Waveform Conversion - chorus-ai/chorus_waveform_conversion GitHub Wiki
This wiki provides content related to converting waveform data. The CHoRUS waveform data will be provided in WFDB format.
The signal labels used in the waveform header files need to use standardized names for the signal labels. These standardized names come from the ISO/IEEE 11073 standards. More specifically, the signal labels listed below come from 11073-10101-2020 - ISO/IEEE International Standard - Health informatics-Device interoperability-Part 10101: Point-of-care medical device communication-Nomenclature.
As outlined in the SOP on contributing waveforms, we are requesting a number of different types of telemetry signals. The complete list of high-frequency and low-frequency ("numeric") signals being requested, along with the standardized signal labels are provided in these tables.
| Signal Name | Signal Label | Additional Details | Minimum Sample Rate (Hz) | Required Signal Resolution |
|---|---|---|---|---|
| Electrocardiogram lead I | MDC_ECG_LEAD_I | Electrical activity from the right arm (-) to the left arm (+), providing a lateral view of the heart | 125* | ≤ 20 µV |
| Electrocardiogram lead II | MDC_ECG_LEAD_II | Electrical activity from the right arm (-) to the left leg (+), providing an inferior view of the heart | 125* | ≤ 20 µV |
| Electrocardiogram lead III | MDC_ECG_LEAD_III | Electrical activity from the left arm (-) to the left leg (+), providing an inferior view of the heart | 125* | ≤ 20 µV |
| Electrocardiogram lead aVR | MDC_ECG_LEAD_AVR | Electrical activity directed towards the right arm | 125* | ≤ 20 µV |
| Electrocardiogram lead aVL | MDC_ECG_LEAD_AVL | Electrical activity directed towards the left arm | 125* | ≤ 20 µV |
| Electrocardiogram lead aVF | MDC_ECG_LEAD_AVF | Electrical activity directed towards the left leg | 125* | ≤ 20 µV |
| Electrocardiogram lead V1 | MDC_ECG_LEAD_V1 | Placed at the 4th intercostal space, right of the sternum, providing a view of right ventricular activity | 125* | ≤ 20 µV |
| Electrocardiogram lead V2 | MDC_ECG_LEAD_V2 | Placed at the 4th intercostal space, left of the sternum, providing a view of right ventricular and septal activity | 125* | ≤ 20 µV |
| Electrocardiogram lead V3 | MDC_ECG_LEAD_V3 | Placed between V2 and V4, providing a transition between septal and anterior views | 125* | ≤ 20 µV |
| Electrocardiogram lead V4 | MDC_ECG_LEAD_V4 | Placed at the 5th intercostal space, midclavicular line, providing a view of anterior left ventricular activity | 125* | ≤ 20 µV |
| Electrocardiogram lead V5 | MDC_ECG_LEAD_V5 | Placed at the same horizontal level as V4, at the anterior axillary line, providing a view of lateral left ventricular activity | 125* | ≤ 20 µV |
| Electrocardiogram lead V6 | MDC_ECG_LEAD_V6 | Placed at the same horizontal level as V4, at the midaxillary line, providing a view of lateral left ventricular activity | 125* | ≤ 20 µV |
| Electrocardiogram lead V7 | MDC_ECG_LEAD_V7 | Placed at the same horizontal level as V6, at the posterior axillary line, used for detecting posterior infarctions | 125* | ≤ 20 µV |
| Electrocardiogram lead V8 | MDC_ECG_LEAD_V8 | Placed at the same horizontal level as V6, at the midscapular line, providing a more posterior view | 125* | ≤ 20 µV |
| Electrocardiogram lead V9 | MDC_ECG_LEAD_V9 | Placed at the same horizontal level as V6, at the paraspinal line, offering a view of posterior left ventricular activity | 125* | ≤ 20 µV |
| Electrocardiogram lead MCL1 | MDC_ECG_LEAD_MCL1 | A modified lead that approximates V1, used in 3-lead and 5-lead monitoring for detecting ventricular arrhythmias and bundle branch blocks | 125* | ≤ 20 µV |
| Electrocardiogram lead MCL6 | MDC_ECG_LEAD_MCL6 | A modified lead that approximates V6, used for lateral wall monitoring in continuous telemetry settings | 125* | ≤ 20 µV |
| Photoplethysmogram (PPG) | MDC_PLETH | Blood plethysmography | 50 | ≤ 0.01 a.u. |
| Respiration | MDC_RESP | Breathing; method not specified | 25 | ≤ 0.1 a.u. |
| Transthorasic impedance | MDC_IMPED_TTHOR | Transthoracic measurement of electrical impedance | 50 | ≤ 0.05 ohm |
| Arterial blood pressure (ABP) | MDC_PRESS_BLD_ART | Pressure of the blood in an artery | 125 | ≤ 1 mmHg |
| Central venous pressure (CVP) | MDC_PRESS_BLD_VEN_CENT | Pressure of the blood in the thoracic venae cavae | 62 | ≤ 1 mmHg |
| Pulmonary artery pressure (PAP) | MDC_PRESS_BLD_ART_PULM | Pressure of the blood in the pulmonary artery | 62 | ≤ 1 mmHg |
| Intracranial pressure (ICP) | MDC_PRESS_INTRA_CRAN | Pressure inside skull | 62 | ≤ 0.5 mmHg |
| Ventricular pressure (ICPV) | MDC_PRESS_INTRA_CRAN_VENT | Pressure inside skull inside ventricle | 62 | ≤ 0.5 mmHg |
| Airway flow (AWF) | MDC_FLOW_AWAY | Gas flow in airway | 62 | ≤ 0.01 L/s |
| Airway pressure (AWP) | MDC_PRESS_AWAY | Pressure of gas in airway | 62 | ≤ 0.5 cmH₂O |
| Airway volume (AWV) | MDC_VOL_AWAY_TIDAL | Volume of gas leaving the patient through the patient connection port during an expiratory phase | 25 | ≤ 1 mL |
| Capnogram (CO2) | MDC_CO2_RESP | Breathing; method: carbon dioxide measurement | 25 | ≤ 0.1% CO₂ |
- For neonatal ECG, a minimum sampling rate of 250 Hz is recommended to preserve waveform fidelity.
