TEST 3 Flashcards
Children exhibit different pharmacokinetics from adults because of their (4) reasons
Lower protein binding (more free drug = greater effect)
Larger volume of distribution (Vd) “jellyfish” (required larger loading dose of water soluble meds to achieve clinical effect)
Smaller proportion of fat and muscle stores (less redistribution into muscle/fat mass = large initial blood concentration)
Immature renal and hepatic function (less metabolism and elimination)
(MM) What drugs will have a LARGER volume of Vd in the infant compared with the adult?
What drugs will have a SMALLER volume of Vd in the infant compared with the adult?
Water soluble drugs = LARGER Vd
Lipid soluble drugs = SMALLER Vd
Along with the factors and individual differences in drug metabolic enzymes in children, a drug’s metabolism may be ____ and/or ______ elimination.
In some cases, it may ______ metabolism.
Reduced
Delay
Increase
Pharmacokinetics in children, some medications may displace bilirubin from its ____ ____ ____ and possible predispose an infant to ____.
Protein binding sites
Kernicterus
Pharmacokinetics: it is important to carefully ____ of all medications that are administered to ____ and ____ infants to the desired response.
Titrate doses
Preterm and term
There are (2) reasons why neonates require a ____ dose of succinylcholine compared with the adult. Neonates have a ____ Vd for succinylcholine than adults.
Higher
Larger
___ -____% of body weight of neonate is extracellular fluid (ECF) whereas in the adult ECF is only ____-____ of the body weight.
40-50%
20-25%
_____ distributes in the ECF volume-so more drug is needed on a per kg basis.
Succinylcholine
The neuromuscular junctions in neonates are ____ (less sensitive or more resistant to its neuromuscular effects), so more SUX is needed to compete with ACh at the NMJ.
Immature
Neonates require ____ as much succinylcholine on a body weight basis than older children or adults.
TWICE
The neonate has a ____ sensitivity to nondepolarizing NMB agents than the adult and would require a ____ amount of the drug.
GREATER
Smaller amount
Nondepolarizing NMBs acts as a ____ ACh antagonists at the ____ neonatal NMJ.
Competitive
Immature
Neonates/infants have a ____ Vd for muscle relaxants and would require a ___ amount of the drug.
greater Vd
Greater amount of the drug
The ____ Vd (normally requiring a greater amount of drug) is offset by the ____ sensitivity of nondepolarizing muscle relaxants at the NMJ.
Increased
Increased
Neonates, infants, children require the ___ dose of nondepolarizing neuromuscular relaxants as adults on a weight basis.
Same
CNS effects: Lab data have demonstration that the ____ (lethal dose in 50%) for many medications to be significantly less in the neonatal animals than ___ animals.
LD 50
Adult
CNS effects: the sensitivity of human neonates to most the sedatives, hypnotics, narcotics is clinically well known and may be in part related to ____ or ___ for some medications
Increased brain permeability
immature BBB
___ ____ in infants may make it easier for drugs that are not particular lipid soluble to enter the brain at a greater rate than if the BBB were intact.
Incomplete myelination
Volatile concentration INCREASES more rapidly in alveoli in children than adults. That results from (3) things
High level of alveolar ventilation (Va) in relation to FRC)
Higher proportion of vessel-rich tissues that rapidly equilibrate with blood vessels
Lower blood-gas partition coefficients of volatile anesthetics in infants
Excretion/recovery of inhaled anesthetics is also ___ in children than adults.
Quick __ -> Quick ___.
Faster
Quick on -> Quick Off
What kind of a drug is toradol?
NSAID with potent analgesic properties
What age can you start using ketorlac?
Age of 2
What can toradol be used as?
An adjuvant to opioid analgesia to reduce potential respiratory depression/ PONV or for treatment of mild to moderate pain
What patients should you use ketorlac with caution in?
Patients with renal problems, reduced renal blood flow and in asthmatic patients (allergic reactions to NSAIDS)
Why does ketorlac have potential for post op bleeding?
