Overall Review Flashcards
Intranasal (localized or systemic)
localized drug action CNS effect (preparation dependent)
inhalation
can be systemic or localized
facilitated diffusion and Active transport
hydrophilic, large, ionized
factors affecting absorption
- molecular characteristics (charge, size, lipophilicity vs hydrophilicity)
- administration route
Absorption and Distribution
lipophilic, small, and non-ionized
Excretion
hydrophilic, ionized
First Pass
PO –> hepatic vein –> systemic body
Examples of first pass metabolism
morphine, meperidine, diazepam, midazolam, lidocaine, propranolol, ETOH
Factors affecting distribution
- PPB
- size of tissue
- blood flow to the tissue
- molecular characteristics
Albumin
acidic drug
Alpha 1 acid glycoprotein
basic drug
Highly bounded PPB Examples
Warfarin, NSAID, ibuprofen, naproxen, furosemide, digitoxin
Blood brain barrier
selective transport
P-glycoprotein pump
volume of distribution (Vd)
drug dose/ measured drug plasma concentration
inactive drug to active metabolite
prodrug
ig. codeine
active drug to active metabolite
toxic
Phases of metabolism
phase I: hydrolysis, reduction, oxidation (Cytochrome P450 group)
polar metabolite: ionized, saturable
Phase II: conjugation, polarization
Inhibitors of CYP 450 1A2
Ciprofloxacin (inhibit metabolism)
-decrease metabolism -> manage diarrhea symptoms
Inducers of CYP 450 1A2
Barbituates
Cruciferous vegetables
Tobacco
(increased metabolism)
example of phase ii metabolism (induce metabolism)
acetaminophen (tylenol) is phase I metabolized to N-acetyl-p-benzoquinoneimine (which is hepatotoxic), and then phase II is metabolized by glutathione enzyme conjugation to an inactive metabolite.
p.s. overdose can lead to depletion of glutathione –> TOXIC
what are the excretory organs?
kidney (primary), saliva, bile, lungs.
3 factors affecting renal excretion
- molecular characteristics (PPB, Urinary pH, metabolized)
- renal function (young vs old)
- cardiac output (renal blood flow)
first order kinetics
readily metabolized in the liver
zero order kinetics
metabolism is saturable
e.g. ETOH, aspirin, phenytoin
1-2 drinks = 20-30 mg/dL
clearance rate = 20mg/dL/hr
ETOH poisoning: > 295mg/dL
creatinine
checks your kidney function by looking at the amount of creatinine in your urine and blood.
half-life
time at which drug has lost half its Cmax concentration
examples of narrow TI meds
warfarin
dignoxin
phenytoin
tacrolimus
partial agonist
lower efficacy
eg. buprenorphine (less effect than opioid)
inverse agonist
bind to the agonist site but produce the opposite effect
eg. caffine (inhibit the effect of adenosine, which prompts GABA release to inhibit wakefulness)
antagonist
blocks the receptor site but NO efficacy
e.g. naloxone (for opioid misuse)
Common overdose drugs examples
acetylsalicylic acid (aspirin) acetaminophen (tylenol) fentanyl cocaine benzodiazepines alcohol antidepressants
overdose procedure
airway breathing circulation (perfusion) disability (dysfunction) exposure
toxidromes
toxic syndromes and signs
acetylsalicylic acid
function: decrease platelet aggregation (一直失血)
confusion tachycardia tachypnea hyperthermia diaphoresis 發汗 vomiting
acetaminophen
abdominal pain loss of appetite nausea/vomiting diaphoresis somnolence 嗜睡
opioids
bradypnea/apnea bradycardia somnolence/coma pupils constricted itching (allergic response relating to inflammation)
cocaine (stimulant)
agitation, tremors tachycardia tachypnea hyperthermia diaphoresis pupil dilated
tx: sedatives
adsorption
activated charcoal
binding of drug to decrease its absorption
e.g. tylenol poisoning, asa, benzodiazepines
ways to increase elimination
- activated charcoal (GI)
- urinary alkalization (renal) e.g. acidic aspirin poisoning give sodium bicarbonate
- hemodialysis (renal)
Parietal cells and gastric chief cells synthesize and secrete
HCL acid / Pepsinogen –> pepsin (active)
How do endogenous organs be protected from gastric juice
foveolar cells have mucous and bicarbonate, bile and pancreatic bicarbonate
What’s the pH of GI? and pH after HCO3?
