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Scale in French is l'échelle

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Scale in French is l'échelle

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The diameter in millimeters of the catheter can be determined by dividing the French size by 3. 40 Fr = 11.24mm

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Over-inflated on a Swan-Ganz catheter refers to an excessive volume of air or fluid inside the balloon located at the tip of the catheter. The inflated balloon is typically in the pulmonary artery. If over-inflated, the pressure readings can go off the scale due to increased resistance within the blood vessel, leading to inaccurate results and potentially causing harm to the vessel wall.

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The French catheter scale, also known as French gauge or Charriere (Ch) after the creator of the measurement scale, is commonly used in describing the diameter of medical devices/tubing. It was developed in the 1800's by a French surgical instruments maker, Joseph-Frederic-Benoit Charriere, to describe the circumference of medical tubing. The idea is that a non-circular tube will fit into the same incision or blood vessel as a round one. Therefore French size = 2*pi*r (where r is the radius in mm). Usually French size is considered to be 3 times the diameter in millimeters or 1Fr = 1/3mm.
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The code for a Quniton catheter is 36800. The quniton catheter is a catheter that is a dual lumen catheter that is used on a semi-permanent basis.

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