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I. Cardiac Cycle A. Systole – Contraction of Ventricles (unless noted
I. Cardiac Cycle A. Systole – Contraction of Ventricles (unless noted

... E. Electrocardiography - Electrocardiogram (EKG or ECG) 1. Components of the ECG a. Standard grid 1) x axis measures time in seconds (s) 2) y axis measures amplitude in millivolts (mV) b. Isoelectric line – baseline c. Deflection waves – record voltage and time of electrical events of large amounts ...
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SAMPLE QUESTION PAPER - 2 XI- BIOLOGY Time: 3 Hrs MM: 70

... 30. ECG is a graphical representation of the electrical activity of the heart during a cardiac cycle. A patient is connected to the machine with three electrical leads (one to each wrist and to the left ankle) that continuously monitor the heart activity. For a detailed evaluation of the heart’s fun ...
CARDIAC ARREST DURING ELECTIVE ORTHOPEDIC SURGERY DUE TO MODERATE HYPOKALEMIA m
CARDIAC ARREST DURING ELECTIVE ORTHOPEDIC SURGERY DUE TO MODERATE HYPOKALEMIA m

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“ Delineation of ECG Signal by using various method and
“ Delineation of ECG Signal by using various method and

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Overview: Any irregular heart beat is called an arrhythmia. Some

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Correlation Between ST‐Segment Elevation and Negative T Waves

... A 48-year-old female was admitted to the same hospital with new onset of dyspnea, tachycardia, dizziness and diaphoresis in relation to activity. Her medical history revealed antihypertensive medication for 3 years, but no dyspnea or chest discomfort. A previous ECG 1 month before admission, when th ...
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Sudden Cardiac Death (SCD) is a prevalent topic and concern for all

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... in the ventricles during diastolic filling, which has two phases. The first is rapid and passive, and occurs when the atrioventricular valves open. S4 is associated with the second phase, which occurs in late ventricular diastole when the atria contract, actively forcing blood into the ventricles. T ...
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Intrinsic Conducting System
Intrinsic Conducting System

... interventricular septum where it divides into two branches and continues as Purkinje fibers. 30 - 60 impulses/min 4. Purkinje fibers are large, modified cardiac muscle cells that make contact with other part of the cardiac muscle. 15 - 40 impulses/min ...
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Atrial_Flutter

... (ventricular depolarization) because the AV node acts as a filter. Some flutter waves reach the AV node when it is refractory and thus are not propagated to the ventricles. The ventricular rate is usually regular but slower than the atrial rate. A whole number fixed ratio of flutter waves to QRS com ...
The Raw ECG Signal Processing and the Detection of QRS Complex
The Raw ECG Signal Processing and the Detection of QRS Complex

... executed using a special device - the electrocardiograph, which consists of electrodes that are placed on the surface of the body. Electrodes capture the electrical currents. The most commonly is used 12-electrode ECG which record six limb leads and the six chest leads. Portable ECGs usually tend to ...
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Electrocardiography



Electrocardiography (ECG or EKG*) is the process of recording the electrical activity of the heart over a period of time using electrodes placed on a patient's body. These electrodes detect the tiny electrical changes on the skin that arise from the heart muscle depolarizing during each heartbeat.In a conventional 12 lead ECG, ten electrodes are placed on the patient's limbs and on the surface of the chest. The overall magnitude of the heart's electrical potential is then measured from twelve different angles (""leads"") and is recorded over a period of time (usually 10 seconds). In this way, the overall magnitude and direction of the heart's electrical depolarization is captured at each moment throughout the cardiac cycle. The graph of voltage versus time produced by this noninvasive medical procedure is referred to as an electrocardiogram (abbreviated ECG or EKG).During each heartbeat, a healthy heart will have an orderly progression of depolarization that starts with pacemaker cells in the sinoatrial node, spreads out through the atrium, passes through the atrioventricular node down into the bundle of His and into the Purkinje fibers spreading down and to the left throughout the ventricles. This orderly pattern of depolarization gives rise to the characteristic ECG tracing. To the trained clinician, an ECG conveys a large amount of information about the structure of the heart and the function of its electrical conduction system. Among other things, an ECG can be used to measure the rate and rhythm of heartbeats, the size and position of the heart chambers, the presence of any damage to the heart's muscle cells or conduction system, the effects of cardiac drugs, and the function of implanted pacemakers.
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