Correspondence - Circulation: Arrhythmia and Electrophysiology
... 6. Opthof T, Coronel R, Wilms-Schopman FJG, Plotnikov AN, Shlapakova IN, Danilo P, Rosen MR. Dispersion of repolarization in canine ventricle and the electrocardiographic T wave: Tp-e interval does not reflect transmural dispersion. Heart Rhythm. 2007;4:341–348. ...
... 6. Opthof T, Coronel R, Wilms-Schopman FJG, Plotnikov AN, Shlapakova IN, Danilo P, Rosen MR. Dispersion of repolarization in canine ventricle and the electrocardiographic T wave: Tp-e interval does not reflect transmural dispersion. Heart Rhythm. 2007;4:341–348. ...
Cardiovascular System
... • The QRS complex is composed of three individual waves, the Q, R, and S waves. • The QRS complex results from ventricular depolarization and signal the onset of ventricular contraction. ...
... • The QRS complex is composed of three individual waves, the Q, R, and S waves. • The QRS complex results from ventricular depolarization and signal the onset of ventricular contraction. ...
The Heart
... Pulmonary Semilunar => 25 mmHg (minimum pressure) Aortic Semilunar => 80 mmHg (minimum pressure) ...
... Pulmonary Semilunar => 25 mmHg (minimum pressure) Aortic Semilunar => 80 mmHg (minimum pressure) ...
ductal dependent lesions - Calgary Emergency Medicine
... single functioning RV) • IVC Pulm art • *Dependent on passive flow to the lungs* ...
... single functioning RV) • IVC Pulm art • *Dependent on passive flow to the lungs* ...
F - Notes - Disorders of the Heart
... What do veins do? Bring blood TOWARD the heart What do veins have that arteries don’t? VALVES – (veins & arteries both have the same layers except the muscular layer is smaller) ...
... What do veins do? Bring blood TOWARD the heart What do veins have that arteries don’t? VALVES – (veins & arteries both have the same layers except the muscular layer is smaller) ...
5. Setting the Tempo - hills
... • Electrocardiogram (ECG or EKG) – test that measures the electrical activity of the heart. – Traces how long the electrical wave takes to pass through your heart – Printed on paper covered with a grid of squares each represents 0.04 seconds. • 25 squares = 1 second • ECG’s printouts are usually is ...
... • Electrocardiogram (ECG or EKG) – test that measures the electrical activity of the heart. – Traces how long the electrical wave takes to pass through your heart – Printed on paper covered with a grid of squares each represents 0.04 seconds. • 25 squares = 1 second • ECG’s printouts are usually is ...
Antiarrythmic drugs
... decrease in conduction velocity ( negative dromotropic effect )mainly at AVN. In cardiac pacemaker cells ( SAN) , inhibits pacemaker current, which the slope of phase 4 of pacemaker action potential ( spontaneous firing rate {negative chronotropic effect}) ...
... decrease in conduction velocity ( negative dromotropic effect )mainly at AVN. In cardiac pacemaker cells ( SAN) , inhibits pacemaker current, which the slope of phase 4 of pacemaker action potential ( spontaneous firing rate {negative chronotropic effect}) ...
Document
... receives blood from pulmonary veins (oxygen rich blood from the lungs) What does the function of the left ventricle ? receives blood from left atria & pumps it to the body (through the aorta) What is the function of the right ventricle? receives blood from the right atria and pumps it to the lungs ( ...
... receives blood from pulmonary veins (oxygen rich blood from the lungs) What does the function of the left ventricle ? receives blood from left atria & pumps it to the body (through the aorta) What is the function of the right ventricle? receives blood from the right atria and pumps it to the lungs ( ...
3.4 PSYCHOACTIVE DRUGS AND HOMEOSTASIS
... depressants delay the effects of neurotransmitters, slowing down the transmission of impulses. Some stimulants prevent the breakdown of neurotransmitter molecules. The neurotransmitters remain on receptors longer, resulting in more frequent impulses. 3. Short-term effects include slower heart rate, ...
... depressants delay the effects of neurotransmitters, slowing down the transmission of impulses. Some stimulants prevent the breakdown of neurotransmitter molecules. The neurotransmitters remain on receptors longer, resulting in more frequent impulses. 3. Short-term effects include slower heart rate, ...
Modified Bruce Protocol: Treadmill Testing for Cardiac Health
... depression greater than 3 mm is considered a positive stress test and further testing would be performed. Whatever the incident is, it seems to be a temporary, reversible, event. The ST segment depression, however, may also serve as a "wake up call". Dietary strategies may be undertaken and blood te ...
... depression greater than 3 mm is considered a positive stress test and further testing would be performed. Whatever the incident is, it seems to be a temporary, reversible, event. The ST segment depression, however, may also serve as a "wake up call". Dietary strategies may be undertaken and blood te ...
Left Bundle Branch Block in a 29-Year-Old Non
... transient LBBB. Evaluation with stress echo was negative for valve disease, wall motion abnormalities or functional abnormality. He was treated for presumed anxiety and discharged home. An EKG prior to discharge (Fig. 1c) showed resolution of the transient LBBB. Two years later, the patient presente ...
