Piezoelectric sensing: Evaluation for clinical investigation of deviated nasal septum.
Noninvasive objective evaluation of nasal airflow is one of the important clinical aspects. The developed polyvinylidene fluoride (PVDF) sensor enables measurement of airflow through each side of the nose using its piezoelectric property. This study was designed to evaluate the diagnostic capability of the PVDF sensor in assessing the deviated nasal septum (DNS). PVDF nasal sensor uses its piezoelectric property to measure the peak-to-peak amplitude (Vp-p) of nasal airflow in both of the nostrils: right nostril (RN) and left nostril (LN), separately and simultaneously. We have compared the results of PVDF nasal sensor, visual analog scale (VAS), and clinician scale for 34 DNS patients and 28 healthy controls. Additionally, the results were further analyzed by receiver operating characteristic curve and correlation between PVDF nasal sensor and VAS in detecting DNS. We found a significant difference in the peak-to-peak amplitude values of the test group and the control group. The correlation between the PVDF nasal sensor measurements and VAS (RN and LN combined) for test group was statistically significant (-0.807; p < 0.001). Sensitivity and specificity of the PVDF nasal sensor measurements in the detection of DNS (RN and LN combined) was 85.3 and 74.4%, respectively, with optimum cutoff value ≤0.34 Vp-p. The developed PVDF nasal sensor is noninvasive and requires less patient efforts. The sensitivity and specificity of the PVDF nasal sensor are reliable. According to our findings, we propose that the said PVDF nasal sensor can be used as a new diagnostic tool to evaluate the DNS in routine clinical practice.
Department of Instrumentation and Applied Physics, Indian Institute of Science, Bangalore 560012, India.
Roopa G
RG
Manjunatha
Department of Instrumentation and Applied Physics, Indian Institute of Science, Bangalore 560012, India.
Konandur
K
Rajanna
Department of Aerospace Engineering, Indian Institute of Science, Bangalore, India, and.
Roy D
RD
Mahapatra
Department of Ear, Nose, and Throat, M.S. Ramaiah Medical College and Hospital, Bangalore 560054, India.
Srinivas
S
Dorasala
Deviated nasal septum; piezoelectric property; polyvinylidene fluoride; visual analog scale