Design of Cardiac Monitor for Multi Parameters

A patient with heart disease need care and monitor intensively. In the monitoring of the heart, there are several parameters including the electrocardiograph (ECG) which to record the electrical activity of the heart, phonocardiograph (PCG) which to record heart sound, and carotid pulse (CP) which to record carotid arterial blood pressure. The purpose of this study is to design ECG, PCG, and CP on a computer with Delphi programming and analysis the relationship among those signal. The primary circuit of the cardiac monitor consists of the instrumentation amplifier, inverting amplifier, high pass filter, low pass filter, notch filter, non-inverting amplifier, summing amplifier, and Arduino microcontroller. This study involved fifteen healthy respondents. The design of a cardiac monitor was calibrated using the conventional apparatus. After the calculation, the statistics showed that the average error of BPM is 2.42718%. Carotid pulse showed that the correlation between the pattern of the dicrotic notch (the D wave) in the carotid pulse and second heart sound (S2) was occurred simultaneously or just before the D wave pulse from the carotid pulse. We found that the average of the interval between S2 and Dicrotic Notch was ± 0.036 s.