Go with the flow

Area of Science:

• Cardiovascular physiology
• Medical device technology
• Clinical monitoring

Background:

• Pulmonary artery catheter thermodilution is the established gold standard for cardiac output (CO) measurement.
• Limitations of the invasive thermodilution technique include risks and complexities.
• There is a clinical need for accurate, less invasive CO monitoring alternatives.

Purpose of the Study:

• To review and evaluate the evidence for minimally invasive and noninvasive cardiac output monitoring devices.
• To compare the accuracy and limitations of alternative CO measurement techniques.
• To inform clinical decision-making regarding CO monitoring selection.

Main Methods:

• Systematic review of literature on four cardiac output devices.
• Analysis of studies comparing device measurements to thermodilution.
• Evaluation of device accuracy, precision, and clinical applicability.

Main Results:

• Evidence on the accuracy of minimally invasive and noninvasive CO devices varies.
• Each alternative technique presents unique advantages and disadvantages.
• Further research is needed to establish the reliability of these devices in diverse clinical settings.

Conclusions:

• No single noninvasive or minimally invasive device has fully replaced the pulmonary artery catheter for CO measurement.
• Clinicians must carefully consider the limitations and evidence base when choosing an alternative CO monitoring method.
• The development of reliable, less invasive CO monitoring remains an active area of research and innovation.