Inhibition of platelet function through inhibition of cyclooxygenase
Compared to Asa, ketorlac’s platelet inhibition is _____________ and is gone when ______________________ .
Platelet inhibition is reversible and is gone when the drug has been excreted
Should you ask the surgeon before you give ketorlac?
Yes ask if there is any contraindication because the increased risk of bleeding.
How should ketorlac be drawn up?
In a TB syringe be careful to not overdose
What is the concentration of ketorlac?
1mL/30 mg
If drawing up in TB syringe each increment = how many mg?
Each increment = 3 mg
IV dose of ketorlac?
0.5mg/kg IV
Max 30 mg
IM dose of ketorlac?
0.5-1mg/kg
Max 30 mg
What is the dose of narcan?
0.001 mg/kg
1mcg/kg
What kind of drug is narcan?
Pure opioid antagonist and is rapidly effective in reversing opioid induced side effects.
What side effects of opioids does narcan reverse?
Respiratory depression N/V pruritus urinary retention constipation
What is the concentration of narcan in the vial?
0.4mg/ml
How do you dilute narcan?
Dilute 1 ml: 0.4mg/ml in 9 mL NS; will make it 40 mcg\ml
With Narcan, Respiratory depression may be reversed with as little as ________ mcg/kg although larger doses (up to _______ mcg/kg) may be required
1-10
Up to 100
Why do we use small doses of narcan?
To reverse the respiratory depression without reversing the analgesic effects
Why can resedation occur after giving narcan?
The elimination HL of narcan is shorter than the HL of most opioids
What should you do if resedation occurs after narcan?
Repeat the same dose IM and monitor closely
What are the major side effects of narcan?
Hypertension Cardiac arrhythmias (including v fib) Pulmonary edema (non cardiogenic)
What kind of a drug is flumazenil (Romazicon)?
GABA receptor competitive antagonist that reverses the effects of benzodiazepines
Does flumazenil work on opiods?
No
What is the concentration of flumazenil?
What is the dose of flumazenil?
1mg/10mL
0.01mg/kg or 10 mcg/kg
What are the adverse affects with flumazenil?
N/V Blurred vision Sweating Anxiety emotional liability
Because elimination HL of flumazenil is _____________ than the HL of most benzodiazepines, ____________ can occur.
Shorter
Resedation
What should you do if resedation occurs after flumazenil administration?
Repeat the dose and monitor closely
Dose of roc for RSI?
0.6-1.2 mg/kg
Rocuronium induction IV dose?
0.45-0.6mg/kg
Cisatracurium dose?
0.1-0.2 mg/kg
Pancuronium dose?
0.1mg/kg
Is rocuronium long/intermediate acting? Is it a non depolarizer/depolarizer?
Intermediate acting
Non depolarizer
Does rocuronium have cardiovascular or histamine release?
No rocuronium is without cardiovascular and histamine effects and similar to vecuronium
What is the dose of rocuronium?
- 6 mg/kg (good intubating dose)
1. 2 mg/kg for RSI
How is rocuronium eliminated?
Eliminated by the liver; only 10% is excreted by the kidneys
Neonates appears to be more sensitive to Roc than older infants? T/F?
True
What is the DOA of rocuronium?
90 minutes after 0.6 mg/kg
What kind of drug is cisatracurium?
Intermediate non depolarizer
What hemodynamic affects does cisatracurium have?
Minimal histamine release; stable hemodynamics
What is the intubating dose of cisatracurium?
What is the duration of action
0.1-0.2 Mg/kg
DOA 35 minutes
The duration of action of nimbex is unaffected by renal or hepatic failure and is therefore drug of choice for renal or hepatic patients? T/F?
True
How is nimbex eliminated?
Hoffman elimination and ester hydrolysis
Vecuronium is a depolarizing NMB agent. T/F?
False; non depolarizer
How long is the duration of action of vecuronium in children and small infants?
35-45 min in children
60-70 min in small infants
Does vecuronium have cardiovascular side effects?
