The current perception threshold objectively evaluates pharyngeal
sensory function
Abstract
Objective: To evaluate pharyngeal sensory function by Current Perception
Threshold (CPT) measurement from healthy and paresthetic pharynx.
Methods: In total, 122 healthy volunteers and 70 patients with
pharyngeal paresthetic symptoms underwent CPT evaluation. Pharyngeal
paresthesia (n=70) were classified into three categories based on
aetiologies: six cases with pain in pharynx; 38 neuropathic patients
with glossopharyngeal nerve and/or vagus nerve injury; and 26 patients
with globus pharyngeus. CPT measurements were obtained from bilateral
palatoglossal arch and tongue base at 2000Hz, 250Hz and 5Hz stimulation
frequencies. Results: Ranked from high to low, the CPT values for the
bilateral palatoglossal arches and tongue bases were: neuropathic
patients, globus pharyngeus and normal patients. The CPT values for
neuropathic patients on the injured side were significantly higher than
those on the healthy side (P<0.05). The CPT values for
patients with pain in pharynx were significantly lower than those of
normal subjects (P<0.05) when the bilateral tongue bases were
stimulated. Conclusion: The CPT testing is a reliable method for
objectively and quantitatively assessing pharyngeal sensory function and
able to differentiate pharyngeal paresthesia between neuropathic and
subjective discomfort. Pharyngeal sensory function is more sensitive in
patients with pain in pharynx. Pharyngeal sensory function is
significantly reduced in neuropathic patients, especially on the injured
side. Patients with globus pharyngeus have pharyngeal hyposensitivity.