Related Experiment Videos
Apnea monitoring by acoustic detection of airflow
Insights
A novel acoustic monitor effectively detects infant apnea by sensing breath sounds, outperforming impedance and ECG methods. This technology identifies apnea events earlier, before heart rate changes, offering improved infant monitoring.
Area of Science:
- Neonatal Medicine
- Biomedical Engineering
- Respiratory Physiology
Background:
- Apnea, particularly in premature infants, poses significant risks.
- Current monitoring methods like impedance and ECG have limitations in early detection.
- Accurate and timely apnea detection is crucial for preventing adverse outcomes.
Purpose of the Study:
- To develop and evaluate an acoustic monitor for detecting infant apnea.
- To compare the efficacy of the acoustic monitor against traditional methods (observation, impedance, ECG).
- To assess the acoustic monitor's ability to detect apnea before bradycardia.
Main Methods:
- An acoustic monitor recording nasal breath sounds was developed.
- Recordings were obtained from eight premature infants.
- Data were compared with simultaneous observations, transthoracic impedance, and ECG monitoring.
Main Results:
- The acoustic monitor detected 26 apnea episodes (≥15 seconds), confirmed by observation and heart rate criteria.
- Only 7 episodes were detected by the impedance monitor.
- ECG monitoring alarmed after bradycardia onset, significantly later than acoustic detection.
Conclusions:
- The acoustic monitor accurately detects apnea by sensing absent airflow.
- It identifies central or obstructive apnea episodes earlier than bradycardia.
- The device is insensitive to body movements, offering an improved infant apnea monitoring technique.
Abstract:
An acoustic monitor to detect apnea in infants has been developed. Recordings of a signal derived from breath sounds at the nose were made in eight premature infants and compared with observation of the infant and with transthoracic impedance and ECG monitoring. The acoustic monitor detected 26 episodes of apnea lasting 15 seconds or longer which were confirmed by observation and by heart rate slowing of at least 20 beats per minute. Only seven of these episodes were detected by the impedance monitor. The ECG monitor alarmed during the nine spells in which heart rate dropped below 100 beats per minute, 27.5 +/- 9.7 seconds after breath sounds ceased. Inasmuch as the acoustic device detects absent airflow during central or obstructive apnea before bradycardia occurs and is insensitive to body movements, it represents an improved monitoring technique for infants with apnea.