Disorders of upper respiratory tract, Biology

DISORDERS OF UPPER RESPIRATORY TRACT:

Common Cold:

It is most frequent and most common infection in infants  and children. Common cold corresponds  to  acute nasopharyngitis or influenza syndrome and may include systemic  febrile illness. 

Etiology

It  is usually caused by viruses viz. Andenovirus, rhinovirus, influenza virus, parainfluenza and respiratory  syncytial  virus. 

These are spread by droplet infection. 

Predisposing, Factors 

Chilling, exposure,  sudden  changes of  temperature,  overcrowding, poor sanitation ad  malnutrition predispose  to common cold. 

Pathogenesis 

The viruses,  first invade  the surface ciliated andnon-ciliated  epithelial  cells resulting in congestion and shedding of  the cilia  followed by invasion of deeper epithelial cells. This leads  to denudation of the mucosa and edema of subepithelial  tissue resulting  in congestion. Initially upper respiratory tract cells are affected but as disease  progresses  lower respiratory tract is also  involved. 

Clinical Features

Initially  there  is  irritation  and  feeling ofnasal  congestion - Sneezing - Nasal discharge initially watery and eventually becomes mucoid or purulent - fever and rigor Medical Management - No Antibiotics  are given unless  there  is secondary bacterial infection - Synptomatic treatment is given with analagesics,  decongestants, antihistamines  et 

Posted Date: 10/26/2012 7:53:07 AM | Location : United States







Related Discussions:- Disorders of upper respiratory tract, Assignment Help, Ask Question on Disorders of upper respiratory tract, Get Answer, Expert's Help, Disorders of upper respiratory tract Discussions

Write discussion on Disorders of upper respiratory tract
Your posts are moderated
Related Questions
Urine Collection: Untimed or random urine specimens are suitable only for few chemical tests (mainly qualitative test). Usually urine sample is collected over a predetermined

Explain the radiation cataract and steroid induced cataract of the eye. Radiation Cataract Exposure to radiation causes discoid posterior sub-capsular opacities. Mechanism o

Why is the fish circulation classified as a simple and complete circulation? Complete circulation is that in which there is no mixture of venous blood and arterial blood. As ci

Q. How Boiling used for sterilization? Though highly unreliable as a sterilization technique and more effective for disinfection, it is used very often. Boiling water in hot wa

Explain Periimplant Marginal Tissues of Mucosal Conditions In addition to the redness and swelling of the marginal tissues, bleeding on probing (BOP), pocket formation, and sup

Information Processing in Sensory Neuron You have previously seen that the sensory neuron transmits the information it receives, as an action potential along its axon. We desc

When the overlap between the thin and thick filaments of a sarcomere in a skeletal muscle is decreasing, the A. total length of the I band minus the length of the H zone is dec

Define Plasma or serum ascorbic acid levels? The serum or plasma ascorbic acid levels are used as an index of ascorbic acid nutrition of humans. The normal serum values vary ov

Define Non-Digestible Oligosaccharides (NDO) Among the various food components, the best prebiotic effects seen to be exerted by the NDOs. They are oligomeric carbohydrates, wh

Density Independent Factors Density independent factors are the extrinsic factors which tend to regulate the density of a population in ways that are not correlated with its