LAB 6 - Michele Ahmadi: Systems Physiology Lab 6 Tues-...

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Michele Ahmadi: Systems Physiology Lab 6 Tues- 6:40-10:00, Jen 1 Electrocardiogram and Blood Pressure Abstract Electrical impulses of the heart can be recorded by an ECG and then used to assess the condition of the heart. Standard limb leads recorded the difference in electrical potentials between strategically placed electrodes, and a single resulting ECG waveform was measured. Measurements were done with time segments and analyzed for deviations from the allotted normal time durations. The subject was within normal limits with an exception of a 0.005sec lower P-wave duration, and a 0.006sec lower S-T segment duration than normal. Heart rate and excitation-contraction delays were also calculated from the ECG readings, and were used to assess the condition of the heart. With an average range of 70-75 BPM for adult women, the subject fell within normal limits with a 72 BPM reading. Additionally, the QRS waves produced from the ECG reading was analyzed and graphed using Einthoven’s triangle to calculate the overall direction and magnitude of the electrical impulses conducted over the heart –the mean electrical axis. Our subject had a 80 o axis, which was within normal limits. Systolic and diastolic arterial blood pressure was measured using Korotkoff sounds, and was recorded as 124mmHg and 78mmHg respectively, which both were within normal ranges. Mean BP and pulse pressure were derived from systolic and diastolic blood pressures. Both ECG results and blood pressure readings were used as a means of non-invasive diagnostic tools. The monitoring aided in the detection of any potential arrhythmias, as well as providing a picture of the condition of the subject’s heart. Introduction The cardiovascular system of the body consists of the heart, its blood vessels and blood –with the heart providing the impetus for blood flow. The cardiovascular system integrates the body as a unit by providing a continuous stream of blood moving from the heart to every other part of the body. The vital role of the cardiovascular system in maintaining homeostasis depends on this continuous
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and controlled movement of blood through the transporting vessels that permeate every tissue and reach every cell. Numerous control mechanisms help to regulate and integrate the diverse functions and component parts of the cardiovascular system in order to supply blood to specific body areas according to need. These mechanisms ensure a constant internal environment surrounding each body cell regardless of differing demands. Monitoring heart-status can thus provide insight to various body conditions or disturbances within the heart itself that may disturb circulation and homeostasis. Of all the organs, the heart has a unique ability to contract by itself independent of any stimulation from the body. Because of a self-induced electrical pulsation, or automaticity, the heart is stimulated to contract and thus pump blood to the body organs. The normal electrical impulse of the heart begins in the sinoatrial node (SA node) which occupies the superior aspect of the right atrium. Because the SA node has an intrinsic rhythm, it is the “pacemaker”. If left to its inherent rhythmicity,
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This note was uploaded on 04/03/2008 for the course EX SCI 01:146:357 taught by Professor Merrill during the Spring '08 term at Rutgers.

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LAB 6 - Michele Ahmadi: Systems Physiology Lab 6 Tues-...

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