Post-nasal drip Post-nasal drip Post-nasal drip (PND, also termed upper airway cough syndrome, UACS, or post nasal drip syndrome, PNDS) occurs when excessive mucus is produced by the nasal mucosa. The excess mucus accumulates in the back of the nose and eventually the throat once it drips down the back of the throat. It is caused by rhinitis, sinusitis, gastroesophageal reflux disease (GERD), or by a disorder of swallowing (such as an esophageal motility disorder). But also further sources such as an allergy, cold or flu and as a result of medications. However, researchers argue that the flow of mucus down the
Nasal EPAP obstruction. Side effects that emerged during clinical trials included difficulty breathing, difficulty falling or staying asleep, dry mouth, nasal congestion, headache, difficulty putting on or removing the device, and anxiety. Ventus Medical received FDA 510K clearance for marketing the Provent EPAP device for OSA in 2009. Ventus received 510K clearance for an EPAP device to treat snoring in June 2012. Ventus was acquired by Theravent Inc. in 2013. Calik MW. Treatments for Obstructive Sleep Apnea. J Clin Outcomes Manag. 2016 Apr;23(4):181-192. Nasal EPAP Nasal expiratory positive airway pressure (Nasal EPAP) is a treatment for obstructive sleep apnea (OSA) and snoring.