Medical Science Test 2 Nddc Scholarship

The Billroth II procedure involves the partial removal of the stomach (antrectomy) and the surgical creation of an opening between the remaining stomach and the jejunum (the second part of the small intestine). This is why it is called a gastrojejunostomy. The duodenum is closed off as a blind loop, but remains attached to the biliary system to allow bile and pancreatic enzymes to enter the digestive tract further down.

The Billroth I procedure involves a partial gastrectomy where the pylorus is removed and the remaining part of the stomach is reattached directly to the duodenum. This 'end-to-end' anastomosis is formally called a gastroduodenostomy. It is typically preferred over Billroth II when possible, as it more closely maintains the natural anatomical path of the digestive system.

The Superior Mesenteric Artery (SMA) is one of the three major branches of the abdominal aorta. It supplies the 'midgut' structures, which extend from the lower part of the duodenum to the proximal two-thirds of the transverse colon. The Celiac artery supplies the foregut (stomach, liver, spleen), and the Inferior Mesenteric Artery (IMA) supplies the hindgut (distal colon and rectum).

The standard 'Five Rights' of medication administration are: Right Patient, Right Drug, Right Dose, Right Route, and Right Time. 'Limit' is not part of this fundamental safety checklist. Ensuring these five rights are met before administering any medication is a primary responsibility of healthcare professionals to ensure patient safety and therapeutic efficacy.

The Myenteric plexus is known as Auerbach's plexus. It is located between the longitudinal and circular layers of the muscularis externa throughout the GI tract. It is primarily responsible for coordinating the contractions and relaxations of the intestinal wall (peristalsis). Meissner's plexus is the alternative name for the Submucosal plexus, which controls secretions and local blood flow.

Amylase is the enzyme that initiates the digestion of carbohydrates. Salivary amylase begins this process in the mouth, and pancreatic amylase continues it in the small intestine. It works by breaking the alpha-1,4-glycosidic bonds in starch, converting it into smaller sugars like maltose. Lipase breaks down fats, while trypsin and pepsin are involved in protein digestion.

Ranitidine, Famotidine, and Cimetidine are all H2 blockers that work by competitive inhibition of histamine at the H2 receptors of gastric parietal cells. Sucralfate, however, is a cytoprotective agent. It does not inhibit acid production; instead, it reacts with stomach acid to form a thick, paste-like substance that adheres to ulcer craters, acting as a physical barrier to protect the damaged tissue from further irritation by acid and enzymes.

Cisapride is a gastrointestinal prokinetic agent that acts as a serotonin 5-HT4 receptor agonist. It enhances the release of acetylcholine at the myenteric plexus, which increases the tone and amplitude of gastric contractions, thereby accelerating gastric emptying and improving duodenal coordination. Ranitidine and Famotidine are H2-receptor antagonists used to reduce acid production, while Tranylcypromine is a monoamine oxidase inhibitor (MAOI) used as an antidepressant.

An escharotomy is an emergency surgical procedure used to treat full-thickness (third-degree) circumferential burns. In such burns, the inelastic eschar can act like a tourniquet as oedema develops underneath, potentially causing compartment syndrome or restricting chest expansion. The physician performs longitudinal incisions through the eschar to the level of the subcutaneous fat to relieve this tension and restore circulation or ventilation. Note: The source provided 'a' (Dehiscence) as the answer, but in medical terminology, dehiscence refers to a wound reopening, while the procedure described is definitively an escharotomy.

Diabetic foot ulcers typically occur on weight-bearing areas of the foot, such as the metatarsal heads and the heel, often due to a combination of peripheral neuropathy (loss of sensation) and peripheral vascular disease. Because the patient cannot feel repetitive trauma or pressure in these areas, skin breakdown occurs. Arterial ulcers are more common on the toes or lateral malleolus, while venous ulcers are typically found in the 'gaiter area' above the medial malleolus.