Week 3 Flashcards
What is negative pressure wound therapy?
Closed wound dressing system with suction
What does negative pressure wound therapy do?
Applies controlled, sub-atmospheric pressure across open wounds
• 0-125 mmHg
What are the mechanisms of action and benefits of negative pressure wound therapy?
• Removal of exudate • Moist wound environment • Decrease bacterial burden • Reduce edema and excess interstitial fluid - Increases blood flow • Increase in microvascular blood flow • Stimulation of granulation tissue - Mechanical deformation • Promotes wound contraction • Reduces dressing change frequency
What are the general equipments used in negative pressure wound therapy?
• Pump provides suction
- Electric, battery
- Reusable, disposable; large, portable, tiny
• Wound filler or cover transfer pressure across wound bed &
allow fluid to move through & into canister
• Tubing – delivers suction, transports fluids
• Canister – holds evacuated fluids
• Occlusive sheeting provides air-tight seal
- Maintain sub-atmospheric pressure
• Application – simple to complicated
What are the indications for negative pressure wound therapy with acute and chronic wounds?
• VI, pressure injuries, traumatic, surgical, burns,
• Mass casualty & high energy injuries - military
• Bone or tendon exposure – w/protection
• Over grafts – with protection
- removes fluid, compresses, stabilizes/splints
- Intermittent mode contraindicated
What are the indications for negative pressure wound therapy with acute and chronic wounds over sutures?
With protection, intermittent mode contraindicated
• For at-risk pts: removes fluid, approximation
• Disposable units, up to ~7 days
What are the indications for negative pressure wound therapy with pediatrics?
- Special guidelines, lower pressure (50-125)
- Based on age, wt, etiology, location
- Dehydration (also in elderly)
What are the characteristics of negative pressure wound therapy and tissue protection?
• Can apply over any body tissue – with protection
- Adaptic
- Sometimes 3-4 layers
• White foam
- Less aggressive compared to black/green
What are the precautions to take for negative pressure wound therapy?
- Anticoagulants, low platelet count
- Non-enteric & unexplored fistulas
- Over named structures (bone, tendon, organs, vessels, etc.)
- Requires several layers of barrier dressing or use of white foam
- Monitor for bleeding
- Avoid circumferential occlusive sheeting application due to increased risk of ischemia
- Monitor skin condition when placed over bony prominences or prominent hardware due to compression
- Sharp edges of exposed bone should be debrided prior to application to protect soft tissue during compression
- MD notified if drainage in canister is sanguineous, fills w/n 1 hour, or if >2 canisters filled w/n 24 hrs
What are the precautions to take for negative pressure wound therapy in regards to arterial insuffuciency?
AI (not for moderate/severe AI)
• Compression at wound edge causes 1-2.5 cm area of hypoperfusion
- Not a good idea for AI wounds where surrounding tissue is already
compromised
- Use lower pressures
- Intermittent mode - if appropriate
What are the contraindications of negative pressure wound therapy?
• >30% slough/necrotic tissue or over dry wounds
• Untreated osteomyelitis
• Gross inf w/or w/o frank pus or sepsis
• Malignancy except in palliative care
• Lack of hemostasis
• Blood dyscrasia as w/leukemia/hemophilia
• Directly over exposed vessels/by-pass grafts/organs/named structures
• Ischemic wounds w/significant proximal occlusion
• No intermittent over grafts due to high potential for disruption
• No suction devices/pumps in MRI, HBOT, or close to flammable anesthetics
(See specific vendor specifications)
• Any wound showing negative response to initial tx
What are the pre-requisites to do when using negative pressure wound therapy with an infection?
• Pt free of most systemic s/s of gross infection • Necrotic tissue debrided • Abscesses drained • Adequate perfusion • Can be combined w/Ag - Silver dressings • Instillation (V.A.C.) - Wound wash w/o removal of dressing - Antibiotics, saline, etc.
What are the signs of wound deterioration?
- Increased peri-wound erythema
- Repeated need for sharp or surgical debridement
- Increased drainage, bleeding
- Newly observed infection/necrosis
- Increased pain
- Increased wound size
- Newly observed undermining or tracts
How do we know when to discontinue negative pressure wound therapy?
- Goals have been met
- Good granular bed achieved, even w/ skin surface
- No appreciable benefit evident post 48 hrs
- S/s of deterioration
- Development of new infection post NPWT initiated
- Pt discomfort/intolerance
- When other dressings better suit current phase of healing
- Progression too little/no drainage
- Anticoagulants
- Sanguineous drainage (indicating hemostasis has not been achieved), fills canister in 1 hour or > 2 in 24 hours (may require temporary hold on therapy)
What are the different parameter choices for negative pressure wound therapy?
- Filler & protective barriers
- Mode of delivery
- Frequency of change
- Pressure
What are the different wound fillers used for negative pressure wound therapy?
- Black, white, green foam
- Gauze & JP “type” drain
- Flat, simple, disposable “stick on” dressings
What are the modes of delivery of negative pressure wound therapy?
