A client with hepatitis B asks about transmission. What is the correct response on how hepatitis B is transmitted?

Epidural anesthesia requires access to the epidural space between the ligamentum flavum and the dura mater. Proper positioning maximizes the intervertebral space by flexing the lumbar spine, allowing for easier needle insertion. This prevents accidental dural puncture or vascular cannulation during the procedure.

A. Supine: Placing a pregnant client flat on her back causes aortocaval compression by the heavy uterus, leading to maternal hypotension and fetal distress. Furthermore, the supine position makes it anatomically impossible for the anesthetist to access the vertebral column for needle placement.

B. Prone: Lying on the abdomen is physically impossible and dangerous for a client in late gestation. The prone position would exert lethal pressure on the gravid uterus and the fetus. It provides no clinical benefit for accessing the spinal canal in an obstetric setting.

C. Sitting or lateral: These positions allow the client to arch their back like a "mad cat," which widens the spinous processes. The sitting position is often preferred for better midline identification, while the lateral decubitus position is used for clients who cannot sit upright. Both facilitate catheter insertion.

D. Standing: A standing position is unstable and unsafe for a client receiving regional anesthesia, as they may experience a vasovagal response or sudden leg weakness. Maintaining the strict stillness required for spinal needle placement is impossible while standing. It is never used for this procedure.

Chorionic Villus Sampling (CVS) is a diagnostic procedure performed between 10 and 13 weeks to detect chromosomal abnormalities. It involves aspirating a small sample of placental tissue either transcervically or transabdominally. While providing early results, it carries a slightly higher risk profile than mid-trimester amniocentesis.

A. Bleeding: The insertion of a catheter or needle into the developing placenta can cause subchorionic or vaginal bleeding. Most post-procedure bleeding is minor, but it must be monitored to ensure it does not lead to pregnancy loss. This risk is inherent to invasive sampling techniques.

B. Infection: Any procedure that bypasses the natural protective barriers of the cervix or skin can introduce bacteria into the uterine cavity. Chorioamnionitis is a rare but serious complication that can jeopardize both the pregnancy and maternal health. Strict aseptic technique is required during the procedure.

C. Fetal anemia: This is not a typical risk associated with CVS, as the sample is taken from the placenta rather than the fetal circulation. Fetal anemia is a more common risk of percutaneous umbilical blood sampling (PUBS). CVS focuses on genetic material within the trophoblastic cells.

D. Hypertension: The CVS procedure does not cause systemic maternal hypertension or preeclampsia. While a client may experience transient stress-induced tachycardia, there is no physiological link between placental tissue sampling and the development of gestational hypertension. It does not alter blood pressure.

E. Miscarriage: CVS carries an estimated procedure-related pregnancy loss risk of approximately 0.2% to 1.0%. The mechanical disruption of the gestational environment or subsequent infection can trigger spontaneous abortion. Counseling must include this risk to ensure informed consent by the client.