Original articleA survey of inotrope and vasopressor line change practices in Australian and New Zealand Neonatal Intensive Care Units
Introduction
Disruption to the normal pregnancy and birth transition process to newborn life occasionally occurs. Sick and premature neonates who require intensive medical attention are admitted into a specialised unit, the neonatal intensive care unit (NICU) (Gardner et al., 2010).
Preterm and term neonates are admitted to the NICU with a variety of medical and surgical conditions can be provided with respiratory, cardiovascular, neurological, metabolic, nutritional and developmental support (Gardner et al., 2010). Sick and very preterm neonates may not be able to maintain their own blood pressure through normal homeostatic mechanisms.
Close to half of all neonates admitted to the NICU receive cardiovascular intervention for hypotension (Seri and Evans, 2001). The decision to treat a neonate for hypotension is generally based on clinicians' opinions and ‘normal’ blood pressure values based on gestational age of the neonate plus the days in postnatal age as opposed to data bearing physiological reference (Gardner et al., 2010, Seri and Evans, 2001).
The preterm population demonstrates the majority of the patients in the NICU with hypotension. Hypotension in the neonate can cause severe damage to the developing body systems and if left untreated can lead to death (Gardner et al., 2010). Some of the effects of low blood pressure include tissue hypo-perfusion which can lead to organ damage and failure, development or progression of intraventricular haemorrhage and metabolic acidosis (Subhedar and Shaw, 2009, Victor et al., 2006).
Inotropes and vasopressors are two classes of medications that are used in neonates to assist the cardiovascular system to raise systemic blood pressure (Turner and Baines, 2011). Vasopressors are drugs that induce vasoconstriction thereby elevating systemic mean arterial pressure (Harris et al., 2005). Inotropes are drugs that affect cardiac function by enhancing the force of myocardial contraction (Harris et al., 2005). However the majority of drugs have combined effects of inotropes and vasopressors (Turner and Baines, 2011).
Due to the extremely short half-lives of most inotropes and vasopressors these drugs are intravenously infused at a continuous rate in the neonatal population through syringe drivers to provide constant plasma concentrations. The dosage and usage recommendations outlined by the manufacturers of the inotropes and vasopressors state that regular changes are required to maintain full potency of the drugs (Morrice et al., 2004, MIMS Online, 2011). The inotropes and vasopressors when prepared with the compatible solutions remain stable for only 24 h (Morrice et al., 2004).
The time taken and the method by which the process is performed can potentially have an effect on the neonate with cardiovascular compromise. Several methods are practiced for inotrope and vasopressor intravenous infusion changes (Table 1) (De Barbieri et al., 2009, Arino et al., 2004, Llewellyn, 2007, Argaud et al., 2007).
The aim of this research was to identify the clinical practice and the rationales influencing the clinical practice of inotrope and vasopressor solution and associated intravenous tubing line changes in neonates across all NICUs in Australia and New Zealand.
Section snippets
Sample and setting
A descriptive observational quantitative research design was adopted to identify the methods currently in use for inotrope and vasopressor line changes. A web-based survey was created and distributed using Survey Monkey to either the Nurse Unit Manager or Clinical Nurse Educator of all 28 identified Neonatal Intensive Care Units across Australia and New Zealand. The names, addresses and email addresses were obtained from the Australian and New Zealand Neonatal network.
Inclusion criteria
Nurseries were included if
Study population and participants
Twenty eight electronic surveys in total were distributed to every eligible NICU in Australia and New Zealand. Of the 28 surveys distributed, 22 (78.5%) were completed and returned.
Type of hospital the NICU is located within
Of the 22 NICUs, nine (42.9%) are located within a perinatal hospital, four (19.0%) within a surgical/children's hospital and eight (38.1%) within a hospital providing both perinatal and surgical/children's services. One returned survey did not complete this question.
Region of NICU
Of the 22 participating NICUs; four (18.2%)
Do practices differ in the method of inotrope and vasopressor intravenous line changes in the neonatal population?
What is evident from the study findings is that inotrope and vasopressor infusion changes are a frequent practice in Australian and New Zealand NICUs. This is supported by the fact that 63.6% of the NICUs revealed that they would have more than two neonates receiving inotrope and vasopressor therapy at any one time.
It was clear from the results that variation existed in the method used to change inotrope and vasopressor continuous intravenous infusions across Australian and New Zealand NICUs.
Conclusion
This study highlights that inotrope and vasopressor intravenous line changes are a frequent nursing practice in the neonatal intensive care unit. It draws attention to the variation in practices across Australia and New Zealand and diversity in responses for the basis of each unit's current practices. NICUs are actively looking for literature to base their practices, however, there is currently no research which assesses inotrope and vasopressor line changes in the neonatal population. This
Conflicts of interest and source of funding
No conflicts of interest and no funding received from any funding agency.
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