L.A #7 By Bra2a Al-5a6eeb
JU.De :: 4th year :: Local Anesthesia
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L.A #7 By Bra2a Al-5a6eeb
http://www.mediafire.com/?tw0qzgq7gox683a
Local Anesthesia
Dr.suksyna
Lec # 7
2-11-2011
This lec is about local anesthesia contraindication and complication
No drug is without unwanted effect and most of therapeutics agent can’t be used with complete safety in all individuals coz there is a variations in the metabolism between individuals
So what are the contraindication for local anesthesia:-
1- Patient not cooperative
The basic in the local anesthesia is that the patient is cooperative ,if the patient is not cooperative we can’t go for local anesthesia.
What are the different types of patients management (we take them later on but usually we start with local anesthesia)
If local anesthesia was not successful we go for additional sedation.
Sedation : is a technique for controlling patient if L.A is not successful
If sedation is not successful we go for general anesthesia (we must know what are the indication and contraindication for general anesthesia)
- In last of this semester we will take 2 lect about sedation & general anesthesia but Usually we start our procedure with L.A
To enable treatment to be completed under L.A , collaboration is required but when the patient is not cooperative :-
a) Patient with mental or physical impairment
These patients can’t be treatment under L.A
Eg: patient with cerebrovascular accident .
These patients mange under general anesthesia after we sure that their status are suitable for general anesthesia then we go for proper management.
b) Very young children
-coz they can’t differ between painful and non painful condition
-uncooperative child cant mange him \her under L.A so go for general anesthesia
c) unreasonable patient
- this is in a few people
L.A واحد بحكيلك مستحيل أقدر انك تشتغلي تحت
If L.A impossible ->you can go for general anesthesia bus this mean we need more medication also hospital admitted & it’s more expensive
Q: when the sedition is not effective ?
Answer :if the patient is still not cooptation with sedation and Sometime the operation itself need general anesthesia not sedation so in such situations sedation is not effective
Sedation is used for minor procedure pluses / minuses
We use medazolam in the sedation which causes calm to the patient ,but If the patient has any respiratory problem ,sedation is contraindication
So sedation is contraindication when :-
1- The patient is still not cooperative
2- The operation itself need general anesthesia
3- The patient has respiratory problem
2) treatment factors
a) time consideration
Some time we have prolonged therapeutic sections , so we should go for general anesthesia not for local
b) Access problem
For example ,when we make a surgery for post. part of tongue or in the soft palate ,in these sites we can’t achieve well L.A so we go for general anesthesia.
c) Acute infection
- it reduced efficacy of L.A
-if u have a patient with acute infection and extended to the facial spaces specially if the patient has medical problem such as diabetic patient , L.A for this patient is danger on his/her life so u have to warn ur patient
sad story : one of dentists has prescribed antibiotics for diabetic patient and this mistake caused facial infection to the patient then she suffered from sepsis then shock ,stroke and finally the patient was died
- Patients with acute infection L.A not effective for them ,these patients need to be admitted to the hospital and treated under general anesthesia to make incision and drainage (we have to drainage the abscess)
Q: how the patient be not cooperative under sedation ??
Answer :v. possible that the patient is not cooperative under sedation coz sedation is like valum pill the patient is fully conscious under it
sedation just makes the patient calm and this calming depends on the patients pain threshold
d) Allergy
-not common
-some patients have allergy from L.A , for these patients L.A is absolutely contraindication u must go for general anesthesia
We have amide and ester type of L.A ,some patients have allergy from amide type others have allergy from ester type so we can’t go for that type of L.A which the patient has allergy from it
e) Medical condition
-L.A for patients that have medical problems is relatively contraindication
f) Poor bld supply
If ur patients have poor bld supply in any area ,u can’t go for L.A u have to go for general anesthesia
-the use of L.A containing vasoconstrictor should be avoided in the area where bld supply has been compromised
if u use L.A for these patients, u will not use a high concentration of vasoconstrictor (adrenalin) coz it will worsen the situation
For example , after radiotherapy in the treatment of malignancy , u should not use or reduce the L.A coz L.A cause ostionecrosis ( which is type of ostomilitis) and that cause sequestering in the jaw
g) Contraindication to specific technique
Some techniques of L.A have special contraindications:
Ø Bld diathesis
-Patients who has bleeding problem or bld problem such as patients with hemophilia , L.A for these patients is contraindication specially block anesthesia coz it cause bleeding
and it is contraindication to give these patients injection anesthesia in the floor of the mouth coz it easy to cause hematoma formation and it may expand to the air way space and compression it
**so patients with bleeding problem
1)Id block is contraindication
2)Infiltration in the floor of the mouth is contraindication
What the solution for these patients ??
