A rheostat is a device which is used to vary the resistance in an electrical circuit without interrupting the circuit.heostats are a kind of potentiometer. These devices can be used in a variety of settings, and are usually designed to be sealed so that environmental factors cannot interfere with the function of the circuit.
What are the types of allergic rhinitis? The two categories of allergic rhinitis include: Seasonal - occurs particularly during pollen seasons. Seasonal allergic rhinitis does not usually develop until after 6 years of age. Perennial - occurs throughout the year. This type of allergic rhinitis is commonly seen in younger children. What are the causes of allergic rhinitis? The most common causes of allergic rhinitis include the following: Pollen ; Dust mites ; Mold ; Animal dander ; What are the symptoms of allergic rhinitis? The following are the most common symptoms of allergic rhinitis. However, each child may experience symptoms differently. Symptoms may include: Sneezing ; Congestion ; Runny nose ; Itchy nose, throat, eyes, and ears ; Nosebleeds ; Clear drainage from the nose ; Children with perennial allergic rhinitis may also have the following:
Bronchiolitis (RSV and wheezing in infants) Bronchiolitis is a viral infection of the lungs, which affects primarily infants and toddlers. Some or all of the following symptoms are present with bronchiolitis. 1  Wheezing: a high-pitched whistling noise when your child breathes out. You may actually hear this yourself, or a physician may hear wheezing when she listens to your child. 2  Rapid breathing: at a rate of 40 breaths per minute or faster.