In a pregnant female, there is decreased requirement of the spinal anaesthetic agent because of all of the following except –
**Core Concept**
During pregnancy, the requirements for spinal anaesthetic agents decrease due to changes in the spinal anatomy and physiology. The subarachnoid space and epidural veins undergo significant alterations, affecting the distribution and potency of the anaesthetic agent.
**Why the Correct Answer is Right**
Exaggerated lumbar lordosis is not a contributing factor to decreased spinal anaesthetic requirements in pregnancy. In fact, the increased curvature of the lumbar spine might make the injection more challenging. The other options are correct because the decreased volume of the subarachnoid space (B) and engorgement of epidural veins (C) lead to a more rapid absorption of the anaesthetic agent, reducing its effectiveness. However, this is not the case with exaggerated lumbar lordosis.
**Why Each Wrong Option is Incorrect**
**Option A:** Exaggerated lumbar lordosis does not contribute to decreased spinal anaesthetic requirements in pregnancy. In fact, it may make the injection more difficult due to the increased curvature of the lumbar spine.
**Option B:** The decreased volume of the subarachnoid space in pregnancy leads to a more rapid absorption of the anaesthetic agent, reducing its effectiveness.
**Option C:** Engorgement of epidural veins in pregnancy also contributes to a more rapid absorption of the anaesthetic agent, making it less effective.
**Clinical Pearl / High-Yield Fact**
When administering spinal anaesthesia in pregnancy, it is essential to consider the altered anatomy and physiology of the spinal space. A thorough understanding of these changes can help anaesthesiologists optimize the dosing and administration of spinal anaesthetics.
**✓ Correct Answer: A. Exaggerated lumbar lordosis**