Pneumonia is an inflammatory condition of the lung, especially of the alveoli (microscopic
air sacs in the lungs) or when the lungs fill with fluid (called consolidation and exudation). There are many causes, of which infection is the most
common. Infecting agents can be bacteria,viruses, fungi, or parasites. Chemical burns or physical injury to the lungs can also produce pneumonia.
Typical
symptoms include cough, chest pain, fever, and difficulty in breathing. Diagnostic tools include
x-rays and examination of the sputum. Treatment depends on the
cause of pneumonia; bacterial pneumonia is treated with antibiotics.
Pneumonia
is a common disease that occurs
in all age groups. It is a leading cause of death among the young, the old, and
the chronically ill.
Vaccines to prevent
certain types of pneumonia are available. The prognosis depends on
the type of pneumonia, the treatment, any complications, and the person's
underlying health.
Sign and symptom:
People with infectious pneumonia often have a cough producing
greenish or yellow sputum orphlegm and a high fever that may be accompanied
by shaking chills. Shortness of breath is also common, as is
sharp or stabbing chest pain during deep breaths or
coughs. Less frequent symptoms of pneumonia include coughing up blood, headaches, sweaty and clammy skin, loss of appetite, fatigue, blueness of the skin, nausea, vomiting, mood swings, and joint pains or muscle aches. Some forms of
pneumonia can cause specific symptoms. Pneumonia caused byLegionella may cause abdominal
pain and diarrhea, while pneumonia
caused by tuberculosis orPneumocystis may cause only weight loss and night sweats. Symptoms in the
elderly can include new or worsening confusion (delirium) or may experience
unsteadiness, leading to falls. Infants with pneumonia may have many of the
symptoms above, but in many cases they are simply sleepy or have a decreased
appetite.
Physical examination may reveal signs of illness including fever or sometimes low body temperature, anincreased respiratory rate, low blood
pressure, a high heart rate, or a low oxygen
saturation, which is the amount of oxygen
in the blood as indicated by either pulse oximetry or blood gas analysis.
Struggling to breathe, confusion, and blue-tinged skinare signs of a medical emergency.
Findings
from physical examination of the lungs may be normal, but often show decreased
expansion of the chest on the affected side. Harsher sounds from the larger
airways transmitted through the inflamed lung are heard as bronchial breathing on auscultation with a stethoscope.Rales (or crackles) may be heard
over the affected area during inspiration. Percussion may be dulled
over the affected lung, and increased rather than decreased vocal resonance distinguishes pneumonia from a pleural effusion. Because
some of these signs are subjective, physical examination alone is insufficient
to diagnose or rule out pneumonia
Causes:
Pneumonia
can be due to microorganisms, irritants or unknown causes. When pneumonias are
grouped this way, infectious causes are the most common.
The
symptoms of infectious pneumonia are caused by the invasion of the lungs bymicroorganisms and by the immune system's response to the infection. Although more than one
hundred strains of microorganism can cause pneumonia, only a few are
responsible for most cases. The most common causes of pneumonia are viruses and bacteria. Less common causes of infectious pneumonia are fungi and parasites.
Diagnosis:
If pneumonia is suspected on the basis of symptoms and findings from physical examination, further
investigations are needed to confirm the diagnosis. Information from a chest X-ray and blood tests are helpful, and sputum cultures in some cases. The
chest X-ray is typically used for diagnosis in hospitals and some clinics with
X-ray facilities. However, in a community setting (general practice), pneumonia is usually
diagnosed based on symptoms and physical examination alone. Diagnosing
pneumonia can be difficult in some people, especially those who have other
illnesses. Occasionally a chest CT scan or other tests may be
needed to distinguish pneumonia from other illnesses.
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