2 doctors weighed in:

For a dialysis, why is the subclavian catheter has darker blood rather than in patient with fistula?

2 doctors weighed in
Dr. Jack Rubin
Internal Medicine - Nephrology & Dialysis
1 doctor agrees

In brief: Catheter vs fistula

An a-v fistula (avf) is a connection between an artery and a vein, that's why its called an a, for artery, v, for vein, fistula.
Arterial blood has more oxygen, making it redder, than venous blood. A subclavian catheter has both blood tubes in the vein, where there is less oxygenated blood, as it does not have any arterial inflow. That's why it has darker blood than an avf.

In brief: Catheter vs fistula

An a-v fistula (avf) is a connection between an artery and a vein, that's why its called an a, for artery, v, for vein, fistula.
Arterial blood has more oxygen, making it redder, than venous blood. A subclavian catheter has both blood tubes in the vein, where there is less oxygenated blood, as it does not have any arterial inflow. That's why it has darker blood than an avf.
Dr. Jack Rubin
Dr. Jack Rubin
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