Physiopathological Classification

This classification is based on the most characteristic action of each war gas on the living organism. Various classifications have been made on this basis (German, English, American, etc.). The usual method is to divide the gases into the following classes  

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The physiopathological classification of the war gases, though used very widely, is even less exact than the others mentioned. In point of fact the biological action of these substances is extremely complex and in certain concentrations a gas may change its action to that of another group. 

The maximum uricosuric response to PB allows a physiopathological classification of primary gout in underexcretors (diminished tubular secretion of urate) and normoexcretors (normal tubular secretion of uric acid). 

Meyer s Theory. According to this theory, the physiopathological action of war gases is attributed to certain atoms or radicles which have a tendency to react easily with other substances by addition. This classification on the basis of their ease of reaction should be determined by their combination with the various biological entities or tissues (as the blood, the nerve cells, the respiratory epithelia, etc.) which undergo specific and characteristic alterations. 

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