👉 Phrenotaxis, also known as phrenic nerve syndrome, is a condition characterized by abnormalities in the phrenic nerve, which is a vital nerve that controls breathing and heart rate. The phrenic nerve is a bundle of nerves that runs from the brain to the abdomen and thorax. The symptoms of phrenotaxis can vary widely depending on the individual and their medical history. Common symptoms include: - Difficulty in controlling breathing - Changes in heart rate or rhythm -