[Postural rhinomanometry in normal subjects].

Measurement of decubitus-caused variations in air flow resistance through the nasal cavities indicates the vascular reactivity of turbinate cavernous tissue and makes it possible to evaluate the variable component in nasal resistance; a component usually suppressed by previous pharmacological vasoconstriction. The aim of the present work has been to indicate normative values regarding variations in nasal resistance in different types of decubitus. The latter will be referenced for future studies regarding nasal vasomotor pathologies (specific or aspecific hyperreactivity). Eighty nasal cavities from normal subjects were examined by means of Anterior Active Rhinomanometry in the following positions: seated, supine, homolateral and contralateral to the fossa in question. As absolute values are highly variable even in normal subjects, the resistance variations in decubitus were expressed in percentage of basal value (seated position). In every decubitus there is an average increase in resistance due to the increased venous pressure in the cephalic area although the greatest statistical significance and lowest scattering of values is found in the supine position with 20 degrees head-trunk angle. Mean values and standard deviations are given and will be referenced for further studies on rhinopathology.