CWS practice test with rationales for each choice

Which oral medication has the BEST evidence as an adjunct to compression for improving venous leg ulcer healing?

1. cilostazol

   Cilostazol lengthens walking distance in intermittent claudication, an arterial problem, and is not a venous ulcer adjunct.
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2. hydrochlorothiazide

   Hydrochlorothiazide, a diuretic, may shrink edema briefly but does not treat venous hypertension and has no evidence for ulcer healing.
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3. clopidogrel

   Clopidogrel is an antiplatelet drug for arterial disease and has no role in healing venous ulcers.
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4. pentoxifylline

   Pentoxifylline improves microcirculation and reduces white cell activation, and randomized trials show it speeds venous ulcer healing when added to compression.
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Select an answer to record it. The card then marks the key and opens the reasoning under every choice.

A patient with blood glucose persistently above 250 mg/dL develops repeated wound infections. Hyperglycemia MOST directly impairs:

1. platelet adhesion to exposed collagen

   Hyperglycemia tends to make platelets more reactive rather than less, and platelet adhesion does not govern bacterial clearance.
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2. hepatic acute-phase protein synthesis

   The liver keeps producing acute-phase proteins during hyperglycemia; the infection risk comes from failing white cell function.
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3. neutrophil chemotaxis and phagocytosis

   Sustained high glucose blunts neutrophil migration, phagocytosis and killing, which explains repeated infections in poorly controlled diabetes.
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4. mast cell release of histamine

   Mast cell degranulation is not the defect behind infections in hyperglycemia, and less histamine would not let bacteria thrive.
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Which statement BEST describes the importance of periwound skin in wound healing?

1. It should be kept moist with the same hydrogel used in the wound bed

   Skin around the wound should be kept dry and protected; spreading hydrogel onto it invites maceration.
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2. It supplies migrating keratinocytes and reveals problems such as maceration

   The wound edge and surrounding skin are the source of keratinocytes for epithelialization, and their condition shows maceration, irritation or infection that stall healing.
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3. It serves mainly as an anchor for dressings and has very little biological role

   Treating the surrounding skin as a place to stick dressings ignores that it supplies the cells that close the wound.
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4. It produces most of the wound exudate that keeps the wound bed moist

   Exudate comes from leaky capillaries in the wound bed, not from the intact skin around it.
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Mesenchymal stem cells applied to chronic wounds are thought to promote repair MAINLY through which mechanism?

1. Antibody production that neutralizes bacteria living within the wound biofilm

   Antibodies come from plasma cells derived from B lymphocytes; mesenchymal stem cells do not make them.
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2. Paracrine release of factors that modulate inflammation and angiogenesis

   Applied stem cells survive only briefly in a wound and seem to act mainly by secreting factors that calm inflammation and stimulate new vessels and resident cells.
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3. Formation of the initial hemostatic plug at sites of active bleeding

   Platelets form the first plug at a bleeding site; stem cells have no part in primary hemostasis.
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4. Direct synthesis of keratin to rebuild the stratum corneum barrier

   Keratin is made by epidermal keratinocytes; stem cells are not thought to rebuild the horny layer themselves.
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Prostaglandin E2 released at the wound site during early inflammation produces which effect?

1. Vasodilation, increased permeability and sensitization of pain receptors

   PGE2 widens vessels, makes them leakier and sensitizes nociceptors, producing the redness, swelling and pain of early inflammation.
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2. Cross-linking of collagen fibers in the maturing dermal scar matrix

   Cross-linking during maturation is catalyzed by lysyl oxidase, an enzyme, not by a mediator of early inflammation.
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3. Direct killing of bacteria through disruption of their cell membranes

   Membrane-disrupting bacterial killing is the work of antimicrobial peptides and neutrophils, not prostaglandins.
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4. Direct stimulation of type I collagen synthesis by dermal fibroblasts

