Korean J Anesthesiol.  2000 Sep;39(3):417-422. 10.4097/kjae.2000.39.3.417.

The Effect of Norepinephrine on Blood Pressure and Blood Flow of the Brachial and Femoral Arteries

• Kim JH
• Park YH
• Nam SB
• Hong YW
• Seo MS
• Kwak YL

• KMID: 2237609
• DOI: http://doi.org/10.4097/kjae.2000.39.3.417

Abstract

BACKGROUND: Arterial pressure is the most commonly utilized guideline for the management of critically ill patients. However, the site of arterial pressure monitoring can impact the observed pressure. In patients undergoing cardiac surgery, peripheral arterial pressure can underestimate central aortic pressure and vasodilators magnify this phenomenon. There was also a large discrepancy between radial and femoral artery pressure in endotoxemic patients treated with vasopressors or hypothermic patients. We evaluated the effect of the continuous infusion of norepinephrine, the most commonly used vasopressor, on pressure and blood flow in both the brachial and femoral artery in dogs in normal condition.
METHODS
Both the brachial and femoral arteries were cannulated for pressure monitoring and the other side arteries were exposed for the measurement of blood flow in 10 dogs. Two doses of norepinephrine (NE), 0.05 microgram/kg/min and 0.1 microgram/kg/min, were infused for 10 minutes each in sequence. Hemodynamic variables and blood flow were measured before the infusion of NE, and immediately after the infusion of the two doses of NE.
RESULTS
NE increased both brachial and femoral arterial pressures with no difference between the two pressures. NE decreased blood flow in both brachial and femoral arteries even though cardiac output was maintained constantly which means NE caused the redistribution of blood flow.
CONCLUSIONS
Unlike endotoxemic shock conditions or hypothermic vasoconstriction, NE didn't show different effects on pressure monitoring sites regardless of their diameter in normal condition. NE increased blood pressure and decreased blood flow in the same degree in both the brachial and femoral artery.

Keyword

Measurement techniques, blood flow: brachial artery; femoral artery; Mornitoring, blood pressure: brachial artery; femoral artery; Sympathetic nervous system: pharmacology; norepinephrine

MeSH Terms

Animals
Arterial Pressure
Arteries
Blood Pressure*
Cardiac Output
Critical Illness
Dogs
Femoral Artery*
Hemodynamics
Humans
Norepinephrine*
Shock
Thoracic Surgery
Vasoconstriction
Vasodilator Agents
Norepinephrine
Vasodilator Agents