Either give them infiltration injection (but not in the floor of the mouth) OR interligemantal injection(which part of supplemental injection techniques )
Ø Susceptibility to endocarditis
Patients with susceptibility to endocarditis we not give them interligemantal injection coz in the interligemantal injection we use force during giving solution and this force the pathogen and microbes to go to the bld stream then to the heart
Ø In complete root formation
Interligamental injection could be given to pediatric patients but the problem in the children is that they have incomplete root formation and we said before that interligamental injection is given under force so the tooth may go out from the socket which called tooth avulsion (this is a minimal case but it happen)
Ø Trismus
Some methods of anesthesia like Akinosi cause trismus
Trismus as u knew :is a limiting mouth opening
Ø Epilepsy / cardiac pacemaker
Patients with epilepsy or cardiac pacemaker or cerebrovascular diseases ,electronic anesthesia* for these patients should be avoided coz these patients have abnormality in the conduction and when we use electronic devise ,it will interfere with this electrical conduction
Electronic dental anesthesia*: is advanced technique which we use a special electrode that help u to achieve anesthesia ( we don’t have it in our university hospital coz it v.expensive (don’t worry about it coz usually we use conventional type of anesthesia )
H) in pregnancy
L.A in pregnancy is contraindication in the first trimester specially in the 2-8wks of pregnancy
Any dental work is contraindication in the first trimester ,so any dental work should be in the middle or 2nd trimester
Lidocaine is the safest L.A to be used
prilocaine the most diffusion
bupivacaine the least diffusion
Lignocaine?? & mepivacaine are intermediate
The best choice of local anesthesia in pregnancy is lidocaine .
Local complications
1- Local discomfort
Which is acceptable caz this is nature
U are increase the pressure of the fluid in the small area
2- interepithelial injection
it cause pain and may cause epithelium ballooning & to overcome this u should insertion the needle to submucosa
3- Sub –periosteal injection
such as palatal injection is painful coz u inject in non compliant tissue
4- Too rapid injection
u must give slow injection not rapid ideally the injection takes 30 sec in order to less the discomfort to the patient
5- Direct content with the nerve trunk
This happen with experience dentist
The patient feel electrical shock
6- Factor related to the solution
Temp and pH
pH of the local anesthesia is low and this may cause burning sensation to the patient specially if the L.A contain adrenaline
post injection pain
some patients are highly sensitive to injection specially palatal injection (which cause sloughing to the epithelium) and forceful injection .they cause desquamation and ulcer formation but this is variable between individuals
1- Sub-preiosteal injection
Result in disconnection of periostum from the bone and this is cause pain
2- Force of interligamental injection
This produce extrude of tooth and may cause desquamation to the epithelium and ulcer
- If failure of anesthesia happens that mean u have to do multiple insertion of needle and this cause pain in the injection area( the severity of the pain depends on how the patient receive this pain)
Neurological problems
1- Prolong altered sensation
-unfinishing sensation in the area of injection and this due to trauma to the nerve trunk via needle OR injection solution in the nerve trunk itself
2- Hemi-facial palsy
-to avoid this u must do eyes protection
-this is a temporary case (deleted when the anesthesia is washed out)
When u give Id block the anesthesia go to facial nerve then to the tail of parotid and this cause hemi-facial palsy
3- Visual disturbances
We have a reported cases
Patient has a blurred vision or diplopia or any of vision problems
-unilateral or bilateral
-temporary and could be permanent
we have 2 explanations of the permanent visual disturbances :
1)Anesthesia go to the origin of the artery then transmission to the ophthalmic artery to middle meningal artery to id bundle and this cause blurred vision
2) Anesthesia go to pterygoid plexus which is valveless then transmission by venous system
4- Aural disturbances:
Cause by interarterial injection of L.A which reach the internal auditory artery then reach to ophthalmic artery which causes temporary loss of function of optic nerve
5- Extensive paralysis
L.A reach to the external carotid artery then to the internal carotid artery and finally it reaches the brain and causes a temporary paralysis
