Oral Surgery Test Review Flashcards
The following are associated with the extracellular space:
- Na+
- K+
- Cl-
Na+
Is there more?
Na+, Cl-, Bicarb
The following are associated with the Intracellular space:
- Na+
- Cl-
- K+
K+ and proteins
small amounts of Na+ Cl- and Bicarb
??????
_______ _______ is where local anesthesia exert their pharmacological actions
Nerve membrane
______ ______ ______: Local anesthesia bind to specific receptor on the
Na channel
SPECIFIC RECEPTOR theory
Nodes of Ranvier: Sodium channel is_______.
abundant
How Local Anesthesia Work?
• Decrease permeability of ion channels to Na
• Nerve block by local anesthesia is a
Non-depolarizing block
T/F: nerves have a quicker conduction than un-myelinated. AND….
Adelta and A Alpha (about 120 m/sec) are faster than C fibers (1.2 m/sec) .
true
Where does local anesthesia work at myelinated nerve?
the nodes of ranvier
Is local anesthesia hydrophilic or they like oily stuff?
Hydrophillic (injectable)
t/f: only the free base form of LA can diffuse through the wall of the nerve.
true
t/f:
↑ pKa translate to slow onset
true
t/f:
↓ pKa will have faster onset
true
t/f: Extracellular pH determines the ease for nerve blockade
true:
So, since: RNH = RN+H+
does the higher pH (more H+ shift the equation to RNH which cannot cross neerve membrane like free base can. This results in less effective LA?
t/f:
Greater lipid solubility relates to intrinsic potency
true – Nerve membrane is 90% lipid
t/f:
Increased protein binding will increase duration
true – Nerve membrane is 10% protein
Lipid Solubility influences: _______
potency
pKA influences: _______
onset
Protein Binding influences: ________
Duration
↑ Tolerance to drug after repeated administration
Tachyphylaxis
what are the Different classes of local anesthesia
Ester and Amide
______ most potent vasodilator
Procaine
_______ : the only local anesthetic with constrictor effect
Cocaine
_____ ______ has greatest % of anesthetics
Skeletal muscle
How do you calculate elimination half life?
Time needed for 50% reduction in blood level
- 1st t ½ 50%
- 2nd t ½ 75%
- 3rd t ½ 87.5%
- 4th t ½ 94 %
_______ local anesthetics cross blood-brain barrier, and placenta
ALL LA
How ______ metabolize in the body:
- Hydrolyzed in plasma by pseudocholinesterase into paraaminobenzoic acid (PABA)
Ester Metabolism
How ______ metabolize in the body:
- Primary biotransformation site is Liver
- Liver function/ hepatic perfusion influence
Pharmacology of Local Anesthesia Metabolism biotransformation
– Relative contraindication for
• ASA IV to V patient with liver dysfunction, heart failure
Amide Metabolism
Would CHF or Liver failure increase Ester availability, but decrease amide availability.
Please call or text me. I seriously have no clue.
_______ are primary excretory organ
Kidneys
Initial clinical signs/symptoms of CNS toxicity are________!
Excitatory
Further______ in toxicity leads to cessation of seizure activity:
respiratory depression
reparatory arrest
increase
What are the stages/ signs of local anesthesia over dose / toxicity?
– Numbness of tongue and circumoral region (symptoms)
– Slurred speech, shivering, A/V disturbances, Disorientation, tremor.. (signs)
– Luckily, lidocaine don’t have these s/s but mild sedation or drowsiness
the follow are examples of _____ _____:
Epinephrine
Norepinephrine
Dopamine
natural catecholamines
The following are examples of ______ ______:
Isoproterenol
Levonordefrin
synthetic catecholamines
the following are examples of ___-_____:
Amphetamine, Ephedrine, Methamphetamine
Non-catecholamines
All Cathecholamines work on adrenergic receptors with______ acting
direct
Adrenoceptors:
Vasoconstriction increased peripheral resistance increased BP mydriasis increased closure of internal sphincter of the bladder
Alpha 1
Adrenoceptors:
inhibition of norepinephrine release
inhibitiomn of insulin release
alpha 2
Adrenoceptors:
tachycardia
increased lipolysis
increased myocardial contractility
beta 1
Adrenoceptors:
vasodilatation
slightly decreased peripheral resistance
bronchodilation
increased muscle and liver glycogenolysis
increased release of glycogen
relaxed uterine smooth muscle
beta 2
In a ratio for epinephrine dilution, 1: 100,000
the 1= ______ mg
1000 mg
do the following question:
Epinephrine dilution:
a)
1: 300,000
vs.
