The authors begin this essay with these remarks: "There’s a phrase in X̱aayda Kil, the Skidegate dialect of Haida language, that describes horizon when you can’t tell where ocean ends and sky begins: 'Ḵuuya ḵaagan ad siigaay G̱ud gii ts’ahlsgiidan Sky sea glued together.' Which is to say distinction between even most immutable boundaries can be blurred. As we approach tipping point catastrophic c...

Heart failure and Atrial Fibrillation (AF) commonly occur concomitantly, resulting in significant morbidity mortality. Thus, monitoring of heart status is essential directing medical therapy these patients. Left ventricular (LV) filling pressures are one the most important parameters assessing worsened or acutely decompensated left failure, however current LV pressure strategies include invasiv...

This paper provides a validation approach for a microwave Doppler Radar system used for heartbeat detection. The proposed system is tested at 16 GHz with several transmitted power, simultaneously with a pc-based electrocardiogram. Obtained results show accurate detection for the heartbeat signal in terms of heartbeat rate and heart rate variability.

We investigated to what extent maximal ventricular elastance (E(max)) is dynamically controlled by the arterial baroreflex and force-frequency relation in conscious dogs and to what extent these mechanisms are attenuated after the induction of heart failure (HF). We mathematically analyzed spontaneous beat-to-beat hemodynamic variability. First, we estimated E(max) for each beat during a baseli...

BACKGROUND Atrial fibrillation (AF) is the most common clinically significant cardiac arrhythmia. However, diagnosis of intraventricular dyssynchrony in patients with AF is difficult due to beat-to-beat variation. Additionally, evaluation of mechanical dyssynchrony in the traditional method is based on average of 5 to 10 beats, which is exhausting and time consuming. Single-beat evaluation of a...

The heart-beat classification in Holter ECG processors can be succesfully done by comparing the shape coefficients of the around-QRS fragments instead of comparing the signals themselfs. The additional computation time is compensated during the classification procedure, since up to 10 coefficients are stored for each class and compared instead of 30 signal samples (for 3-channels, 128 Hz-sample...