Lysis

LYSIS, lysis (from Greek lyo-I resolve), one of the forms of the third period of fever (stadii decrementi), the subsidence of it. L. is characterized by a slow fall in temperature in contrast to crisis (see). The gradual fall in temperature usually corresponds to the gradual subsidence of other symptoms caused by the given disease. Most local infectious processes (bronchopneumonia, pleurisy, phlegmons, purulent parotitis, etc.) end in lysis. Among general acute infectious diseases, an example of L. can be the third stage of typhoid fever. The temperature curve decreases either in steps (Fig. 1) or by giving strong oscillations (Fig. 2). The difference between evening and morning temperature reaches 2-3°. The period of such sharp fluctuations in temperature has been given the name amphibolic stage, or stage of steep curves (steile Kurven). In this case, the morning temperature usually decreases much faster than the evening temperature, often falling from the very beginning of L. to normal figures. Such sharp decreases in temperature are often accompanied by profuse sweating. Chills are much more rarely observed with subsequent increases in temperature. The duration of L. varies from 3 days to 1½-2 weeks. Lit.-see lit. to art. Fever.

Figure

2. It is characterized by a slow fall in temperature in contrast to crisis (see.). The gradual fall in temperature usually corresponds to the gradual subsidence of other symptoms caused by the given disease. Most local infectious processes (bronchopneumonia, pleurisy, phlegmons, purulent parotitis, etc.) end in lysis. Among general acute infectious diseases, an example of L. can be the third stage of typhoid fever. The temperature curve decreases either in steps (Fig. 1) or by giving strong oscillations (Fig. 2). The difference between evening and morning temperature reaches 2-3°. The period of such sharp fluctuations in temperature has been given the name amphibolic stage, or stage of steep curves (steile Kurven). In this case, the morning temperature usually decreases much faster than the evening temperature, often falling from the very beginning of L. to normal figures. Such sharp decreases in temperature are often accompanied by profuse sweating. Chills are much more rarely observed with subsequent increases in temperature. The duration of L. varies from 3 days to 1½-2 weeks. Lit.-see lit. to art. Fever.