**these complications mainly happen with Id block anesthesia
When we take the anatomy of arteries and nerves we studied them in 80% of people and this means that 15% of people different from what we were studied so u don’t guess what will happen
-to reduce these complications and go to the safe side u have to do aspiration before given anesthesia
Most complication of L.A
1) vasovagal attack :first mark of it patients color become paler
2) syncope
vascular problems
1- intravascular injection
2- hematoma formation
-it’s painful and we afraid from infection so u must give antibiotic if it happens
-it can cause by self infected trauma : when we give Id block and when u pull the needle out u inject the lips and cause trauma to them
3- trismus
4- infection : u must have a tray that ur instruments are put on it coz the surface is not clean ( may contaminated) and when u put the needle on it and then to the patient mouth for id block it causes infection to the patient
some theories say that the L.A may interfere with healing but the doctor doesn’t believe them
equipment failure
1- broken needle
if the needle break u shouldn’t play with it
2- cartridge failure
carpole itself is splatter or broken
it happen mainly with beginner and with pdl (interligamental injection) coz it is given with force and this may cause break to carpole
**so slow rate of injection is recommended
L.A systematic adverse effect
Toxicity
U need to know the does /weight u deal with and it different between indivisibly(adult ,child ,old)
Take in ur consideration if the patient has medically problem
Cardiovascular toxicity
1- excitation phase
start with elevation in the bld pressure and tachycardia
2- depression phase
negative ionotropic on the heart that affect cardiac output and stroke volume and this cause hypotension
3- Cardiovascular collapse
It happens to support theCardiovascular function
Treatment by: - fluid
- cpr
- o2
U have to lower the amount of anesthesia in the patient with Cardiovascular problem for example lidocaine we give 10 carpoles that contain it for adult healthy patients but for patients with cardiovascular problem maximum we give 4 carpoles to them
pediatric -> we give them 2 carpoles
Most local anesthesia they case depressant action of the heart
L.A may cause methameoglobinaemia (this is the main toxic effect of procaine which causes cyanosis)
Methameoglobinaemia is a hemoglobin which contains iron in the ferric rather than in the ferrous state let reduces the red bld cells oxygen carrying capacity
This cause : - cyanosis
- lethargy
- respiratory distress
How to deal with this condition??
By give the patient methalen blue
Methameoglobinaemia happen due to one of prilocaine metabolized….cause oxidation to ferrous ion (this is a Q in any universal exam)
May this condition happens with articaine and bupivacaine
The best treatment is prevention by :
1) aspiration before inject anesthesia
2) slow injection
3) dose limitation
CNS toxicity
Marks :
1- excitation phase
restlessness , preoral numbness if the patient feel them u should stop the procedure
2- convulsive phase
seizure
3- depression phase
with drowsiness and unconsciousness
4- respiratory depression and apnea phase
treatment by: 1- given the patient diazepam (5-10 mg) specially if the patient in the seizure state
2- u need to have o2 mask
If we have any medical problem u must start with ABCS and call to emergency
Adrenaline toxicity
1. adrenaline toxicity
it has asympathomaic effect coz it effect on different receptors α,β receptors
toxicity of adrenaline cause :
1- anxiety
2- restlessness
3- tremor
4- thropping headache
5- palpitation :
lidocaine can use in treatment of ventricular arthmia
6- sweating
7- dizziness
8- respiratory distress
if u have adrenaline overdose u must :
1- stop the treatment
2- reduce the bld pressure by setting the patient upright position
3- o2 administration
cardiovascular problems
-patients with hypertension should not give them L.A u prefer to give them plain anesthesia
- patients with unstable angina ,MI, these patients prefer to not make dental work to them but if u go to dental work use plain anesthesia
- patients with hyperthyroid u shouldn’t give them L.A with vasoconstrictor coz it cause crysis and malignant hypertension crebrovascular accident
** u must ask ur patient about all of these points to safe life
Systematic effects
-when adrenaline is contraindication in the L.A u can use felypressin instead of adrenaline but it not highly safety
-felypressin at high concentration it cause coronary constriction so u need to limit the amount of felypressin containing solution to lower than 3 carpoles
Adverse effects of other constituent of L.A :
-pay attention of allergic rxn that result from presvative specially methild parapell ?
