Table 2 Summary of terms and indices computed.
From: Cardiopulmonary coupling indices to assess weaning readiness from mechanical ventilation
F\(_r\) | Respiratory Frequency | |
HR | Heart Rate | |
HRV | Heart Rate Variability | |
SDNN | Standard Deviation of Normal-to-Normal intervals | |
RMSSD | Root-Mean Square of Successive intervals Differences | |
\({\text{ P }}_{{\rm VLF}}\) | Power in the VLF band | |
\({\text{ P }}_{{\rm HF}}\) | Power in the modified HF band, centred to respiration | |
\({\text{ P }}_{{\rm LF}}^n\) | Normalized Power \({\text{ P }}_{{\rm LF}}\)/(\({\text{ P }}_{{\rm LF}}\)+\({\text{ P }}_{{\rm HF}}\)), with \({\text{ P }}_{{\rm HF}}\) centred to respiration | |
CPC | Cardio-Pulmonary Coupling | Framework |
\(\mathscr {C}^{\mathcal {T}}_{{\rm HF}}\) | Amount of spectral coherence between HRV and respiration, averaged in time where coherence is significant | TFC Time-Frequency Coherence |
\(\mathscr {CE}_{{\rm r} \leftrightarrow {\mathrm{m}}}\) | Cross entropy, amount of information shared between HRV and respiration | ID Information Dynamics |
\({\mathscr {P}}_{{\rm m}_{{\rm r}}}\) | Relative power of the respiratory component embedded in HRV | OSP Orthogonal Subspace Projections |
