Efficacy of Propofol Combination With Either Ketamine, Dexmedetomidine or Midazolam for Sedation During Upper Gastrointestinal Endoscopic Procedures

The investigators are comparing the efficacy of three different sedative agents in gastrointestinal endoscopic procedures.

Inclusion Criteria: * Both male and female patients aged between 18 and 65 years * Patients who are scheduled for elective upper gastrointestinal endoscopic procedures with sedation * Patients who are classified as ASA (American Society of Anesthesiologists) I and II Exclusion Criteria: * Patient's refusal to participate * Respiratory compromise as patients with respiratory failure or with active chest conditions, e.g., bronchial asthma or pneumonia * Cardiovascular compromise including heart failure and shocked patients * Severe uncontrolled hematemesis with shock or risk of aspiration. * Patients who are allergic or have any contraindications to any of the used drugs. * Patients who have a chronic neuropsychiatric disorder or are on a neuropsychiatric drug. * Patients on long-term sedative medication have a history of drug or alcohol abuse. * Pregnancy and lactation