Final Flashcards
Cardiac and CNS toxicity may occur virtually simultaneously in infants and children due to
Lower threshold for cardiac toxicity with bupivacaine
CNS and CV signs of LA toxicity include
Circumpolar numbness
Paresthesias
Lightheaded
Tinnitus
Seizure
Respiratory depression/arrest
Ventricular arrhythmia
Cardiac arrest
Why is resuscitation effort after bupivacaine toxic dose difficult
Bupivacaine has affinity for Na, K, and Ca channels
Bupivacaine is highly bound to plasma proteins specifically what 2 proteins
Alpha 1 acid glycoprotein
Albumin
Lower levels of plasma proteins leads to what with bupivacaine
Increased free (unbound) fraction of LA that produces toxicity
After accidental injection of large IV dose of bupivacaine progression from prod royal signs to CV collapse timeline
May be rapid
To terminate seizure activity what drugs given
Midazolam 0.05-0.2 mg/kg
Thiopental 2-3mg/kg
If cardiac arrest from LAST think
Treatment of choice
Intralipids
Dose of intralipids
1.5ml/kg of 20% IV lipid emulsion
Max dose of intralipids
3ml/kg
Maintenance infusion rate of intralipids
When stop?
0.25 ml/kg/min
Until circulation restored
Is propofol recommended as substitute for intralipids for LAST
No
Supportive treatment of LAST with intralipids
IVF 10-20ml/kg isotonic
Vasopressors (NE or neo)
Antiarrythmic
Phenytoin
ECMO
Conus medularis is located where in peds
Adults
L3 in peds up to 1 yr old
L1 adults
Lumbar puncture for SAB/spinal in neonates and infants is performed at what level
L4-L5
L5-S1
Avoid needle injury to SC
Tip of spinal cord in neonate ends at what level
When achieves normal adult position of L1-L2
L3
1 year of age
Neonatal sacrum differences from adults
Narrower and flatter
LP in older child may be performed where
L2-L3
L3-L4
L4-L5
L5-S1
At birth spinal cord ends at what level
L3
LP in infant may be performed at what levels
L4-L5
L5-S1
Presence of deep sacral dimple may be associated with
Spina Bifida Occulta
Presence of deep sacral dimple implications with caudal anesthesia
Greatly increases probability of dural puncture
Caudal block contraindicated
CSF volume as percentage of body weight in infants/young children compared to adults
Greater in infants/young children
CSF turnover rate for infants and children compared to adults
Greater turnover rate
Greater turnover rate of CSF in peds results in what changes in SAB
Much briefer duration compared to adults
SAB and epidural in infants and small children has what hemodynamic effect
Hemodynamically stable even when reaches upper thoracic levels
Why clinically significant BP changes do not occur in young children with SAB and epidural
PNS stronger than SNS
What position is patient placed into for caudal epidural
Lateral decubitus position
Palpate what for caudal epidural
Cornu of sacral hiatus
Found at the beginning of the crease of the buttocks
Appropriate insertion site of caudal epidural
Slightly more caudal from palpate sacral Cornu
What size IV cath for caudal block
22G
Needle direction initially for caudal block
45 degrees cephalad bevel down
Needle passes through what ligament for caudal block
Sacrococcygeal ligament
What space is caudal block placed into
Caudal canal
Continuous with epidural space
If bone is encountered before sacrococcygeal ligament do what
Withdraw several mm
Decrease angle to 30 degrees
Gently advance
As advance needle for caudal block what adjustments to angle
Decreased angle and nearly parallel to plane of child’s back
Intraosseous injeciton of LA results in what uptake
Very rapid uptake
Similar to direct IV injection
Drug dose for epidural blockade to a given dermatome level depends on what
Volume not concentration
Concentration of LA for epidural should be based on what
Desired density of block
Risk of toxicity
Where does spinal cord end in neonate
Lower border of L3
Neonate is undergoing surgical procedure with spinal. What would indicate high or total spinal?