• Continuous - always on • Intermittent - on & off cycles • Variable - up & down but not off • Combination - continuous at first, then intermittent
What are the recommendations for the use of continuous negative pressure wound therapy?
- 80-125 mmHg for most acute wounds & pressure injuries
- 100-125 mmHg over grafts for first 3-5 days
- 80 mmHg shown to give max effects on blood flow
- 50-75 mmHg if pain issue
- 50-75 mmHg for most chronic wounds
- 40-50 mmHg for wounds w/decreased circulation
- 75 mmHg for abdominal wounds due to presence of pressure receptors in abdomen
What are the recommendations for the use of intermittent negative pressure wound therapy?
- 125 mmHg, 5 minutes on/2 minutes off
* 40-75 mmHg for mild arterial wounds (& lower pressures)
What are the recommendations for the use of variable negative pressure wound therapy?
10-125 mmHg depending on etiology & pt comfort
What are the recommendations for the use of combination negative pressure wound therapy?
125 mmHg x first 24 hours, 80 mmHg intermittent
What are the methods to help reduce pain at the dressing change of negative pressure wound therapy?
• Soak wound filler 3-5 minutes w/saline - infuse via tubing
• Protective layer – prevents adherence to fragile tissues
• Xeroform strips around wound edges (allows for more re-ep too)
• Pull occlusive sheeting parallel to the skin
• Skin protectant
• Frequent dressing change (24 verses 48 hours)
• Granulation ingrowth less likely w/gauze
- Greater compression/contraction w/foam compared, less pain
• Pain/discomfort at initial pressure application may last 20 minutes
• White foam may be less painful upon removal vs black foam
• Calcium alginate under foam may reduce removal pain
• At dressing change, cover tissue w/soak to prevent dehydration
• Pain meds prior to dressing change
What are the patient education tips to provide a patient that uses negative pressure wound therapy?
- Basic operation, alarms, how to patch
- Benefit wound healing
- Device “on” 24 hours a day
- Keep tubing open, no kinks
- 24 hour troubleshooting assistance line (if vendor supplies)
- Keep battery charged
- What to do: bleeding, increased pain, etc
What are the different depths recognized when it comes to burns?
- Superficial (1st degree)
- Partial thickness (2nd degree)
- Superficial partial thickness
- Deep partial thickness - Full thickness (3rd degree)
What are the usual presentations of a superficial burn?
- Typically pink or red with erythema, and blanching present. Sensation is usually intact and painful
- Little to no risk of scarring or contracture
How does a superficial burn take to heal?
3-4 days
What are the usual presentations of a superficial partial thickness burn?
- They go into the papillary dermis
- Can vary in shade, but are usually pink, may be moist and may have blistering present
- Blanching may be present,
- Intact with sensation, and very painful
- Low risk of scarring or contracture
How does a superficial partial thickness burn take to heal?
1- 3 weeks
What are the usual presentations of a deep partial thickness burn?
- They go into the reticular dermis
- Usually a mild white appearance
- Blanching is absent
- Sensation is diminished to insensate
- May need surgical intervention
- Moderate to high risk of scarring or contracture
How does a deep partial thickness burn take to heal?
3- 9 weeks
What are the usual presentations of a full thickness burn?
- Vary in appearance, can be red and leathery looking
- Blanching and sensation are completely absent
- Require surgical intervention for healing
- Scarring is typical and skin grafting is likely
What are the different types of causes of burns?
- Scald
- Flame
- Electrical
- Chemical
- Radiation
- Contact
What types of burns does a PT treat?
- Superficial partial thickness
- Deep partial thickness
- Full thickness (3rd degree)
What are the typical treatment methods for a partial thickness burn?
- Irrigation
- Debridement (blisters or dead skin)
- Anti microbial ointment or cream
- Impregnated gauze
- Dry gauze
- Elastic netting
What does a PT do for the treatment of a full thickness burn?
Prepare for grafting and dress the wound to prevent infections
What are PTs responsible for in the treatment of burns?
Early ROM and splinting for contracture and functional limitations prevention.
- Apply dressing to allow movement (do in a figure 8 style)
How are skin grafts typically dressed?
Dressed with soaked gauze and irrigated frequently, splinting incorporated for protection and often finished with compression. Elevation if possible and changed every 1-2 days
How is a graft treated after adherence of the graft (vascularized)?
Ointment with impregnated gauze, gauze wrap and netting
How is wound care for the donor site done?
Moist wound healing principles
What are the most common treatments for scar management and prevention?
- Compression
- Massage
- Silicone
- Exercise
- Splinting
- Positioning
What are the compression recommendation for scar management after a wound?
23 hours a day during maturation, 5-40 mmHg
What are the massage recommendation for scar management after a wound?
Evidence lack for impact on scar, but is useful for mobilizing superficial tissues
What are the things to consider when prescribing exercise for a burn patient?
- Consider the phase of healing
- Stretching to blanching, slow sustained elongation
- Note over aggressive stretching is linked to heterotopic ossification
What is the most recommended position for most burn patients?
Fully extended, elongating along the burn areas to avoid contractures