Problem 3 - Biology of Aging

Question

Briefly define atrophic gastritis. Include the primary cause and the treatment for this disorder in the elderly. What effects does atrophic gastritis have on digestion?

Step-by-Step Solution

Answer

Atrophic gastritis is a condition where chronic inflammation leads to the loss of gastric glandular cells, reducing digestive capabilities. It's primarily caused by H. pylori infection or an autoimmune response. Treatment in the elderly is based on the underlying cause, involving antibiotics for bacterial infection or medication and supplements for autoimmune response. This condition negatively affects digestion as it inhibits proper nutrient absorption.

Step 1: Definition

Atrophic gastritis is a chronic inflammation of the stomach lining that leads to the loss of gastric glandular cells and their replacement by intestinal and fibrous tissues. The replacing of the gastric glandular cells reduces the stomach's ability to produce digestive enzymes and acid.

Step 2: Primary Cause

Atrophic gastritis is primarily caused by a longstanding infection of the stomach lining by the bacterium H. pylori. However, another type called autoimmune atrophic gastritis is caused by the immune system mistakenly attacking the cells in the stomach lining.

Step 3: Treatment for the Elderly

Treatment for atrophic gastritis in the elderly usually involves treating the underlying cause. If it's caused by an H. pylori infection, a combination of antibiotics and medications to decrease stomach acid will be used. In the case of autoimmune atrophic gastritis, it's often managed by treating symptoms and replacing the deficient substances, either through vitamin B12 injections or oral supplements.

Step 4: Effects on Digestion

Atrophic gastritis affects digestion by reducing the production of acids and enzymes needed for proper digestion. As a result, the stomach cannot adequately break down food, which can lead to malabsorption, especially of vitamin B12 leading to pernicious anemia. Additionally, the decreased acid production can allow for excessive bacterial growth that interferes with the absorption of vitamins, minerals, and other nutrients.