** some L.A contain sulfide but now the new types don’t have it
The problem in sulfide that it is allergen specially in asthmatic patients it causes asthmatic attack so u must take a good medical history of ur patients
Done By:
بسم الله الرحمن الرحيم
Local Anesthesia
Dr.suksyna
Lec # 7
2-11-2011
This lec is about local anesthesia contraindication and complication
No drug is without unwanted effect and most of therapeutics agent can’t be used with complete safety in all individuals coz there is a variations in the metabolism between individuals
So what are the contraindication for local anesthesia:-
1- Patient not cooperative
The basic in the local anesthesia is that the patient is cooperative ,if the patient is not cooperative we can’t go for local anesthesia.
What are the different types of patients management (we take them later on but usually we start with local anesthesia)
If local anesthesia was not successful we go for additional sedation.
Sedation : is a technique for controlling patient if L.A is not successful
If sedation is not successful we go for general anesthesia (we must know what are the indication and contraindication for general anesthesia)
- In last of this semester we will take 2 lect about sedation & general anesthesia but Usually we start our procedure with L.A
To enable treatment to be completed under L.A , collaboration is required but when the patient is not cooperative :-
a) Patient with mental or physical impairment
These patients can’t be treatment under L.A
Eg: patient with cerebrovascular accident .
These patients mange under general anesthesia after we sure that their status are suitable for general anesthesia then we go for proper management.
b) Very young children
-coz they can’t differ between painful and non painful condition
-uncooperative child cant mange him \her under L.A so go for general anesthesia
c) unreasonable patient
- this is in a few people
L.A واحد بحكيلك مستحيل أقدر انك تشتغلي تحت
If L.A impossible ->you can go for general anesthesia bus this mean we need more medication also hospital admitted & it’s more expensive
Q: when the sedition is not effective ?
Answer :if the patient is still not cooptation with sedation and Sometime the operation itself need general anesthesia not sedation so in such situations sedation is not effective
Sedation is used for minor procedure pluses / minuses
We use medazolam in the sedation which causes calm to the patient ,but If the patient has any respiratory problem ,sedation is contraindication
So sedation is contraindication when :-
1- The patient is still not cooperative
2- The operation itself need general anesthesia
3- The patient has respiratory problem
2) treatment factors
a) time consideration
Some time we have prolonged therapeutic sections , so we should go for general anesthesia not for local
b) Access problem
For example ,when we make a surgery for post. part of tongue or in the soft palate ,in these sites we can’t achieve well L.A so we go for general anesthesia.
c) Acute infection
- it reduced efficacy of L.A
-if u have a patient with acute infection and extended to the facial spaces specially if the patient has medical problem such as diabetic patient , L.A for this patient is danger on his/her life so u have to warn ur patient
sad story : one of dentists has prescribed antibiotics for diabetic patient and this mistake caused facial infection to the patient then she suffered from sepsis then shock ,stroke and finally the patient was died
- Patients with acute infection L.A not effective for them ,these patients need to be admitted to the hospital and treated under general anesthesia to make incision and drainage (we have to drainage the abscess)
Q: how the patient be not cooperative under sedation ??
Answer :v. possible that the patient is not cooperative under sedation coz sedation is like valum pill the patient is fully conscious under it
sedation just makes the patient calm and this calming depends on the patients pain threshold
d) Allergy
-not common
-some patients have allergy from L.A , for these patients L.A is absolutely contraindication u must go for general anesthesia
We have amide and ester type of L.A ,some patients have allergy from amide type others have allergy from ester type so we can’t go for that type of L.A which the patient has allergy from it
e) Medical condition
-L.A for patients that have medical problems is relatively contraindication
f) Poor bld supply
If ur patients have poor bld supply in any area ,u can’t go for L.A u have to go for general anesthesia
-the use of L.A containing vasoconstrictor should be avoided in the area where bld supply has been compromised
if u use L.A for these patients, u will not use a high concentration of vasoconstrictor (adrenalin) coz it will worsen the situation
For example , after radiotherapy in the treatment of malignancy , u should not use or reduce the L.A coz L.A cause ostionecrosis ( which is type of ostomilitis) and that cause sequestering in the jaw
g) Contraindication to specific technique
Some techniques of L.A have special contraindications:
Ø Bld diathesis
-Patients who has bleeding problem or bld problem such as patients with hemophilia , L.A for these patients is contraindication specially block anesthesia coz it cause bleeding
and it is contraindication to give these patients injection anesthesia in the floor of the mouth coz it easy to cause hematoma formation and it may expand to the air way space and compression it
**so patients with bleeding problem
1)Id block is contraindication
2)Infiltration in the floor of the mouth is contraindication
What the solution for these patients ??