No and metabolites seem not to have CNS effects
How is vecuronium metabolized?
By the liver and excreted in bile
What can prolong the action of non depolarizer NMB?
Tobramycin, neomycin, gentamicin, and hypothermia
What is the dose of vecuronium?
0.1mg/kg
What drug class is pancuronium (Pavulon)?
Longer acting non depolarizer NMB agent and is preferred when increased HR and BP is desired
What surgery is pancuronium desired, and why?
Pancuronium
Because HR and BP increased is desired
What can pancuronium cause in pre term infants?
Sustained tachycardia
HTN
Increased plasma epinephrine level
Some concern of increased risk of intracerebral hemorrhage
What is the dose of pancuronium?
0.1mg/kg
Each following dose should only be 10-20% initial dose
How is Panc excreted in the kidneys?
In the kidneys; prolonged NMB with renal impairment may occur
Dexamethasone dose for antiemetic?
0.1mg/kg Max 10 mg
Dexamethasone dose for airway?
0.5mg/kg max 10 mg
Why should NDMB always be reversed?
What 3 things can happen if patient is not reversed?
Because residual muscle paralysis will impair respiration and may result in hypoxemia, hypercapnia and acidosis.
What patients can inhibit the antagonism of NDMB?
Hypothermia can inhibit antagonism making neostigmine not fully effective
What antibiotics can prolong effect of NDMB?
Neomycin
Gentamicin
Tobramucin
In neonates and infants it is very easy to judge if twitches are present. T/F?
False; it is difficult
What are some clinical signs that patient/child is reversed?
Ability to flex hips/arms
Lift legs
Return of abdominal muscle tone
What is the dose of neostigmine?
What is the dose of glycopyrrolate?
0.07 mg/kg
10 mcg/kg
What drugs does sugammadex reverse?
Roc or vec
What is the recommended dose of sugammadex after 2 twitches have returned?
2mg/kg
What is the recommended dose of sugammadex after 1-2 post tetanic twitch revocery (no response to TOF)
4mg/kg
Can you use sugammadex for RSI dose of roc or vec?
No! ROC reversal only
For RSI- ROC reversal _________ mg/kg if there is a clinical need to reverse NM blockade soon ( approx. _____ minutes) after single dose of ___________ mg/kg of ROC.
16 mg/kg
3 minutes
1.2
What cardiac affects have been seen after administration of bridion/sugammadex?
Cardiac arrest and marked bradycardia
What drug does sugammadex compete with and patient education is very important?
Hormonal contraceptives, female patients who have received sugammadex during GETA are not protected for 7 days and can become pregnant
Does atropine of glycopyrrolate have more CNS effect?
Atropine crosses BBB; glycopyrrolate has minimal CNS effect
What drugs are used to offset the muscarinic effects of neostigmine for reversal of NDMB?
Glycopyrrolate
Atropine
Atropine and glycopyrrolate are used to treat bradycardia with oculocardiac reflex and dry up secretions (drooling with ketamine). T/F?
True
What drug should be used cautiously in Down syndrome because narrow angle glaucoma?
Atropine may worsen glaucoma and needs to be administered cautiously
What are the 3 5 HT3 (serotonin) receptor antagonists?
Odansetron (zofran)
Granisetron (kytril)
Dolasetron (anzemet)
Odansetron is used for prophylaxis and treatment of PONV and to reduce the severity of established N/V. T/F
True
What is the dose of odansetron?
0.1 mg/kg up to 4mg
How can odansetron be given?
IV, IM or orally
What can improve the efficacy of preventing PONV if given together?
Odansetron and dexamethasone
Children less than _______ months of age don’t require antiemetics in general (exceptions could be: pt is 1.5 yrs and had an emetogenic surgery (eyes, ears, T&A, abdominal)
24
When should you give the anti emetic dose of dexamethasone?
Early and give zofran before then end of the case
When should you avoid dexamethasone?