   PGE2 tends to restrain fibroblast collagen output rather than drive it; TGF-beta and other growth factors push collagen synthesis.
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The shift of wound macrophages from the M1 to the M2 phenotype is associated with:

1. conversion of macrophages directly into dermal fibroblasts

   Macrophages recruit and activate fibroblasts by signaling; they do not routinely turn into fibroblasts.
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2. increased neutrophil recruitment and further local tissue destruction

   Continued neutrophil influx and tissue damage describe the M1 state that persists in chronic wounds, the opposite of the shift.
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3. arrest of angiogenesis and cessation of collagen deposition

   The M2 shift promotes new vessels and collagen deposition rather than stopping them.
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4. resolution of inflammation and release of growth factors for repair

   M2 macrophages clear apoptotic cells and release growth factors such as TGF-beta and VEGF, ending inflammation and driving the proliferative phase.
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When differentiating arterial from venous ulcer etiology, which finding MOST strongly indicates an arterial etiology?

1. Hemosiderin staining around the gaiter area

   Brown gaiter-area staining comes from red cells leaking out of congested veins, a venous sign.
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2. Edema that improves with leg elevation overnight

   Dependent edema that clears overnight points to venous hypertension, whereas arterial pain gets worse when the leg is raised.
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3. Shallow ulcer with irregular borders and heavy exudate

   A shallow, irregular, heavily draining wound is the typical venous picture; arterial ulcers tend to be dry and punched out.
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4. Absent pedal pulses with a cool foot

   Missing pulses and a cool foot directly reflect reduced arterial inflow and are the strongest arterial clue in the list.
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Plain radiographs of a diabetic foot may remain normal for approximately how long after osteomyelitis begins?

1. 24–48 hours

   Films are still normal at 24–48 hours, but the lag lasts much longer: bone must lose a large share of its mineral before plain films change, which takes about 2–3 weeks.
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2. 2–3 weeks

   Bone must lose a large share of its mineral before plain films change, which usually takes about 2–3 weeks, so an early normal film does not exclude osteomyelitis.
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3. 3–5 days

   A few days is far too short for demineralization to show; MRI picks up marrow changes this early, plain film does not.
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4. 3–6 months

   Changes appear on radiographs long before 3 months in untreated osteomyelitis, so this overstates the lag.
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A patient who cleans home aquariums has a nodular, ulcerating hand lesion that has not responded to two courses of oral antibiotics, and routine swab cultures are negative. Which diagnostic step is MOST appropriate?

1. serum albumin and prealbumin levels to assess the healing capacity

   Serum albumin and prealbumin say nothing about an atypical organism and leave the diagnostic question open.
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2. repeat superficial swab culture after a longer course of cephalexin

   Another swab and more of a drug that already failed repeats the error; atypical mycobacteria need tissue and special cultures.
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3. plain radiograph of the hand to look for gas within the soft tissue

   Gas would point to a fast necrotizing infection, which does not fit a slow lesion, and an X-ray cannot name the organism.
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4. tissue biopsy for histology plus mycobacterial and fungal cultures

   Fish-tank exposure with a nodular hand ulcer that resists routine antibiotics suggests Mycobacterium marinum or a fungal cause; tissue for histology and special media is needed because swabs miss them.
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A patient with a healing pressure injury is being prepared for discharge home. Which tool is MOST appropriate for measuring independence in basic activities of daily living such as bathing, dressing, and transfers?

1. Barthel Index

   The Barthel Index scores independence in basic activities such as feeding, bathing, dressing, toileting and transfers.
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2. Braden Scale

   The Braden Scale predicts pressure injury risk; its mobility and activity items are not a measure of ADL independence.
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3. PUSH Tool

   The PUSH tool tracks pressure injury healing by area, exudate and tissue type and does not measure function.
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4. Bates-Jensen Wound Assessment Tool

   The Bates-Jensen tool rates wound features such as size, edges and exudate, not daily function.
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In a patient with a diabetic foot ulcer, which laboratory result MOST increases the likelihood of underlying osteomyelitis?

