Pharyngeal anesthesia with articaine 4% or placebo should randomly and double-blindly applied in turns for every volunteer. In details: 3 ml of Articaine 4%solution or placebo (NaCl 0,9%) will be sprayed into the pharynx 5 minutes before beginning of gastroscopy. Also gastroscope will be lubricated with articaine (or placebo) gel(prepared by adding 4% articaine or 0,9%NaCl in placebo grope to Endopurin® endoscopic lubricant at the day of study).

Pharyngeal anesthesia with placebo or articaine 4% should be randomly and double-blindly applied in turns for every volunteer. In details: 3 ml of placebo or Articaine 4% solution should be sprayed into the pharynx 5 minutes before beginning of gastroscopy. Also gastroscope will be lubricated with placebo(or articaine) gel(prepared by adding 4% articaine or 0,9%NaCl in placebo grope to Endopurin® endoscopic lubricant at the day of study).

Articaine is intermediate-acting local anesthetic (amide type). Like other local anesthetic drugs, articaine causes a transient and completely reversible state of anesthesia (loss of sensation) during (dental) procedures.

In dentistry, articaine is used both for infiltration and block injections.

Volunteers were asked to evaluate unpleasantness of gastroscopy (0- most unpleasant, 10-most pleasant), overall satisfaction with gastroscopy (0-extremely dissatisfied 7-extremely satisfied)

Vital signs (heart rate, electrocardiogram, non-invasive blood pressure, peripheral oxygen saturation, end-expiratory carbon dioxide) will be monitored during the gastroscopy and until the discharge.