You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is During epidural analgesia the following points suggests that needle is in the extradural space and explain in detail?
Loss of resistance technique, tactile feedback from the needle, and surface landmarks are traditionally used to guide the epidural needle tip into the epidural space (EDS). Number of newer techniques are now available like ultrasound - Ultrasound imaging with preacquired three-dimensional images of spine, Ultrasound through needle, Ultrasound imaging with preacquired three-dimensional images of spine Modifications of the loss of resistance techniqueMembrane in syringe technique, Epidural balloon, Epidrum, Episure Autodetect, Auditory and visual display of pressure wave