1. WBC count of 9,000 cells/µL

   A normal white count is common even with osteomyelitis and does nothing to raise its likelihood.
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2. HbA1c of 8.5%

   An HbA1c of 8.5% reflects poor glucose control, which raises infection risk in general but does not indicate that the bone is infected.
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3. ESR of 85 mm/h

   An ESR above about 70 mm/h considerably raises the likelihood of osteomyelitis under a diabetic foot ulcer.
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4. serum albumin of 3.0 g/dL

   Low albumin reflects inflammation or poor intake and does not point specifically to bone infection.
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A patient's periwound transcutaneous oxygen pressure (TcPO2) on a foot ulcer is 18 mm Hg on room air. How should this be interpreted?

1. Mild hypoxia; heals with dressings

   Readings in the 30s are borderline, but 18 mm Hg is well below that range, and dressings cannot correct ischemia.
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2. Critical hypoxia; healing unlikely

   A periwound TcPO2 below about 20 mm Hg signals severe tissue hypoxia, and healing is unlikely without improving perfusion.
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3. Adequate oxygenation for healing

   Values above roughly 40 mm Hg are considered adequate; 18 mm Hg is far below.
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4. Falsely low from arterial calcification

   Calcified arteries falsely raise the ABI by resisting cuff compression; TcPO2 measures oxygen diffusing through skin and is not distorted that way.
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A plantar ulcer in a patient with diabetes probes to bone, has 3 cm of surrounding cellulitis, and the ankle-brachial index is 0.60. How is it classified on the University of Texas system?

1. grade 3, stage D

   Probing to bone makes it grade 3, and infection (the cellulitis) plus ischemia (ABI 0.60) together make it stage D.
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2. grade 3, stage B

   Stage B is infection without ischemia, which ignores the ABI of 0.60.
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3. grade 2, stage D

   Grade 2 reaches tendon or capsule; an ulcer that probes to bone is grade 3.
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4. grade 3, stage C

   Stage C is ischemia without infection; the 3 cm of cellulitis adds infection and moves it to D.
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A patient has varicose veins, ankle edema, hemosiderin pigmentation with stasis eczema, and a healed venous ulcer scar, with no open wound. What is the CEAP clinical class?

1. C5

   A healed venous ulcer places the leg in C5, which outranks the varicose veins, edema, pigmentation and eczema also present.
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2. C4a

   C4a covers pigmentation and eczema, but a healed ulcer moves the leg up to C5.
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3. C6

   C6 requires an active venous ulcer, and this one has healed.
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4. C3

   C3 is edema; this leg has more advanced skin changes and a healed ulcer, so a higher class applies.
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A patient with ulcerative colitis has a small, painful leg ulcer with a violaceous, undermined border that appeared after minor trauma. Which topical treatment is MOST appropriate?

1. silver sulfadiazine cream twice daily

   Pyoderma is an immune-mediated neutrophilic disorder, not an infection, so an antimicrobial cream does not treat it.
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2. a topical antibiotic such as mupirocin

   Mupirocin targets bacteria and leaves the inflammation that drives pyoderma untouched.
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3. a superpotent topical corticosteroid

   A small, painful ulcer with a violaceous undermined border after minor trauma in inflammatory bowel disease suggests pyoderma gangrenosum; a superpotent topical steroid, or topical tacrolimus, is first-line for limited disease.
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4. collagenase ointment for debridement

   Pyoderma is not a debridement problem: debriding an active lesion risks pathergy and does nothing for the inflammation.
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Which hyperbaric oxygen treatment parameters are typical for a Wagner grade 3 diabetic foot ulcer?

