ECG T-wave amplitude, muscle tension, and heart rate concomitants of conditioned suppression

Ambulatory measurement of the ECG T-wave amplitude.

Ambulatory recording of the preejection period (PEP) can be used to measure changes in cardiac sympathetic nervous system (SNS) activity under naturalistic conditions. Here, we test the ECG T-wave amplitude (TWA) as an alternative measure, using 24-h ambulatory monitoring of PEP and TWA in a sample of 564 healthy adults. The TWA showed a decrease in response to mental stress and a monotonic dec...

T-wave amplitude changes.

Scenario: This electrocardiographic (ECG) rhythm strip was obtained from a 74-year-old man who arrived at the emergency department (ED) with expressive aphasia and right-sided weakness. Consistent with a transient ischemic attack (TIA), his symptoms lasted 30 minutes and had resolved just prior to hospital arrival. He had experienced similar episodes in the past month. A recent ultrasound estim...

A Simple FPGA Based ECG R Wave Peak Detection System For Heart Rate And Heart Rate Variability Calculation

A simple and reliable Field Programmable Gate Array (FPGA) based ECG Analysis system is discussed in this paper. An R peak detection system is modeled that identifies the time instances at which the R peak occurred. The system first calculates the threshold value for the next peak detection cycle, by looking at the previous peak. The hardware design has accuracy in excess of 99% in detecting th...

Beyond heart rate in the cardiac psychophysiological assessment of mental effort: the T-wave amplitude component of the electrocardiogram.

Macroscopic Visualization of the Heart Electrical Activity Via an Algebraic Computer Model

In this study, a mathematical model is developed based on algebraic equations which is capable of generating artificially normal events of electrocardiogram (ECG) signals such as P-wave, QRS complex, and T-wave. This model can also be implemented for the simulation of abnormal phenomena of electrocardiographic signals such as ST-segment episodes (i.e. depression, elevation, and sloped ascending...