Either give them infiltration injection (but not in the floor of the mouth) OR interligemantal injection(which part of supplemental injection techniques )
Ø Susceptibility to endocarditis
Patients with susceptibility to endocarditis we not give them interligemantal injection coz in the interligemantal injection we use force during giving solution and this force the pathogen and microbes to go to the bld stream then to the heart
Ø In complete root formation
Interligamental injection could be given to pediatric patients but the problem in the children is that they have incomplete root formation and we said before that interligamental injection is given under force so the tooth may go out from the socket which called tooth avulsion (this is a minimal case but it happen)
Ø Trismus
Some methods of anesthesia like Akinosi cause trismus
Trismus as u knew :is a limiting mouth opening
Ø Epilepsy / cardiac pacemaker
Patients with epilepsy or cardiac pacemaker or cerebrovascular diseases ,electronic anesthesia* for these patients should be avoided coz these patients have abnormality in the conduction and when we use electronic devise ,it will interfere with this electrical conduction
Electronic dental anesthesia*: is advanced technique which we use a special electrode that help u to achieve anesthesia ( we don’t have it in our university hospital coz it v.expensive (don’t worry about it coz usually we use conventional type of anesthesia )
H) in pregnancy
L.A in pregnancy is contraindication in the first trimester specially in the 2-8wks of pregnancy
Any dental work is contraindication in the first trimester ,so any dental work should be in the middle or 2nd trimester
Lidocaine is the safest L.A to be used
prilocaine the most diffusion
bupivacaine the least diffusion
Lignocaine?? & mepivacaine are intermediate
The best choice of local anesthesia in pregnancy is lidocaine .
Local complications
1- Local discomfort
Which is acceptable caz this is nature
U are increase the pressure of the fluid in the small area
2- interepithelial injection
it cause pain and may cause epithelium ballooning & to overcome this u should insertion the needle to submucosa
3- Sub –periosteal injection
such as palatal injection is painful coz u inject in non compliant tissue
4- Too rapid injection
u must give slow injection not rapid ideally the injection takes 30 sec in order to less the discomfort to the patient
5- Direct content with the nerve trunk
This happen with experience dentist
The patient feel electrical shock
6- Factor related to the solution
Temp and pH
pH of the local anesthesia is low and this may cause burning sensation to the patient specially if the L.A contain adrenaline
post injection pain
some patients are highly sensitive to injection specially palatal injection (which cause sloughing to the epithelium) and forceful injection .they cause desquamation and ulcer formation but this is variable between individuals
1- Sub-preiosteal injection
Result in disconnection of periostum from the bone and this is cause pain
2- Force of interligamental injection
This produce extrude of tooth and may cause desquamation to the epithelium and ulcer
- If failure of anesthesia happens that mean u have to do multiple insertion of needle and this cause pain in the injection area( the severity of the pain depends on how the patient receive this pain)
Neurological problems
1- Prolong altered sensation
-unfinishing sensation in the area of injection and this due to trauma to the nerve trunk via needle OR injection solution in the nerve trunk itself
2- Hemi-facial palsy
-to avoid this u must do eyes protection
-this is a temporary case (deleted when the anesthesia is washed out)
When u give Id block the anesthesia go to facial nerve then to the tail of parotid and this cause hemi-facial palsy
3- Visual disturbances
We have a reported cases
Patient has a blurred vision or diplopia or any of vision problems
-unilateral or bilateral
-temporary and could be permanent
we have 2 explanations of the permanent visual disturbances :
1)Anesthesia go to the origin of the artery then transmission to the ophthalmic artery to middle meningal artery to id bundle and this cause blurred vision
2) Anesthesia go to pterygoid plexus which is valveless then transmission by venous system
4- Aural disturbances:
Cause by interarterial injection of L.A which reach the internal auditory artery then reach to ophthalmic artery which causes temporary loss of function of optic nerve
5- Extensive paralysis
L.A reach to the external carotid artery then to the internal carotid artery and finally it reaches the brain and causes a temporary paralysis
**these complications mainly happen with Id block anesthesia
When we take the anatomy of arteries and nerves we studied them in 80% of people and this means that 15% of people different from what we were studied so u don’t guess what will happen
