Astanga Hrudaya
क्षवकासादिषु तथा यस्यापूर्वो ध्वनिर्भवेत् । ह्रस्वो दीर्घोऽति वोच्च्वासः पूतिः सुरभिरेव वा ॥ २३ ॥
unusual sound which were not present before, appearing in sneezing coughing etc (belching, fart etc.) The respiration becoming either very short or very long, and having either foul smell or sweet smell (does not live)
english translation
kSavakAsAdiSu tathA yasyApUrvo dhvanirbhavet । hrasvo dIrgho'ti voccvAsaH pUtiH surabhireva vA ॥ 23 ॥
hk transliteration by Sanscript