b)
1: 200,000
Which one is more concentrated
a) 0.00333333333 mg/ml
b) 0.005mg/ml
B is more concentrated
_________:
Lack significant B2 actions • Intense vasoconstriction Almost exclusive alpha action • Dramatic elevation of blood pressure 9X higher than epinephrine
norepinephrine
1) Blood pressure in excess of 200 mmHg systolic or 115 mmHg
Contraindication of vasoconstrictor
2) Uncontrolled hyperthyroidism
Contraindication of vasoconstrictor
3) Severe cardiovascular disease
a) Less than 6 months after myocardial infarction
b) Less than 6 months after cerebrovascular accident
c) Daily episodes of angina pectoris or unstable angina
d) Cardiac dysrhythmias despite appropriate therapy
e) Postcoronary artery bypass surgery (CABG), less than 6 months
Contraindication of vasoconstrictor
4) Undergoing general anesthesia with halogenated agents
Contraindication of vasoconstrictor
5) Patient receiving nonspecific B-blocker, MAOi, Tricyclic antidepressants
Contraindication of vasoconstrictor
Using the categories provided, which patients are considered ASA 4 risks and are not normally considered candidates for elective or emergency dental treatment in the office.
1) Blood pressure in excess of 200 mmHg systolic or 115 mmHg
2) Uncontrolled hyperthyroidism
3) Severe cardiovascular disease
a) Less than 6 months after myocardial infarction
b) Less than 6 months after cerebrovascular accident
c) Daily episodes of angina pectoris or unstable angina
d) Cardiac dysrhythmias despite appropriate therapy
e) Postcoronary artery bypass surgery (CABG), less than 6 months
4) Undergoing general anesthesia with halogenated agents
5) Patient receiving nonspecific B-blocker, MAOi, Tricyclic antidepressants
1-3d
Do patient OD if your exceed MRD?
not always but the chances are definitely increased.
t/f: Maximum calculated drug dose should decrease in medically compromised, debilitated, or elderly persons
true
That’s correct. Disadvantaged people are slower in metabolizing these
drugs. So you need to decrease the MRD on them
Which drug?
Onset of action: rapid (2-3 mins)
Anesthetic t ½ : 1.6 hours
Maximum Recommended Dose (MRD)
4.4mg/kg (Council on Dental Therapeutics of the ADA and USP convention)
Absolute maximum 300mg
8 Cartridges will be the maximum # used on a patient
Healthy patient, maximum epinephrine is 0.2mg or 200mcg
Cardio patient , maximum epinephrine is 0.04mg or 40mcg
Lidocaine
Which drug?
Healthy patient, maximum epinephrine is 0.2mg or 200mcg
Cardio patient , maximum epinephrine is 0.04mg or 40mcg
lidocaine
Which Drug?
Maximum Recommended Dose (MRD)
4.4mg/kg (Council on Dental Therapeutics of the ADA and USP convention)
Absolute maximum 300mg
8 Cartridges will be the maximum # used on a patient
lidocaine
which drug?
Onset of action: rapid (2-3 mins)
Anesthetic t ½ : 1.6 hours
Lidocaine
Which drug?
Onset of action: Rapid (1.5 to 2 mins) Anesthetic t ½ : 1.9 hours Maximum Recommended Dose ( MRD): 4.4mg/kg Absolute maximum 300mg 5.5 cartridges will be maximum # used on a patient
Mepivacaine
Which drug?
Onset of action: Rapid (1.5 to 2 mins)
Anesthetic t ½ : 1.9 hours
Mepivacaine
Which drug?
