Aims and pathophysiology: Intensive care patients are exposed to a num
ber of noxious stimuli, They require individual analgesia and sedation
to reduce and moderate the stress response to endogenous and exogenou
s stressors. In patients with SIRS (systemic inflammatory response syn
drome), pathophysiological conditions with multiple organ dysfunction
or failure demand special efforts and a specific regimen of analgoseda
tion. The main goals are the absence of cardiocirculatory depression o
r, if at all possible, cardiocirculatory stabilization, absence of neg
ative pulmonary, renal, hepatic and immunological side effects, preser
vation of a moderate stress response, and vertical and horizontal cont
rol appropriate to the clinical situation. Characterization of analget
ics and sedatives. Amongst the analgesic drugs, opioids and morphine h
ave moderate cardiocirculatory side effects, but reduce the intestinal
motility. Due to intrinsic sympathomimetic activity, ketamine has sta
bilizing cardiocirculatory effects, reduces the exogenous catecholamin
e requirement and has no negative gastrointestinal side effects. Among
st the sedative drugs, midazolam has only moderate cardiocirculatory s
ide effects. Propofol has cardiovascular depressant properties, but ho
rizontal control of propofol sedation is excellent. Conclusion. The ph
armacological profile of analgesic and sedative components suggests, t
hat the combination of ketamine and midazolam can be recommended for a
nalgosedation of patients with SIRS. This is supported by several clin
ical investigations. In specific situations, that require excellent ve
rtical control, the combination of ketamine and propofol should be pre
ferred.