Efficacy of Free Versus Low Residue Diet as Preparation for Screening Colonoscopy

Exclusion Criteria

• •Contraindication to performing a colonoscopy.
• •Severe renal insufficiency (\<30 ml / min).
• •Known hypersensitivity or allergy to polyethylene glycol, ascorbic acid or sulfate.
• •Known glucose-6-phosphate dehydrogenase deficiency.
• •Known phenylketonuria.
• •Known dyselectrolytemia: hyper / hyponatremia, hyperphosphatemia, hypermagnesemia, hyper / hypokalemia, hypocalcemia.
• •Gastric emptying disorders: Known gastroparesis.
• •Known hypoalbuminemia less than 3.4 g / dl.
• •Crohn's disease or known ulcerative colitis.
• •Participants with difficult-to-control hypertension (SBP\> 170mmHg or TAD\> 100mmHg) or NYHA grade III or IV heart failure.
• •Ascites of any etiology
• •People with cognitive impairment or mental illness that makes it difficult to adhere to instructions.
• •People who do not understand Catalan or Spanish.
• •Factors of poor preparation: liver cirrhosis, diabetes mellitus, treatment with tricyclic antidepressants, opioids or neuroleptics, limited mobility, chronic constipation, history of colon or intestinal resection (appendectomy is not an exclusion criterion), poor preparation in previous colonoscopy Parkinson's disease, multiple sclerosis.