When difficulties occur during anesthesia and the management of intensive care patients, there may not be sufficient time for frequent, accurate and detailed recordings which are essential for medico-legal purposes and the retrieval of information. However, it is during such occasions that the collection of an accurate, detailed record may be nearly impossible. A system, bases on the 16bits microcomputer linked to a Datascope 2000, has been developed to collect cardiovascular data on line from a cardiovascular monitor. The computer can be operated by using the main anesthetic record program written in a C language which enables the interrupt facility in the microcomputer and interface card to detect and store data transmitted from the Datascope. Patient's details are entered by manipulating function keys on the keybord. All information is stored on a disc for subsequent analysis. A formed graph and text can be displayed on the screen. The graph and all the information entered can be printed out at the end of the operation to form a complete anesthetic record.