MDS PREP
Rapid onset of action seen by local anaesthesia in small nerve endings is due to
1. Increased threshold of small nerves due to depolarization
2. Low pH of small nerve fibres
3. High ratio of surface area to the volume of small nerve fibres
4. None of the above
Oral Surgery
Answer: 3
Rapid onset of action seen by local anaesthesia in small nerve endings is due to the high ratio of surface area to the volume of small nerve fibres.
Open reduction and internal fixation of fracture fragments in the older patients is risky because
1) Of their old age, they less likely tolerate the major procedure under general anaesthesia
2) Fixation is difficult because bone will become more dense as age advances
3) Both of the above are correct
4) None of the above are correct
Oral Surgery
Answer: 4
The risk associated with open reduction and internal fixation (ORIF) in older patients is not solely due to their age or increased bone density. It's important to consider their overall health, including potential comorbidities and reduced healing capacity. The risks might be higher due to factors like poor bone quality, increased surgical time, and the potential for complications such as infection and nonunion.
According to gate control theory of pain, large fiber impulses tend to
1. Bypass the central control process
2. Inhibit the effect of painful stimuli transmitted by small fibers
3. Both the above
4. None of the above
Oral Surgery
Answer: 2
According to gate control theory of pain, large fiber impulses tend to inhibit the effect of painful stimuli transmitted by small fibers.
In the extraoral technique for mandibular nerve block the needle after contacting the pterygoid plate is directed
1. Anteriorly
2. Posteriorly
3. Superiorly
4. Inferiorly
Oral Surgery
Answer: 1
In the extraoral technique for mandibular nerve block, the needle is inserted
into the pterygomandibular space anterior to the lateral pterygoid plate and
directed anteriorly to avoid damaging the maxillary artery and other important
structures located posteriorly. The goal is to place the anesthetic solution
around the mandibular nerve before it enters the pterygopalatine fossa.
The blood product of choice for treatment of haemophilics is
1. Fresh blood
2. Cryoprecipitate
3. Fresh frozen plasma
4. Plasma
Oral Surgery
Answer: 2
Cryoprecipitate is the blood product of choice for treatment of haemophilics, as
it is rich in Factor VIII, which is deficient in this condition. It is used to
control bleeding during surgical procedures.
In gate control theory of pain, pain is mainly modulated by
1. Substantia gelatinosa
2. B fibers
3. C fibers
4. Transmission system
Oral Surgery
Answer: 1
In gate control theory of pain, pain is mainly modulated by the substantia gelatinosa.
Among the following items in the past medical history, which would most affect the choice of local anaesthetic agent?
1. RHD
2. Hyperthyroidism
3. Adrenal insufficiency
4. Asthma
Oral Surgery
Answer: 2
Adrenal insufficiency would most affect the choice of local anaesthetic agent.
Hypoglycaemia may occur in a patient taking insulin and undergoing extraction when
1. Extraction is done on empty stomach
2. Patient had an infection
3. Patient had no exercise in the morning
4. None of the above
Oral Surgery
Answer: 1
Hypoglycaemia may occur in a patient taking insulin and undergoing extraction
when the procedure is done on an empty stomach. This is because insulin lowers
blood sugar levels, and without food to balance the insulin's effect, the
patient could experience a dangerous drop in blood glucose. It is important to
ensure that the patient eats before the surgery and that glucose levels are
monitored.