Decreasing sat is earliest sign
Respiratory insufficiency rather than hypotension
CV markers stable bc PNS dominant
What is maximum dose of 0.25% bupivacaine that should be used for pediatric caudal anesthesia
How long anesthesia provided
1 ml/kg up to max of 25ml
Provides 3-6 hours for procedures below the diaphragm
Appropriate volume for pediatric epidural blood patch
Awake
Anesthetized
Awake- stop when child feels discomfort or pressure
Anesthetized- max 0.3ml/kg
Leading cause of death an disability in peds
Injuries
Up to 40% of polytrauma patients die as a result of what
Circulatory shock from acute blood loss
Besides surgical control of hemorrhage what is crucial for survival
Adequate volume resuscitation with blood products and IVF
Most common cause of death from injury for victims of all ages
Traumatic brain injury
Major threat to children in US
Vehicular trauma
Initial management and definitive care of child with traumatic head injury is focused on
Optimizing cerebral perfusion
Why optimize cerebral perfusion
Minimize extension of injury
Maximize recovery of damaged neuron
Managing extracranial injury simultaneously
Primary goals in management of peds trauma pt (9)
Delivery of oxygen
Appropriate ventilation
Vital organ perfusion
Normothermia to mild hypothermia
Assure renal function
Neurological stability
Correct coagulopathies
Avoid overhydration
Meticulous mgmt of metabolic demands
In emergency and shortage of 0- blood boys can receive what type
B+
Prepare for trauma patient with what in regards to weight
Estimated weight
Lidocaine bolus and infusion
1mg/kg bolus
20-50mcg/kg/min infusion
Adenosine dose
100 mcg/kg rapid bolus
Max 6 mg
200mcg/kg second dose
Max 12 mg
Amiodarone dose
5mg/kg
Max 300mg
VF and VT
Procainamide dose
5-15 mg/kg over 30-60min
Then 20-80mcg/kg/min infusion
Magnesium IV dose
25-50 mg/kg
Max 2 gm
Torsades
Calcium chloride dose
10-20mg/kg
Central line. Slowly
Stronger. More Ca per ml
Calcium gluconate dose
30-60mg/kg
PIV ok
Epinephrine
Hypotension
Cardiac arrest
1 mcg/kg hypotension
10mcg/kg arrest
Atropine max dose
Child
Adolescent
Child 1 mg
Adolescent 2 mg
No time for type and cross what blood given
O PRBCs
AB platelets and plasma
Women of childbearing potential should receive what type of blood
O negative RBC
Men and women post-childbearing age could receive what type
0 positive PRBCs
PRBCs 4 ml/kg increases Hgb bu how much
1g/dL
What dose of PRBCs increases Hgb by 1 g/gL
4 ml/kg
Platelet transfusion of what dose increases platelet count 50K-100K
5-10 ml/kg
FFP transfusion of how much increases factor level by 15-20%
10-15ml/kg
Platelet infusion of 5-10ml/kg will increases platelet count by how much
50,000-100,000
FFP transfusion of 10-15ml/kg increases factor level by how much
15-20%
Cryoprecipitate given to increase what level
Fibrinogen
Cryo dose of 1-2 units/kg increases fibrinogen how much
60-100 mg/dL
To increase fibrinogen by 60-100mg/DL dive how much cryo
1-2 units/kg
Lethal trauma triad of death
Coagulopathy
Acidosis
Hypothermia
How coagulopathy leads to acidosis
Increased lactic acid in blood
How acidosis to hypothermia
Decreased heart performance
Hypothermia to coagulopathy
Decreased coagulation
Platelets should/should not be refrigerated
NOT
If overt signs of bleeding present or more hemostatic challenging procedure imminent what platetlet level may be required
30,000 to 50,000/mm3
Platelet should be give through what type of filter
Large-pore filters
> 150nm
FFP contains what
All clotting factors and regulatory proteins
What patients could benefit from higher FFP:RBC ratio of 1:1
Massively transfused patients
Increased FFP transfusions to massively transfused patients associated with
Trend toward increased mortality
Increased risk of TRALI
Rapid administration of FFP can cause
Citrate toxicity
S/S hypochloremia
Hypotension and arrhythmias
Citrate intoxication may be more likely in setting of
Hypothermia, liver disease/transplantation
More likely in pediatric patients
Citrate is mainly metabolized where
Liver
Citrate has what effect in blood stream
Binds calcium
Cryoprecipitate contains what factors
Factor VIII
Von willebrand factor
Factor XIII
Cryoprecipitate indicated for what
Factor XIII deficiency
Dysfibrinogenemia
Hypofibrinogenemia
MABL formula
EBV X (Hct-maHct)
—————————-
Hct
Minimum accepted Hct (maHct)
Cryoprecipitate contains how much factor VIII from original plasma unit
20-50%
Formula for volume of PRBCs to be transfused
