A child of 11 years old, suffers from cough for more than six months. The cough is dry, sometimes attack-like, mainly begins during the day, and often occurs before sleep. There is no cough at night. CBC is normal, glucose is 4.16, total IgE 111.80, Toxocara, Ascaride are negative, Cytomegalovirus, Mycoplasma are negative, PPD test is negative as well. A chest x-ray is normal. We have already consulted with a therapist, otolaryngologist, pulmonologist, neurologist, gastroenterologist... the cough is still present. What should we do?
First of all, there are no results of whooping cough testing among the results provided above. The disease cannot be ruled out, even if your child was vaccinated. The blood test for antibodies against the whooping cough germ is required (blood test for class M and G antibodies against Bordetella pertussis). Second, even a slight increase in class E antibodies is a reason to visit an allergist and to perform an evaluation of respiratory function with bronchodilator. This method will detect a latent bronchial spasm in your child. Even if the results of the test will be normal, allergologist mast rule out the allergic nature of the cough even if it's not obstructive syndrome. Third, this cough can be due to gastroesophageal reflux. It is difficult to draw any conclusions having no data of gastroenterologist’s consultation. 24-hour acidity monitoring of the stomach and esophagus is carried out to confirm or exclude the presence of reflux. Fourth, you didn’t mention whether x-ray of nasopharynx and paranasal sinuses was done. Perhaps, after all, the pathology is associated with ENT organs.