Effect of different shock conditions on mesenteric hemodynamics

Area of Science:

• Cardiovascular Medicine
• Critical Care Medicine
• Diagnostic Imaging

Background:

• Shock pathophysiology involves reduced effective circulating blood volume and impaired peripheral tissue perfusion.
• The role of superior mesenteric artery (SMA) Doppler ultrasound in various shock conditions remains understudied.

Purpose of the Study:

• To investigate the relationship between SMA Doppler ultrasound parameters and different types of shock.
• To assess the correlation of SMA parameters with cardiac function and lactate levels in shock patients.

Main Methods:

• Evaluated 85 patients (63 with shock, 22 controls) using SMA Doppler ultrasound.
• Measured SMA Peak Systolic Velocity (PSV), End Diastolic Velocity (EDV), Resistance Index (RI), pulsatility index (PI), Time-Averaged Mean Velocity (TAMV), and Blood Flow (BF).
• Compared parameters between shock types and a control group with stable hemodynamics.

Main Results:

• Cardiac shock patients exhibited lower SMA PSV, TAMV, and BF compared to other groups.
• SMA RI and PI were significantly lower in shock patients than controls, but similar across shock types.
• SMA PSV and TAMV correlated with cardiac index (CI); SMA RI and PI correlated with lactate levels.
• SMA RI and PI demonstrated high predictive value for hyperlactatemia (AUC 0.85 and 0.83, respectively).

Conclusions:

• SMA Doppler ultrasound velocity parameters (TAMV, PSV) can indicate cardiac function in shock.
• SMA RI and PI measurements correlate with lactate levels and predict hyperlactatemia.
• SMA Doppler ultrasound may guide fluid resuscitation strategies in shock patients.