Detect respiratory events (apneas and hypopneas)

Detects apneas and hypopneas in respiratory airflow and effort signals, returning event-level metadata and summary indices. Detection follows AASM 2012/2017 criteria: >= 90% signal reduction for >= 10 s (apnea), or >= 30% reduction with >= 3% SpO2 desaturation or arousal for >= 10 s (hypopnea).

Usage

detect_apneas(
  psg,
  airflow_channel = NULL,
  spo2_channel = NULL,
  min_duration_s = 10,
  apnea_threshold = 0.9,
  hypopnea_threshold = 0.3,
  desaturation_threshold = 3
)

Arguments

psg

An mrpheus_psg object from prepare_psg().

airflow_channel

Character. Airflow channel label (e.g. nasal pressure or thermistor). If NULL (default), the first RESP channel is used.

spo2_channel

Character or NULL. SpO2 channel for hypopnea scoring.

min_duration_s

Numeric. Minimum event duration in seconds. Default 10.

apnea_threshold

Numeric. Fractional reduction required for apnea classification. Default 0.90.

hypopnea_threshold

Numeric. Fractional reduction required for hypopnea classification. Default 0.30.

desaturation_threshold

Numeric. SpO2 drop (percentage points) required to confirm hypopnea. Default 3.

Value

A list with:

events

Tibble. One row per event: epoch, start_s, end_s, duration_s, type ("apnea" / "hypopnea"), desaturation.

summary

Tibble. n_apneas, n_hypopneas, n_events.

See also

compute_ahi(), compute_odi()