what is a gastroscopy
Introduction. A gastroscopy is a procedure where a thin, flexible tube called an end oscope is used to look inside the oesophagus (gullet), stomach and first part of the small intestine (duodenum). It's also sometimes referred to as an upper gastrointestinal endoscopy.The endoscope has a light and a camera at one end. gastroscopy is a very safe procedure, but like all medical procedures it does carry a risk of complications. Possible complications that can occur include: 1  a reaction to the sedative, which can cause problems with your breathing, heart rate and blood pressure.