Telecardiology is a telemedicine service that can provide expert consultation and life-supporting treatment to patients independent of geographical location. The required technology has been available for many years, but the diffusion of telecardiology services is still limited. With the aging population of the industrial world and the increase of chronically ill patients, there is a need for telecardiology services. This paper presents a survey on how telecardiology services are being used today. The survey was conducted by reviewing articles published in recognized journals and conferences and categorizing them according to a telemedicine taxonomy, which was extended for telecardiology purposes. Based on the survey results, interoperability issues are discussed and also how standardization may change the pattern for use of telecardiology. Our principal results are that very few publications describe mobile telecardiology services that facilitate wireless communication. More research needs to be conducted on mobile telecardiology services and interoperability issues on information and communication levels must be worked out.