Premedication Flashcards
What do we use for mild conscious sedation? (3)
- antihistaminics
- benzodiazepines
- nitrous oxide
What do we use for deep conscious sedation?
Benzodiazepines (intranasally)
What type of analgesia does conscious sedation have?
mild
What type of analgesia does unconscious sedation have?
deep
What type of consciousness does conscious sedation have? (2)
- light/moderate depression of conciousness
- responds to verbal commands
What type of consciousness does unconscious sedation have? (2)
- deep depression of consciousness
- responds to painful stimulus
What type of consciousness does general anesthesia have?(2)
- Loss of consciousness
- No response to stimuli
Ventilation in conscious sedation?
Spontaneous ventilation
Ventilation in unconscious sedation?
Airway may be compromised
Ventilation in general anesthesia ?
air permeability compromised
Cardiac function in conscious sedation?
Correct cardiac function
Cardiac function in unconscious sedation?
Non-cardiovascular
Cardiac function in general anesthesia?
Cardiovascular alteration may exist
Which drug used for conscious sedation must be in the consultation of the pediatric dentist?
Benzodiazepines
What are the general recommendations for conscious sedation? (3)
- never increase dose in the same appointment
- administer outside postprandial (after eating) period (absorption/vomiting)
- remain at home under supervision for 3-4 hours after
What medication is needed for mild conscious sedation? (3)
Premedication:
- antihistaminics
- Benzodiazepines (o.v)
Inhaled sedation:
- nitrous oxide
What medication is used for deep conscious sedation?
Premedication: benzodiazepines (intranasal)
Indications for conscious sedation? (4)
- anxiety disorders
- very small children (1-3y/o)
- psychic or maturity delay when general anesthesia is contraindicated/can be avoided
- hyperactive/unstable children
Conscious sedation disease contraindications? (6)
- respiratory dysfunction / anomalous airway (hypertrophic tonsils)
- intracranial hypertension. Depression of conciousness
- cardiac dysfunction
- neuromuscular disease
- intestinal obstruction
Conscious sedation other contraindications? (6)
- drug allergies
- older children with severe behavioural problems
- children under 1 years old
drug contraindications for Mild conscious sedation?
- hypotensives
- anticoagulants
- CNS depressants
What antihistaminics do we use for conscious sedation? (3)
- Hydrxyzine (atarax)
- deschlorpheniramine (polaramine)
- alimemacin (variargil)
What benzodiazepines do we use for conscious sedation? (2)
- Diazepam (valium)
- midazolam (dormicum)
Antihistaminics for conscious sedation are derived from… (2)
- phenothiazines: piperazine, alkylacine
Antihistaminics for conscious sedation mechanism of action
inhibit histamine receptors involved in allergy
Antihistaminics for conscious sedation mechanism maximum effect?
1-2 hours
Antihistaminics for conscious sedation mechanism duration?
3-6 hours
Antihistamine effects? (5)
- antiallergic
- antipruritic
- antispasmodics (muscle relaxant)
- antiemetic
- anxiolytics (secondary effect : drowsiness)
very high doses of antihistamines can produce…? (4)
- CNS depression
- convulsions
- arrhythmias
- hypotension
contraindications for antihistaminics conscious sedation? (6)
- under age of 2
- allergy to phenothiazines
- liver/kidney disease
- hypersensitivity to its components
- porphyria
Antihistaminics for conscious sedation should never be associated with…
CNS depressors
Dosage of hydroxycine? (3)
2mg/kg. 2 intakes. 1 the night before and one 1h before treatment
*if only doing one intake you can increase the dose by 50%
Hydroxycine maximum effect?
1-2 h
Hydroxycine average duration?
3-6 hours
Dexchlorpheniramine (polaramine) dosage? (2)
- under 6: 0.5mg/8 hours
- over 6: 2mg/8 hours
Alimemacina (variargil) dosage? (3)
- under 2: maximum 2 drops
- 2-6: 2-4 drops
- 6-12: up to 8 drops
Dexchlorpheniramine & alimemacina maximum effect>
1-2 hours
Dexchlorpheniramine & alimemacina average duration?
