The Death Defying Dunk '

Resting heart contractions were recorded for thirty seconds until the heart rate was less than 60 beats per minute. A stimulator electrode to be used was set to the following states: Amplitude of 4.00 Volts, a stimulus delay of 50ms, stimulus duration of 10ms, a frequency of 1.0Hz, and a pulse number of 30. The electrode was then placed in direct contact with the heart for 30 seconds at which time the data was observed and recorded.

At the latter end of the p-q interval, atrial contraction occurs forcing additional blood into the ventricles. At the beginning of the QRS interval on an ECG reading, the mitral valve closes and the ventricles are at EDV (135ml). During the QRS interval, ventricular contraction occurs increasing the pressure in the ventricle and the aorta. When the pressure continues in the ventricle exceeds the pressure in the arteries, the aortic valve opens and blood is ejected. The increased pressure continues through the t peak. The ventricles are now in ESV (65ml) and the aortic valve is closed. Now the ventricles are relaxed causing pressure to fall and the cardiac cycle starts over again. This ECG reading was from a normal tracing. Keep in mind that an ECV is easy to obtain, but there are some subtleties that are very complex.

4. Atrial hypertrophy would probably have what effect on an electrocardiogram? *spike the p wave

The authors then share their analysis on the changes of heart rate and GSR at the many different points throughout their study.

Table 2. This table shows the recording of the amplitude, period, and BPMs for the ventricular contractions before and the effects of the Warm Ringer’s after.

When I did my own EKG lab testing I used the following materials: BIOPAC electrode lead set (SS2L), BIOPAC disposable vinyl electrodes (EL503), Cot, BIOPAC electrodes, Computer Sytem, BIOPAC Student Lab software v3.0 or greater, and BIOPAC acquisition unit (MP30). When all these materials are available the computer was turned on and three of the electrodes were placed on the body of my teammate. Two electrodes were positioned on the medial surface of each leg just above the ankle, and the last electrode was on the right anterior forearm at her wrist. When these were attached the subject was asked to lie down on the cot and relax. We then attached her to the EKG machine with three colored cables. The white cable was placed on the electrode on the right forearm, the black cable was placed on right leg and the red cable was attached to the electrode on the left leg.

In normal heart activity, the ventricles are depolarized by the depolarization wave spreading from the atria.

The atrial contraction is represented by the P wave. This is an upward, or positive wave of the line on the graph. The ventricular contraction is displayed by the QRS complex. The QRS

The S-A node signal is delayed by the atrioventricular node to allow the full contraction of the atria that allows the ventricles to reach their maximum volume. A sweeping right to left wave of ventricular contraction then pumps blood into the pulmonary and systemic circulatory systems. The semilunar valves that separate the right ventricle from the pulmonary artery and the left ventricle from the aorta open shortly after the ventricles begin to contract. The opening of the semilunar valves ends a brief period of isometric (constant volume) ventricular contraction and initiates a period of rapid ventricular ejection.

Without early intervention on average 360,000 people out of the hospital succumb to cardiac arrest. “ Cardiac arrest and sudden death account for 60 percent of all deaths from coronary artery disease”,(Bledsoe, Porter, & Cherry, 2011,2007,2004, p. 1229)There are several causes of sudden cardiac arrest. Most are caused by ventricular fibrillation. “During ventricular fibrillation, the ventricles do not beat normally. Instead they quiver rapidly and irregularly.” When this occurs, the heart pumps very little and blood does not get circulated throughout the body. “ Most of the cases found with sudden cardiac death are related to undetected cardiovascular disease.("Sudden Cardiac Death," 2015, para. 2)Sudden cardiac arrest are immediate and drastic that includes sudden collapse, no pulse, not breathing, and loss of consciousness. “Four rhythms produce pulseless cardiac arrest: ventricular fibrillation, rapid ventricular tachycardia, pulseless electrical activity and asystole.”("Circulation ," 2005, p. IV-58)Other signs and symptoms that could occur prior to sudden cardiac arrest, include fatigue,

Lead I. In recording limb lead I, the negative terminal of the electrocardiograph is connected to the right arm and the positive terminal to the left arm. Therefore, when the point where the right arm connects to the chest is electronegative with respect to the point where the left arm connects, the electrocardiograph records positively, that is, above the zero voltage line in the electrocardiogram. When the opposite is true, the electrocardiograph records below the line. Lead II.

ECG : ventricular rate 54 beats/min, HR varying from 39 to 60 during a 45 minute period of monitoring, infrequent PVCs, ST elevation in leads II, III and avF indicating inferior injury or ischemia secondary to acute MI.

Regular electrical impulses are sent within the conduction system of the heart prompting contraction (Marieb, 2015). These electrical signals can be identified and documented by the use of an electrocardiography (ECG) machine. In a familiar ECG recording, three waves will occur; The P wave, QRS complex and

The heart is one of the most important organs in an organism’s body, no matter if they are aquatic, amphibian, or a mammal. This super organ works automatically, able to pump massive amounts of oxygen rich blood through the body by means of electrical impulses and the opening and closing of valves within its many layers. It is what keeps us and every other creature on this earth alive; so it is only natural for one to fear when there might be a problem with one’s heart. A cardiac arrhythmia can happen to anyone, no matter the age, race, or gender, and as such, doctors and scientist have spent years trying to better understand the heart and the way it functions so that they can try to prevent these problems and save millions of lives.

The purpose of these lab exercises is to understand the function and importance of an electrocardiogram. This lab will demonstrate how stress levels or different elevations can affect human heart rate. Furthermore, the equipment used in the experiment will show the functions in the right and left arm; as well as, in the right and left ankles. Finally, the lab will serve a purpose as a way to know how to read an electrocardiogram and calculate the heart rate.