Study of Different Endoscopic Preparations Used in Pediatric Colonoscopy

• Polyethylene Glycol 4000 with electrolytes (Drug), also known as Bohm solution®: The high volume electrolytes PEG will be administered at a 4 mg/kg dose the day before the procedure in 4-8 hours.
• PEG-3350 with electrolytes (Drug), also known as Movicol®: The low volume electrolytes PEG will be administered at a 4 mg/kg dose the day before the procedure in 4-8 hours.
• Sodium picosulfate (Drug), also known as Picoprep®: The Sodium picosulfate will be administered the day before the procedure at different doses depending on the patient´s age: * From 1 to 2 years old: ¼ sachet reconstituted in ¼ glass of water/juice in the afternoon (15:00 h) and ¼ sachet reconstituted in ¼ glass of water/juice 6 hours later (21:00 h) * From 2 to 4 years old: ½ sachet in ½ glass of water/juice in the afternoon and ½ sachet in ½ glass of water/juice at night. * From 4 to 9 years old: 1 sachet in 1 glass of water/juice in the afternoon and ½ sachet in ½ glass of water/juice at night. * Of 9 years old and older: 1 sachet in the afternoon and 1 sachet at night.

Primary outcomes

• Evaluate the quality of the colonoscopy preparations in our autonomic community comparing different preparation guidelines : Boston Scale [From November 2018 to December 2019]: The quality of the preparations will be measured using the Boston Bowel Preparation Scale (BBPS), semiquantitative evaluation of the cleanliness of the three colon sections (left, transverse, right) using a score from 0 to 3, giving a total score of 0 (without preparation) to 9 (optimal) and it´s done by two independent observers.

Secondary outcomes

• Evaluate the acceptance of the different preparations. [From November 2018 to December 2019]: The acceptance will be measured using a questionnaire and a quantity record, the questonnaire is made by three items: flavour, odour and volume while the quantity record measures the quantity of preparation ingested by the participant.
• Evaluate the tolerance of the different preparations. [From November 2018 to December 2019]: The tolerance will be measured using a questionnaire and a symptoms record, with a score from 0 (terrible tolerance) to 3 (good tolerance) for each of its items, that are the following: abdominal pain, nausea and vomit, intestinal noises, abdominal distension, burps, flatulences, urgent bowel movements and tenesmus.
• Evaluate the security of the different preparations. [From November 2018 to December 2019]: The security will be measured analysing the existence of adverse effects due to the different preparations.

Sex: All, ages: 1 Year to 16 Years

Inclusion Criteria:

* From 1 to 16 years old.
* Patients that signed the informed consent form.

Exclusion Criteria:

* Urgent colonoscopy
* History of intestinal resection
* Nephropathy, heart disease or metabolic syndrome.

• Alejandro Rodríguez Martínez, Principal investigator, Hospital Universitario Virgen Rocío