To freely access MIMIC-II, any interested researcher simply needs to follow a data use agreement and training for human subjects. Real access is on the Internet. Clinical data can be accessed either by downloading a flatfile text version or by logging in live via a password-protected web service. The best way to access physiological waveforms is WFDB software. Detailed information on access to MIMIC-II is available on the mimic II: physionet.org/mimic2 website. The data available in the MIMIC III database range from physiological measurements on the hospital bed, verified by nurses, to free-text interpretations of imaging studies provided by the Department of Radiology. Table 3 provides an overview of the different classes of data available. Figure 2 shows sampling data for an individual stay in an intensive care medical unit. The patient who underwent chemotherapy at the time of taking chemotherapy showed febrile neutropenia, anemia and thrombocytopenia.
Intensive mimic-II data were collected between 2001 and 2008 at Beth Israel Deaconess Medical Center (BIDMC) in Boston, Ma, USA. Adult data were collected by four intensive care units at BIDMC: Medical (MICU), Surgery (SICU), Coronary Unit (CCU) and Cardiac Surgery Recovery Unit (CSRU). Mimic-II also contains data from BIDMC`s Neonatal Intensive Care Unit (NICU), but this document focuses only on adult data, which account for the majority of MIMIC-II. This study was approved by the institutional evaluation boards of the BIDMC and the Massachusetts Institute of Technology. Authorization requires at least one week. Once a request has been accepted, the researcher receives emails with instructions on how to download the PhysioNetWorks database, a component that is restricted by PhysioNet9. This research and development received niH-R01-EB017205, NIH-R01-EB001659 and NIH-R01-GM104987 financial support from the National Institutes of Health. The authors also thank Philips Healthcare and staff at Beth Israel Deaconess Medical Center, Boston, for their assistance in developing the database and Ken Pierce for making Figure 1 available. Johnson, A., Pollard, T., Shen, L. et al. MIMIC-III, an intensive open access database. Sci Data 3, 160035 (2016).
doi.org/10.1038/sdata.2016.35 researchers wishing to use the database must formally request access through the following steps. Physiological waveforms have been converted from proprietary philips format to an open source format (WFDB)  to be saved separately from clinical data. Since clinical and physiological data came from different sources, they needed to be coordinated by confirming a common source of patients . Although clear identifiers such as medical record number and patient name were used for this matching task, much of the physiological waveforms lacked such an identifier, which led to a limited comparison. In addition, due to technical problems, the collection of wave shape data was shorter than clinical data collection and wave shape data was not even recorded for many intensive stays. Overall, five tables are used to define and track patient stays: ADMISSIONS; PATIENTS; ICUSTAYS; SERVICES; AND TRANSFERS. Five other tables are the dictionaries of cross-references to the codes with their respective definitions: D_CPT; D_ICD_DIAGNOSES D_ICD_PROCEDURES D_ITEMS and D_LABITEMS. Other tables include data associated with patient care, for example.B physiological measurements, caregiver observations, and billing information. The diversity of data types in MIMIC-II opens doors to a large number of research studies….