drug therapy considerations across the lifespan
TRANSCRIPT
Drug Therapy Considerations
Across the Lifespan
Drug Therapy for Pediatric Clients
3
Pediatric Drug Therapy• Approximately 75% of
all prescription drugs in the U.S. lack full approval by the FDA because most drugs are not studied on children.
• Studying the effects of drugs in children is a problem.
4
Classification of Pediatric Clients
• < 1 month Neonate
• 1 month to < 2 years Infant
• 2 years to < 12 years Child
• 12 years to < 18 years Adolescent
5
Absorption• Gastric acid (hydrochloric acid)
secretion in infants- less acidity • Decreased first pass effect• Increased topical drug
absorption• IM injection sites• Intravenous drug
administration - produce the least variable
response because the medication given completely bypass the absorption step
6
Distribution• Dependent upon the
amount of water and/or fat present in the child, as well as plasma affinity of the drug and protein-binding activity• Water-soluble drugs more
effectively utilizedthan fat soluble-Protein binding capacity is
less (until age one year)
7
Distribution
• Drugs that binds to CHON are generally bound to a lesser degree in pediatrics client than in adult…
due to: 1) low CHON concentration in
pediatric patient 2) decrease affinity of their
proteins for drug molecules
8
Metabolism
• Difficult to predict • Immature liver
function
9
Excretion• Depends on Glomerular
filtration, tubular secretion, tubular reabsorption
• Immature Kidney function• Glomerular filtration does not
reach adult levels until two years of age
• Excretion increases as the kidney matures• Drug toxicity decreases as the
kidney matures
10
Pediatric Drug Sensitivity
• Central nervous system drugs- not fully mature until 8 months and blood-brain barrier more permeable during this time• Barbiturates and morphine
• Depressant effects are exaggerated
• Lowering body temperature• Acetaminophen
• Becomes toxic easily with large doses
• Salicylates • Do not give to children under the
age of 12.
11
Pediatric Dosages
• Based on body weight• Body Surface Area• Determined by using a
nomogram• Nomograms are
generally accurate after the attainment of mature liver and kidney function.
• Pg 406 – Pickar Text
12
West Nomogram
13
Pediatric Dosage Calculation
• Clarks rule * Child Dose = [Wt of child (lbs) x
adult dose] ÷ Adult dose
• Young’s rule (1 yr to 12 yrs.) * Child Dose = [(Age in years) x (adult
dose)] ÷ (Age + 12)
• Fried’s Rule (up to 1-2 yrs.) * Child Dose = (Age in months x adult
dose) ÷ 150
Math exercise time 14
Accurate way to Determine BSA
•Metric BSA •m2 = ht (cm) X wt (kg)
divided by 3,600• Then take the square root
• Household BSA• m2 = ht (in) X wt (lb)• divided by 3,131• Then take square root
15
Calculating Safe DosagesBased on Weight
• First step – convert pounds to kilograms
• Find recommended safe dose range – Drug Handbook Resource
• Calculate safe dose range mg/kg• Compare with ordered dose• Clarify with physician if dose is
below minimum or above maximum range
16
Calculating Maintenance Fluids
• Formula:• 100 ml/kg/day for first 10
kg of body weight• 50 ml/kg/day for next 10 kg
of body weight• 20 ml/kg/day for each kg
above 20 kg of body weight
17
Rights to Follow
• Allow adequate time for drug administration
• Gain the child’s trust• Never lie to the child
• Consider the child’s developmental level
• Prevent choking
18
Administration Methods
• Liquid medications are administered using an infant dropper, syringe without a needle, or a small spoon
• Schedule medication when the infant is hungry
19
Parenteral Medications• Explain the procedure to the
child and to the parents.• Use additional materials such
as:• Booklets• Coloring books• Puppets• Dolls• IV setup with colored water
20
Painful Procedures• Allow the parents to stay.• Painful procedures should
be done in a separate room designated as the “owie” room.
• Use a firm positive manner.• Assemble equipment first.• Maintain the child’s safety.
