Consider the potential positioning, and postural support strategies to protect and promote the motor development of premature infants.

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The survival rate of premature infants has dramatically improved as a result of increasing technological advances, and developments in newborn and infant care. Consequently, clinical practice needs to adapt to an increased demand for care of very premature babies (BAPM, 2003). Accountability rests health care providers to consider the developmental consequences of this progress, and optimise quality of life for this high-risk group. Under the NMC Code of Professional Conduct (2002) nurses should ensure no act or omission on their part is detrimental to the condition or safety of patients. However, practice experience has highlighted difficulties in balancing the immediate needs of these infants with awareness of their long-term developmental requirements. Therefore, this assignment intends to focus on positioning of the premature infant as a possible intervention, with the aim of considering the consequences of premature birth, specifically its association with motor development. Research regarding positional and postural influences on developmental delay, and postural deformities will be presented and explored. Clinical practice will be evaluated against this research, to consider how these infants are presently being protected from these risks (with regards to positioning strategies), and how nurses might enhance infant development, in partnership with the infant’s family. Present influences on practice will be considered, and recommendations with regards to research and practice proposed.

Premature infants are considered to be at increased risk for positional and skeletal deformities, atypical postures, motor gaps and developmental delays (Hack and Fanaroff, 2000; Kessenich, 2003). Medical and technological advances strive to prevent or minimise the pathophysiological causes of developmental problems (i.e. extreme prematurity, intraventricular haemorrhage, chronic lung disease). An extensive literature review conducted by Turill (2002; 2002a) identified studies of both short and long term outcomes, acknowledging another aetiology of atypical development as iatrogenic and largely preventable. Traditionally, the focus of care has been on early recognition and treatment of these disorders. A more effective approach would be an intervention to promote normal neuromuscular development and minimise the chances of developing abnormal movement patterns, such as positioning interventions proposed under the philosophy of developmental care (see appendix a).

Premature infants tend to assume flattened postures because of the effects of illness, weakness, low tone, primitive reflexes, immature motor control, and gravity (Yeo, 1998). Unless therapeutically positioned to promote flexed and midline postures during hospitalisation, iatrogenic positional deformities and abnormal movement patterns may occur. Although many of these problems improve or resolve within the first few years of life (Davis et al, 1998), it is hard to argue that any delay is acceptable if it can be prevented. The potential impact of hindering an infant’s exploration during those critical early months of learning, and the anxiety generated in many parents by these problems, warrants professional attention for prevention.

 

Quality is the right of every patient (DOH, 1998) according to the new NHS, and the introduction of clinical governance makes this a statutory responsibility (Ruiz, 2001). Clinical governance is part of a new approach to ensure quality healthcare (Kings Fund, 1999), and aims to bring together existing methods for improving quality, one of which is putting research into practice.  By considering the results of available research and questioning current practice, knowledge regarding positional and postural influences on developmental outcomes can be enhanced. Such knowledge places nurses in the position to intervene at the earliest interaction with the family to promote infant development and subsequent quality of life.

Motor development of the premature infant differs from that of the full term infant even in the absence of diagnosed abnormality, and when compared with children of their “corrected age” (Lenke, 2003). Term infants demonstrate a strong flexed posture due to remaining in the cramped, relatively well-defined boundaries of the intrauterine environment until 40 weeks gestation.  This physiologic flexion is believed to be vital for development of normal body movement and control. Active muscle tone begins to develop at 36 weeks gestation (Gardner & Lubchencho, 1998). Therefore, pre-term infants are predominantly in an extended posture due to maturation-related hypotonia, demonstrated by a tendency for neck hyperextension, and decreased anti-gravity and midline movements (Dubowitz, 1999).

Foetal and Neonatal movements and postures contribute to the moulding and continued shaping of joints, skull and spinal curvatures in infants. When positioned in a variety of postures they experience varying forces and pressures through the joints and muscles. If infants remain in restrictive body positions, not experiencing a variety of postures they are at risk of skeletal deformity; muscle shortening and contractures; and restricted joint movement (Harris, 1992).

In practice, it has been observed that four hourly positional changes are incorporated into each infant’s daily care plan. This nursing action may therefore be seen as positively influencing joint and muscular development in preparation for coordinated movement.  However, such frequent positional changes were often wavered in the cases of particular neonates, perhaps because of their physiological instability and more immediate needs. This possibly indicates position choice and attainment success might be more likely for special care rather than intensive care babies, since the above factors remain the main priority and focus of care for practitioners. Turill (2003) presents another possible explanation.  She explored neonatal nurses’ attitudes towards their responsibility for a baby’s future outcomes, finding the level of responsibility they professed to have, coupled with the perceived high risk of failure (with regards to intensive care babies’ success in obtaining ‘normal’ outcomes), to pose an unrealistic challenge.

Premature infants do demonstrate poorer outcomes than full term infants, however, it is important for health professionals to put these findings into perspective. This inaccurate and pessimistic outlook may affect their practice, and increase the stress’ on both families and staff. The Epicure study found that – of all babies born before 25 weeks gestation – half of these have no disabilities, 25% have some problems but will live independent lives and only 25% have serious disability. Babies born after 25 weeks gestation generally survive with even fewer problems (Wood, 2000). However, Turill’s findings were based on interviews with only seven nurses, and cannot be generalised as a belief true of all neonatal nurses.

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Studies have shown that premature infants can present with an exaggerated cervical lordosis with neck hyperextension that has been reinforced by endotracheal tubing. This can lead to over-stretching and weakening of the anterior neck flexor muscles, which may cause difficulty with head centring; downward visual gaze; hand coordination to midline/mouth; immature head control when prone; difficulty weight bearing on arms at 4 months (corrected gestational age) and a poorly developed lumbar lordosis at 8 months. (deGroot et al, 1997)

Shoulder retraction may occur as part of a postural pattern of extension in the pre-term infant, effecting midline arm ...

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