Maximum Recommended Dose ( MRD):
4.4mg/kg
Absolute maximum 300mg
5.5 cartridges will be maximum # used on a patient
Mepivacaine
Which Drug?
Onset of Action: slightly slower (2-4 mins)
Anesthetic t ½ : 1.6 hours
Maximum Recommend Dose:
6.0mg/kg
Absolute Maximum 400mg
5.5 cartridges will be the maximum # used on a patient
Prilocaine
Which drug? Onset of Action: Longer 6-10 mins occasionally similar to lidocaine Anesthetic t ½ : 2.7 hours (Long Duration) Maximum Recommended Dose: 1.3mg/kg Absolute maximum 90 mg 10 cartridges is the maximum # used on a patient
Bupivacaine
Which Drug?
Onset of Action: slightly slower (2-4 mins)
Anesthetic t ½ : 1.6 hours
Prilocaine
Which Drug?
Maximum Recommend Dose:
6.0mg/kg
Absolute Maximum 400mg
5.5 cartridges will be the maximum # used on a patient
Prilocaine
Which Drug?
Which drug?
Onset of Action: Longer 6-10 mins
occasionally similar to lidocaine
Anesthetic t ½ : 2.7 hours (Long Duration)
Bupivacaine
Which Drug?
Maximum Recommended Dose:
1.3mg/kg
Absolute maximum 90 mg
10 cartridges is the maximum # used on a patient
bupivacaine
Which Drug?
Onset of Action:1-2 mins infiltration
Anesthetic t ½ : 0.5 hours
Maximum Recommended Dose:
7mg/kg
Articaine
Which drug?
Onset of Action:1-2 mins infiltration
Anesthetic t ½ : 0.5 hours
Articaine
Which Drug?
Maximum Recommended Dose:
7mg/kg
Articaine
Articaine is ____% concentrated
articaine is 4% concentrated
The following are contraindications to which drug?
Patient allergic to amide type anesthesia (few to none)
Sulfite sensitivity
Caution with hepatic disease
Patient with significant impairments in cardiovascular function
Children < 4 y/o is not recommended due to insufficient data
articaine
t/f: Articaine cannot be used on children 4 y/o and younger.
true
t/f: After 55 years of clinical use, 2% lidocaine with 1:100,000 epinephrine is still the closest to the ideal intermediate-duration local anesthetic in dentistry.
true
t/f:
Healthy patient, maximum epinephrine is 0.2mg or 200mcg
Cardio patient , maximum epinephrine is 0.04mg or 40mcg
true
What is the most common cause of failure to acheive adequate anesthesia?
anatomical variation and faulty technique
t/f: the smaller the gauge the bigger the diameter of the needle
true
Can we use needle on more than one pt?
no
t/f: the needle should be covered with the protective sheath when not in use.
true
What technique do you use to recap the needle?
the scoop technique
are you ever to bend the needle?
no never
t/f: Larger gauge does not = higher gauge.
higher gauge = smaller diameter.
Larger gauge is wider diameter.
super confusing. but high is not a size descriptor.
true
it is recommended to use 25- or at
least 27-gauge needle.
this reduces the chance of needle breakage.
true
Which bacteriostatic agent was removed from LA cartridge in 1984?
methylparaben
No manufacturer claim of sterility about exterior surface
of the cartridge
Bacterial culture tested fail to produce any growth
Cannot withstand extreme temperature
No autoclaving especially plastic cartridge
When heated, vasopressors are destroyed
Store in room temperature in a dark place
Study showed no benefit of using cartridge warmer
Do NOT soak cartridge in alcohol or “cold sterilizing
solution”
Semipermeable diaphragm permits diffusion of these solution
Read the drug package insert
Care and Handling of Cartridge
t/f: never soak cartridge in sterlizing solution
true
t/f: Most common psychogenic reactions
Vasodepressor syncope
Hyperventilation
true
Cimetidine + ASAIII CHF = ______
contraindication for amide local anesthesia
or is it (malignant hyperthermia and methemoglobinemia)
relative contraindication
Epinephrine-impregnated gingival retraction cord is ______ contraindicated in the cocaine abuser
Postpone dental treatment, if suspected cocaine
usage within 24 hours
absolutely conraindicated
_______ Contraindication with local
anesthesia
Malignant Hyperthermia
Methemoglobinemia (to Prilocaine)
Relative Contraindication
\_\_\_\_\_ \_\_\_\_\_\_ with local anesthesia Malignant Hyperthermia Methemoglobinemia (to Prilocaine) Cimetidine + ASAIII CHF = relative contraindication for amide local anesthesia
Relative Contraindication
Where does the ophthalmic (v1) branch go through?
