Set 2 (Derm, MSK) Flashcards
Cutaneous mycoses
Dermatophytosis
Pityriasis versicolor
Subcutaneous mycosis
Sporotrichosis
Mycoses w/ systemic involvement
Histoplasmosis
Blastomycosis
Coccidioidoses
Opportunistic mycoses
Candida
Aspergillus
Mucor and Rhizopus
Hypo or Hyper-pigmented skin patches that become more visible after tanning
Pityriasis versicolor (Malassezia furfur)
Spaghetti and meatball appearance
Malassezia furfur
Pityriasis versicolor
Etanercept
Recombinant form of TNA-receptor (binds TNF-alpha)
Cyclosporine MOA
Inhibits NFAT from entering nucleus –> inhibit release of IL-2 (thus: less activation of resting T cells)
Calcipotriene
VitD analog
(binds vitD receptor –> activate nuclear TF –>inhibit keratinocyte proliferation, stimulate keratinocyte differentiation)
Ustekinumab
Human monoclonal antibody used in psorasis that targets IL-12 and IL-23
(inhibits differentiation and activation of CD4+ Th1 and Th17 cells)
Gas gangrene: think of this organism
Clostridium perfringens
Gram + rod, spore-forming, abundant in soil
C. perfringens: causes?
Gas gangrene
Late-onset food poisoning (toxin-mediated): transient watery diarrhea
Hypotonia, Jaundice, Macroglossia
Constipationm, Umbilical hernia, Poor feeding
Risk of mental retardation if untreated
Increased incidence of CHD
Congenital HYPOthyroidism
Newborns are screened for?
Congenital HYPOthyroidism
PKU
Galactosemia
Developmental delay, Mental retardation
Mousy body odor
Fair skin coloring
PKU
Essential for normal brain development and myelination during early life
T4
Examples of postural skeletal m. rich in Type I (slow twitch, red) muscle fiber
Soleus
Paraspinal
Thyroidectomy: risk of injuring what nerves?
Recurrent laryngeal n. (ligature of inferior thyroid artery)
External br. of superior laryngeal n. (ligature of superior thyroid artery)
Anterior dislocation of shoulder joint
Fracture of NECK of humerus
Axillary n. damage:
Paralysis of deltoid, teres minor
Sensory loss of upper lateral arm
Violent stretch between head and shoulder (trauma, delivery)
Erb-Duchenne palsy
musculocutaneous and suprascapular nerves damage –> waiter’s tip posturing of arm
Common cause of long thoracic n. injury
Mastectomy or surgery in axillary region
Winging of scapula, inability to abduct shoulder PAST 90 degree
Role of ATP in skeletal and cardiac muscle contraction
RELEASE myosin head from its actin binding site
Calcium release in skeletal muscle results in?
Ca2+ –> binds troponin –> shift tropomyosin away from myosin binding site ON ACTIN
Phosphorylation of myosin light chain
ACTIVATING myosin to bind acting filament in SMOOTH MUSCLE
NOT seen in skeletal muscle
This is associated with temporal arteritis
Polymyalgia rheumatica
Preceding damage to myocytes
w/ subsequent over-expression of MHC-1 proteins on sarcolemma –>
infiltration with CD8+ T lymphocytes and myocyte damage
Polymyositis
Tabes dorsalis
Tertiary syphilis manifestation:
Demyelination and atrophy of medial dorsal roots and posterior columns –> SENSORY ATAXIA
Reactive arthritis: Syphilis
NO!!!!!!!!!!!
Caused by: Chlamydia, Campylobacter, Salmonella, Shigella, Yersinia etc.
Recurrent otitis media suggests?
HUMORAL immunodeficiency
Pneumocystis infection
Chronic mucocutanous candidiasis
Indicate?
Underlying T-cell deficiency
Recurrent infections caused by EXTRAcellular, ENCAPsulated organisms
Agammaglobulinemia
Phagocytic defects
Chronic granulomatous disease (recurrent abscess)
Increased susceptibility to infection by Neisseria
Complement deficiencies of C5-C9
C1, C3, C4 deficiencies
Lupus-like syndrome
Recurrrent infections by bacteria/virus/fungi/opportunistic pathogens
Failure to thrive
Chronic diarrhea
1st year of life
SCID
Candida skin tests gauges?
