Peripheral Blocks, Ultrasound and Local Anaesthetics
Brachial plexus, truncal and limb blocks, sonoanatomy, needles, adjuvants, total dose and toxicity response.
How to prepare for the current Final FRCA Written
Protect breadth for the 90 SBA paper, then rehearse concise CRQ answers that follow the command, mark allocation and printed answer lines.
Core concepts
Concept 1
Peripheral and fascial-plane blocks require relevant anatomy, needle-tip control, injection observation, dose accounting and a plan for incomplete or excessive spread.
Exam cue: Name the target, structures at risk, expected distribution and how success will be tested.
Concept 2
Ultrasound improves visual information but does not replace asepsis, monitoring, communication, incremental injection or vigilance for toxicity and nerve injury.
Exam cue: Add the milligrams from every local anaesthetic source before judging dose.
Risk pitfalls and guardrails
Watching tissue movement while losing continuous awareness of the needle tip.
Guardrail: Answer the exact lead-in or command instead of reproducing a generic essay.
Comparing solution percentages without converting concentration and volume to total dose.
Guardrail: Answer the exact lead-in or command instead of reproducing a generic essay.
Memory anchors
What makes an ultrasound block systematic?
Confirm patient and side, optimise image, identify target and hazards, track the needle tip, inject incrementally and reassess.
How is local anaesthetic dose calculated?
Convert concentration to milligrams per millilitre, multiply by volume and sum every preparation used.
What reduces injection injury risk?
Patient communication where possible, visible needle control, low-resistance incremental injection and stopping for pain or warning signs.
What is the immediate response to suspected systemic toxicity?
Stop injection, call for help, support oxygenation and circulation, control seizures or arrhythmia and follow the current lipid-rescue protocol.
What must follow the block?
Document technique and dose, test effect, protect the insensate limb, monitor complications and provide rescue analgesia.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
During ultrasound-guided interscalene block, which nerve is commonly affected and may impair respiration?
A patient with severe contralateral diaphragmatic paralysis needs shoulder surgery. Why may interscalene block be unsuitable?
Answer all questions to submit.
Next step personalized recommendations
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Move forward only after this module is stable.
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