| Signal Name | Signal Label | Additional Details |
|---|---|---|
| Heart rate (HR) | MDC_ECG_HEART_RATE | Rate of cardiac beats |
| QT interval | MDC_ECG_TIME_PD_QT_GL | Duration of the interval between the QRS onset and T wave offset of ECG (global) |
| ST elevation / depression | MDC_ECG_AMPL_ST | Amplitude of the ST segment at xx ms after the end of QRS complex of ECG in specified |
| Respiratory rate (RR) | MDC_RESP_RATE | Rate of breathing; method not specified |
| Oxygen saturation (SpO2) | MDC_SAT_O2 | Peripheral oxygen saturation |
| Perfusion index | MDC_BLD_PERF_INDEX | Tissue perfusion computed as milliliters per minute of blood flow per gram of tissue |
| Pulse rate (from PPG or BP) | MDC_PULS_RATE | Rate of blood pulse in an artery |
| Mean arterial blood pressure (ABPm) | MDC_PRESS_BLD_ART_MEAN | Mean pressure of the blood in an artery |
| Systolic arterial blood pressure (ABPs) | MDC_PRESS_BLD_ART_SYS | Systolic pressure of the blood in an artery |
| Diastolic arterial blood pressure (ABPd) | MDC_PRESS_BLD_ART_DIA | Diastolic pressure of the blood in an artery |
| Mean noninvasive blood pressure (NBPm) | MDC_PRESS_BLD_NONINV_MEAN | Pressure of the blood, obtained noninvasively (i.e., fingertip), as computed by averaging on one cycle |
| Systolic noninvasive blood pressure (NBPs) | MDC_PRESS_BLD_NONINV_SYS | Pressure of the blood, obtained noninvasively (i.e., fingertip), at the systolic phase |
| Diastolic noninvasive blood pressure (NBPd) | MDC_PRESS_BLD_NONINV_DIA | Pressure of the blood, obtained noninvasively (i.e., fingertip), at the diastolic phase |
| End tidal CO2 | MDC_CONC_AWAY_CO2_ET | Partial pressure of carbon dioxide in airway gas measured at the end of expiration. |
| Cerebral oxygen saturation (rSO2) | MDC_SAT_O2_CEREB | Regional oxygen saturation |
As outlined in the SOP on contributing waveforms, we are requesting EEG signals. This table provides standardized signal labels for the signals from the 10-20 EEG standard. The EEG signals should be sampled at 128Hz or higher and the resolution should be 1uV or smaller.
| Signal Name | Signal Label | Additional Details |
|---|---|---|
| EEG Frontal Pole Left (Fp1) | MDC_HEAD_FRONT_POLAR_L | Frontopolar (theta 90, phi 108) |
| EEG Frontal Pole Right (Fp2) | MDC_HEAD_FRONT_POLAR_R | Frontopolar (theta 90, phi 72) |
| EEG Frontal Left (F3) | MDC_HEAD_FRONT_L_3 | Frontal (theta 64, phi 129.1) |
| EEG Frontal Right (F4) | MDC_HEAD_FRONT_R_4 | Frontal (theta 64, phi 50.9) |
| EEG Central Midline (Fz) | MDC_HEAD_FRONT_MID | Frontal (theta 45, phi 90) |
| EEG Frontal Left Outer (F7) | MDC_HEAD_FRONT_L_7 | Frontal (theta 90, phi 144) |
| EEG Frontal Right Outer (F8) | MDC_HEAD_FRONT_R_8 | Frontal (theta 90, phi 36) |
| EEG Central Left (C3) | MDC_HEAD_CENT_L_3 | Central (theta 45, phi 180) |
| EEG Central Right (C4) | MDC_HEAD_CENT_R_4 | Central (theta 45, phi 0) |
| EEG Central Midline (Cz) | MDC_HEAD_CENT_MID | Central (theta 0, phi 0) |
| EEG Parietal Left (P3) | MDC_HEAD_PARIET_L_3 | Parietal (theta 64, phi 230.9) |
| EEG Parietal Right (P4) | MDC_HEAD_PARIET_R_4 | Parietal (theta 64, phi 309.1) |
| EEG Central Midline (Pz) | MDC_HEAD_PARIET_MID | Parietal (theta 45, phi 270) |
| EEG Occipital Left (O1) | MDC_HEAD_OCCIP_L | Occipital (theta 90, phi 252) |
| EEG Occipital Right (O2) | MDC_HEAD_OCCIP_R | Occipital (theta 90, phi 288) |
| EEG Temporal Left (T3) | MDC_HEAD_TEMPOR_L_3 | Temporal (theta 90, phi 180) |
| EEG Temporal Right (T4) | MDC_HEAD_TEMPOR_R_4 | Temporal (theta 90, phi 0) |
| EEG Temporal Left Outer (T5) | MDC_HEAD_TEMPOR_L_5 | Temporal (theta 90, phi 216) |
| EEG Temporal Right Outer (T6) | MDC_HEAD_TEMPOR_R_6 | Temporal (theta 90, phi 324) |
| EEG Mastoid Left (A1) | MDC_HEAD_AURIC_L | Left ear (theta 120, phi 180) |
| EEG Mastoid Right (A2) | MDC_HEAD_AURIC_R | Right ear (theta 120, phi 0) |