Type 4 hypersensitivity reaction
GOOD TEST OF CELL-MEDIATED immunity
Cells of cell-mediated immunity
CD4, CD8 T cells
NK cells
Macrophages
Extracellular glycoprotein that is abundant in:
Zonular fibers of lens
Periosteum
Aortic media
Fibrilin
Nodules that spread along lymphatics (subcutaneous)
Thorn prick
Sporothrix schenckii
Dimorphic fungi, gardner
Mental retardation
Eczema
Mousy/musty body odor
PKU
Autosomal recessive
Decreased proximal tubular uric acid reabsorption
Probenecid
Gout
Inhibition of phospholipase A2 activity
Glucocorticoid
Excessive metalloproteinase acitivity and myofibroblast accumulation during wound healing
Contracture
Trendelenburg sign
Hip dips TOWARD UNaffected side.
SUPERIOR gluteal n. (supplies gluteus minimus and medius)
Inferior gluteal n. injury
Difficulty rising form seated position and climbing stairs
Gluteus maximus
Femoral nerve
Flexion of thigh (iliacus, sartorius)
Extension of leg (quadriceps femoris)
Sensory to anterior thigh, medial leg
Sciatic nerve
All knee flexors (hamstrings) EXCEPT biceps femoras SHORT head
Lysyl hydroxylase deficiency
EDS w/ kyphoscoliosis and ocular fragility
Collagen containing disulfide-rich globular domains
EDS w/ procollagen peptidase deficiency
(Resulting in MORE soluble collagen that does NOT x-link properly with other collagen molecules)
(Joint laxity, loose skin, easy bruisability)
Tibial n.
Flexors of lower leg
Extrinsic digital flexors of toes
Skin of SOLE of foot
Cutaenous branches of saphenous nerve
Skin of MEDIAL leg
branch of femoral nerve
Medial aspect of foot innervated by?
Superficial peroneal n.
Br. of common peroneal n.
Calcaneovalgocavus position: dorsiflexed and everted foot.
Injury to tibial n.
Chronic lymphedema: risk factor for?
Angiosarcoma
Stewart-Traves syndrome
Hemangiomas
Benign congenital vascular neoplasms
Affect INFANTS
Often enlarge in months following birth before spontaneously involuting
T-tubules
Invaginations of sarcolemma
@ A-I junction
Coordinated contraction of all myofibrils.
Poor contractile forth on repeated muscle stimulation
Myasthenia gravis
Impaired relaxation after single contraction
Myotonic dystrophy
AD, trinucleotide repeat, abnormal myotonin protein kinase
Impaired energy production during muscle contraction
McArdle disease (glycogen storage disease type 5)
Muscle weakness and cramping DURING exercize; failure of muscle glycogen breakdown due to mutated myophosphorylase
Gram + cocci, Beta-hemolytic
Coagulase negative, Catalase negative
PYR positive
GAS
Necrotizing fasciitis bugs
GAS
S. aureus
C. perfringens
(GBS, Aeromonas hydrophila)
S. agalatiae can cause?
Skin and soft-tissue infection
NEWBORN SEPSIS AND MENINGITIS
CAMP test positive
S. agalatiae (GBS)
Succinylcholine: A/E
Significant K+ release
Life-threatening arrhythmia
In patients @ high risk of hyperkalemia (burns, myopathies, crush injuries, denervating injury/dz)
Succinylcholine
Depolarizing NMJ blocking agent (unlike Ach, NOT degraded by ACE)
(Phase I and Phase II block)
Atracurium
NON-depolarizing NMT blocker
(release histamine –> decreased BP, flushing, bronchoCONSTRICTION)
(metabolized by landanosine –> provoke seizure)
Baclofen
Muscle relaxant: GABA(B) receptors @ level of spinal cord
Dantrolene
Muscle relaxant for MALIGNANT HTN.
Acts on ryanodine receptors on SR –> prevent Ca2+ release into cytoplasm of muscle cell
Psoas muscle
Anterior surface of transverse processes and lateral surface of vertebral bodies T12-L5
Flex thigh
(and lateral rotation/abduction of hip)
Nafcillin
Methicillin
Oxacillin
Penicillinase-resistant penicillins
active against isolates of S. aureus and S. epidermidis that are resistant to other PCNs
Empirical tx for skin/soft tissue infections
folliculitis, abscesses
Nafcillin
Bacterioid species
Gram - rods
Anaerobic
Beta-lactamase producer
Tazobactam
Clavulanic acid
Sulbactam
Beta-lactamase inhibitor
Piperacillin-tazobactam
Extended-spectrum penicillin
+
Beta-lactamase inhibitor
(effective against most Gram negative rods- Pseudomonas, Bacterioides)
Ciprofloxacin: works against?
Gram negative rods (including Pseudomonas, Legionella)
NOT effective against anaerobes
Azithromycin
Binds 50s
For: Chlamhydia, Mycoplasma, H. influenza, M. catarrhalis
Vancomycin for?
