How does dense connective tissue affect the CT curve of an IM drug?

How does dense connective tissue affect the CT curve of an IM drug?

• A. Dense connective tissue slows absorption, causing a rightward shift and a less steep slope.
• B. Loose connective tissue speeds absorption, causing a leftward shift with a steeper slope.
• C. Dense CT speeds absorption, left shift.
• D. CT composition has no effect.

Answer: (A)

The key idea is how tissue at the injection site controls how fast an intramuscular drug gets into the bloodstream. Dense connective tissue has a lot of collagen and relatively limited blood vessels, so drug must diffuse through tougher tissue before it reaches the capillaries. That slows the absorption process, which shows up on the concentration-time curve as a later peak (rightward shift) and a slower increase during the absorption phase (a less steep slope). In contrast, loose connective tissue is more vascular, so absorption is quicker, shifting the curve left and making the rise steeper. Since tissue composition clearly affects absorption, saying there’s no effect isn’t accurate. Therefore, dense connective tissue slows absorption, producing a rightward shift with a less steep slope.

The key idea is how tissue at the injection site controls how fast an intramuscular drug gets into the bloodstream. Dense connective tissue has a lot of collagen and relatively limited blood vessels, so drug must diffuse through tougher tissue before it reaches the capillaries. That slows the absorption process, which shows up on the concentration-time curve as a later peak (rightward shift) and a slower increase during the absorption phase (a less steep slope). In contrast, loose connective tissue is more vascular, so absorption is quicker, shifting the curve left and making the rise steeper. Since tissue composition clearly affects absorption, saying there’s no effect isn’t accurate. Therefore, dense connective tissue slows absorption, producing a rightward shift with a less steep slope.