Coronary Artery Disease
1. INTRODUCTION
The National Heart, Lung, and Blood Institute states that “more than a million persons in the U.S. have a heart attack and about half (515,000) of them die in each year. About one-half of those who die do so within 1 hour of the start of symptoms and before reaching the hospital”. A heart attack happens to a person when the blood flow and oxygen supply to heart muscle is blocked, and it is mostly caused by the Coronary Artery Disease (CAD). CAD occurs when the arteries that supply blood to the heart muscle (coronary arteries) become hardened and narrowed. It often causes irregular heart beat or rhythm by blocking blood stream. The National Heart, Lung, and Blood Institute suggest that “everyone should know the warning signs of a heart attack and how to get emergency help”.
The symptoms of heart attack can be detected by observing electrocardiogram (ECG) waveform. An ECG is an electrical recording of the heart and is used in the …show more content…
Desiring ω1 to be 0.04 Hz and ω2 to be 150 Hz (7) and (8)
From eq. (6), it can be seen that the output is amplified by a gain equal to R11/R10. Since the gain is desired to be about 100, eqn. (7) and (8) can be solved. Thus R11 is selected to be 106.2 kΩ, R10 to be 1 kΩ, R8 to be 3.9 MΩ, C1 to be 1 μF and C2 to be 0.01 μF. The value of R9 is not significant and is selected to be 10 kΩ.
A buffer with unity gain is needed for each input as an impedance transformer, because the skin has much higher impedance compared to the input impedance of the differential amplifier. Figure 2.5 shows a diagram of the buffer components. Figure 2.2.4 Buffer Components Diagram
Since no current flows into the input terminals and v+ = v-, by applying KCL The gain is determined by R1/R2 = R3/R2. Desiring a gain of unity, R1, R2, R3, and R4 were chosen to be 10 kΩ each.
2.3 Data Transmission between Wrist and the Walking
The National Heart, Lung, and Blood Institute states that “more than a million persons in the U.S. have a heart attack and about half (515,000) of them die in each year. About one-half of those who die do so within 1 hour of the start of symptoms and before reaching the hospital”. A heart attack happens to a person when the blood flow and oxygen supply to heart muscle is blocked, and it is mostly caused by the Coronary Artery Disease (CAD). CAD occurs when the arteries that supply blood to the heart muscle (coronary arteries) become hardened and narrowed. It often causes irregular heart beat or rhythm by blocking blood stream. The National Heart, Lung, and Blood Institute suggest that “everyone should know the warning signs of a heart attack and how to get emergency help”.
The symptoms of heart attack can be detected by observing electrocardiogram (ECG) waveform. An ECG is an electrical recording of the heart and is used in the …show more content…
Desiring ω1 to be 0.04 Hz and ω2 to be 150 Hz (7) and (8)
From eq. (6), it can be seen that the output is amplified by a gain equal to R11/R10. Since the gain is desired to be about 100, eqn. (7) and (8) can be solved. Thus R11 is selected to be 106.2 kΩ, R10 to be 1 kΩ, R8 to be 3.9 MΩ, C1 to be 1 μF and C2 to be 0.01 μF. The value of R9 is not significant and is selected to be 10 kΩ.
A buffer with unity gain is needed for each input as an impedance transformer, because the skin has much higher impedance compared to the input impedance of the differential amplifier. Figure 2.5 shows a diagram of the buffer components. Figure 2.2.4 Buffer Components Diagram
Since no current flows into the input terminals and v+ = v-, by applying KCL The gain is determined by R1/R2 = R3/R2. Desiring a gain of unity, R1, R2, R3, and R4 were chosen to be 10 kΩ each.
2.3 Data Transmission between Wrist and the Walking