MRSA
MRSE
C. diff
Dermatitis (rough, thick, scaly)
Diarrhea (atrophy/ulceration of GI tract)
Dementia (neuronal degeneration)
Pellagra
Niacin, B3, deficiency
Niacin: precursor
Tryptophan
NADP is essential for?
Hexose-monophosphate shunt of glucose metabolism
Population susceptible to pellagra?
Population that primarily subsist on CORN Alcoholics, HIV patients Carcinoid syndrome Hartnup disease Isoniazid for long periods
Arginine is a precursor for?
NO Urea Ornithine Agmatine Creatine
Tyrosine precursor
Phenylalanine
M/c dislocation of shoulder
Anterior dislocation of humerus
fall on outstretched hand, forceful external rotation and aBduction
Axillary nerve
Deltoid, Teres minor
Sensory to LATERAL arm; skin over deltoid
DOWNwd blow on TIP of shoulder
Acromioclavicular joint subluxation
swelling, upward displacement of clavicle, NO nerve damaged
Rotator cuff injury: nerve damaged
NONE
Flattening of deltoid muscle after shoulder injury
Anterior shoulder injury
Ehlers-Danlos: mutation
Collagen type I
lysyl-hydroxylase or pro-collagen peptidase mutation
Marfan syndrome mutation
AD: fibrillin-1 (MF that form sheath around ELASTIN)
Fibrillin abundant in BV, and suspensory ligament of LENS
Epidermolysis bullosa simplex
Defect in keratins 5 and 14
Metronidazole effective against?
Anaerobes (C. diff, Bacteroides)
Parasites (Enatamoeba, Giardia, Trichomonas)
Mefloquine is for?
Prevention and Tx. of P. falciparum infections
Tx. of Lyme disease
Doxycycline or PCN-type antibiotics
Lyme disease manifestation
Early localized: flu-like, erythema chronicum migrans
Early disseminated: AV block; Bell’s palsy
Chronic: asymmetric large joint arthritis, encephalopathy
Lamivudine
Nucleoside reverse transcriptase inhibitor
HIV
Neuroectoderm
CNS
Preganglionic autonomic neurons
Retina
Posterior pituitary
Surface ectoderm
Epidermis, appendages
Mammary glands (modified SWEAT glands)
Lens of eye
Adenohypophysis (Anterior pituitary)
M/c metastatic tumor to brain
Lung cancer
Renal cancer
Melanoma
Melanocyte: embryological origin
Neural crest cells
OI: inheritance
Mostly autosomal dominant
Defective mineralization of bone matrix
VitD deficiency
Associated with myasthenia gravis
Thymoma
Thymic hyperplasia
HPV: virus description
Double strand DNA virus
NON-enveloped
Icosahderal nucleocapsid
High AFP
NT defect
Abdominal wall defect
Multiple gestation
How does eosinophil kill parasite?
Antibody-dependent cellular toxicity (ADCC)
Eosinophil: functions
Defense against parasite
Regulate type 1 hypersensitivity rxn (histaminase, leukotrienes, peroxidase)
Parasite destruction by eosinophils: involvement of complement
NOPE!!!
Complement activation important in which hypersensitivity reaction?
Cytotoxic (type 2)
Immune complex mediated (type 3)
Important clues of AIN
Peripheral eosinophilia
Eosinophiluria
Berkson’s bias
Selection bias created by selecting hospitalized patients as control group.
Pygmalion effect
Researcher’s belief in the efficacy of tx THAT can potentialy affect the outcome
Hawthorne effect
Tendency of study population to affect an outcome due to knowledge of being studied.
Inhibit DHFR
TMP
Methotrexate
Pyrimethamine (antimalarial, toxoplasmosis)
Structural analog of PABA
Compete w/ PABA to inhibit dihydrofolic acid synthesis
SMX
Binds to DNA
Unravel DNA’s helical structure and break its strands
Inhibits protein synthesis
Metronidazole
Cilastatin used in conjunction w?
Imipenem (which binds PBP; inhibit final step in peptidoglycan synthesis)
Cilastatin prevents renal metabolism of imipenem (competitively inhibiting dehydropeptidase on renal tubule brush border)
Bacitracin
Prevent mucopeptide transfer into GROWING cell wall (inhibit cell wall synthesis)
Muscarinic cholinergic AGONIST
Post-surgery urinary retention
Bethanechol
Finasteride
5-alpha reductase inhibitor
for bladder outlet obstruction 2/2 to prostate hypertrophy
Phenylephrine
Alpha-agonist w/ some selectivity for alpha1 receptor
Oxybutynin
ANTI-muscarinic agent
for URGE incontinence
Imipramine: cholinergic vs. anti-cholinergic
ANTI-cholinergic
Postoperative urinary retention: tx w?