superior orbital fissure
where does the maxillary branch (v2) go through the skull?
foramen rotundum
where does the mandibular (v3) branch of the trigeminal nerve pass through?
the foramen ovale
One of the branch of CN V (trigeminal nerve), upon exiting cranial base, make a quick 180 degree turn back into cranium. This nerve provides sensory innervations to the dura mater. Its_____________ nerve.
middle meningeal nerve
the ______ branch of the trigeminal nerve is both sensory and motor.
mandibular (v3)
psa stand for?
posterior superior alveolar
PSA Nerve Block Areas Anesthetized;
Maxillary molar tooth pulps
MB root of 1st molar in (NOT ALWAYS slide says 72%)
Buccal periodontium and bone
Which Maxillary injection procedure is described here:
- Insert needle at the height of vestibule
- This insertion is 45 degrees upward, backward and in.
- insert to 16mm depth
- ASPIRATE
- if - aspiration, then Inject 0.9ml-1.8ml
- if + aspiration, remove slightly and reposition. we want - aspiration
Posterior Superior Alveolar Nerve Block
t/f: you always aspirate with PSA nerve block
true
t/f: a disadvantage of PSA nerve block is the disfiguring hematoma risk
true
Which Nerve Block? Present in some patients Premolars MB root of 1st molar in 28% Buccal periodontium and bone
Middle Superior Alveolar Nerve block
Which Nerve Block technique is described?
- insert the needle with the bevel facing the bone well above the premolar apices
- apsiration is optional?
- inject 0.9-1.2 ml
Middle Superior Alveolar Nerve Block (MSA)
Which Nerve Block? Areas Anesthetized Maxillary central through canine Premolars MB root of first molar in 28% of patients Buccal periodontium and bone Lower eyelid, side of nose, upper lip
Anterior Superior Alveolar Nerve
(ASA)
aka
Infraorbital Nerve Block
- Locate the Foramen by Palpation
- Foramen ~ 16 mm Above Vestibule
- Insertion Depth ~ ½ Long Needle
- insertion for this nerve is almost always in line with the pupils.
- Orient Needle Bevel Towards Bone
- Insert Gently Until Bone Contacted this is the roof of the infraorbital foramen
- Aspirate and Inject 0.9 to 1.2 ml
- Maintain Pressure During Injection
- Maintain Pressure One Minute After Injection
ASA
anterior superior alveolar Nerve block
Which injection? Areas Anesthetized Tooth Buccal periodontium and bone Labial or buccal mucosa
Supraperiosteal Injection (Local Infiltration)
Which local infiltration is described below:
- Insert Superior to Root Apex
- Orient Needle Bevel Towards Bone
- Inject 0.6 ml of anesthetic
Supraperiosteal injection
Which Nerve Block ? Areas Anesthetized Posterior portion of hard palate Overlying soft tissues No anesthesia of teeth
Greater Palatine Nerve Block
Which nerve block Areas Anesthetized Anterior portion of hard palate Both hard and soft tissues No anesthesia of teeth
Nasopalatine Nerve Block
Which nerve block is described?
- apply topical for 2 min to the soft tissue covering the greater palatine foramen
- Move Applicator Over Foramen – Apply Direct Pressure 30 Seconds
- Place Needle Bevel Against Tissue and Bow the Needle
- Administer a Few Drops of Local
- Straighten and Advance the Needle, contact bone, but do not go into foramen
- Aspirate, Deposit 0.45 to 0.6 ml
Greater Palatine Nerve Block
Which nerve block is described?
