Review Article
Systematic Review: Outcomes by Duration of NPO Status prior to Colonoscopy
Table 2
Summary of studies assessing aspiration events in relation to NPO status.
| Author, year [reference number] Study design, sample size NPO status groups (1 = intervention; 2 = control) | Aspiration | NPO group 1 | NPO group 2 |
| Gurudu et al., 2010 [29] | No episodes of bronchoaspiration were recorded, including in the procedures performed in patients taking same-day bowel preparation | Observational: | NPO status 1: ≥4 hours | NPO status 2: >8 hours |
| Huffman et al., 2010 [31] | None of the patients in any group had clinical evidence of aspiration during their procedures | Observational: | NPO status 1: ≥2 hours | NPO status 2: >8 hours |
| Manno et al., 2012 [41] | No major complications related to sedation | RCT: | NPO status 1: 2 hours | NPO status 2: >8 hours |
| Mathus-Vliegen and van der Vliet, 2013 [43] | No events during 30-day period (from charts of patients and a complication database) | RCT: analyzed | NPO status 1: hours unclear (split-dose exam (p.m.)) | NPO status 2: >8 hours |
| Matro et al. 2010 [44] | 1.6% (1/61) were aspirated during the procedure | 0/54 | RCT, analyzed | NPO status 1: 4 hours (a.m. prep only) | NPO status 2: 4 hours (p.m./a.m. prep) |
| Varughese et al., 2010 [52] | No sedation complications | RCT: | NPO status 1: ≥3 hours | NPO status 2: >8 hours |
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NPO: nil per os; RCT: randomized controlled trial.
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