Danger of using core/peripheral temperature gradient as a guide to therapy in shock

Area of Science:

• Critical Care Medicine
• Hemodynamics
• Physiology

Background:

• Assessing hemodynamic status in shock is critical for effective patient management.
• Core to peripheral skin temperature gradients have been proposed as a non-invasive indicator of circulatory function.

Purpose of the Study:

• To evaluate the correlation between the central blood to peripheral skin temperature gradient and key hemodynamic parameters in shocked patients.
• To determine if changes in this temperature gradient reflect changes in cardiac index (CI) or systemic vascular resistance (SVR).

Main Methods:

• Measurements of the central blood to peripheral skin temperature gradient were taken in 26 patients experiencing shock.
• Correlation analyses were performed between the temperature gradient and CI, SVR, and systemic vascular resistance index (SVRI).
• Changes in the gradient were also analyzed against concurrent changes in CI, SVR, and SVRI.

Main Results:

• No significant correlation was observed between the core/peripheral temperature gradient and CI, SVR, or SVRI.
• No significant correlation was found between the change in the temperature gradient and the changes in CI, SVR, or SVRI within individual patients.
• These findings indicate a lack of relationship between the temperature gradient and established hemodynamic markers.

Conclusions:

• The core to peripheral skin temperature gradient is not a reliable indicator of hemodynamic status in shock.
• Relying on this temperature gradient for clinical judgment or therapeutic decisions in shock is inappropriate and irrational.
• Alternative, validated hemodynamic monitoring methods are essential for managing shocked patients.