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The EDM and EDM+ are designed to allow clinicians to guide fluid and drug administration during major and high risk surgery. The monitors are clinically proven and  used to guide Fluid Management, reduce postoperative complications; critical care admissions, critical care stay, length of hospital stay and costs. EDM is the only fluid management technology to be awarded with NICE Guidance (MTG3).

10% Stroke Volume Optimization

Stroke Volume Optimization (SVO) is in its simplest form the administration of fluid, most often a colloid, guided by an algorithm to normalise Stroke Volume without the risk of fluid overload. The 10% SV change algorithm for SVO utilises the Frank-Starling law, which established the relationship between left ventricular stroke volume and left ventricular end diastolic volume.


Treatment algorithm suggested by Professor Mervyn Singer, University Hospital, London.

Only EDM has the precision necessary to guide successfully a 10% Stroke Volume Optimization (SVO) protocol. Its considerable evidence base is testimony to the unique ability of EDM to recognize and monitor 10% changes in Stroke Volume.

Benefits & Evidence

There is a large amount of evidence in support of individually guided intraoperative fluid management. The Evidence Table summarises details of the randomised controlled trials (RCTs) and audit studies reporting patient outcome following IOFM.

The consistent evidence supporting IOFM comes from studies utilising EDM-guided SV optimization compared with routine fluid administration. Intraoperative optimization of SV using EDM consistently results in reductions in both postoperative complications and length of hospital stay in a range of surgical patients, in both RCTs and ‘real world’ settings. Patients who receive intraoperative fluid management guided by EDM exhibit on average:

  • 60% fewer postoperative complications
  • 2 day shorter length of ICU stay
  • 2 day shorter length of hospital stay

The evidence in support of EDM is not limited to surgery. EDM has also demonstrated favourable outcomes when used to guide fluid management in both postoperatively, and in Critical Care.

Evidence Table

This table summarises the clinical outcome evidence regarding Fluid Management. Included, within the table, are studies where a cardiac output monitoring technology (such as the EDM) has been used to optimise circulating blood volume during surgery.

The table clearly summarises the evidence base to support the use of EDM for Fluid Management Evidence Table.