Which of the following signs indicate that an individual may have suffered smoke inhalation injuries from a fire? (SELECT ALL THAT APPLY)

A. Hemolytic is incorrect because hemolytic anemia occurs when red blood cells are destroyed faster than they are produced, often due to autoimmune disorders, infections, certain medications, or inherited conditions. It is not primarily caused by dietary deficiency or blood loss.

B. Sickle-cell is incorrect because sickle-cell anemia is a genetic disorder in which abnormal hemoglobin causes red blood cells to take on a sickle shape, leading to hemolysis and impaired oxygen transport. Diet and blood loss do not cause this condition.

C. Pernicious is incorrect because pernicious anemia is caused by vitamin B12 deficiency, often due to the lack of intrinsic factor in the stomach, leading to impaired red blood cell production. While diet can contribute in rare cases, it is usually related to malabsorption, not simple dietary insufficiency.

D. Iron-deficiency is correct because this type of anemia results from insufficient iron, which is necessary for hemoglobin production. It is commonly caused by chronic blood loss (e.g., menstruation, gastrointestinal bleeding) or a diet low in iron. Without adequate iron, the body cannot produce enough hemoglobin, leading to small, pale red blood cells and symptoms like fatigue, pallor, shortness of breath, and dizziness. Iron supplementation and dietary changes are the main treatments.

A. Barrel chest is correct because advanced emphysema causes hyperinflation of the lungs due to air trapping. Over time, the anteroposterior diameter of the chest increases, giving the characteristic “barrel-shaped” appearance. This occurs because the alveoli are damaged, air is retained, and the lungs remain chronically overinflated, which also flattens the diaphragm and contributes to difficulty with effective respiration.

B. Constant productive cough is incorrect because a productive cough is more characteristic of chronic bronchitis, another form of COPD. Emphysema primarily involves alveolar destruction and airflow obstruction, so cough is usually minimal or dry in contrast to chronic bronchitis.

C. Underinflation of the lungs is incorrect because emphysematous lungs are overinflated, not underinflated. Hyperinflation leads to increased residual lung volume and the “barrel chest” deformity.

D. Arched diaphragm is incorrect because in emphysema, the diaphragm becomes flattened, not arched, due to lung hyperinflation and air trapping. A flattened diaphragm reduces the efficiency of inspiration, contributing to shortness of breath and use of accessory muscles.