-to reduce these complications and go to the safe side u have to do aspiration before given anesthesia
Most complication of L.A
1) vasovagal attack :first mark of it patients color become paler
2) syncope
vascular problems
1- intravascular injection
2- hematoma formation
-it’s painful and we afraid from infection so u must give antibiotic if it happens
-it can cause by self infected trauma : when we give Id block and when u pull the needle out u inject the lips and cause trauma to them
3- trismus
4- infection : u must have a tray that ur instruments are put on it coz the surface is not clean ( may contaminated) and when u put the needle on it and then to the patient mouth for id block it causes infection to the patient
some theories say that the L.A may interfere with healing but the doctor doesn’t believe them
equipment failure
1- broken needle
if the needle break u shouldn’t play with it
2- cartridge failure
carpole itself is splatter or broken
it happen mainly with beginner and with pdl (interligamental injection) coz it is given with force and this may cause break to carpole
**so slow rate of injection is recommended
L.A systematic adverse effect
Toxicity
U need to know the does /weight u deal with and it different between indivisibly(adult ,child ,old)
Take in ur consideration if the patient has medically problem
Cardiovascular toxicity
1- excitation phase
start with elevation in the bld pressure and tachycardia
2- depression phase
negative ionotropic on the heart that affect cardiac output and stroke volume and this cause hypotension
3- Cardiovascular collapse
It happens to support theCardiovascular function
Treatment by: - fluid
- cpr
- o2
U have to lower the amount of anesthesia in the patient with Cardiovascular problem for example lidocaine we give 10 carpoles that contain it for adult healthy patients but for patients with cardiovascular problem maximum we give 4 carpoles to them
pediatric -> we give them 2 carpoles
Most local anesthesia they case depressant action of the heart
L.A may cause methameoglobinaemia (this is the main toxic effect of procaine which causes cyanosis)
Methameoglobinaemia is a hemoglobin which contains iron in the ferric rather than in the ferrous state let reduces the red bld cells oxygen carrying capacity
This cause : - cyanosis
- lethargy
- respiratory distress
How to deal with this condition??
By give the patient methalen blue
Methameoglobinaemia happen due to one of prilocaine metabolized….cause oxidation to ferrous ion (this is a Q in any universal exam)
May this condition happens with articaine and bupivacaine
The best treatment is prevention by :
1) aspiration before inject anesthesia
2) slow injection
3) dose limitation
CNS toxicity
Marks :
1- excitation phase
restlessness , preoral numbness if the patient feel them u should stop the procedure
2- convulsive phase
seizure
3- depression phase
with drowsiness and unconsciousness
4- respiratory depression and apnea phase
treatment by: 1- given the patient diazepam (5-10 mg) specially if the patient in the seizure state
2- u need to have o2 mask
If we have any medical problem u must start with ABCS and call to emergency
Adrenaline toxicity
1. adrenaline toxicity
it has asympathomaic effect coz it effect on different receptors α,β receptors
toxicity of adrenaline cause :
1- anxiety
2- restlessness
3- tremor
4- thropping headache
5- palpitation :
lidocaine can use in treatment of ventricular arthmia
6- sweating
7- dizziness
8- respiratory distress
if u have adrenaline overdose u must :
1- stop the treatment
2- reduce the bld pressure by setting the patient upright position
3- o2 administration
cardiovascular problems
-patients with hypertension should not give them L.A u prefer to give them plain anesthesia
- patients with unstable angina ,MI, these patients prefer to not make dental work to them but if u go to dental work use plain anesthesia
- patients with hyperthyroid u shouldn’t give them L.A with vasoconstrictor coz it cause crysis and malignant hypertension crebrovascular accident
** u must ask ur patient about all of these points to safe life
Systematic effects
-when adrenaline is contraindication in the L.A u can use felypressin instead of adrenaline but it not highly safety
-felypressin at high concentration it cause coronary constriction so u need to limit the amount of felypressin containing solution to lower than 3 carpoles
Adverse effects of other constituent of L.A :
-pay attention of allergic rxn that result from presvative specially methild parapell ?
** some L.A contain sulfide but now the new types don’t have it
The problem in sulfide that it is allergen specially in asthmatic patients it causes asthmatic attack so u must take a good medical history of ur patients
Best Wishes
Done By:
Bara’ah Al-khateeb
Haneen Thnebat- عدد المساهمات : 152
النشاط : 6
تاريخ التسجيل : 2009-09-09
JU.De :: 4th year :: Local Anesthesia
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