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Smaller veins may collapse as a consequence of too much suction being used when pulling back against the syringe's plunger to check that the needle is in the vein. This will pull the sides of the vein together and, especially if inflamed, they may stick together causing the vein to block.
The tip of the catheter can also be misdirected into the contralateral (opposite side) subclavian vein in the neck, rather than into the superior vena cava. The risk of misplacement is mitigated through the use of ultrasound or fluoroscopic guidance which allows for direct visualization of the catheter during placement.
Chronic cerebrospinal venous insufficiency (CCSVI or CCVI) is a term invented by Italian researcher Paolo Zamboni in 2008 to describe compromised flow of blood in the veins draining the central nervous system. [1] [2] Zamboni hypothesized that it might play a role in the cause or development of multiple sclerosis (MS).
The hypodermic needle reduces contamination for two reasons: First, its surface is extremely smooth, which prevents airborne pathogens from becoming trapped between irregularities on the needle's surface, which would subsequently be transferred into the media (e.g. agar) as contaminants; second, the needle's surface is extremely sharp, which ...
A peripherally inserted central catheter, or PICC line (pronounced "pick"), is a central venous catheter inserted into a vein in the arm (via the basilic or cephalic veins) rather than a vein in the neck or chest. The basilic vein is usually a better target for cannulation than the cephalic vein because it is larger and runs a straighter course ...
Venous cutdown is an emergency procedure in which the vein is exposed surgically and then a cannula is inserted into the vein under direct vision. It is used for venous access in cases of trauma, and hypovolemic shock when the use of a peripheral venous catheter is either difficult or impossible. The great saphenous vein is most
An 18G butterfly needle is inserted into the median cubital vein. Cephalic vein is not used because it bypasses the axillary vein. Then, 30 ml of the contrast is injected through the butterfly needle and spot images are taken. Alternatively, digital subtraction angiography can be used at a fram rate of 1 frame per second. [3]
Blunt-tip or tapered-tip suture needles can be used to sew muscle and fascia. Though they are more expensive than sharp-tipped needles, this cost is balanced by the reduction in injuries, which are expensive to treat. [7] [20] [21] Sharp-tipped needles cause 51–77% of surgical needlestick injuries. [22]