Factors associated with the development of asthma and hay fever in children: the possible risks of hospitalization, surgery, and anesthesia.

The clinical impression of an allergist that early surgery increases the risk for developing asthma or hayfever was followed up by three studies. First, 115 children with pyloric stenosis were followed up and showed above-average prevalence figures. Second, 47 boys with hernia repairs were followed with similar results. Thirdly, 202 children reporting asthma or hay fever were studied for early hospitalizations. They reported more hospitalizations under the age of 2 than did a control group.