Childhood Adenotonsillectomy Trial
3.1.1 CHAT Standardized Recording Montage
- Sampling rates for signal collection are minimum rates and may be exceeded depending on rates offered by the acquisition system. Sampling rates should be the same among like channels (i.e. EEG, EMG, Respiratory).
- Signals were be collected unfiltered (at hardware settings). This may vary according to the acquisition system. 60 Hz filter may used during collection.
Table 1: CHAT Standardized Sensors and Placement
All gold disk scalp electrodes will be placed according to the International 10-20 System
| Electrodes For CHAT PSG | Placement Standard for CHAT PSG | Sensor Used for Signal |
|---|---|---|
| Reference Mid-forehead | (FPz) | Gold cup |
| Ground | Slightly posterior to Cz | Gold cup |
| E1 | 1 cm lateral + 1 cm below outer canthus L eye | Gold cup or Ag/AgCL patch |
| E2 | 1 cm lateral + 1 cm below outer canthus R eye | Gold cup or Ag/AgCL patch |
| F3 | Left frontal | Gold cup |
| F4 | Right frontal | Gold cup |
| C3 | Left central | Gold cup |
| C4 | Right central | Gold cup |
| T3 | Left temporal | Gold cup |
| T4 | Right temporal | Gold cup |
| O1 | Left occipital | Gold cup |
| O2 | Right occipital | Gold cup |
| M1 | Left mastoid process | Gold cup |
| M2 | Right mastoid process | Gold cup |
| LChin | Below chin, left of geniohyoid muscle | Gold cup or Ag/AgCL patch |
| RChin | Below chin, right of geniohyoid muscle | Gold cup or Ag/AgCL patch |
| CChin | Ledge of chin, on mentalis muscle | Gold cup or Ag/AgCL patch |
| ECG1 | Below right clavicle | Gold cup or Ag/AgCL patch |
| ECG2 | Below left clavicle | Gold cup or Ag/AgCL patch |
| ECG3 | Left lower rib | Gold cup or Ag/AgCL patch |
| RLeg1 | Right leg, belly of Tibilias Anterior muscle, 3 cm. apart | Gold cup or Ag/AgCL patch |
| RLeg2 | Right leg, belly of Tibilias Anterior muscle, 3 cm. apart | Gold cup or Ag/AgCL patch |
| LLeg1 | Left leg, belly of Tibilias Anterior muscle, 3 cm. apart | Gold cup or Ag/AgCL patch |
| LLeg2 | Left leg, belly of Tibilias Anterior muscle, 3 cm. apart | Gold cup or Ag/AgCL patch |
| Airflow (nasal/ oral) | Below nose, above upper lip | Dymedix airflow with RERA-quality cable |
| Nasal Pressure | Nasal Cannula at floor of nares | Salter or Protech Cannula (Dual-end for NP & CO2) |
| Chest | Upper chest, below armpit | Pro-Tech, Z-Rip system |
| Abdomen | Lower abdomen, on or slightly above umbilicus | Pro-Tech, Z-Rip system |
| Sum | Pro-Tech, Z-Rip system | |
| Oximetry (SpO2) Pleth wave form or other quality indicator | Non-index fingertip on non-dominant hand, Nonin XPod Model 3012 or comparable on-board with quality indicator (i.e.:Masimo) | Reusable or disposable Nonin Finger oximeter sensor Nonin 8000J or 8008J or other to interface correctly with on-board (dependent on finger size) |
| Snore Mic | This signal is not obligate for CHAT | Standard sensor, if used in clinical lab |
| Position | Middle of upper chest, may be on chest belt | The correct sensor for your PSG instrument |
| Capnography EtCO2 | Nasal Cannula at floor of nares | Numeric Display Salter or Protech Cannula (Dual-end for NP & CO2) |
| Signals (Type) to Collect | Name of signal | Minimum Sampling Rate (Hz) (may be exceeded) | Amplifier Peak-to-Peak (peak-peak must fit the expected size of signal) | Amplifier Polarity for Collection |
|---|---|---|---|---|
| Reference | REF | 200 | ||
| Ground | 200 | |||
| L eye movement | E1 | 200 | 1 MV to 6 MV | +↑ |
| R eye movement | E2 | 200 | 1 MV to 6 MV | +↑ |
| F3 | F3 | 200 | 1 MV to 6 MV | +↑ |
| F4 | F4 | 200 | 1 MV to 6 MV | +↑ |
| C3 | C3 | 200 | 1 MV to 6 MV | +↑ |
| C4 | C4 | 200 | 1 MV to 6 MV | +↑ |
| T3 | T3 | 200 | 1 MV to 6 MV | +↑ |
| T4 | T4 | 200 | 1 MV to 6 MV | +↑ |
| O1 | O1 | 200 | 1 MV to 6 MV | +↑ |
| O2 | O2 | 200 | 1 MV to 6 MV | +↑ |
| M1 | M1 | 200 | 1 MV to 6 MV | +↑ |
| M2 | M2 | 200 | 1 MV to 6 MV | +↑ |
| L Chin EMG | Lchin | 200 | 1 MV to 6 MV | +↑ |
| R Chin EMG | Rchin | 200 | 1 MV to 6 MV | +↑ |
| C Chin EMG | Cchin | 200 | 1 MV to 6 MV | +↑ |
| ECG1 | ECG1 | 200 | 1 MV to 6 MV | +↑ |
| ECG2 | ECG2 | 200 | 1 MV to 6 MV | +↑ |
| ECG3 | ECG3 | 200 | 1 MV to 6 MV | +↑ |
| RLeg1 EMG | RLeg1 | 200 | 6 MV to 20 MV | +↑ |
| RLeg2 EMG | RLeg2 | 200 | 6 MV to 20 MV | +↑ |
| LLeg1 EMG | LLeg1 | 200 | 6 MV to 20 MV | +↑ |
| LLeg2 EMG | LLeg2 | 200 | 6 MV to 20 MV | +↑ |
| Nasal/Oral Airflow | Airflow | 32 | 40 uV to 2 MV | +↑ |
| Nasal Pressure | CannulaFlow | 128 | 20 uV to 2 MV | +↑ |
| Thoracic IP | Chest | 32 | 20 uV to 10 MV | +↑ |
| Abdominal IP | ABD | 32 | 20 uV to 10 MV | +↑ |
| IP Sum | SUM | 32 | 20 uV to 10 MV | +↑ |
| Oximetry (SpO2) Plethysomnography wave form | SAO2 Pleth (or other quality indicator) | 10 or highest allowable rate | Set (0 to 1 V) | |
| Position | Position | 1.0-10 | Set (500 MV to5V) | |
| Capnography waveform numerical | EtCO2-W | 32 | Set (0 to 1 V) | |
| Capnography waveform numerical | EtCO2# | 15 | Set (0 to 1 V) | |
| The following signal is not obligate for CHAT. Collect if done clinically. | ||||
| Snore Mic | Snore | 200 | 24 uV to 1 MV | +↑ |
National Sleep Research Resource
Childhood Adenotonsillectomy Trial