1. 1.0 ATA with 100% oxygen by mask for 24 hours

   Pure oxygen at sea-level pressure is normobaric, not hyperbaric, and a day of it risks pulmonary oxygen toxicity.
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2. 1.1 to 1.3 ATA for 15 to 20 minutes in each session

   Below about 1.4 ATA the treatment does not meet the accepted definition of HBOT, and 15 to 20 minutes is too short to saturate tissue with oxygen.
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3. 4.0 to 5.0 ATA for 4 to 6 hours per session

   Sessions at 4.0 to 5.0 ATA lasting 4 to 6 hours would sharply raise the risk of oxygen-induced seizures and are not used for wound healing.
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4. 2.0 to 2.5 ATA for 90 to 120 minutes per session

   Wound-healing HBOT for a diabetic foot ulcer is usually given at 2.0 to 2.5 ATA for about 90 to 120 minutes, typically once a day.
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Which property is PRIMARILY responsible for the antibacterial effect of medical-grade honey?

1. an alkaline pH that neutralizes toxins

   Honey is acidic, not alkaline, and an alkaline wound environment actually favors bacteria.
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2. high osmolarity combined with a low pH

   High osmolarity from the sugar content draws water out of bacteria, and the low pH of about 3.5 to 4.5 adds inhibition; peroxide and, in manuka honey, methylglyoxal contribute as well.
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3. release of silver ions into the wound

   Silver ions come from silver dressings; honey contains none.
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4. enzymatic digestion of collagen anchors

   Cutting the collagen that anchors devitalized tissue is how collagenase works; honey's cleansing effect is osmotic and autolytic.
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A patient with an ileostomy has a red, itchy peristomal rash with satellite papules under the skin barrier. Which management is MOST appropriate?

1. a thick layer of antifungal cream under the barrier at each change

   A cream leaves a greasy film that keeps the barrier from adhering and causes leaks; powder is the form used under appliances.
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2. a topical corticosteroid ointment under the barrier twice daily

   A steroid can feed a fungal infection, and an ointment under the wafer stops it from sealing.
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3. antifungal powder sealed with a barrier film before applying the pouch

   Satellite papules under a moist barrier suggest Candida; dusting antifungal powder and sealing it with barrier film treats the rash while the wafer still adheres.
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4. leaving the skin open to air without a pouch for 24 hours

   Going without a pouch exposes the skin to ileostomy effluent, adding chemical injury instead of healing.
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A patient treated for breast cancer with axillary node dissection and radiation has recurrent shallow wounds on the affected arm that weep a clear, watery liquid and develop in skin folds. What is the PRIMARY mechanism?

1. surgical scar contracture causing skin tension

   Contracture can limit movement and pull on skin, but it does not explain recurrent wounds that weep clear fluid.
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2. impaired lymphatic drainage with protein-rich fluid

   Node dissection and radiation damage lymph drainage, so protein-rich fluid builds up and leaks through the skin (lymphorrhea), and skin in the folds breaks down again and again.
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3. radiation-induced damage to dermal blood vessels

   Radiation can narrow small vessels, but clear fluid from fold wounds reflects failed lymph drainage rather than ischemia.
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4. bacterial colonization of macerated axillary skin folds

   Folds can harbor bacteria, but clear watery weeping on the treated arm points to lymph leakage, with colonization at most secondary.
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A patient with 45% TBSA burns is 2 weeks post-injury. Which finding is MOST consistent with the expected hypermetabolic response?

1. negative nitrogen balance with muscle wasting

   A major burn sets off a hypermetabolic, catabolic state with negative nitrogen balance and muscle breakdown that can last for months.
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2. resting energy expenditure below baseline

   Energy expenditure rises well above baseline after a large burn, not below it.
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3. persistent hypoglycemia with low insulin

   Stress hormones cause hyperglycemia and insulin resistance, with insulin levels high rather than low.
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4. positive nitrogen balance with weight gain

   Protein breakdown outpaces synthesis in this phase, so nitrogen balance is negative and weight falls.
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Which BEST describes the pathophysiology of calciphylaxis in end-stage renal disease?