... transient LBBB. Evaluation with stress echo was negative for valve disease, wall motion abnormalities or functional abnormality. He was treated for presumed anxiety and discharged home. An EKG prior to discharge (Fig. 1c) showed resolution of the transient LBBB. Two years later, the patient presente ...
heart anatomy & arrhythmias
... Pacemaker of the heart → SA node → initiates depolarization of the myocardium Beats at its own inherent rate of 60 bpm to 100 bpm Bradycardia → slow heart rate < 60 bpm Common in athletes → ↑ stroke volume, ↓ heart rate Increased vagal stimulation → release of hormones that slow down the heart r ...
... Pacemaker of the heart → SA node → initiates depolarization of the myocardium Beats at its own inherent rate of 60 bpm to 100 bpm Bradycardia → slow heart rate < 60 bpm Common in athletes → ↑ stroke volume, ↓ heart rate Increased vagal stimulation → release of hormones that slow down the heart r ...
Is it a heart attack?
... you can’t seem to catch your breath. Worse, a sudden go away with rest. It may be in the chest, neck, jaw, pain shocks you unexpectedly. You had better call 911 shoulder, arms or back and may feel like burning, squeezing, heaviness or pressure. It may be chest right now — you are probably having a h ...
... you can’t seem to catch your breath. Worse, a sudden go away with rest. It may be in the chest, neck, jaw, pain shocks you unexpectedly. You had better call 911 shoulder, arms or back and may feel like burning, squeezing, heaviness or pressure. It may be chest right now — you are probably having a h ...
Cardiac_Cycle
... • The cardiac cycle is the sequence of events in one heartbeat. • It has three phases. ...
... • The cardiac cycle is the sequence of events in one heartbeat. • It has three phases. ...
Chapter 37
... The following is a list of the main themes covered in this chapter and some study objectives. As you study, focus on these areas. Understand how the information you study fits into these themes and how these themes relate to each other. Be sure you master each objective before moving on. 1. Blood, e ...
... The following is a list of the main themes covered in this chapter and some study objectives. As you study, focus on these areas. Understand how the information you study fits into these themes and how these themes relate to each other. Be sure you master each objective before moving on. 1. Blood, e ...
Rapid Heart Rate - Milliken Animal Clinic
... • β-adrenergic blocker—atenolol can be administered as long as the pet does not have underlying moderate-tosevere heart muscle failure (known as “myocardial failure”) • Diltiazem is the calcium channel blocker of choice for long-term control of rapid heart rate (supraventricular tachycardia) • Medic ...
... • β-adrenergic blocker—atenolol can be administered as long as the pet does not have underlying moderate-tosevere heart muscle failure (known as “myocardial failure”) • Diltiazem is the calcium channel blocker of choice for long-term control of rapid heart rate (supraventricular tachycardia) • Medic ...
rapid_heart_rate
... • β-adrenergic blocker—atenolol can be administered as long as the pet does not have underlying moderate-tosevere heart muscle failure (known as “myocardial failure”) • Diltiazem is the calcium channel blocker of choice for long-term control of rapid heart rate (supraventricular tachycardia) • Medic ...
... • β-adrenergic blocker—atenolol can be administered as long as the pet does not have underlying moderate-tosevere heart muscle failure (known as “myocardial failure”) • Diltiazem is the calcium channel blocker of choice for long-term control of rapid heart rate (supraventricular tachycardia) • Medic ...
Case 3 A 50-year-old man presenting with palpitations
... Box 8 Rate control versus rhythm control Restoration of sinus rhythm (‘rhythm control’) is usually considered the ‘gold standard’ treatment for atrial fibrillation. However, this is not always possible and even where it is achieved, the effect may be only temporary; a large proportion of patients wi ...
... Box 8 Rate control versus rhythm control Restoration of sinus rhythm (‘rhythm control’) is usually considered the ‘gold standard’ treatment for atrial fibrillation. However, this is not always possible and even where it is achieved, the effect may be only temporary; a large proportion of patients wi ...
Practical 1 CV
... structures of the excito-conductive system: the atrio-ventricular (AV) node (40/min), bundle of His and its branches and the Purkinje system (25-30/min). Normally, the highest rate of SA node paces the excitatory drive in the whole heart, consecutively suppressing the spontaneous depolarization of o ...
... structures of the excito-conductive system: the atrio-ventricular (AV) node (40/min), bundle of His and its branches and the Purkinje system (25-30/min). Normally, the highest rate of SA node paces the excitatory drive in the whole heart, consecutively suppressing the spontaneous depolarization of o ...
Can I have Heart Failure with a Normal Heart Function?
... they are dependent on the pacemaker part of the device. At this time the recommendations are not to remove all the devices prematurely. However, the device needs to be immediately replaced when it does reach ERI. There may be some individuals who are higher risk that may need their device replaced b ...
... they are dependent on the pacemaker part of the device. At this time the recommendations are not to remove all the devices prematurely. However, the device needs to be immediately replaced when it does reach ERI. There may be some individuals who are higher risk that may need their device replaced b ...
Congestive Heart failure is the end result of many cardiac diseases
... This is the rate that they are breathing at when they are completely at rest and calm. To count your pet’s respiratory rate, count the number of breaths that they take in one minute. Breathing in and out count as one full breath. Normal respiratory rate will vary from animal to animal, but should ge ...
... This is the rate that they are breathing at when they are completely at rest and calm. To count your pet’s respiratory rate, count the number of breaths that they take in one minute. Breathing in and out count as one full breath. Normal respiratory rate will vary from animal to animal, but should ge ...
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.