Cerebral Hemodynamics Patterns by Transcranial Doppler in Patients With Acute Liver Failure

Area of Science:

• Neurology
• Hepatology
• Medical Imaging

Background:

• Acute liver failure (ALF) frequently causes cerebral edema and intracranial hypertension in approximately 50% of patients.
• Current neuroimaging and electroencephalography methods show limited correlation with direct intracranial pressure measurements.

Purpose of the Study:

• To characterize cerebral hemodynamic patterns in acute liver failure (ALF) patients using transcranial Doppler (TCD) sonography.
• To evaluate the utility of TCD in assessing prognosis and guiding treatment in ALF.

Main Methods:

• Twenty-one ALF patients admitted to the ICU were studied.
• Transcranial Doppler (TCD) was performed on arrival to measure flow velocities (systolic, diastolic, medium) and pulsatility index (PI) in the right middle cerebral artery (RMCA).

Main Results:

• The predominant cerebral hemodynamic pattern observed was low-flow (57.1% of patients).
• Other patterns included high resistance (23.8%) and hyperemic (19%).
• Patients who died had significantly lower medium flow velocity (MV) in the RMCA and higher pulsatility index (PI) compared to those who received transplants.

Conclusions:

• Low-flow with increased resistance is the dominant cerebral hemodynamic pattern in ALF patients admitted to the ICU.
• Transcranial Doppler (TCD) is a valuable tool for initial assessment, prognosis, and treatment planning in ALF.