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It is almost a certainty that an infant admitted to a Neonatal Intensive Care Unit (NICU) will undergo the insertion of an intravascular catheter. While peripheral intravenous therapy is routine, it has become apparent to clinicians that intravenous extravasation, a complication of peripheral intravenous therapy, can cause significant and long-lasting sequelae in an already compromised infant. Common injuries observed in the NICU include cellulitis, infection, necrosis, scarring, nerve damage, and permanent contractures. A 2004 United Kingdom study, examining extravasation injuries in regional neonatal units, reported the incidence of extravasation injury resulting in skin necrosis to be approximately 4%, with 70% of such injuries occurring in infants ≤ 26 weeks gestation.1
Guidelines should be developed and utilized for the prompt treatment of intravenous extravasation. There is limited research and no standard treatment of extravasation in the neonatal population; treatment has been based on results from case reports and is unit or hospital specific. Intervention with a medication following infiltration is based on the physiochemical characteristics of the infusate, stage of extravasation, and availability of specific medications utilized as antidotes, with the primary goal being minimization of tissue damage around the site. The site where infiltration has occurred should be assessed and staged (staging criteria charts have been developed by Milliam2 and Flemmer & Chan3); this approach will assist in determining the appropriate treatment approach, providing data for process improvement, and for developing a standardized mode of documenting clinical and research notes.
Local Treatment
In 1986, Chandavasu described a multiple puncture technique to be used when acidic or hyperosmolar solutions have infiltrated: multiple perforations are made with a sterile needle over the area of greatest swelling, and the extravasated fluid is manually squeezed out.4 A case report from Casanova, Bardot, and Magalon evaluated the use of three medications: hyaluronidase, phentolamine, and glyceryl trinitrate, all of which have been determined to be effective when injected or used topically to treat an area where infiltration has occurred.5 Infiltrations caused by solutions containing high concentrations of dextrose (10% or greater), calcium, nafcillin, calcium salts, potassium salts, radiocontrast media, hypertonic saline, blood, parenteral nutrition, and sodium bicarbonate can be treated with local injection of hyaluronidase. Hyaluronidase acts to modify the permeability of connective tissue through hydrolysis of hyaluronic acid, improving the circulation of water in the infiltrated area and enhancing the distribution and re-absorption of extravasated fluids through tissues, thereby acting to increase tissue permeability and dilute the infiltrated fluid in the surrounding tissue. Hyaluronidase should not be used if the infiltration is caused by catecholamines (dopamine) or alpha agonists: if a catecholamine were to become extravasated, this vasoconstrictive agent, hyaluronidase, would disperse it to the surrounding tissue, possibly causing damage to a larger area.
A case report by Subahni, Sridhar, and DeCristofaro examined the subcutaneous administration of phentolamine injected within 12 hours to reverse the vasoconstrictive effects caused by catecholamines such as dopamine.6 Phentolamine appeared to be effective, as evidenced by improvement in color and perfusion after injection into the blanched area of infiltration.6 Glyceryl trinitrate (topical form of nitroglycerin) is a potent vasodilator that acts to reduce ischemia due to dopamine infiltration.7 Only a small number of neonates have been evaluated after use of nitroglycerin ointment. However, nitroglycerin may have effects on blood pressure and heart rate, and there is the possibility of over dosage or toxicity owing to absorption through immature skin in a neonate. Its use, therefore, should be limited until more controlled trials can be conducted.7
Each of the studies discussed herein utilized the Gault technique first described in 1993, which consists of an injection of hyaluronidase, saline flush out, and liposuction under local or general anesthesia within 3 to 12 hours of infiltration. The Gault technique was reviewed favorably by the authors, who demonstrated a reduction in necrosis injury.5,8,9 However, guidelines need to be in place in order for the antidote or intervention to be carried out quickly – necessary because effectiveness of such treatment is dependent upon timely administration.