1.5-3.5, to 7
HCI positive feedback
Enteroendorine (G) cells –> gastrin
gastrin stimulates parietal cells
parietal cells produce HCI
HCI is released by proton pump into stomach
proton pump is mediated by enzyme H+K+-ATPase
G cells release histamine
histamine binds to H2 receptors on parietal cells
parietal cells increase HCI production
GERD pathophysiology (2)
- weak lower esophageal sphincter
- delayed gastric emptying
–> mucosal injury
GERD treatment (3)
- decrease acidity
- avoid irritants
- fundoplication (tight pylorus)
PUD pathophysiology
failure of endogenous protection (cell junctions and mucous/bicarbonate layer)
–> mucosal erosion
Treatment for H pylori
amoxicillin
Where does H pylori present in?
present in both 90% duodenal and 75% gastric ulcers
ranitidine
cimetidine
famotidine
H2 receptor antagonists
antibiotics to treat PUD
amoxicillin
clarithromycin
metronidazole
pepto bismol 3 utilization
antiinfective
antiacid
antidiarrheal
large intestine synthesizes what vitamins
vitamin b and k
noninflammatory vs inflammatory acute diarrhea
< 2 weeks
inflammatory is caused by pathogenic invasion of intestinal cells, infectious, have fever and bloody diarrhea (dysentery). dehydration
e.g. C. difficile
noninflammatory is disruption of normal absorption, will feel nausea or vomit. dehydration
first and second line c. difficile treatment
1st: flagyl (DNA)
2nd: vancomycin(cell wall)
what does atropine mean
stimulate sympathetic system and block parasympathetic system –> inhibit GI function
Three types of diarrhea
- osmotic diarrhea
- secretory diarrhea
- inflammatory diarrhea
IBS
neurologic bowel disorder (diarrhea)
CNS dysregulation of normal motility
triggered by stress, anxiety, etc.
What is Hirschsprung disease
ganglion cells in large intestine wall dont develop before birth. –> constipation
Five types of laxatives
- bulk forming
- softeners
- saline and osmotic
- stimulants
- miscellaneous
cathartics
evacuation of the bowel for procedure
where is the vomiting centre
medulla and outside of BBB
H1 antagonism (antihistamine)
reduce vestibular excitation (motion sickness)
dimenhydrinate: diphenhydramine + chlorotheophyline
meclizine (dramamine)
diclectin (pregnancy): doxylamine + pyridoxine hydrochloride (vitamin b6)
antimuscarinic anticholinergics and meds
reduce vestibular excitation (motion sickness)
scopolamine - transdermal patch
5HT3 antagonist and meds
purpose: visceral pain
ondansetron
D2 receptor antagonism
purpose: GI pain
phenothiazines
metoclopramide
prochlorperazine
s/e: sedation
CB1 & 2 agonism
purpose: chemotherapy
cannabinoids: THC and cannabidiol
stimulate GABA to inhibit sympathetic activity
Cannabinoids meds
Dronabinol
Cesamet
Nabilone
Cannibas
whats the percentage of body fluid
60%
percentage of intracellular fluid
40%
percentage of extracellular fluid
20%
What to do when GI bleeding
stop contributing meds like antiplatelet, anticoagulants, thrombolytics, NSAIDs
give fluids and blood transfusion
give proton pump inhibitor
Expected osmolality
275 to 295 mOsm/kgH20
Osmolality is dependent on
number of dissolved solutes
dehydration= higher = more solutes over-hydration = lesser = less solutes
Tonicity focuses on
sodium and dextrose amount in IV fluid
albumin 5% fluid tonicity
isotonic in the bag and hypertonic in the body
D5 1/2 NS fluid tonicity
hypertonic in the bag and isotonic in the body (dextrose is quickly utilized
how much fluid is needed for maintenance?
35ml/kg/day of water (grown adult)
4/2/1 rule
how much glucose is needed to limit starvation ketosis
50-100g/day
NPO meaning
nothing by mouth
colloids
aka. plasma expanders
supply protein into ECF and stays in circulation
e.g. plasbumin, alburex
treatment for hypovolemic shock
colloids
NS 0.9% contents and side effects
154 mEq Na
154 mEq CI
isotonic
hypokalemia and no dextrose (lack energy)
what is #1 choice for resuscitation fluid?
NS 0.9% adults 500mL
Lactated Ringer content
more electrolytes
potassium 4mEq
Calcium 2.7 mEq
lactate 28mEq
LR is not suitable for which population? why?
children; too high electrolytes, high lactate
D5NS and D5LR tonicity
hypertonic
Dextran 40 tonicity
isotonic, but hypertonic in the body
D10W tonicity
hypertonic
D5 0.45% NS
hypertonic; osmolality = 405 mOsm/L
25% albumin tonicity and treatment
hypertonic; resuscitation to replace deficits (IV volume expander)
3% NaCl tonicity and treatment
hypertonic; head injury to lower ICP
what is the first choice for maintenance fluid for pediatrics
D5 0.45% NS (requires electrolytes and dextrose)
0.45% NS tonicity
hypotonic
D5W tonicity
hypotonic in body but isotonic in bag
3.3% dextrose, 0.3% sodium
hypotonic
D5 0.2% NS
hypotonic
Electrolytes balance is important for?
