Effect of the temperature of nasal lavages on mucociliary clearance: a randomised controlled trial

Background The respiratory epithelium is mainly constituted by caliciform (produces mucus, responsible of keeping moisture and trapping particles) and ciliated cells (transports mucus into the pharynx, by the movement of multiple cilia). For centuries, nasal lavages have been used for different rhinosinusal conditions. Some studies suggest not only a direct effect on the mobilisation of secretions, but also an improvement in mucociliary clearance rates. To our knowledge, the impact of temperature in nasal lavages has been scarcely studied. Methodology/principal We used the saccharin test-applying it in the inferior turbinate and timing the detection of its taste-, to estimate mucociliary clearance rates before and after nasal lavages with saline solution at room (20 degrees C) or body (37 degrees C) temperatures. Results 78 healthy subjects were studied, with a mean saccharin test time of 13.88 min. Then, a nasal lavage was performed, half with 20 degrees C saline and the other with 37 degrees C. In both, times improved from baseline (from 13.66 to 11.59 and 14.06 to 9.4 min, respectively) with p values < 0.05. Conclusions Nasal lavages with saline solution improve mucociliary clearance as measured by saccharin test. Temperature seems to matter, which should be taken into account when indicating nasal lavages to our patients.