**Author details**

**5. Analyzing characteristic of nasal airflow in diseased subjects**

in both the cases in filtered signal. (a) Raw signal and (b) filtered signal.

30 Pathophysiology - Altered Physiological States

The experimental investigation was carried out at Government Siddha Medical College Palayamkottai, Tamil Nadu, India. Totally 260 diseased patients participated in this study from both in-patient and out-patient sections. After receiving a waiver of informed consent form from the Institutional Human Ethical Committee, a retrospective study from various patients is undertaken under the supervision of physician. The nasal airflow for the duration of about 3 minutes is recorded at every 20 minutes to the stretch of 8 hours. Then, the average period of nasal cycle rhythm is calculated. In normal case, the nasal cycle exists for the period of 2–2.5 hours (average) ranges between 20 minutes and 3.6 hours. Whereas in diseased case, the cycle duration greater than 4.5 hours or existence of predominant airflow in particular nostril is

**Figure 7.** Forced exhale hold and inhale hold indicating predominant airflow in right nostril (blue line—filtered signal)

**Figure 6.** Indicating predominant airflow in right nostril (red line—filtered signal) versus left nostril (blue line—filtered

signal) during forced holding of breath after exhale in filtered signal. (a) Raw signal and (b) filtered signal.

Elangovan Muthu Kumaran

Address all correspondence to: reachemk@gmail.com

Dr. B.R. Ambedkar Institute of Technology, Port Blair, Andaman and Nicobar Islands, India
