These artefacts have to be removed before the signal is used for next data processing like heart rate frequency determination.Īlgorithms compute heart rate frequency from the signal energy. The main noise elements are power supply network 50 Hz frequency and breathing muscle movements. The signal was used as an input signal for the digital filters and the heart rate detection algorithms designing and testing.ġ4 ECG Digital Filters Noise elements filtering and baseline wander elimination with digital filters. Analog signal pre-processing was done on simple amplifier circuit designated for ECG signal measurement. The T wave reflects the phase of rapid repolarization of the ventricles.ġ2 Signal Acquisition ECG signal for digital signal processing and heart rate calculation acquired by measurement card with sampling frequency fs = 500 Hz. The QRS complex represents ventricular depolarization. The P wave represents atrial depolarization. a P wave, - a QRS complex, and - a T wave. Positive in I and negative in II = LAD Negative in I and positive in II = RAD bradycardic - tachycardic Rhythm - are there P waves? - are they regular? - does one precede every QRS Complex? - regular vs irregular Axis Ateġ0 Axis ? Positive in I and II = NORMAL Calibration: - speed: 25 mm/second - height: 1cm/mVĩ Rate, Rhythm, Axis Rate is either - normal Rhythm Is there any interference Is there electrical activity from all 12 leads. T wave QT intervalĨ Quality of the ECG Patient Name Date of the ECG Quality of ECG? Rate Rhythm Axis P wave PR interval QRS interval QRS morphology Abnormal Q waves ST segment. indicated by the patients findings - cardiac murmur. Indicated by the patients symptoms - symptoms of IMD/MI. If the pulse travels away from the positive electrode this results in a negative deflection.Ħ Why perform an ECG? It’s part of the admission bundle. If the electrical impulse travels toward the positive electrode this results in a positive deflection. The voltage change sensed by measuring the ?current? change across two electrodes – a positive electrode and a negative electrode. Disconnect if adequate and remove electrodes.ĥ How does ECG work? Electrical Pulses picked up by the placing electrodes on patient. Label the tracing - Name, DoB, hospital number, date and time. Turn on machine - calibrate to 10 mm/mV, rate at 25 mm/s. GRIP – Greet, report, identify, introduce, procedure, privacy, permission. An ECG is used to measure - the rate and regularityof heartbeats as well as - the size and position of the chambers, - the presence of any damage to the heart and - the effects of the drugs or devices used to regulate the heart. How does the ECG work? Why perform an ECG? Interpretation of the ECG Quality of the ECG Rate, Rhythm, Axis ECG wave Signal Acquisition Algorithms for ECG Signal Processing ?Simple physiology? ECG Digital Filters ECG baseline wander Heart Rate Data Algorithm Autocorrelation function of energy signal Threshold of energy signal Application of designed algorithm Results Further workģ What is an ECG? Electrocardiography (ECG) is a transthoracic interpretation of the electrical activity of the heart over a period of time, as detected by electrodes attached to the surface of the skin and recorded by a device external to the body. M.Sc Communicative Electronics IEM3220 Physiology and Engineering May 3, 2013Ģ Overview What is an ECG? Overview of the ECG procedure 1 ECG Signal Processing Ojasvi Verma 121852
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