1. calcification of small dermal arterioles with ischemia

   Calciphylaxis comes from calcification of small arterioles in the dermis and fat, followed by thrombosis and ischemic skin necrosis.
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2. immune complex deposition in the walls of dermal venules

   Immune complexes in venule walls drive small-vessel vasculitis, which shows up as palpable purpura.
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3. bacterial infection spreading along the fascial planes

   Spread along fascia describes necrotizing fasciitis; calciphylaxis is a vascular process, not an infection.
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4. calcified plaque rupture in large leg arteries

   Plaque in large arteries causes limb ischemia with weak pulses, whereas calciphylaxis involves small skin vessels, often with pulses intact.
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A child with poor hygiene has several punched-out, shallow ulcers on the lower legs covered with thick, adherent gray-yellow crusts and surrounded by red, raised edges. What is the MOST likely diagnosis?

1. Ecthyma of the legs

   Ecthyma is a deeper, ulcerating form of impetigo, usually streptococcal, with punched-out ulcers under thick crusts and raised red edges, typically on the legs.
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2. Cutaneous small-vessel vasculitis of the legs

   Small-vessel vasculitis starts as palpable purpura; crusted ulcers in a child with poor hygiene point to infection.
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3. Pyoderma gangrenosum with pathergy

   Pyoderma ulcers have violaceous, undermined borders and are very painful, without thick gray-yellow crusts.
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4. Insect bite reactions with secondary eczema

   Insect bite reactions cause itchy papules that may be scratched open, not punched-out ulcers under thick adherent crusts.
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A patient with long-standing diabetes has several small, round, painless, light-brown atrophic macules scattered on both shins that have been present for years. Which is the MOST likely diagnosis?

1. diabetic dermopathy

   Diabetic dermopathy, or shin spots, gives small, round, light-brown atrophic macules on both shins that are painless and persist for years.
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2. pretibial myxedema

   Pretibial myxedema of Graves disease forms thick, waxy, raised plaques rather than flat atrophic spots.
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3. necrobiosis lipoidica diabeticorum

   Necrobiosis lipoidica forms larger yellow-brown plaques with shiny atrophic centers and visible vessels, and it may ulcerate.
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4. hemosiderin staining from venous disease

   Hemosiderin causes diffuse brown discoloration of the gaiter area, not scattered round atrophic macules.
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A patient taking hydroxyurea for polycythemia vera for 5 years develops a very painful ulcer over the lateral malleolus. Pedal pulses are normal and the ABI is 1.05. Which is the MOST likely cause?

1. Arterial insufficiency ulcer

   Normal pedal pulses and an ABI of 1.05 make arterial insufficiency unlikely.
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2. Venous leg ulcer

   Venous ulcers favor the medial malleolus with edema and pigmentation and are rarely this painful; the drug history is the stronger clue.
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3. Medication-induced ulcer

   A medication-induced ulcer fits best: years of hydroxyurea can cause very painful ulcers near the malleoli, and with normal pulses and ABI the drug is the likeliest cause; such ulcers often heal only after it is stopped.
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4. Neuropathic foot ulcer

   Neuropathic ulcers are typically painless and plantar, so a very painful malleolar ulcer does not fit.
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What is the PRIMARY purpose of registering a wound care trial on a public registry such as ClinicalTrials.gov before enrollment?

1. to guarantee FDA approval of the product

   Registration is a transparency step; approval depends on the evidence the FDA reviews, not on registering.
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2. to obtain Medicare coverage of the study

   A registry entry does not by itself obtain Medicare coverage, which is a separate payer decision.
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3. to replace institutional review board review

   Review board approval is still required; a public registry entry serves transparency, not participant protection.
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4. to deter selective reporting of outcomes

   Registering a trial before enrollment fixes the planned outcomes in public, so later outcome switching or unreported results can be detected.
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Persistent edema around a lower-leg wound impairs healing PRIMARILY by which mechanism?

