Med classes Bones- Quiz 1 Flashcards
Osteoporosis vs. Osteomalacia vs. Paget’s Disease
Osteoporosis: progressive loss of bone mass and skeletal fragility
(Loss of architecture)
-Most common postmenopausal women, older men and as a medication side effect like glucocorticoids, anti-seizure & blood thinners. Diseases: hyperthyroidism
Osteomalacia: Soft bone, architecture intact but strength impaired. Most common cause Vit D deficiency. RIKETS in kids.
Paget’s Disease: Disorganized bone formation. Usually limited to one or a few bones (skull & upper extremities common).
Type 1 Osteoporosis
-Bone resorption exceeds formation, formation is NORMAL
-Post Menopausal women (most common)
Type II Osteoporosis
Mechanism
Population
Associated factors
Treatment
-Bone FORMATION is SLOWED
-Older men & women starting at 80
-WHo gets: Hyperthyroid, CKD, Steroids Antiseizure meds, blood thinners, PPI
-Treated the same as primary.
Drugs that cause bone loss?
-Aluminum Antacids
-Anticonvulsants (less formation)
-Antipsychotics (less formation)
-Aromatase Inhibitors
-Lasix (high dose)
-Glucocorticoids (>30 days of 20mg or more will cause osteoporosis for everyone)
-Heparin (decreased growth)
-Provera (increased resorption)
-SSRI (decreased growth)
-Actos (decreased growth)
-Levothyroxine (excess doses)
Primary Osteoporosis therapies
-Ca & Vit D
-Weight bearing exercise
-No smoking or ETOH
-Avoid drugs that increase bone loss
What test do you need to order if your patient has to be on bone decreasing medications?
DEXA scan
Baseline & Yearly while still taking the medication
What does a DEXA scan do?
Compares bone thickness to a 35 yo adult of the same gender, with similar height and weight for adults.
Kids compared to same age control
How is a DEXA scan scored? At what score do you treat?
Adults T score
Kids Z score
Score -2.5 (=2.5 standard deviations away from normal which defines osteoporosis)
What is another assessment for fracture risk?
Who is a good candidate for this tool?
FRAX
Older adult, especially one who’s been identified as having osteopenia
All medications to treat osteoporosis are anti-resorptive except one, which one? How does it work?
Teriparatide (Forteo)- stimulates osteoblasts to create more bone… Is synthetic parathyroid hormone
What is the biggest problem with the use of anti-resorptive meds?
Make the bone VERY hard causing them to be brittle and fracture.
Should only be used for <3 years!
Problematic if the patient needs tooth extractions, dental implants, or bone grafts.
Bisphosphonates
MOA & Indication
-Anti-resorptive (slows bone breakdown) slows the osteoclast resorption of bone IF the patient has normal bone growth (less than 80 and not taking any drugs) they will get a net gain in bone.
-Rapidly cleared from plasma bound to hydroxyapalite in bone. Cleared over months to years renally.
-Prevention or treatment of osteoporosis of hip and spine
Suffix -dronate
Bisphosphonates
Labs/Diagnostics
Creatinine (needs CrCl >30mL/min)
Blood calcium
DEXA baseline
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Bisphosphonates
Follow up labs/diagnostics
CrCl
Ca
Vit D
DEXA Q 1-2yrs
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Bisphosphonates
Blackbox warnings & Contraindications
Black box:
Atypical femur fracture, Osteonecrosis of jaw (high doses over long periods)
DRUG HOLIDAY around 3 yrs-5 yrs depending on the route of administration
-CrCl <30mL/min
-Hypocalcemia
-Esophageal disorders (if oral)
-Patients who can’t sit or stand for at least 30-60 minutes
-Low Vit D
-Caution with pregnancy
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Bisphosphonates
Adverse drug effects & Common side effects
ADE: Diarrhea abdominal and musculoskeletal pain, atypical femur fracture, osteonecrosis of the jaw
Common: Diarrhea, abdominal pain, musculoskeletal pain
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Bisphosphonates
Specific education, counseling & follow up
-Oral version
–Take with a full glass of WATER only for 30 minutes.
-Sit or stand for at least 30-60 minutes after taking in AM BEFORE breakfast and at least 2 hrs before vitamins. Absorption can be significantly effected with food or other meds.
-Increased risk of ADE with dental extractions/implants, ETOH, smoking, glucocorticoid use and diabetes
-Should have regular dental check ups (esp if at risk for osteonecrosis of jaw)
Follow Up:
-Initiation 4-6 wks after
-Maintenance: 6-12 months
Bisphosphonates
Drug-drug & drug-food interactions
Decreased absorption of bisphosphonates with:
-PPI
-Ca/Mg/Fe/Al
Risk of ADE:
-NSAIDS
-Aminoglycosides
-Corticosteroids
-Any nephrotoxic medication
Should be taken on empty stomach with water only. NPO or water only for at least 30 min. 2hrs better for food, vitamins or other meds to prevent decreased absorption.
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Bisphosphonates
Lifespan considerations
Children: rarely used, corticosteroids
Adults: endocrine disorders, corticosteroids, cancer
Older Adults: Target demographic
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Alendronate (Fosamax or Binosto)
Bisphosphonate PROTOTYPE DRUG
-PO
-Daily or weekly
-Worst GI profile
-Binosto- effervescent tablet
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Risedronate (Actonel or Atelvia)
Bisphosphonate
-PO
-Weekly or monthly
Ibandronate (Boniva)
Class
Population
Bisphosphonate
-PO or IVP
-Monthly or quarterly
-Only approved for spinal osteoporosis
Way to remember
I band ronate
I band the spine
Zoledronic acid (Reclast or Zometa)
Bisphosphonate
-IV infusion only
-Yearly
Selective Estrogen Receptor Modulator (SERM)
MOA & Indication
Group suffix
MOA: estrogen like effects on bone and estrogen antagonistic effects on breast and endometrium, also lowers LDL cholesterol
Indication: Post menopausal, can’t take bisphosphonates, <75 with uterus
Suffix -ifene