Table 3

 Salivary nitrite and nitrate concentrations (µM) before and after nitrate ingestion and 5 minutes after chlorhexidine mouthwash

Time (minutes)Mouthwash
−3003060
ND, not determined.
**p<0.01 compared with before nitrate ingestion (0 minutes).
†††p<0.001 compared with before mouthwash (60 minutes).
Tracheostomised subjects
    Nitrite135 (33)64 (12)860 (244)**1093 (220)**ND
    Nitrate407 (99)806 (424)7397 (1748)**9596 (1831)**ND
Non-tracheostomised subjects
    Nitrite150 (31)236 (91)ND1263 (282)**353 (75)†††
    Nitrate1348 (228)1288 (229)ND10852 (1198)**10397 (1361)**