Patients who are newly diagnosed with leukemia/lymphoma and other hematologic malignancy
What is acute tumor lysis syndrome?
Occurs when rapidly dividing large volume tumors (i.e highly aggressive lymphomas and acute leukemia) are treated with cytotoxic agents inducing cell death of malignant tissues
Acute tumor lysis syndrome is characterized by what?
The rapid development of hyperkalemia, hyperuricemia, hyperphosphatemia, hypocalcemia and lactic acid may terminate in renal failure in a patient who may have a hematologic malignancy
It is okay to give dexamethasone to a patient with acute tumor lysis. T/F?
False it is like pouring oil on fire
What are amides degraded by?
Cytochrome p450
What are amides?
Lidocaine, mepivacaine, bupivicaine, levobupivacaine, ropivacaine, etidocaine
How are esters broken down?
By hydrolyzed by plasma cholinesterases
What are the esters?
Procaine
2 chloroprocaine
Tetracaine
Max dose of bupivacaine with epi
2.5mg/kg (max 175 mg)
Max dose of bupivacaine with epi PF caudal?
2.5 mg/kg
Max 175
What is the max dose of lidocaine without epi infiltration
4.5 mg/kg
What is the max dose of ropivacaine?
2.0 mg/kg
With 0.25% Bupivacaine with epi = 2.5 mg/mL -> give 1mL/kg
.
With 0.2% ropivacaine = 2mg/ml -> give 1mL/kg
.
What is epinephrine (adrenaline) IV used to treat?
Cardiac arrest
Hypotension
Heart failure
Dose and how often should you dose epi?
10 mcg/kg Q 3-5 minutes
Infusion dose of epi?
0.01- 1 mcg/kg/min
Dose of epinephrine to treat bronchospasm
1-2 mcg/kg IV to treat bronchospasm
___ speeds up induction and emergence (second gas effect). ___ might be a cause analgesia for ____.
Nitrous Oxide
Nitrous Oxide
Difficult IV sticks
Any gas-filled cavities within the body are vulnerable for expansion if nitrous oxide is administer including (5) things.
Obstructed Bowel
Pneumothorax
Cuff of ETT
LMA
Bubble veins
Theoretically, ___ __ should be avoided during laparoscopic surgery to avoid expanding ____ ___ that reach the venous circulation.
Nitrous oxide
CO2 bubbles
The appropriate concentration of oxygen to be delivered for each anesthetic should be carefully titrated to an _____ ______. Oxygen is often liberally administered in ___ of patient’s metabolic needs.
Individual’s needs
Excess
____ is considered one of many factors causing retinopathy of prematurity (ROP) in infants weighing less than 1500 gm or less than 28 wks gestation.
Hyperoxia
It is recommend to ___ __ with O2 to maintain SpO2 of 90-95% (even during transport of premature neonates)
blend air
However, while avoiding hyperoxia, one must never lose sight of the importance of avoiding _____.
Hypoxemia
____ is life-threatening whereas hyperoxia is not.
Hypoxemia
One cannot be ___ if ROP occur, provided a reasonable and safe approach to ___ administration and ventilation has been made.
Faulted
Oxygen
Check for a ____ ____ ___ before you give any medication to a girl who has reached 12 years of age or younger than 12 years if patients is post menses.
Negative Pregnancy Test
____ is NOT appropriate for inhalation induction due to its pungent odor which ______ airway reflexes and causes what three things.
Isoflurante
Irritate
Laryngospasm
Breath-holding
Coughing
Isoflurane is a profound ____ depressant. Rapid increase in ISO concentration decrease what 3 things especially in hypovolemia.
respiratory depressant
Decreased BP, HR, RR (especially in hypovolemia)
ISO (like DES) reacts with desiccated ___ ___ or ___ to release carbon monoxide into breathing circuit
Soda Lime
Baralyme
_____ has a very low blood solubility and the CV effects are similar to ISO.
Desflurane
Like ISO, ____ is not suited for inhalation induction, because of its very ___ odor and is irritant to the airway, and causing what (3) things
Desflurane
Pungent
Laryngospasm
Coughing
Breath-holding
Emergence from DES is very ___ and may result in ___, particularly if ___ is present.
