References
1. Rex DK, Johnson DA, Anderson JC, et al. American College of Gastroenterology guidelines for colorectal cancer screening 2009 . Am J Gastroenterol 2009 ;104(3):739–50.
2. Caumo W, Schmidt a P, Schneider CN, et al. Risk factors for preoperative anxiety in adults. Acta Anaesthesiol Scand. 2001;45(3):298–307.
3. Mikocka-Walus A a., Moulds LG, Rollbusch N et al. “It's a Tube Up Your Bottom; It Makes People Nervous.” Gastroenterol Nurs . 2012;35(6):392–401.
4. Walker KJ, Smith AF. Premedication for anxiety in adult day surgery. Cochrane database Syst Rev. 2009 ;(4):CD002192.
5. Bradt J, Dileo C, Shim M. Music interventions for preoperative anxiety. Cochrane database Syst Rev 2013 ;6:CD006908.
6. Hansen M V, Halladin NL, Rosenberg J, Gögenur I, Møller AM. Melatonin for pre- and postoperative anxiety in adults. Cochrane database Syst Rev 2015 Jan ;4:CD009861.
7. López-Cepero Andrada JM, Amaya-Vidal A, et al. Anxiety during the performance of colonoscopies: modification using music therapy. Eur J Gastroenterol Hepatol. 2004;16(12):1381–6.
8. Arabul M, Kandemir A, Cȩlik M, Alper E, Akpinar Z, Aslan F, et al. Impact of an information video before colonoscopy on patient satisfaction and anxiety. Turkish J Gastroenterol. 2012;23(5):523–9.
9. Chung KC, Juang SE, Lee KC, et al. The effect of pre-procedure anxiety on sedative requirements for sedation during colonoscopy. Anaesthesia. 2013;68(3):253–9.
10. Jones MP, Ebert CC, Sloan T, et al. Patient anxiety and elective gastrointestinal endoscopy. J Clin Gastroenterol. 2004;38(1):35–40.
11.Ismail S a., Mowafi H a. Melatonin provides anxiolysis, enhances analgesia, decreases intraocular pressure, and promotes better operating conditions during cataract surgery under topical anesthesia. Anesth Analg. 2009;108(4):1146–51.
12.Turkistani a, Abdullah KM, Al-Shaer a a, et al. Melatonin premedication and the induction dose of propofol. Eur J Anaesthesiol. 2007;24(5):399–402.
13.Gebbensleben B, Rohde H. Angst vor der gastrointestinalen Endoskopie - ein bedeutsames Problem? DMW - Dtsch Medizinische Wochenschrift . 2008 ;115(41):1539–44.
14.McEntire J, Sahota J, Hydes T, et al. An evaluation of patient attitudes to colonoscopy and the importance of endoscopist interaction and the endoscopy environment to satisfaction and value. Scand J Gastroenterol . 2013 Mar;48(3):366–73.
15.Paggi S, Radaelli F, Amato A, et al. Unsedated colonoscopy: an option for some but not for all. Gastrointest Endosc . 2012 Feb;75(2):392–8.
16.Umezawa S, Higurashi T, Uchiyama S, et al. Visual distraction alone for the improvement of colonoscopy-related pain and satisfaction. World J Gastroenterol. 2015;21(15):4707–14.
17.Aljebreen AM, Almadi M a., Leung FW. Sedated vs unsedated colonoscopy: A prospective study. World J Gastroenterol. 2014;20(17):5113–8.
18.Khezri MB, Merate H. The effects of melatonin on anxiety and pain scores of patients, intraocular pressure, and operating conditions during cataract surgery under topical anesthesia. Indian J Ophthalmol. 2013 ;61(7):319–24.
19.Patel T, Kurdi MS. A comparative study between oral melatonin and oral midazolam on preoperative anxiety, cognitive, and psychomotor functions. J Anaesthesiol Clin Pharmacol . 2015;31(1):37–43.
20.Orbach-Zinger S, Ginosar Y, Elliston J, et al. Influence of preoperative anxiety on hypotension after spinal anaesthesia in women undergoing Caesarean delivery. Br J Anaesth . 2012 ;109(6):943–9.
21.Baudet J-S, Aguirre-Jaime A. The sedation increases the acceptance of repeat colonoscopies. Eur J Gastroenterol Hepatol. 2012;24(7):775–80.
22.Luck A, Pearson S, Maddern G, Hewett P. Effects of video information on precolonoscopy anxiety and knowledge: a randomised trial. Lancet (London, England) . 1999 ;354(9195):2032–5.
23.Ylinen E-R, Vehviläinen-Julkunen K, Pietilä A-M. Effects of patients’ anxiety, previous pain experience and non-drug interventions on the pain experience during colonoscopy. J Clin Nurs. 2009 ;18(13):1937–44.
24.Kindler CH, Harms C, Amsler F, et al. The visual analog scale allows effective measurement of preoperative anxiety and detection of patients’ anesthetic concerns. Anesth Analg . 2000 Mar ;90(3):706–12.
25.Millar K, Jelicic M, Bonke B, et al. Assessment of preoperative anxiety: comparison of measures in patients awaiting surgery for breast cancer. Br J Anaesth . 1995;74(2):180–3.
26.Facco E, Stellini E, Bacci C, Manani G, Pavan C, Cavallin F, et al. ( VAS-A ) in preanesthesia evaluation. Minerva Anestesiol. 2013;79(12):1389–95.