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01 February 2006

Effects of dopamine infusion on forearm blood flow in critical patients.

Ornella Piazza, Geremia Zito, Alessio Valente, Rosalba Tufano

Med Sci Monit 2006; 12(2): CR90-93 :: ID: 445243


Background: In critical care, dopamine is administered by infusion at lowdoses (/=5 microg/kg/min) for assessment of hemodynamics. Thepresent study was conducted to explore the effects of dopamine infusion on the vast microvascular networkof skeletal muscle in the early phases of sepsis. Material/Methods: An observational study was performedwhich included twelve critically ill patients. Patients' response to dopamine infusion (3 microg/kg/min)was studied within 24 hours from admission to the ICU. The forearm blood flow (FBF) and vascular resistance(FVR) were measured by near-infrared spectroscopy (NIRS). Results: Dopamine did not ameliorate forearmregional oxygenation. The infusion of dopamine caused an increase in MAP, while FBF decreased with theresistance increase (p>0.05). Conclusions: NIRS was suitable to measure bedside the vascular resistanceand to test the effects of low doses of dopamine on forearm blood flow. A dopamine infusion of 3.0 microg/kg/mincaused a reduction in forearm blood flow and an increase in vascular resistance in our patients.

Keywords: Vascular Resistance - drug effects, Sepsis - physiopathology, Regional Blood Flow - drug effects, Muscle, Skeletal - blood supply, Microcirculation - physiopathology, Infusions, Intravenous, Aged, 80 and over, Hemodynamics - drug effects, Forearm - blood supply, Dopamine - pharmacology, Critical Illness, Critical Care

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750