Muscarinic AGONIST (bethanechol) alpha-1 blocking drug (relax sphincter)
ill-fitting crutch (crutch palsy)
Radial nerve injury
(courses in axilla before entering posterior arm)
(paralysis/weakness of extensor muscle of forearm, wrist, finger –> wrist drop)
Suprascapular nerve
Supraspinatus: aBduct arm
Infraspinatus: laterally rotate arm
Most abundant amino acid in collagen molecule
Glycine
Sitting up from supine position: hip flexor or extensor
Flexor
(Iliopsoas mostly)
(+ rectus femoris, tensor fascia lata, sartoerius, medial thigh compartment))
Activate phospholipase-c
DAG –> Protein kinase C
IP3 –> calcium –> protein kianse C
Nerves, Arteries, Veins, Lymphatics of ovary are delivered by?
Suspensory ligament of ovary
Cardinal ligament contains?
Uterine artery
Hydroxychloroquine
SLE
or early mild seronegative RA
A/E: permanent retinal damage
Minocycline: A/E
Minimal
Include: photsensitivity
Tx of RA that causes stomatitis and liver function abnormality
Methotrexate
Recurrent infections w/o formation of pus
Delayed separation of umbilical cord
Poor wound healing
Leukocyte adhesion deficiency
AR, absence in CD18 antigen that is necessary for formation of INTEGRIN
Survival of BOTH catalase positive and catalase negative organism
Myeloperoxidase deficiency
vs. chronic granulomatous disease: some phagocytosed organism CAN be killed b/c they make their own hydrogen peroxide
Recurrent infection by Neisseria species
Deficiency of late complement components (C5b –> C9)
Wilson’s diease: lab
Ceruloplasmin is LOW
serum carrier protein for copper
alpha-2 globulins
Produced by liver and kidney
Haptoglobin, Ceruloplasmin, alpha2-macroglobulins
Mucupurulent cervicitis w/ cervical motion tenderness
PID
IL-2
Produced by helper T
Stimulates: CD4+/CD8+, B cells, NK and Monocytes.
T cells and NK cells –> anti-cancer (metastatic melanoma, renal cell carcinoma)
Alemtuzumab
anti-CD52
CLL treatment, direct cytotoxic effect through complement fixation and ADCC
Interferron gamma
Increase expression of MHC-I and II –> improving antigen presentation
Muscle spindle system
Muscle LENGTH
Golgi tendon system
Muscle FORCE/tension
(relatively insensitive to passive stretch)
In series w/ muscle (Ib sensory neurons)
A-delta fibers
Temperature and nociceptive stimuli
Muscle spindles (intrafusal)
Sensitive to changes in LENGTH (streth reflex)
Parallel w/ extrafusal fibers (Ia and II sensory neurons)
Pacinian vs. Ruffini’s end organ
Pacinian: rapidly adapting mechanoreceptors
Ruffini’s: slowly adapting mechanoreceptors
A-beta fibers!
Tx: giardiasis, trichomonas vaginitis, bacterial vaginosis
Metronidazole
Wool business
Ulcer w/ black eschar and significant surrounding edema
Bacillus anthracis
B. anthracis: toxin
Anthrax toxin:
Protective, Lethal, Edema factor
(Lethal factor: increased cAMP by acting as adenylate cyclase)
Bordetella pertusis: toxin
Pertussis toxin (disinhibit adenylate cyclase)
Adenylate cyclase toxin (increase cAMP –> edema, phagocytic dysfunction)
Ulnar nerve
C8-T1
Palmar and dorsal interosseus muslce Hypothenar Palmaris brevis 3rd and 4th lumbricals Adductor pollicis muscle
Ulnar nerve (which also does flexor carpi ulnaris and flexor digitorum profundis-medial section)
Ulnar nerve injury at elbow
Claw hand deformity
Ulnar nerve injury at Guyon’s tunnel
Between hook of hamate, and pisiform bone
Dysesthesia of ulnar side of hand
Weakness to INTRINSIC m. of hand
Difficulty w/ fine motor control of THUMB
Carpal tunnel: median nerve compression
Coracobrachialis muscle
Arm flexor
Innervated by musculocutaneous n.
Gram - rod
NON-lactose fermenting
Oxidase positive
Pseudomonas aeruginosa
Gram - rod
Lactose fermenting
Extensive antibiotic resistance
Nosocomial infections
EnteroBacter cloacae
Gram + cocci
Opportunistic infections
VRE
EnteroCoccus afecalis