الفهرس 
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Abstract
Acute dyspnea is uncomfortable breathing occur within 24hours to 48hours in children but it is difficult to diagnosed as it has many causes.
Etiology of acute dyspnea can differentiated into cardiac, pulmonary and other causes as cardiac causes are more dangerous than others. Sometimes acute dyspnea may be mixed between cardiac and pulmonary this are more dangerous.
Management of acute dyspnea may be delayed until we reach the final diagnosis so we need rapid investigation to diagnose acute dyspnea.
B-type natriuretic peptide is laboratory investigation and is a cardiac neurohormone secreted from the ventricles in response to volume expansion and pressure overloads which can differentiate the causes of acute dyspnea into cardiac and non-cardiac causes fast enough to improve outcomes of patients and cost.
In our study, we measured BNP to 35 patients with acute dyspnea admitted to emergency room which found that 13 patients out of 35 patients have cardiac causes and 22 patients out of 35 patients have pulmonary causes.
Also in our study, we compared between group of patients who measured to them BNP and other group of patients who did not measure to them BNP which found that BNP measurement has a role in improvement of patients outcome (length of hospital stay, ICU admission, mechanical ventilation and fate) and cost.