency and strength of contractions?
    Oxytocin
  116. What is the most common abnormal fetal presentation?
    BREECH!
  117. Why might we place an epidural prior to external cephalic version (for breech presentation)?
    • 1) it can be uncomfortable for the mom
    • 2) can result in placental abruption/fetal distress which could require immediate Csec (why we wait until 36 weeks to do it)
  118. What is the mortality rate for amniotic fluid embolism?
    80% and a 50% death rate within the 1st hour of occurance
  119. What does amniotic fluid contain that causes an embolism to be so dangerous?
    desquamated fetal tissue, prostaglandins, meconium, leukotrines all f which cause severe maternal anaphylactic reaction
  120. What are the s/s of amniotic fluid embolism?
    • Sudden respiratory distress (tachypnea, cyanosis)
    • CV collapse and bleeding
    • Even if stabilized, DIC usually progresses after
  121. What is the treatment of an amniotic fluid embolism?
    • aggressive CPR
    • Stabilization and supportive care
  122. What is the risk of uterine rupture with VBAC?
    0.2-1.5%
  123. What should we do 0-24hrs following dural puncture for a PDPH?
    • encourage fluid intake to increase CSF production
    • IV caffiene
  124. Is an epidural patch typically performed within the first 24 hrs after a dural puncture?
    no
  125. What is the treatment for a PDPH 24-48hrs following dural puncture?
    • continue conservative management if it doesn't interfere w/daily activities
    • if that doesn't work then an epidural blood patch is the gold standard
  126. What is the objective of an epidural blood patch (how does it help PDPH)?
    • Creates a blood clot over the hole in the dura, CSF leak can be slowed or halted entirely
    • Possible the EBP works by increasing the pressure in the spinal cord
  127. How much blood do we need for an epidural blood patch?
    15-20ml of autologous blood
  128. How effective is the epidural blood patch?
    95%
  129. What are the complications of an epidural blood patch?
    • back pain
    • neck pain
    • leg pain
    • paresthesias
    • radiculitis
    • fever
    • temporary cranial nerve palsies

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