Final answer:
Pericardiocentesis is done by needle insertion through the 4th and 5th intercostal spaces. This procedure involves inserting a needle into the pericardial sac to remove fluid or relieve pressure.
Step-by-step explanation:
Pericardiocentesis is done by needle insertion through the 4th and 5th intercostal spaces. The intercostal spaces are the spaces between the ribs, and the 4th and 5th intercostal spaces are located in the middle-lower part of the chest. This procedure involves inserting a needle into the pericardial sac, which is the protective membrane around the heart, to remove fluid or relieve pressure.