Table 6.
Comparison of MIMIC-II with other ICU databasesa
| MGH Waveform DB (24) |
SIMON (25) | IMPROVE/IBIS (26) |
Project IMPACT (2) |
eICU Research Institute (27) |
APACHE (1) | ICNARC (28) | Veteran’s Administration (29) |
MIMIC-I (30) | MIMIC-II | |
|---|---|---|---|---|---|---|---|---|---|---|
| Category of database | OR/cardiac procedures | Trauma ICU | ICU shock and neurologic monitoring) | MICU SICU Trauma CCU CSRU | Adult critical care | Medical and surgical ICU | Medical and surgical ICU | Medical and surgical ICU | MICU SICU CCU | MICU SICU CCU CSRU |
| Number of records | 100+ | 1000+ | 100+ | 100,000+ | 1,000,000+ | 110,558 | 900,000 | 110,000+ | 100+ | 10,000+ |
| Single-or multicentered | Single | Single | Single | Multiple | Multiple | Multiple | Multiple | Multiple | Single | Single |
| Source availability | Academic Free | Academic Restricted | Academic Fee-based | Private Fee-based | Private Restricted | Private Free | Academic Free | Government Free | Academic Free | Academic Free |
| Record length | <90 mins | Entire stay | 24 hrs | First 24 hrs | Entire stay | First 7 ICU days | First 24 hrs | Entire stay | Variable (24–48 hrs) | Entire stay |
| Physiological waveforms | Multichannel: ECG Hemodynamic respiratory |
No | Multichannel: ECG Hemodynamic respiratory EEG |
No | No | No | No | No | Multichannel: ECG Hemodynamic respiratory |
Multichannel: ECG Hemodynamic respiratory |
| Vital signs and numerics |
Monitor-generated (1-sec resolution) |
Monitor-generated (1-sec resolution) |
Monitor-generated (1-sec resolution) |
Nurse daily Abstraction |
Monitor-generated (5-min resolution) |
Nurse daily Abstraction |
Nurse daily Abstraction |
Nurse daily Abstraction |
Monitor-generated (1-sec resolution) |
Monitor-generated (1-sec and minute resolution) |
| Bedside alarms | Yes | No | Yes | No | No | No | No | No | Yes | Yes |
| Laboratory/clinical data | No | No | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes |
| Clinician notes | No | No | Yes | No | No | No | No | Yes | No | Yes |
| Therapy details | No | No | Yes | Yes | Yes | Daily Abstraction | Daily Abstraction | Detailed Abstraction | No | Yes |
| ICD-9 Codes/problem lists | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Mortality/outcomes data availability | No | No | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes |
MIMIC-II, Multiparameter Intelligent Monitoring in Intensive Care II; ICU, intensive care unit; ICD-9, International Classification of Diseases, 9th Revision; OR, operating room; ECG, electrocardiogram; MICU, medical ICU; SICU, surgical ICU; CCU, coronary care unit; CSRU, cardiac surgery recovery unit.
Category of database describes patient populations of each respective database. Number of records is number of records, based on published or private communication, to the nearest order of magnitude. Single- or multicentered databases are designated by the number of medical centers that contributed records. Ownership that controls access to a database is defined as either academic (university or professional society) or private (corporation). Availability is defined as “free” if potential users are not required to pay access fees and “fee-based” if access fees are required and is considered “restricted” if third-party researchers are generally not granted access to such a database. Record length is defined as the typical length of each ICU record contained in the database. Physiological waveforms describe the types of high-resolution waveform data available with each database, ie, ECG, hemodynamics (eg, pulsatile blood pressure waveforms), electroencephalogram, respiration. Vital signs and numerics recording resolution are described for each database, from second-to-second to daily abstraction (one set of vital signs per day). Clinician notes include one or more of the following: physician progress notes, nursing progress notes, and discharge summaries. Therapy details include daily medication lists, provider order entry records, or medication flow sheets.