Ambulatory electrocardiography, also known as Holter monitoring, is a technique for performing electrocardiography (ECG or EKG) on patients for an extended period - typically 24 hours or more. https://www.coherentmarketinsights.com/industry-reports/ambulatory-electrocardiography-market#:~:text=The%20ambulatory%20electrocardiography%20market%20is,8.3%25%20from%202024%20to%202031.