Objective 

To review minimally invasive cardiac output monitoring devices currently available for use in the intensive care unit.

Data Sources 

Medline search from 1966 to present plus cited reference studies and abstracts from available product literature.

Study Selection 

Selection criteria included published reports and abstracts comparing the accuracy of minimally invasive cardiac output monitors to a “gold standard.”

Data Synthesis 

Many reports have been published on the accuracy of individual minimally invasive cardiac output monitors, but cumulative data reviewing each type of monitor have not been synthesized and made available to the clinician.

Conclusions 

Emerging noninvasive or minimally invasive means of cardiac output monitoring are based on varied physiologic principles and can be used for following hemodynamic trends. Each of these methods has advantages and disadvantages; it is important for the clinician to understand the strengths and limitations of each device to effectively use the information derived.