Peripheral Pressure Impulse Lab Report
Engr 4132
Biomedical Engineering Lab
Dr. Gang Xu
Lab #9: ECG & Pulse
Mechanical Action of the Heart
Peripheral Pressure Pulse
Plethysmography
By: Abigail Magee
Partners: Lauren Tinnin Nick Walker
Date: 11/05/2015
Introduction: The heart goes through a cardiac cycle in order to pump blood throughout the body. This cycle is started by electrical activity that can be measured by an electrocardiogram. As the heart contracts, it pumps blood into the next section of the cardiac system. The electrical activity of the ventricles is shown as the QRS complex in an electrocardiogram. This electrical signal occurs before the mechanical action of the ventricles contracting (called ventricular systole). This systole begins at the peak of the R wave and ends at the end of the T wave. Repolarization of the ventricles is demonstrated by …show more content…
The values are similar because the heart did not have to pump much harder for the other conditions (hand in cold water, hand in air) to affect the heart rate or pulse much.
i. The QRS complex amplitude increases as the pulse amplitude increases. This is due to the fact that both the QRS complex and the pulse correspond to the systole (QRS) and diastole (pulse) of the heart so if one increases/decreases the other will increase/decrease correspondingly.
i. Vasodilation and vasoconstriction cause a change in blood volume to the fingertip. If vasoconstriction is occurring, less blood is going to be in the fingertip at one time. When vasodilation is occurring, the opposite occurs, the blood volume would increase. This is due to the dilation of blood vessels and increasing the amount of blood that can pass through the vessel at that time.
i. The difference in speed can be explained by gravity. Because the hand was being held upright in segment three, it takes the blood longer to get to the finger because it has to work against gravity.
i. Arterial and ventricular diastoles are discernible in pulse
Biomedical Engineering Lab
Dr. Gang Xu
Lab #9: ECG & Pulse
Mechanical Action of the Heart
Peripheral Pressure Pulse
Plethysmography
By: Abigail Magee
Partners: Lauren Tinnin Nick Walker
Date: 11/05/2015
Introduction: The heart goes through a cardiac cycle in order to pump blood throughout the body. This cycle is started by electrical activity that can be measured by an electrocardiogram. As the heart contracts, it pumps blood into the next section of the cardiac system. The electrical activity of the ventricles is shown as the QRS complex in an electrocardiogram. This electrical signal occurs before the mechanical action of the ventricles contracting (called ventricular systole). This systole begins at the peak of the R wave and ends at the end of the T wave. Repolarization of the ventricles is demonstrated by …show more content…
The values are similar because the heart did not have to pump much harder for the other conditions (hand in cold water, hand in air) to affect the heart rate or pulse much.
i. The QRS complex amplitude increases as the pulse amplitude increases. This is due to the fact that both the QRS complex and the pulse correspond to the systole (QRS) and diastole (pulse) of the heart so if one increases/decreases the other will increase/decrease correspondingly.
i. Vasodilation and vasoconstriction cause a change in blood volume to the fingertip. If vasoconstriction is occurring, less blood is going to be in the fingertip at one time. When vasodilation is occurring, the opposite occurs, the blood volume would increase. This is due to the dilation of blood vessels and increasing the amount of blood that can pass through the vessel at that time.
i. The difference in speed can be explained by gravity. Because the hand was being held upright in segment three, it takes the blood longer to get to the finger because it has to work against gravity.
i. Arterial and ventricular diastoles are discernible in pulse