References
Early enteral nutrition after lower gastrointestinal surgery: impact on hospital stay and complications
Historically, patients were kept fasted after most gastro-intestinal surgeries (Catchpole, 1985). Towards the end of the 20th century, however, several investigators hypothesised that immediate enteral nutrition was feasible and resulted in an improved wound healing response (Schroeder et al, 1991). For example, Moore et al (1989) demonstrated that early enteral feeding was well tolerated in patients with severe abdominal trauma and reduced septic complications. Most studies unequivocally showed that early enteral feeding led to a shorter length of hospital stay and decreased incidence of complications (Zhuang at al, 2013).
It is known that the immediate postoperative period is associated with the stress response, which stimulates neuroendocrine, metabolic and inflammatory responses (McSorley et al, 2016). The neuroendocrine response includes secretion of pituitary hormones and release of catecholamines and cortisols from the adrenal gland. Norepinephrine is released from the nerve endings of the sympathetic nervous system. Insulin secretion decreases and there is transient resistance to insulin, leading to hyperglycaemia immediately following surgery. Further, there is decreased insulin release and increased glucagon secretion from the pancreas as a response to surgery. This response leads to increased levels of glucose in the plasma, protein breakdown and lipolysis-that is, a catabolic state. Additionally, the inflammatory response to tissue injury leads to the release of interleukin-1, tumour necrosis factor-alpha and, later, interleukin-6 from macrophages and monocytes, leading to what is known as systemic acute phase response (Burton et al, 2004).
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