Pharm Flashcards
Skeletal muscle contraction is evoked by what receptor?
Nicotinic cholinergic (M receptor)
NON depolarizing neuromuscular blockers act as?
ACh antagonists
ex: Tubocrarine
Depolarizing neuromuscular blockers act as?
ACh agonists
Ex: Succinylcholine
Nondepolarizing neuromuscular blockers w. Renal elimination?
Pancuronium + tubocurarine
Non depol blocker w/ Hepatic metabolism and Hofman elimination to from Laudanosine?
Atracurium
AE of Laudanosine?
Seizures
Stereoisomer of atracurium and inactivated to form LESS laudanosine and one of the MC used muscle relaxants?
Cisatracurium
MOA of nondepol neuromuscular blockers?
Competitively prevent ACh action at skeletal muscle end plate
Phase of blockade by depolarizing blocker during which the end plate repolarizes but is less than normally responsive to agonists (ACh or succinylcholine)?
Desensitization
Caused by massive release of Calcium form SR leading to uncontrolled contractions and stimulation of metabolism of skeletal muscle?
Malignant hyperthermia
Made up of 2 ACh molecules linked end to end?
Succinylcholine
Where is Succinylcholine metabolized?
Liver and Plasma by Pseudocholinesterases
What is the affect of continuous depolarization of motor end plate?
Muscle relaxation and Paralysis
What is required for tension to be maintained is skeletal muscle?
Periodic REpolarization and Depolarization
What is the difference btwn Phase I and Phase II affects of Succinylcholine actions?
Phase I–> continuous depolarization
Phase II–> gradual repolarization
How does AChesteral Inhibitor affect the paralysis produced by Succinylcholine?
Phase I–> AChesterase I increases Succin action
Phase II–> AChE inhib Reverses Succ action
AE of Succinylcholine?
Respiratory paralysis–> asphyxiation
Stimulates Autonomic ganglia–> Histamine released
Myalagia–> Hyperkalemia
Malignant hyperthermia–> co-admin w. inhaled anesthetic
What is a very early sign of Life threatening malignant hyperthermia caused by Succinylcholine action?
Jaw muscle contractions (trismus)
ACh Esterase inhibitors include?
Pyridostigmine
Neostigmine
Physostigmine
Sugammedex –> steroidal agent only
MOA of Curare?
competitive ACh antagonist
Neuromuscular blockers that also affect Autonomic ganglia?
Tubocurarine–> weak blocker
Succinylcholine–> Stimulator
Neuromuscular blockers that affect Cardiac Muscarinic receptors?
Pancuronium–> Moderate BLOCKER
Succinylcholine–> Stimulator
Neuromuscular blockers w. ability to Release Histamine?
Atracurium–> slight
Tubocurarine–> Moderate
Succinylcholine–> Slight
Localized disorder of bone remodeling caused by increased osteoblastic and osteoclastic activity?
Pagets disease (osteotitis deformans)
Disease associated w. increased Hat size + hearing loss due to narrowing of auditory foremen?
Pagets disease
What are the typical levels of Alkaline phosphatase, calcium, PTH, and phosphates in Pagets disease?
ALP–> Elevated >10x normal
Phosphates–> W/ in normal range
Calcium–> Normal levels
PTH–> Normal levels
Bones with mosaic pattern of growth, increased “chalk stick fractures” + Increased risk of HF & osteogenic sarcoma?
Pagets
What are the defining characteristics of the 3 stages of Pagets disease?
stage 1–> Osteolytic w, increased resorption
stage 2–> Disorganized bone formation
stage 3–> sclerotic or burnt out phase
What is the primary abnormality in Pagets disease?
Over production and activity of Osteoclasts
Alkaline phosphatase is a marker for?
Bone formation
Hydroxyproline is a marker for?
Bone Resorption
Patient w. hypercalcemia + hypercalciuria + renal Stones + hypophosphatemia?
Primary HyperParathyroidism
osteititis fibrosa cystica
Causes increased PTH + Increased ALP + Increased cAMP in urine + weakness and Constipation?
Primary Hyperparathyroidism (OFC)
Cystic bone spaces filled with brown fibrous bone tissue causing bone pain, Stones + bones + groans?
Osteititis Fibrosa cystica
Bone lesions due to 2nd or tertiary hyperparathyroidism due to Renal failure?
Renal osteodystrophy
Pt w. bone disease caused by
Hypovitaminosis D–> hypcalcemia + hyperphosphatemia + increased ALP + PTH?
Renal Osteodystrophy
Brown bone tumors of hyperparathyroidism?
Osteititis Fibrosa cystica
Decreased bone disease?
Osteoporosis
Thickened and dense bone disease (weak)?
Osteopetrosis
Soft bone disease (not mineralizing properly)?
Osteomalacia + Rickets
Causes Abnormal bone architecture?
Pagets disease
Pt with muscle rigidity, tachycardia, increased CO2 production, and elevated core body temp?