Rapid
Delirium
Pain
DES interacts with desiccated ____ ___ or ____ and may produce potentially toxic concentration of ____ ___.
Soda Lime
Baralyme
Carbon Monoxide
____ is excellent for inhalation induction, has somewhat ____ odor and does NOT cause ____ irritation.
SEVO
Pleasant
Airway
With SEVO, CV and respiratory effects are similar to ____.
ISO
Emergence from SEVO is ___ and ___. Risk of emergence delirium is ___ if pain is not well controlled and high levels of ___ were given throughout the case.
Smooth and Rapid
Increased
SEVO
What is a dissociated state of consciousness which children are inconsolable, irritable, uncompromising, and/or uncooperative?
Emergence Delirium
During emergence delirium, many of the children ___ to recognize and respond ____ to their parents.
Fail
Appropriately
Incidence of emergence delirium (ED) after inhalation anesthesia in children ranges from ___ -____% (similar prevalence with SEVO, DES, ISO and less with HALO)
2-80%
The highest incidence of emergence delirium occurs in children __-__ years of age.
1-5 years
Appropriate ___ ___ often attenuates emergence delirium.
Pain relief
____ is hydrolyzed in the presence of soda lime/Baralyme to a potentially nephrotoxic Compound A.
SEVO
Studies with ___ suggests that SEVO may be administered in a closed circuit for up to ____ MAC-hrs before nephrotoxicity is a serious risk. Keep flow at ____ L/min.
Primates
25 MAC-hrs
2 L/min
All ___ ___ ___ and ___ trigger MH reactions in susceptible adults and children.
Potent anesthetic volatiles
Succinylcholine
In 1993, the FDA issued a __ __ warning against the routine use of SUX in children and adolescents except for ____ ____ ____.
“Black box” warning
Emergency airway management
Sux black box warning was based on several case reports of ____ and primarily in children with undiagnosed ___.
Hyperkalemic cardiac arrests
Undiagnosed Ducchenne muscular dystrophy
Hyperkalemia cardiac arrests and children with undiagnosed duchenne muscular dystrophy has a staggering mortality rate of ___%.
55%
Sux hyperkalemic cardiac arrest occur in what type of population?
Male children 8 years and younger
The use of succinylcholine should be reserved for ___ ___ or instance where immediate securing of the airway is necessary like in these (4) circumstance.
Emergency intubation
Larygospasm
Difficult airway
Full stomach
Intramuscular route when a suitable vein is inaccessible
In the presence of hypoxemia with partial or complete upper-airway obstruction. Give _____ IV Sux or ____ IM Sux.
And apply what?
0.1-1 mg/kg IV Sucs
4 mg/kg IM Sucs
Positive pressure ventilation
Sux is infrequently associated with an increase in ____ ___ tone “trismus” and is considered a trigger for _____.
Masseter muscle tone
MH
What circumstances do you avoid Succinylcholine?
Avoid SUX in eye trauma: Increase IOP (intraocular pressure)
Avoid SUX in children with burns (burns older >24 hrs)
massive trauma
major neurologic disease (neuromuscular disease)
renal failure compounded by neuropathy
With succinylcholine, Serum K+ concentration increases ___ mEq/L or less after IV Sux in normal children, however, life-threatening K+ can occur after __ single dose.
1 meq/L
1 single dose
Single dose of SUX can occasionally cause ___ and ___ in children.
Bradycardia
Asystole
What do you give prior to administering Sux?
Atropine IV 10-20 mcg/kg
Atropine IM 20-40 mcg/kg
Minimum of 100 mcg Atropine
Propofol is a short-acting ____, with a _____ recovery; however longer exposure to propofol might prolong ___ due to redistribution in fat cells.
Hypnotic
Pleasant recovery
Emergence