nerve conduction and water balance
common causes and treatment of
Hyponatremia
Hypernatremia
<135 mEq/L; diuretics; D5NS
145 mEq/L; kidney failure; diuretics
common causes and treatment of
Hypokalemia
Hyperkalemia
< 3.5 mEq/L; diuretics; KCL IV/PO
>5 mEq/L; K+ sparing diuretics; Kayexalate
tx of diabetic ketoacidosis
hypotonic fluid
tx of hypernatremia
hypotonic fluid
tx of cerebral edema
hypertonic fluid
tx of severe hyponatremia
hypertonic fluid
tx for dehydration patients d/t vomiting and diarrhea
isotonic LR
preeclampsia
gestational HTN
causes of gestational HTN
inflammatory cytokine release due to endothelial changes
risk of gestational HTN
DIC, thrombocytopenia
decreased elasticity of vessels = _____ peripheral vascular resistance
increased
orthostatic hypotension
drop of SBP <20mmHg or DBP >10mmHg
120/80 normal –> 100/70
venous pooling, transient
treatment of orthostatic hypotension
adrenergic agonists
Mean arterial pressure
70-100mmHg
CO=
CO=SV x HR
CPP=
MAP - ICP
map: usually the same
ICP: increase
whats the treatment of HTN (ER)
nitric oxide (direct acting vasodilator)
Meds for nitric oxide; s/e
nipride and hydralazine
syncope (fainting), hypotension due to reflex tachycardia
4 types of treatment for HTN
diuretics
renin angiotensin drugs (ACE inhibitors and angiotensin II receptor blockers) (vasodilate and decrease blood volulme)
calcium channel blockers (decrease CO)
adrengeric agents (decrease CO and vasoconstriction)
whats is 1st line HTN treatment
diuretics
4 types of diuretics
- Loop diuretics (furosemide) ascending loop of henle
- Thiazides distal convoluted tubule
- Potassium sparing (spironolactone) collecting duct –> increases na out and keep k+ in
- Osmotic (mannitol, isosorbide) proximal tubule and loop of henle–> pull solvent into circulation and into renal tubules & inhibit renin release
Aldactazide is a combination of ___ and ___ and excellent ______ therapy for HTN
thiazide and k+ sparing combination; maintenance
side effects of diuretics and loop specifically
hyperglycemia; ototoxicity
in vasoconstriction, liver produces _____ in _____ and kidney produces ______ in response to low BP.
angiotensionogen in plasma
how does angiotensinogen converts to angiotensin I
by renin
what does adrenal cortex produce?
aldosterone (increase sodium reabsorption)
what lead to the production of aldosterone?
angiotensin II in plasma
decrease ventricular
decrease BP
decrease preload
decrease blood volume
angiotensin II binds to receptors
blood vessels and heart, adrenal cortex, kidneys
1st line drug in heart failure
angiotensin converting enzyme inhibitors –> vasodilate
meds: thiazide diuretic + angiotensin receptor blocker
Hyazaar HCT; Cosart-H
treatment of angina and arrhythmias
calcium channel blockers
two types of calcium channel blockers
- vascular selective (smooth)
2. cardio selective (cardiac)
treatment of arrhythmia and atrial fibrillation
cardio selective calcium channel blockers and beta blockers
Verapamil and diltiazem
cardiac muscle
Nifedipine and amlodipine
smooth muscle
adverse effects of calcium channel blockers
reflex tachycardia, peripheral edema, dysrhythmias, heart failure, hypotension
ginseng
calcium channel antagonist
= ca2+ influx blocked
alpha 1 receptors function
cause vasoconstriction
alpha 2 receptors function
cause vasoconstriction
beta 1 receptors function
increase cardiac activity (HR)
beta 2 receptors function
bronchodilation and vasodilation
increased breakdown of glycogen to supply energy
specificity:
atenolol
propranolol
metoprolol
beta 1 vosodilation
beta 1 and beta 2 antiarrhythmic (
what is the adrenergic antagonist meds for antiarrhythmic
propranolol
specificity:
Prazosin
Phentolamine
(alpha 1) – peripheral vasodilation
(alpha) – peripheral vasodilation
lopressor HCT
diuretic (thiazide) and adrenergic antagonist
how does CNS alpha 2 adrenergic agonists work? what does it inhibit?
decreased in sympathetic tone by decreasing presynaptic ca levels –> inhibiting release of norepinephrine
whats the treatment for resistant HTN
CNS alpha 2 adrenergic agonist
what lead to endothelial cell damage (clotting)
- mechanical stress
- immune response
- oxidative stress
Site of injury (high cholesterol level) produce ____
VCAM-1
VCAM-1 causes the migration of ____ beneath endothelium
circulating monocytes
how is free radical released and what does it impact?
monocytes differentiate into macrophages and produce oxidative stress; LDL
oxidized LDL become _____ after phagocytized by ______.
form cell; macrophage
what organ and enzyme produces cholesterol?
liver; HMG-CoA
drugs lowering lipids (inhibit cholesterol)
- statins (decrease LDL)
- niacin (increase HDL) –> increase clearance
- fibrates (decreases VLDL) –> increase lipolysis and metabolism
what is the first line treatment for post MI (myocardial infarction)
statin
what lowering lipids med is ideal for low HDL
niacins