First of all I fully support the idea of small catheters and large veins. However, I must mention that vein diameter may not be a static measurement. Do we need to consider issues such blood pressure and the hydration status of the patient? Do we need to consider the clinical impact of reliable vascular access? When examining PICC to vein ratio we should judge how the impact of PICC placement may allow drug and fluid delivery that will hydrate and improve the contractibility of the heart. The PICC itself as a reliable means of delivering clinical treatments may improve the overall clinical picture and the PICC to vein ration?
Finally, remember… this is opinion not science!