Bayuh Asmamaw Hailu
Trend and principal components of HIV/AIDS among adults in SSA
Scientific reports
airflow fluctuations caused cardiac contraction trigger inappropriate ventilator pressure support anesthesia machines intensive care unit mechanical ventilators removal cardiogenic artifact airflow signal would improve ventilator function application singular spectrum analysis ssa remove cardiogenic oscillations ventilator airflow signals recorded intubated mechanically ventilated patients general anesthesia evaluated study airflow litersminute co2 mmhg data collected sampling rate 125 hz intraoperative monitoring systems using specialpurpose software simultaneous electrocardiogram signals mv also collected sampling rate 250 hz onedimensional ssa performed offline normalized airflow signals using window length sufficient span one period typical respiratory variation main components airflow waveform respiratory excursions cardiogenic oscillations respiratory excursions slowly varying higher magnitude smooth respiratory waveform formed elementary reconstructed series corresponding highest singular values obtained ssa analysis quality respiratory waveform extraction ssa determined calculating weighted correlation selected elementary reconstructed series airflow data recorded 6 patients respiratory component airflow signal without cardiogenic oscillations reconstructed elementary series corresponding singular values highest magnitude weighted correlations obtained greater 096 majority patients studied cardiogenic oscillations reconstructed elementary reconstructed series corresponding singular values lower magnitude ssa effective extracting higher amplitude respiratory excursions excluding lower amplitude cardiogenic oscillations noise airflow signal study demonstrates suppression cardiogenic artefact ssa computationally feasible augment ventilator performance