Measurement of the expiratory ammonia concentration and its clinical significance.

Abstract:

:Although gaseous ammonia (NH3) can freely enter cells through the plasma membrane where NH3 is cyto(neuro)toxic, NH3 and ionic ammonia (NH4+) contents have not been studied in biological materials. We developed a new method for measurement of expiratory NH3 concentration, which may reflect blood NH3 concentrations. The method is a sensor tube type-gas assay system. Expiratory NH3 concentration in patients with chronic liver diseases increased when their blood ammonia (NH4(+)+NH3) concentrations increased above 90 micrograms/dl (normal range; 12-66 micrograms/dl). However, cirrhotic patients, who had relatively higher expiratory NH3 concentration compared to blood NH3 concentrations (calculated from Henderson-Hasselbalch formula), were found to have subclinical encephalopathy. Measurement of expiratory NH3 concentration may be of clinical significance for the diagnosis of encephalopathy associated with hyperammonemia.

journal_name

Metab Brain Dis

journal_title

Metabolic brain disease

authors

Wakabayashi H,Kuwabara Y,Murata H,Kobashi K,Watanabe A

subject

Has Abstract

pub_date

1997-06-01 00:00:00

pages

161-9

issue

2

eissn

0885-7490

issn

1573-7365

journal_volume

12

pub_type

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