- Apply Topical for Two Minutes
- apply direct pressure
- Contact Bone, Administer 0.45 ml
Nasopalatine Nerve Block
What is the name of the other approach to nasopalatine nerve block?
Transpapillary Approach
Which nerve block?
- Apply Topical Lateral to Frenum
- Blanching of Labial Tissue
- Insert Through Papilla Towards Palate
- Administer 0.3 ml Into Papilla
nasopalatine nerve block trans-papillary approach
t/f: the anterior branch of the mandibular nerve gives rise to the muscles of mastication.
true
t/f: the buccal branch is a branch of the anterior branch, and is in a league of its own. You really have to numb it if you want to take care of buccal tissue around mandibular molars
true
What are the two major branches from the posterior branch of the mandibular nerve?
inferior alveolar and the lingual
Which Mandibular nerve Block?
Tissues Anesthetized • Gingiva buccal to molars • Retromolar pad mucosa • Buccal mucosa in molar area • NO hard tissues anesthetized
Buccal Nerve Block
t/f: The injection site for the buccal nerve block is just buccal to the molars.
true
Which mand Nerve block is described?
- find injection site: just buccal to molars (looks like on occlusal plane
- Injection – 25 Gauge Long Needle
- during injections, stretch the tissue
- contact periosteum
buccal nerve block
________ Innervates Anterior 2/3 of Tongue and Innervates Lingual Mucosa
lingual nerve
What is the largest branch of the posterior division?
inferior alveolar nerve (IA)
Which Mandibular nerve block is described?
- Syringe at Level of Coronoid Notch
- Syringe Directed Across Arch
- needle penetrates buccinator muscle and lateral to the Pterygomandibular Raphe
- dry injection site
- apply topical
- wait one or two minutes with topical
- Finger on Notch Retracts Cheek and Determines Height of Injection
- Barrel of Syringe in Corner of Mouth
- Aspirate, Inject 1.5 ml over 60 Sec.
- Insert~25mm to Contact Bone
- Withdraw Halfway, Deposit 0.1 ml at Lingual Nerve
Inferior alveolar nerve block
Which nerves are Anesthetized with the Inferior Alveolar Nerve Block?
- Inferior alveolar
- Incisive
- Mental
- Lingual (usually)
- All of the above
all above
areas Anesthetized with IA nerve block include:
- entire quqadrant of dentition
- entire quadrant of lingual mucosa
- incisor to 2nd pm of buccal mucosa
- 1/2 of tongue
- all above
all above
which mand nerve block is described?
- Palpate the Mental Foramen (xray)
- site of injection is the depth of the vestibule
- dry and apply topical
- bevel to bone
- Insert into Tissue Over Foramen.
- Deposit 0.6 ml over 20 seconds.
Mental nerve block
Areas Anesthetized by ____ ____ _____
• Mucosa anterior to foramen
• Skin of the lower lip • Chin
mental nerve block
In Gow-Gates nerve Block:
the needles contacts ____ __ _____
neck of condyle
What are the two extra oral landmarks for the gow-gates nerve block?
corner of mouth
intertragic notch
Which mand Nerve block is described?
- Wide Opening, Condyle Moves Forward
- Needle Puncture Point Dictated by Intra-oral Landmarks
(corner of mouth and the intratragic notch) - Advance Until Bone Contacted
- Withdraw 1 mm, Aspirate, Inject 1.8 ml
Gow Gates
_________ Nerve Block Nerves Anesthetized
• Inferior Alveolar • Lingual • Mylohyoid • Auricolotemporal • Buccal (in 75 %)
Gow-Gates
Which mand nerve block is described?
- Closed Mouth
- Height of Injection: Maxillary Muco- Gingival Line
- Direct parallel to ramus
- Insert to 25 mm depth
- Aspirate, Inject 1.5 to 1.8 ml
Vazirani-Akinosi Nerve Block
Vazirani-Akinosi Nerve Block Nerves Anesthetized:
• Inferior Alveolar
• Lingual
• Mylohyoid
- all above
all above
list the following in order of highest on the condyle?
highest at top of list
gow gates
Vazirani-Akinosi Nerve Block
IA