A chronic cough disorder that is thought to have a neurogenic cause. Sensory neuropathic cough (SNC) ((Bastian RW, Vaidya AM, Delsupehe KG. Sensory neuropathic cough: a common and treatable cause of chronic cough. Otolaryngol Head and Neck Surg. 2006; 135(1): 17-21.)) is also sometimes referred to as a cough caused by “laryngeal sensory neuropathy,” or is sometimes grouped within the more general category of “refractory chronic cough.”
Symptoms of sensory neuropathic cough:
A person with SNC may cough dozens to hundreds of times per day, often also waking up at night to cough. A few of these daily coughing attacks may become violent and last 30 seconds to several minutes. The person’s eyes may tear up and the nose may run; the person may gag or throw up; the person may leak urine, or worse; a few of our patients have even broken one or more ribs during a violent coughing attack.
A key characteristic of SNC is that a coughing attack is typically, though not always, preceded by an abrupt sensation in the throat; this sensation may be described as a “tickle,” a “sudden dry patch,” “like inhaling a powdered doughnut,” “dripping mucus,” or something else.
Possible explanation for sensory neuropathic cough:
SNC is thought to be a relative to neuralgia, like post-herpetic neuralgia (persistent pain long after an outbreak of shingles has resolved), or even diabetic neuropathy (“I feel bees stinging my feet”), except that the sensations felt by SNC patients are not painful. With SNC, it may be that the nerve endings in a person’s throat have become damaged, so that they “misfire” and cause this cough-provoking tickling or similar sensations.
Treatment for sensory neuropathic cough:
Many individuals with SNC have found relief through use of a neuralgia medication, such as amitriptyline, ((Jeyakumar A, Brickman TM, Haben M. Effectiveness of amitriptyline versus cough suppressants in the treatment of chronic cough resulting from postviral vagal neuropathy. Laryngoscope. 2006; 116: 2108-2112.)), desipramine ((Bastian ZJ, Bastian RW. The use of neuralgia medications to treat sensory neuropathic cough: our experience in a retrospective cohort of thirty-two patients. PeerJ. 2015; 3:e816.)), gabapentin ((Ryan NM, Birring SS, Gibson PG. Gabapentin for refractory chronic cough: a randomized, double-blind, placebo-controlled trial. Lancet. 2012; 380(9853): 1583-9.)), pregabalin, oxcarbazepine, and others. These kinds of medications may help to reduce or abolish a person’s coughing by diminishing the nerve-ending “misfires” caused by SNC. In our experience, patients sometimes need to work through more than one of these neuralgia medication options, at varying dosage levels, before they arrive at a satisfactory degree of relief. Another treatment option that can be tried is capsaicin. For more about treatment, see our second video below.
Interview with a sensory neuropathic cough patient:
Second interview with a different sensory neuropathic cough patient:
Sensory neuropathic coughing and throat clearing of 36 Years’ duration:
Fourth interview with a different sensory neuropathic cough patient:
SNC cough phenomenology: different than that of pneumonia, asthma, or acid reflux!
Note: Some aspects of these patient’s experiences are atypical; not every patient has the same experience with SNC.
Bruise caused by violent coughing (1 of 2)
A person with violent sensory neuropathic coughing may injure the vocal cords, as illustrated by this bruise, right vocal cord (left of photo).
Bruise from coughing (1 of 3)
This man had an episode of aggressive coughing a week earlier. Note the bruising over the vocal processes, which receive the major collisional force during coughing.
Pre-phonatory instant (2 of 3)
The vocal processes are approaching the point of touching (contact would occur gently with onset of talking and more aggressively with coughing).
SNC patient (1 of 6)
A very worried patient with sensory neuropathic cough has scheduled a return appointment. On arrival she states that she cannot rest due to a trace of hemoptysis a week earlier. What begins as a simple upper aerodigestive tract examination represented by this view of her normal nasopharynx is easily expanded….
Panoramic view (2 of 6)
Detailed inspection of base of tongue, hypopharynx, and laryngeal vestibule, represented by this panoramic view, also show no abnormality. And the examination can continue…
Lidocaine (3 of 6)
Simple instillation of lidocaine into the trachea allows this view into the upper trachea.