EBV X (desired Hct - current low Hct)
————————-
Hct of PRBCs- 60
Hct of unit of PRBCs
60
Child with severe pulmonary disease or cyanotic heart disease requires ___________ Hct than healthy child
Higher Hct
Preterm infants may require _______ Hct
Greater
Why do preterm infants require higher Hct
To prevent apnea
Reduce cardiac and respiratory work
Improve neurologic outcomes (possibly)
If little potential for post op bleeding Hct level of _____ is acceptable in healthy infants put to 3 months
20-25%
If little potential for post op bleeding what Hct is acceptable in older healthy children
> 3 months
20%
Risk of spine injury in peds patient is increased when child is subjected to (2)
Inertial forces from falls
Chaotic rotary forces from MVA
Any child with suspected neck injury should have
C spine precautions
_________ should always be maintained when airway manipulation attempted in suspected neck injury
In line stabilization
How many people may be required to intubate child with cervical fracture
Roles
4
1 for inline stabilization
1 to do intubation
1 for cricoid, hold ETT
1 to give drugs
Initial management of severe brain injury must first focus on
Actual pathophysiologic process that occurred at point of impact
Useful for initial and ongoing assessments of severity of CNS injury
GCS
Modified GCS for peds patients
Regardless of whether brain injury due to trauma or secondary due to global hypoxia there is
Immediate disruption of integrity of BBB
Results in cerebral edema and diminished neuronal oxygenation
Modified GCS for peds
Verbal response rankings
5- babbles, coos
4- cries but inconsolable
3- persistent crying or screaming in pain
2- grunts or moans to pain
1- none
Modified GCS is applicable to what patients
Eye opening and motor < 1 yr
Verbal response < 2 years
Children with head trauma may have minimal neurologic abnormalities at time of initial evaluation, however
Increased ICP and neurologic deficits may progressively develop
Increased ICP and neurologic deficits occur slowly in how many stages
2
2 stages of brain injuries
Primary insult
Secondary insult
Primary insult of deficit occurs when
Results from
Time of impact
Results from biomehcanical forces that disrupt cranium, neural tissue, and vasculature
Secondary insult of neurologic deficit is
Results from
Parenchymal damage caused by sequence subsequent to primary insult
Results from hypotension, hypoxia, cerebral edema, or intracranial hypertension
Ventilation of children with cerebral injury should maintain PaCO2
Between 35-40 mm Hg
Avoid/do mild hyperventilation in patient with cerebral injury
AVOID
Hyperventilation even mild should be avoided. Why?
Decreased blood flow to area surrounding injured area. Worsening flow to area
Calming the brain involves
Immediate administration of opioids and benzos
Seizure prophylaxis
alters neuro exam
What commonly given for seizure prophylaxis
Phenytoin
Phenobarbital
____________ should be considered when caring for children with AMS, Sz, or associated trauma requiring surgery
Basilar skull fracture
Findings associated with basilar skull fracture
Raccoon eyes
Retro auricular ecchymosis (battle sign)
Hemotympanum
Clear rhinorrhea
Otorrhea
Avoid what in possible basilar skull fracture
nasal intubation
NG tube
Acute subdural hematoma is most dangerous. Generally caused by what
Severe head injury
S/S of acute subdural hematoma occur when
Immediately usually
Due to rupture of usually veins between brain and dura
Subdural hematoma
Rupture of blood vessel between dura and skull
Epidural hematoma
Epidural hematoma
What BV usually rupture
Artery
As epidural hematoma expands leads to what s/s
Loss of consciousness
Hemiparesis
Pupillary dilation
Treatment of epidural hematoma
Prompt surgical evacuation
Medical therapy with epidural hematoma should be aimed at
Decreasing ICP
Acute subdural hematoma is almost always r/t
Trauma and frequently result of abuse
Shaken baby syndrome leads to what
Acute subdural hematoma
MOA of shaken baby syndrome
Infant so vigorously shaken that accelerating and decelerating rotational forces cause bridging veins to rupture
Blood vessels most susceptible with shaken baby syndrome
BV leading from brain to dura
In 50-80% of shaken baby syndrome what is presence
Unilateral retinal hemorrhage
Any bruises in what areas must be suspect for abuse
Buttocks
Groin
Neck
Cheeks
Age of children at highest risk for maltreatment and subsequent mortality
3 and under