1. Increasing arterial inflow and producing hyperemic granulation

   Edema reflects fluid leaving the vessels, often with venous or lymphatic stasis, not greater arterial inflow, and it does not create hyperemic granulation.
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2. Increasing the diffusion distance for oxygen and nutrients to cells

   Edema fluid widens the gap between capillaries and cells, increasing the diffusion distance for oxygen and nutrients, so the tissue becomes relatively hypoxic and healing slows.
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3. Raising tissue temperature enough to denature collagen fibers

   Edema does not raise tissue temperature anywhere near the level that denatures collagen; swollen, poorly perfused tissue tends to be cool if anything.
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4. Diluting wound exudate and washing bacteria out of the bed

   Diluting exudate or washing bacteria out would help rather than harm; edema hurts healing by separating cells from their supply, not by rinsing the wound.
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A bilayer dermal regeneration template with an outer silicone layer is placed on a debrided full-thickness wound. About 3 weeks later the neodermis is well vascularized. Which step is MOST appropriate next?

1. apply a second template directly over the first one

   A second template adds more dermal matrix but no epidermis; the vascularized neodermis is ready for a thin graft instead.
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2. start NPWT at -200 mm Hg over the template

   Starting NPWT at -200 mm Hg adds no epidermis and exceeds the usual settings; what the wound needs now is a thin graft.
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3. leave the silicone layer in place as the permanent epidermis

   The silicone layer is a temporary barrier with no living cells; left in place as an epidermis, it would never achieve closure.
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4. remove the silicone layer and apply a thin skin graft

   Once the neodermis is vascularized, usually after about 2–3 weeks, the temporary silicone layer is peeled off and a thin split-thickness graft supplies the epidermis.
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A day after a pedicled flap is raised, the flap is purple and swollen, capillary refill is very brisk, and a pinprick yields dark blood. Which problem is MOST likely?

1. a hematoma beneath a healthy flap

   A healthy flap over a hematoma keeps a normal color and refill; this flap's purple color and dark, brisk bleeding point to blocked venous outflow.
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2. a normal postoperative appearance

   A normal flap a day after surgery is pink and soft with refill of about 2 seconds, not purple and swollen with dark blood.
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3. venous congestion of the whole flap

   A purple, swollen flap with very brisk refill and dark blood on pinprick shows blood getting in but not out, the picture of venous congestion; the pedicle and dressings need urgent review.
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4. arterial insufficiency of the flap

   Arterial insufficiency of the flap makes it pale and cool, with slow or absent refill and little or no bleeding on pinprick.
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A hospice patient has a malodorous, heavily draining fungating breast tumor wound. Which goal of care is MOST appropriate?

1. excise the wound to reduce the tumor load

   Surgical debulking is a heavy burden at the end of life and is not a wound care goal in hospice.
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2. control odor, exudate, bleeding and pain

   For a hospice patient with a fungating tumor, the realistic aims are to control odor, exudate, bleeding and pain rather than to heal the wound.
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3. apply NPWT to speed granulation tissue

   Negative pressure over malignant tissue is generally contraindicated, and building granulation is not the aim in hospice.
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4. achieve complete closure within 12 weeks

   Complete closure is rarely possible while the tumor is active, and a 12-week target conflicts with hospice goals.
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A wound specialist finds evidence that a colleague has billed for advanced wound procedures that were never performed. What is the MOST appropriate action?

1. inform the affected patients about the improper billing

   Telling patients before any investigation is premature and not the clinician's role; the organization handles disclosure.
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2. record the observations privately but take no action

   Keeping notes without acting leaves the false claims standing and can expose the observer to liability.
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3. report the concern to the compliance office

   Billing for services never provided is potential fraud under federal law, so reporting the concern to the compliance office, the channel set up to investigate and correct it, is right; that office also protects the person reporting.
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4. discuss the concern privately with the colleague first

   A private conversation can alert the colleague, allow records to be changed and delay correction; suspected fraud goes through compliance.
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