Which is the most serious complication associated with a supraclavicular block?

Which is the most serious complication associated with a supraclavicular block?

• A. Pneumothorax
• B. Blockade of the phrenic nerve
• C. Spinal blockade
• D. Recurrent laryngeal nerve blockade

Answer: (A)

The main idea here is that the most serious risk of a supraclavicular block is puncturing the pleura, leading to a pneumothorax. In this approach, the needle is advanced near the apex of the lung as the brachial plexus trunks are targeted just above the first rib and behind the clavicle. The pleural dome sits close to this area, so even a small misdirection can breach it. A pneumothorax can rapidly impair ventilation and may require urgent interventions such as supplemental oxygen or chest tube placement, making it the most potentially life-threatening complication of this block. The other potential issues are less dangerous in comparison. Blockade of the phrenic nerve is more commonly associated with interscalene blocks and can cause diaphragmatic paralysis, but it is not as immediately life-threatening as a pneumothorax. Spinal blockade and recurrent laryngeal nerve involvement are rare with a supraclavicular approach and, while they can cause significant symptoms, do not carry the same acute risk to respiration as a pneumothorax.

The main idea here is that the most serious risk of a supraclavicular block is puncturing the pleura, leading to a pneumothorax. In this approach, the needle is advanced near the apex of the lung as the brachial plexus trunks are targeted just above the first rib and behind the clavicle. The pleural dome sits close to this area, so even a small misdirection can breach it. A pneumothorax can rapidly impair ventilation and may require urgent interventions such as supplemental oxygen or chest tube placement, making it the most potentially life-threatening complication of this block.

The other potential issues are less dangerous in comparison. Blockade of the phrenic nerve is more commonly associated with interscalene blocks and can cause diaphragmatic paralysis, but it is not as immediately life-threatening as a pneumothorax. Spinal blockade and recurrent laryngeal nerve involvement are rare with a supraclavicular approach and, while they can cause significant symptoms, do not carry the same acute risk to respiration as a pneumothorax.