21
Intramuscular Injections
• Vastus lateralis is the preferred site for children under the age of 3.
• Ventrogluteal site is the preferred site for children over the age of 3.• The child should be walking.* Those who are receiving injections
in the dorsogluteal site must be instructed to lie on their stomach with the toes pointing inward to relax the buttocks muscle
22
Anterior view of the location of the vastus lateralis muscle in a young child.
(continued)
23
Considerations for IV administration
• Site selected must not limit child activities
• Gauge??• Methods for IV
administration - direct IV push (or 5
minutes or less) - soluset method - syringe pump
24
Poisoning in Children
• Syrup of ipecac???• Vomiting must not be induced if
the child is comatose, poison is corrosive, or if it is a petroleum base
• Activated charcoal or magnesium sulfate given by health care professionals have proven to be safe and more effective in preventing gastric absorption of poison
25
Final Step in Administering Drugs to Children
• Evaluate drug action• Remember • Children are vulnerable.• Be kind and patient.• Enjoy the children; you
will receive more than you give.
• Children generally have short attention span (1 to 5 minutes/ depends on year of development)
Drug Therapy for Geriatric Clients
Chapter 6
Drug Consumption
• Age ≥ 65 = increasing population growth• Elderly are estimated to consume
approximately 1/3 of all prescription drugs
• Estimate elderly use 3/4 of over-the-counter drugs
• Polypharmacy• Complicated by sensory impairment,
social isolation, inadequate nutrition, and poverty
Absorption
• Diminishes with increased age
• GI concerns• Reduced stomach acid (HCl)• GI absorptive surface area is
reduced • Prolonged gastric emptying rate• Use of laxatives and bran
reduce absorption• Blood flow to the intestines is
reduced• Reduced muscle tone in the
stomach and intestines
Distribution
• Water loss• Muscle loss• Fatty tissue increase• Protein binding:
decreased capacity
Metabolism
• General decline as age increases
• Causes are obscure; possibly due to:• Reduced blood flow to the
liver
Excretion
• Measure creatinine function • Blood flow to the kidneys
reduced• Renal function is reduced• Loss of intact nephrons
* The elderly are more likely to experience drug toxicity, because of accumulation of drugs
Drug Receptors
• Internal drug receptors may change• Results in diminished or
greater responses• Close monitoring is
required
Other Factors
• Memory loss• Sensory loss• Multiple health problems• Multiple medications at
multiple times• Use of multiple
pharmacies
Other Factors• Economic factors• Lack of education• Communication
problems• Cultural considerations• Diet therapy
Points to Remember
• Because of memory loss…the elderly may understand instructions given, but then forget the instructions shortly after unless ‘written down’
• Elderlies are prone to the risk of self-medication…due to sharing.
• Client response to therapy must be evaluated such as excessive sedation and orthostatic hypotension
Assessing the Elderly
• History of drug allergies• Current prescriptions• Current non-prescriptions• Herbal supplements• Home Environment• Social support• Financial concerns• Physical limitations
Implementation
• Oral medications• Position for administration:
high Fowler’s• Speak clearly and slowly.• Offer the most important
medication first.• Have plenty of liquid
available.• Do not rush the elderly client.
Intramuscular Medications
• Use ventrogluteal site.• Avoid deltoid muscle.• Avoid vastus lateralis
because of loss of muscle mass.
IV Medications
• Flow rate must be carefully monitored to prevent circulatory overload
• Signs/ symptoms of fluid overload
Storage
• Safe storage of medications• Keep out of the reach of
grandchildren and other young children.
Evaluation
• Evaluate• Communication: Does client
understand?• Can they understand regimen,
dosage, adverse effects, s/s to report, importance of compliance
• Can they demonstrate safe administration
• Do they experience any idiosyncratic responses
Teachings• Use visual aids• Avoid use of blue and
green, or yellow and white, as elderly often have difficulty distinguishing these colors
• Alcohol abuse is often left unrecognized
Promoting Health• Prevent infections.• Improve nutrition.• Encourage exercise and
activity.• Facilitate social
interaction.• Promote restful sleep.