List the techniques / measurements that are available to assess the circulation status of a patient in the intensive care unit.
This question is a "list" question, and thus one should resist the temptation to critically evaluate, or to compare and contrast. A list of techniques is reasonably easy to generate. Specifically, techniques to assess volume-responsiveness are extensively discussed in the section concerned with Fluid Resuscitation, Vasopressors and Inotropes. If one needed to generate a dumb noncomparative list for whatever reason, one should do so in a manner which follows a system of some sort.
Clinical techniques
Pressure-based techniques
Flow-based techniques
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Static indices of fluid responsiveness
Dynamic indices of fluid responsiveness
Assessment of circulatory efficacy
Assessment of microcirculation
Experimental techniques
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Marik, Paul E. "Hemodynamic parameters to guide fluid therapy." Transfusion Alternatives in Transfusion Medicine 11.3 (2010): 102-112.