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59 Cards in this Set
- Front
- Back
Pharmacodynamics
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The mechanisms of drug action in living tissue
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Therapeutic effect
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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 |
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Agonist
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Enhances the drug effect
- Fits like a key. The better the fit, the more effect |
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Antagonist
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Attaches to the receptor, but does not elicit response
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Agonist-antagonist
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Drugs that attach, elicit some response and also block other responses
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Enzyme interactions
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Inhibit or enhance the action of a specific enzymes (ACE inhibites/antigiotensin converting enzyme
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Nonspecific interactions
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Targets cell membranes & cell processes (antibiotic & chemo agents
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Acute therapy
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Sustain life and treat disease
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Maintenance Therapy
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Chronic illness
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Supplemental/replacement therapy
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Insulin
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Palliative therapy
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Pain, meds, oxygen
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Supportive Therapy
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Maintains integrity of bodily function
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Prophylactic therapy
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Prevent illness or undesirable outcome
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Empiric Therapy
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Based on experience
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Monitoring
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Be familiar with the drugs:
- Intended therapeutic action (beneficial) - Unintended but potential adverse effects |
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Therapeutic index
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Ratio of drugs toxic to therapeutic level
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Drug concentration
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Measures of toxic levels
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Tolerance and dependence -
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Decreasing response to repeated drug doses
Physiological or psychological need for a drug |
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Interactions:
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Drug, food, other substances
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Additive effects
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1+1 = 2; response is equal to combined responses of individual drugs
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Synergist effects
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1+1= 3 response is greater than
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Potentiation
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0+1 = 1 drug with no effect enhances effect of second drug
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Antagonist effect
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1+1 = 2 or 0; drug inhibits effects – one drug cancels out the effect of the other
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Incompatibility
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IV or IM – two drugs result in undesirable response
I.e. anaphylactic, cardiac response |
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Enzyme
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Catalyzes a reaction
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Adverse drug reaction
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Any reaction to a drug that is unexpected and undesirable and occurs as therapeutic dosages
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Monitor
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Pain scale
Vital signs Lab results - Checked after dose has been allowed to take effect |
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Adverse Drug Reaction
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Any reaction to a drug that is unexpected and undesirable and occurs at therapeutic dosages
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Idiosyncratic reaction
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Occurs unexpectedly in a particular patient
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Teratogenic
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Result in structural effects to the developing fetus
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Mutagenic
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Permanent changes in the genetic composition of living organisms
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Why are children most vulnerable
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- Smaller
- Undeveloped immune system |
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Why are elderly more vulnerable -
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Physiological changes resulting in the decline f body functions
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Pregnancy -
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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 |
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Pregnancy Safety based Catagories Fetal- Risk Studies
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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 |
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Pediatric considerations
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Pharmacokinetics considering in pediatric patients
- higher water content - immaturity of organs - more susepetable to toxicity, |
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BSA Body surface area
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Pediatrics dosage calculations
(BMI in adult) |
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Geriatric Considerations
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-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) |
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Physiological Changes -
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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 |
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Opiods & the Elderly Patient -Confusion
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- decreased respitory rate,
- falls |
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Anticoagulants & the Elderly Patient
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- increased Bleeding
- Drug and dietary interactions |
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Antihypertensives & the Elderly Patient
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- Heart Failure
- decreased BP & HR teach pts – monitor HR/BP, cautious of falls/machinery |
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Cardiac glycosides & the Elderly Patient
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Treats Dysrhythmis
Side effects - Visual disturbances, nausea Teach pts. – monitor HR/ BP |
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CNS depressants & the Elderly Patient -
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sedation
-weakness -confusion - urinary retention |
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Sedatives, hypnotics & the Elderly Patient
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- Confusion
- Daytime sedation - forgetfulness (beyond normal congnitive decline) - falls |
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Thiazide diuretics & the Elderly Patient
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- Fluid & electrolyte imbalance
- fatigue - dehydration |
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Medication reconciliation
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What meds is pt on, and which should be eliminated, which should be added. To avoid overdose of Prescriptive and OTC similar drugs
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Elderly patients & Bladder flow obstruction
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Avoid Anticholinergics and antihistimines
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Elderly patients & Clotting disorders
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Avoid NSAIDs, ASA, antiplate-let drugs
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Elderly patients & CODP
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Avoid – sedatives/hypnotics, narcotics, beta blockers
- decreased repiratory drive |
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Elderly patients & Heart failure, hypertension
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Sodium, decongestants, OTC cold remedies, amphetamines
-contain vasoconstrictors & epinephrines – raises BP |
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Elderly patients & Syncope,
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falls Sedatives, hynotics, narcotics, CNS depressants
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Cultural Considerations
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Environmental, cultural and genetics
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Cultural influences
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-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 |
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ASA
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Aspirin
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NSAIDs
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Non-steroidal Anti-inflammatory Drugs
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Culture
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An integrated systems of beliefs values and customs, that are handed down from generations
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Cultural competence
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The ability to work with patients with considerations with a cultural context regarding a patients heath
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Drug polymorhpism
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Effect of a patients age, gender, size, body composition on pharmacokinetics.
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