Malignant hyperthermia–> Succinylcholine + sevoflurane
What is the treatment for Malignant hyperthermia?
DANTROLENE
Bone disorder caused by Parayxovirus infection of Osteoclasts?
Pagets disease
Radiographic lytic lesions with increased ALP?
Pagets disease
MOA of methotrexate when treating RA?
Block AICAR–> AICA accumulates–> Inh Adenosine Deaminase–> Increased Adenosine
What is the role of AICAR transformylase?
Catalyzes the last step of Inosine monophosphate biosynthesis (AICA–> FAICAR)
How does accumulating adenosine affect RA?
InhibitsLymphocyte proliferation suppresses Secretion of IL-1, IFN, TNF Increases IL-4 secretion Impairs Histamin release from basophils Decreases PMN chemotaxis
What drug undergoes polyglutamation to be retained Intracellularly?
Methotrexate
MXT metabolism and elimination?
RENAL Elimination-> (tubular secretion)
Hepatic metabolism-> CI w/ alcoholics + hepatic Failure
AE of MXT?
Immunosuppression-> CI w. HIV Pulmonary Fibrosis Interstitial Pneumonitis Teratogenic Less frequent: Malignant Lymphoma Fatal Derm rxn GI toxic (PUD + Ulcerative colitis-> w. NSAIDS)
Pro-drug, metabolized into sulfapyridine and melamine by Bacterial in colon?
Sulfasalazine
What metabolite of Sulfasalazine is acetylated and hydroxylated in the LIVER?
Sulfapyridine
What kind of patients experience Higher levels of Sulfapyridine?
POOR ACETYLATORS
MOA of Sulfasalazine?
Primarily Anti-inflammatory by MESALAMINE
MOA of Mesalamine?
Inhibits PG and LT production
Sulfasalazine Elimination + CI + AE?
Renal Elimination
CI w. Hypersensitivity to salicylates + Sulfa
AE: Fatal BLOOD dyscrasia
MOA of Leflunomide?
Prodrug–> A77 1726–> inhibits Dihydroorotate dehydrogenase
Suppresses B + T cells and Immunoglobulins
What is the active metabolite of Leflunomide?
A77 1726
What is the function of Dihydroorotate dehydrogenase?
Key step in Pyrimidine synthesis
MOA: inhibits Pyrimidine synthesis–> T + B cells arrested in cell cycle & collaboration interrupted?
Leflunomide
Cytostatic drug that also suppresses Immunoglobulin production?
Leflunomide
What RA drug metabolite also has a Uricosuric effect (increases Uric acid elimination)?
Leflunomide–> A77 1726
Leflunomide Elimin + AE?
Fecal elimination
Hepatic toxicity
Teratogenic
CI w, Immunosuppression or infections
MOA of Hydroxychloroquine?
Increases intracellular vacuole pH + alters protein degradation + and macromolecule assembly
Drug that diminishes formation of peptide-MHC protein complexes required to stimulate CD4+ T cells?
Hydroxychloroquine
Hydroxychloroquine Elimination + AE?
Slow renal elimination AE: OCULAR disease Hepatic toxicity Blood dyscrasia CNA toxic Ototoxic Seizures Neuropathy
AE: Ocular disease + Ototoxic + Seizures + hepatotoxic?
Hydroxychloroquine
What drug requires routine Opthalmic exams?
Hydroxychloroquine
RA drugs that are mAbs against TNF alpha?
Adalimunmab
Certolizumab
Infliximab
Golimumab
RA drugs that acts as Soluble receptor for TNF?
Etanercept
RA drugs acting as IL-1 receptor antagonists?
Anakinra
RA drug that acts as IL-6 receptor mAb?
Tocilizumab
What is the cell that is thought to be responsible for RA inflammatory process?
T helper 17 cells
What is the action of Th17 cells in RA?
Release IL-17–> induces IL-1 + IL-6 + TNF alpha release
What is the role of IL-23 + IL-6 + IL-1 in RA?
Induces T cell differentiation into Th17 cells
MOA; anti CTLA4–> binds CD80 & CD86 to prevent T-cell co-stimulatory signal engaging w, CD28?
Abatacept
MOA; binds TNF, blocks its interaction w. p55 and p75 cell surface receptors?
Adalimumab
MOA: competitively inhibits IL-1alpha + beta binding to IL-1R?
Anakinra
MOA: hmAB that neutralizes membrane associated and soluble human TNF alpha?
Certolizumab
MOA: hmAb that binds to and neutralizes both soluble & transmembrane TNF alpha?
Golimumab
MOA: chimeric (mouse) mAb that binds and neutralizes soluble & transmembrane TNFalpha?
Infliximab
MOA: anti-CD20 which mediates B cell lysis?
Rituximab
MOA: hmAb that binds to soluble (serum & synovial fluid) & membrane bound IL-6 receptors to Inhibit signaling?
Tocilizumab