3-6 hours
Mild sedation with benzodiazepines acts on…
CNS - enhances action of GABA (neurotransmitter inhibitors)
Mild sedation with benzodiazepines actions: (5)
- Anxiolytic
- sedative
- amnesiac
- anticonvulsant
- muscle relaxant
Mild sedation with benzodiazepines indications? (4)
- psychoneurotic disorder with agitation and tension
- alcohol withdrawl (tremor and agitation)
- adjuvant treatment of musculo-skeletal pain
- sedative premedication
Mild sedation with benzodiazepines secondary effects?
High dose seizures:
- tolerance
- dependece (Deprivation has to be slow
- do not use more than 2-4 weeks
- hypotension & breathing depression (CNS depression)
Mild sedation with benzodiazepines contraindications? (5)
- respiratory dysfunction (anomalous airway, sleep apnea)
- cardiac dysfunction
- intracranial hypertension
- intestinal onstruction
- neuromuscular disease
Types of benzodiazepines? (2)
- diazepam
- midazolam
Diazepam average life?
40-100 h
Which drug is a great hypnotic with muscle relaxing and anticonvulsant effects?
diazepam
Diazepam start of action?
45 mins
Diazepam maximum peak?
1-2 hours
Diazepam lasts…?
6-8 hours and there may be active metabolites at 20-70 hours
Diazepam antagonist?
Flumazenil (anexate) used in hospital environment
Diazepam dosage for mild sedation? (2)
- 1-0.5 mg/kg orally one hour before appointment
* given AT the clinic
Diazepam dosage for children?
weight * 2 = number of drops
What advantages does midazolam have over diazepam? (4)
- starts at 20 mins (greater amnesic effect and shorter letency time)
- twice as powerful
- shortest halflife (1-4 hrs)
Dosage of midazolam for mild sedation?
- 0.5mg/kg single dose 20-30 mins before treatment
Deep sedation midazolam indications?
Patients with little to no cooperation (rare in dentistry)
How do we administer benzodiazepines for deep sedation? which one?
MIDAZOLAM intranasaly
Action of midazolam intranasal?
fast: 10-15 mins
Dosage of midazolam instranasal?
0.2-0.5mg/kg
Nitrous oxide mild sedation induction time?
2-3 mins
Nitrous oxide mild sedation recovery time?
3 mins
Nitrous oxide mild sedation therapeutic index?
narrow
Nitrous oxide mild sedation absorption and elimination?
pulmonary
Nitrous oxide effects? (2)
analgesic and sedative
Nitrous oxide mild sedation advantages? (4)
- FAST and gentle
- staggered administration
- short recovery time
- no injection
Nitrous oxide mild sedation disadvantages? (4)
- small therapeutic index
- cost of equipment
- monitoring oxygen concentrations (should not be less than 30%)
- nausea and vomiting
Nitrous oxide mild sedation indications? (5)
- children with anxiety
- semi-cooperative children
- phobia of local anesthesia
- increased vomiting reflex
- physically handicapped
Nitrous oxide contraindications?
- breathing problems: sinusitis
- non-response capacity: mentally handicapped, very young children
Nitrous oxide technique: (4)
- start with 85%02 and 15% N2o for 2-3 mins
- increase 5% at intervals
- mixture >65% o2 and = 35% n2o
- when done, administer 100% O2 for 5 mins
20% concentration of nitrous oxide produces.. (2)
Paresthesias
pleasant sensation
40% concentration of nitrous oxide produces.. (2)
Good pain tolerance
patient collaboration
40-70% concentration of nitrous oxide produces.. (5)
- high psychosedation
- loss of verbal contact
- uncontrolled movements
- amnesia
- spasms