Effect of sleep quality on wound healing among patients undergoing emergency laparotomy: an observational study

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Abstract
To study the association between sleep-quality, total sleep duration and wound-healing among adult patients having good sleep-quality at the time of admission in hospital, undergoing laparotomy for various reasons. In this observational study , consecutive adult subjects undergoing emergency laparotomy were followed up until the eighth postoperative day. The primary outcome (wound healing) was assessed using the Southampton Wound Grading System. Sleep quality (assessed by the single item sleep quality scale) was the primary predictor. Pain was assessed using visual analogue pain scale. We studied the effect of postoperative sleep quality on wound healing on postoperative day 8. Secondary analyses assessed the effect of total sleep time, severity of pain and markers of systemic inflammation on wound healing. In this study 110 participants were included. The average age of participants was 41.7±16.2 years. On postoperative day 8, 34.5% rated their sleep quality as "poor to fair" and rest as "good". Postoperative poor sleep quality was associated with impaired wound healing, starting from third postoperative day (P2= 118.40; df=9; P<0.001), classified 92.7% cases correctly and explained 88% variance to the outcome. This model showed that shorter total-sleep-time (P=0.009), higher total leukocyte count (P=0.005), presence of comorbidities (P=0.01) and poor sleep quality during the postoperative week (OR=78.14; P=0.005) increased odds for impaired healing of wound. Poor sleep quality during the healing phase is associated with wound complications, a surrogate marker of impaired wound healing.

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