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59 Cards in this Set

  • Front
  • Back
Pharmacodynamics
The mechanisms of drug action in living tissue
Therapeutic effect
A positive change in a faulty system
-+/- Rate at which cells or tissues function
- Modify strength of the function itself of the cell or tissue that is the drug’s target
Agonist
Enhances the drug effect
- Fits like a key. The better the fit, the more effect
Antagonist
Attaches to the receptor, but does not elicit response
Agonist-antagonist
Drugs that attach, elicit some response and also block other responses
Enzyme interactions
Inhibit or enhance the action of a specific enzymes (ACE inhibites/antigiotensin converting enzyme
Nonspecific interactions
Targets cell membranes & cell processes (antibiotic & chemo agents
Acute therapy
Sustain life and treat disease
Maintenance Therapy
Chronic illness
Supplemental/replacement therapy
Insulin
Palliative therapy
Pain, meds, oxygen
Supportive Therapy
Maintains integrity of bodily function
Prophylactic therapy
Prevent illness or undesirable outcome
Empiric Therapy
Based on experience
Monitoring
Be familiar with the drugs:
- Intended therapeutic action (beneficial)
- Unintended but potential adverse effects
Therapeutic index
Ratio of drugs toxic to therapeutic level
Drug concentration
Measures of toxic levels
Tolerance and dependence -
Decreasing response to repeated drug doses
Physiological or psychological need for a drug
Interactions:
Drug, food, other substances
Additive effects
1+1 = 2; response is equal to combined responses of individual drugs
Synergist effects
1+1= 3 response is greater than
Potentiation
0+1 = 1 drug with no effect enhances effect of second drug
Antagonist effect
1+1 = 2 or 0; drug inhibits effects – one drug cancels out the effect of the other
Incompatibility
IV or IM – two drugs result in undesirable response
I.e. anaphylactic, cardiac response
Enzyme
Catalyzes a reaction
Adverse drug reaction
Any reaction to a drug that is unexpected and undesirable and occurs as therapeutic dosages
Monitor
Pain scale
Vital signs
Lab results
- Checked after dose has been allowed to take effect
Adverse Drug Reaction
Any reaction to a drug that is unexpected and undesirable and occurs at therapeutic dosages
Idiosyncratic reaction
Occurs unexpectedly in a particular patient
Teratogenic
Result in structural effects to the developing fetus
Mutagenic
Permanent changes in the genetic composition of living organisms
Why are children most vulnerable
- Smaller
- Undeveloped immune system
Why are elderly more vulnerable -
Physiological changes resulting in the decline f body functions
Pregnancy -
drugs cross the placenta by diffusion]- fetus at
- greatest risk during the first trimester
- Last trimester – greater amount of drug crosses the placenta due to placenta development
- maternal factors esp. liver and kidneys
Pregnancy Safety based Catagories Fetal- Risk Studies
A – No risk to fetus
B – No risk to animals, human info unavailable
C- Adverse effects in animals, human info unavailable
D – Possible fetal risk in humans - must consider benefit vs risk
X – Fetal abnormalites
Pediatric considerations
Pharmacokinetics considering in pediatric patients
- higher water content
- immaturity of organs
- more susepetable to toxicity,
BSA Body surface area
Pediatrics dosage calculations
(BMI in adult)
Geriatric Considerations
-decline in organ function or depression of metabolizing enzymes
-older adults proportionally the more prescription and OTC meds
-Polypharmacy – use of many different drugs concurrently
-Common drugs – Beta blockers, digitalis, diuretics, insulin, and K+ supplements
-Common OTC drugs – analgesics, laxatives, NSAIDS (Non-steroidal)
Physiological Changes -
Cardiovascular – decreased absorption and distribution
- GI – altered absorption, delayed excretion
- Hepatic – decreased metabolism
- Renal – decreased excretion
-ALSO : decreased body water, decreased lean body mass, increased fat content
Opiods & the Elderly Patient -Confusion
- decreased respitory rate,
- falls
Anticoagulants & the Elderly Patient
- increased Bleeding
- Drug and dietary interactions
Antihypertensives & the Elderly Patient
- Heart Failure
- decreased BP & HR
teach pts – monitor HR/BP, cautious of falls/machinery
Cardiac glycosides & the Elderly Patient
Treats Dysrhythmis
Side effects - Visual disturbances, nausea
Teach pts. – monitor HR/ BP
CNS depressants & the Elderly Patient -
sedation
-weakness
-confusion
- urinary retention
Sedatives, hypnotics & the Elderly Patient
- Confusion
- Daytime sedation
- forgetfulness (beyond normal congnitive decline)
- falls
Thiazide diuretics & the Elderly Patient
- Fluid & electrolyte imbalance
- fatigue
- dehydration
Medication reconciliation
What meds is pt on, and which should be eliminated, which should be added. To avoid overdose of Prescriptive and OTC similar drugs
Elderly patients & Bladder flow obstruction
Avoid Anticholinergics and antihistimines
Elderly patients & Clotting disorders
Avoid NSAIDs, ASA, antiplate-let drugs
Elderly patients & CODP
Avoid – sedatives/hypnotics, narcotics, beta blockers
- decreased repiratory drive
Elderly patients & Heart failure, hypertension
Sodium, decongestants, OTC cold remedies, amphetamines
-contain vasoconstrictors & epinephrines – raises BP
Elderly patients & Syncope,
falls Sedatives, hynotics, narcotics, CNS depressants
Cultural Considerations
Environmental, cultural and genetics
Cultural influences
-complience
- alternative therapies,: herbal, homeopathic, acupuncture, cupping, home remedies, cold/hot…
-diet: amount of fat, malnutrition
- genetic factors: slow/rapid acetylation; G6PD (particular enzyme)
- health benefits : balance, bad luck, bad deed, religious beliefs & practices
ASA
Aspirin
NSAIDs
Non-steroidal Anti-inflammatory Drugs
Culture
An integrated systems of beliefs values and customs, that are handed down from generations
Cultural competence
The ability to work with patients with considerations with a cultural context regarding a patients heath
Drug polymorhpism
Effect of a patients age, gender, size, body composition on pharmacokinetics.