...is when Emma is scheduled to have the swallow study test. The team met today and decided that Emma should have
2 separate studies, one to see if she is aspirating when she swallows (tomorrows test), and another to see if she is refluxing after she feeds. Unfortunately, the two tests can't be done at the same time, so we'll have to wait another 5 days to have the 2nd test.
To clarify a bit, the docs aren't convinced that Emma is aspirating when she swallows. While she is at a higher risk of aspirating (given that her left vocal cord is paralyzed in an "open" position) she hasn't shown the "classic" symptoms, doesn't choke when she feeds, and hasn't had problems protecting her airway. Nevertheless, the team wants to have the swallow study done to completely rule this out as a potential contributor to her respiratory distress.
The docs believe that
reflux is the main problem. They think that Emma might have always had
some reflux, but the combination of her age (reflux seems to 'develop' in babies between 1-4 months of age and Emma is now 9 weeks, corrected age), her recent respiratory infection, and the fact that she is now taking greater amounts of milk at each feed have conspired to cause her current difficulties. Reflux is a common gastrointestinal problem in premature babies. It occurs when the stomach acid and partially digested food flow back up through the lower esophageal sphincter into the esophagus. All children and adults will naturally reflux throughout the day, especially after eating. However, if the muscle opens too frequently and refluxing occurs too often, complications can develop.
Premature infants have an increased risk of developing reflux. There are several medical conditions that can cause reflux, but in preterm infants, the most common causes are immature muscles and abnormal breathing from chronic lung disease. If the lower esophageal sphincter is weak or underdeveloped, it can remain open when it should be closed, letting the stomach contents flow back up the esophagus. When a baby breathes abnormally because of chronic lung disease, the muscles used for breathing work harder. As these muscles work hard to breathe, they can pull on the muscles near the top of the stomach, stretching the sphincter and causing it to remain open. When the stomach contents flow inappropriately up into the esophagus they bring acid from the stomach. As the acid irritates the tissue inside the esophagus, it becomes inflamed and reddened (which the scope last week indicated). If the reflux is severe, the stomach contents may go high enough into the esophagus to be aspirated or spilled into the lungs causing choking, color changes, frequent respiratory infections, apnea (breathing slows or stops) and/or bradycardia (slowed heart rate). So, Emma will have another test in 5 or 6 days to assess the reflux situation. In the meantime, she'll continue on the reflux meds. If the study tomorrow shows no (or very minimal) feeding aspiration, she should be able to go come home later this week, as long as she no longer needs supplemental oxygen. As of now, Emma has not needed any oxygen for 14 hours. She has to go at least 24 hours without O2 in order to go home, so she's well on her way :)