ORLANDO, FLORIDA — , according to Rajeev Bhatia, MD, division chief of pulmonology at Phoenix Children’s in Phoenix, Arizona. Bhatia reviewed both the major causes of chronic cough as well as the rare zebras to watch out for in a presentation at the American Academy of Pediatrics (AAP) 2024 National Conference.
“When you see a patient for cough, the most important thing is, history, history, history,” Bhatia said. “There are many, many, many clues in the history, age of onset, and duration.” That includes starting at birth to ensure you don’t miss key details such as a preterm birth. It’s also important to discuss what the cough sounds like, how frequent it is, what makes it better, what makes it worse, and how it’s affecting the child and others around them — all of which can help narrow the diagnosis.
Jose Quijada, DO, a pediatrician with CommuniCare Pediatrics in San Antonio, found the session “incredibly useful” not only because of the specific pointers about each condition but also because of the realistic case studies he included throughout.
“Sometimes when you’re practicing, you focus on what’s most common,” Quijada said, so it was helpful to get a review of some of the key features and red flags that point to less common causes that may need to be considered. He particularly appreciated the discussion of habitual cough and potential treatments because those can be challenging patients and it can be tough to find a middle ground with how much workup to do.
Common Causes of Chronic Cough
The coughing from inadequately controlled asthma tends to be nonproductive and worse at night or in the early morning, Bhatia explained, and it’s often accompanied by wheezing, shortness of breath, and chest tightness. While fractional exhaled nitric oxide can be useful, “studies show that it is more useful for to monitor the symptoms rather than to diagnose the asthma,” Bhatia told attendees, but he also added that spirometry can be normal in patients with asthma. In young patients, the Asthma Predictive Index can be an invaluable tool, he also said.
Another common cause of chronic cough is a postinfectious cough, which lasts more than 3 weeks after resolution of acute upper respiratory infection. It occurs in about one in 10 children after a viral infection such as a rhinovirus or respiratory syncytial virus infection and results from extensive inflammation and disruption of the airway epithelial integrity. Chest x-rays are usually normal in these patients, and the cough will usually resolve on its own. Albuterol has not been shown to be any more effective than placebo for a postinfectious cough, and antibiotics similarly have no clinically useful role.
A wet cough that lasts for at least 4 weeks and appears to have no other specific cause may be protracted bacterial bronchitis (PBB). While the cause of PBB isn’t known, it could be due to frequent illnesses that cause airway inflammation and injury over time, thereby making it easier for bacteria to grow and cause infection. Risk factors include tracheomalacia/bronchomalacia and childcare attendance, and typical pathogens include Haemophilus influenzae, Streptococcus pneumonia, and Moraxella catarrhalis.
While an x-ray can be done, radiography is often normal in patients with PBB. Bronchoscopy will reveal purulent secretions. PBB should resolve with at least 2 weeks of antibiotics, including amoxicillin-clavulanate, but the course can be extended to 4 weeks if the cough persists. However, about 40% of patients will have recurrence, and those with recurrent PBB or with a chronic cough unresponsive to 4 weeks of antibiotics should be referred to a pediatric pulmonologist.
Upper airway cough syndrome is the updated name for postnasal drip, which can occur with both allergic and nonallergic rhinitis and chronic rhinosinusitis. This is often a dry, throat-clearing cough that can be accompanied by headaches, nasal congestion, and sinus or facial tenderness. An examination will reveal posterior pharynx cobblestoning, Bhatia said, and empirical use of intranasal steroids can be both diagnostic and therapeutic for upper airway cough syndrome. He also emphasized the importance of taking an environmental history and avoiding exposure of environmental triggers.