Final answer:
A wandering baseline in ECG is caused by poor electrode connection, often due to substances like lotions on the skin, and can also be affected by other factors such as patient movement or electrical interference.
Step-by-step explanation:
A wandering baseline in the context of electrocardiography (ECG) results from poor electrode connection. This issue can be associated with various substances on the skin, such as lotions, oils, or powders, which can interfere with the electrical signals being measured. Additionally, factors such as patient movement, loose electrodes, and electrical interference from other devices can contribute to a wandering baseline. It is important for the skin to be clean and free of these substances to ensure a clear and stable connection for accurate ECG readings.