smoking cessation Flashcards
(38 cards)
smoking and nicotine
-Other toxins in tobacco smoke, not nicotine, are responsible for majority of adverse health effects
-> 4000 different chemicals
-tar, carbon monoxide, irritant and oxidant gases
-> 40 carcinogens
-The main adverse effect of nicotine from tobacco is addiction, which sustains tobacco use
-Nicotine dependence leads to continued exposure to toxins in tobacco smoke
smoking statistics
-Tobacco
-#1 cause of disease and premature death
-Leading preventable cause of mortality
-480K deaths/year
-11.5% of adult Americans smoke (28.3M)
-13.1% Men, 10.1% Women
-~2K young people <18yo start each day
-Cost - $100 billion/yr
-68% - have desire to quit
-55% - try to quit annually
-7.5% - who try to quit succeed
smoking and cardiovascular disease
-Smoking increase risk of CVD
-Smoking cessation significantly decrease risk within 1–3 years
-Smoking-related factors contributing to CV risk include:
-increased thrombogenesis
-carbon monoxide
-oxidative damage
-hyperlipidemia
properties of nicotine
-Has stimulant and depressant effects
-Rapidly absorbed from mouth and respiratory tract into blood stream.
-Can bind to and stimulate nicotinic receptors in autonomic ganglia, CVS, respiratory system and nervous system
pharmacological actions of nicotine: Cardiovascular system
-positive inotropic, positive chronotropic
-increase cardiac output
-increase SBP & DBP
pharmacological actions of nicotine: respiratory system
-Low dose - increase respiration via activation of chemoreceptors in aortic arch and carotid bodies
-High dose - increase respiration by direct stimulation of respiratory center
-Toxic doses – respiration depressed by inhibiting the respiratory centers in brainstem and complex action at receptors of neuromuscular junction
pharmacological actions of nicotine: CNS
-Mild euphoria, increase arousal and concentration, improved memory, appetite suppression
-Tremors, convulsions, respiratory stimulation
-Nausea and vomiting (tolerance dvps quickly)
pharmacokinetics of nicotine
-Well absorbed from mucous membranes
-Widely distributed, crosses BBB and placenta
-Inhibits monoamine oxidase – may have dopamine like effects
-Nicotine metabolism is induced by the tars in cigarette smoke (via CYP450) – leads to pharmacokinetic tolerance
-Nicotine also can induce metabolism of beta-blockers, BDZ, opiods and theophylline
-pregnant- mom smokes -> baby smokes (kicking, tachycardia)
smoking cessation
-Aversion Therapy
-Patient associates smoking with something undesirable
-Not very effective
-Often used w/ hypnosis or acupuncture
-Substitution Therapy - NRT
-Abrupt Withdrawal – “cold turkey” May be combined w/ agents to reduce craving
tobacco cessation guidelines
-Department of Health & Human Services
-3 types of patients:
-Those willing to quit
-Those unwilling to quit
-Past users who recently quit
pts willing to quit
-5 steps to intervening and motivations
-5As
-ASK- systematically identify all users at every visit
-ADVISE- strongly urge all users to quit
-ASSESS- determine if pt is willing to quit or not
-ASSIST- help pt set up a plan to quit
-ARRANGE- schedule follow up contacts to reinforce quitting and identify problem with current plan, best to do during 1st week, 1st month, then PRN
pts NOT willing to quit
-5 steps to intervening and motivating
-5Rs
-RELEVANCE- help pt determine specific areas in life that would benefit from quitting
-RISKS- help pt identify neg consequences of smoking
-REWAREDS- help pt identify benefits to quitting
-ROADBLOCKS- help pt identify barriers to quitting
-REPETITION- encourage pt to quit at every visit
pts who recently quit
-Reinforce their decision
-Review the benefits of quitting
-Help with problems that may be encountered by quitting
nicotine replacement therapy
-Nicotine replacement therapy (NRT) can be used instead of tobacco to aid quitting
-NRT delivers nicotine without the toxins from tobacco
-NRT helps combat the symptoms of withdrawal
-Nicotine dose from NRT is lower and administered more gradually than with smoking and this reduces the addictive potential
plasma nicotine concentrations for smoking and NRT
-nasal is fastest but irritates
smoking and cardiovascular disease
-NRT can be used safely by majority of people with cardiovascular disease, even with concomitant smoking
-Meta-analysis shows no difference in rate of acute MI between NRT patch and placebo
-The benefits of NRT outweigh the risks, even in smokers with cardiovascular disease
nicotine replacement therapy
-All considered First line agents
-Nicotine gum
-Nicotine inhaler
-Nicotine nasal spray
-Nicotine patch
-Nicotine lozenge
nicotine gum
-nicorette
-Dosing
-If < 24 cigarettes/day – 2 mg gum up to 24 pieces per day
-If > 24 cigarettes/day – 4 mg gum up to 24 pieces per day
-Duration- 12 weeks
-ADRs – dyspepsia, mouth soreness
-Instructions – Chew slowly to avoid jaw ache and increase buccal absorption
-chew 1-2 times and hold in cheek for most efficacy
nicotine inhaler
-nicotrol
-Dosing: 6 – 16 cartridges/day
-Duration: 6 months
-ADRs: Local irritation of mouth and throat
-Instructions: Best effect with frequent continuous puffing (20 minutes)
-oral fixation
nicotine nasal spray
-nicotrol NS
-Dosing: Each dose (2 sprays=1mg nicotine) 1-2 sprays/hr; max is 5 doses (10 sprays) per hour and 40 doses/day
-Duration; 3-6 months
-ADRs: nasal irritation
nicotine patch
-Nicoderm CQ, Habitrol, Nicotrol, ProStep
-Dosing: Most common regimen
-21mg/24 hr x 4 weeks
-14mg/24 hr x 2 weeks
-7mg/24 hr x 2 weeks
-(Nicotrol comes in 15mg,10mg & 5mg/24 hr)
-ADRs – local skin reaction, insomnia
nicotine lozenge
-commit
-Dosing:
-If 1st cigarette smoked 30 min after waking up, use 2mg lozenge
-If 1st cigarette smoked within 30 min of waking up, use 4 mg lozenge
-Use 1 lozenge q1-2 hrs x 6wks then
-Use 1 lozenge q2-4 hrs x 3 wks then
-Use 1 lozenge q4-8 hrs x 3 wks
-ADRs – sore throat
safety of NRT
-Risk of cancer from NRT is negligible compared to the risk from continued smoking
-Nicotine per se is not a known cause of cancer
-Other tobacco smoke constituents are believed to be responsible for cancers
-Studies carried out in rodents demonstrate that under normal conditions nicotine is not carcinogenic
NRT and pregnancy
-Maternal smoking is associated with poor pregnancy and childhood outcomes
-Many toxins in tobacco smoke could be responsible
-Nicotine is a potential fetal teratogen
-Nicotine may contribute to obstetrical complications in pregnant women and to sudden infant death syndrome
-Benefits of NRT outweigh the risks of smoking during pregnancy