Wound Care
Wound care management after extravasation seeks to promote wound healing and prevent complications such as infection, scarring, and contractures. A retrospective study by McCullen and Pieper (reviewed herein) noted that knowledge of a guideline about skin care and wound management after extravasation is essential to provide proper clinical practice and to promote process improvement.10 Currently, neonatal skin care guidelines recommend maintaining a moist wound environment through the use of topicals (bacitracin, silver sulfadiazine, Aquaphor™, amorphous hydrogels, hydrogel in gel or sheet dressing form), alone or in conjunction with dressings (hydrocolloids [Duoderm®], semipermeable [Opsite™, Tegaderm™], hydrofiber [Aquacel®]). Use of dry dressings, skin cleansers, soaps or antiseptics (Dakins solution, hydrogen peroxide, providine-iodine) should be avoided because these solutions will cause a cytotoxic response and possibly delay wound healing.11 Several studies describing wound care management utilizing topicals and dressings as detailed above reported improved wound healing, prevention of infection, and prevention of early contracture.12,13,14,15 Consultation with plastic surgery and wound debridement (surgical, chemical, autolytic) may be necessary if necrotic tissue impairs wound healing. The retrospective review conducted by Kumar and colleagues (discussed herein), with a small sample size of 9 cases, compared a non-operative conservative approach (daily cleansing, silver sulfadiazine, 0.2% chlorhexidine cream) to early debridement and grafting and demonstrated satisfactory results in both groups.8
Prevention Of Injury
Aware of the severity of complications from an extravasation injury, clinicians currently focus their practice on the treatment of the infiltration and management of the potential wound; however, seeking to prevent the incidence of infiltration and subsequent extravasation may be the better mode of treatment. Prevention may be facilitated by developing standards or guidelines regarding the initiation and maintenance of peripheral intravenous access. In 2006, The Infusion Nurses Society (INS) published standards based on empirical scientific research reflecting current knowledge and practices in infusion therapy, and defined the accountability of nursing in the participation and delivery of infusion therapy.16 While the INS standards of practice are not specific to the neonatal population, they can provide a framework from which infusion based policies and practices may be developed for the NICU. Policies regarding placement of a peripheral intravenous catheter would further help advise healthcare professionals on how to reduce the incidence of complications related to peripheral intravenous therapy. Methodology would include knowledge of factors pertinent to initiation of peripheral vascular access (site selection, device selection, equipment utilized) and maintenance of the patent line (type of infusates appropriate for peripheral lines, assessment of site, and early infiltration detection). Such guidelines would educate clinicians about the importance of maintaining a solid knowledge-base founded on an understanding of basic anatomy, the physiology of vessel wall structure, and the neonatal integumentary system.
Cannulation
Cannulation of a vessel should be based on adequate perfusion of the limb and access to vasculature that is able to accommodate cannula size while persevering blood flow around the cannula; areas of flexion should be avoided as a possible site of cannulation.16 Initiation of a peripheral intravenous (PIV) should be avoided in the following situations: where an intravenous access currently exists in same extremity; in tortuous veins; in an extremity with paralysis, orthopedic, or neurologic problems; and where there is a Blalock-Taussing shunt in the same arm.16
Infusate
The 2006 INS Standards of Practice listed fluids and medications not appropriate for peripheral intravenous infusion, which included infusates with a pH less than 5 or greater than 9 and an osmolality greater than 600 mOsm/L.16 Avoiding the use of infusates considered inappropriate for peripheral intravenous administration is essential because the severity of cellular injury is directly related to the agents infused: more specifically, the infusate volume and physiochemical properties (pH, osmolality, degree of dissociability pKa).17 Infusates considered caustic such as sodium bicarbonate are monitored closely, whereas hyperalimentation solutions are typically monitored less vigilantly – when in fact most contain calcium and can cause severe tissue necrosis when infiltrated. All calcium-containing fluids infused should be vigilantly monitored by the Nurse.
Maintenance
A vigilant assessment of peripheral intravenous sites requires frequent visible inspection of the site with a clear dressing, clinician attentiveness to any changes, and early detection of infiltration. Stabilization of the site should employ a method that provides the best possible site visualization with minimal constriction of the limb, to avoid obstructing vascular circulation. Use of an armboard should be limited to intravenous lines inserted near a joint; in most cases, however, it is unnecessary and it decreases mobility, leading to muscle weakness and contractures.16 Infusion devices have been recommended for use in the neonatal population, and they are designed with an adjustable occlusion pressure alarm which aids in the early detection of infiltration. However, in a recent study conducted by Phelps and Helms, the authors questioned the effectiveness of these tools after demonstrating that infusion device occlusion alarms registered increased pressure readings in only 19% of the cases.18
The development of guidelines for the insertion of peripheral intravenous lines, interventions for infiltration, and wound care management after extravasation are necessary to properly address an issue now recognized for its importance to the neonatal population and for the serious risks associated with peripheral intravenous therapy. The adherence to appropriate guidelines would expedite the use of proper procedures, the effectiveness of which are dependent on a timely response. Future research investigating neonatal tissue extravasation is needed to determine immediate treatment approaches, a protocol for wound care management, and guidelines for best practice in initiation of peripheral intravenous lines. Existing case reports can serve as an excellent foundation from which future studies can expand on issues still left unaddressed.
References
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