ABERRANT VENTRICULAR CONDUCTION TYPES AND
... system, the phenomenon the authors observed originated within ischemic myocardium. In vitro studies indicate that the underlying mechanism may be related to postrepolarization refractoriness induced by ischemia7. Transitory BBB at the onset of an SVT is noted in 14% of the population, is more freque ...
... system, the phenomenon the authors observed originated within ischemic myocardium. In vitro studies indicate that the underlying mechanism may be related to postrepolarization refractoriness induced by ischemia7. Transitory BBB at the onset of an SVT is noted in 14% of the population, is more freque ...
DIasToLIC HEaRT FaILuRE – EmERgIng TREnDs
... of these factors, a relatively small increase in central blood volume or an increase in venous tone and/or arterial stiffness can cause a substantial increase in left atrial and pulmonary acute venous pressures and may result in pulmonary oedema15,16. A substantial number of patients with diastolic ...
... of these factors, a relatively small increase in central blood volume or an increase in venous tone and/or arterial stiffness can cause a substantial increase in left atrial and pulmonary acute venous pressures and may result in pulmonary oedema15,16. A substantial number of patients with diastolic ...
Problems - Heart Failure Society of America
... The information in this booklet is the copyrighted work of The Heart Failure Society of America and/or its affiliates and is protected under US and worldwide copyright laws and treaty provisions. The Heart Failure Society of America (HFSA) is a non-profit organization of healthcare professionals and ...
... The information in this booklet is the copyrighted work of The Heart Failure Society of America and/or its affiliates and is protected under US and worldwide copyright laws and treaty provisions. The Heart Failure Society of America (HFSA) is a non-profit organization of healthcare professionals and ...
Factors Associated with Ischemic Stroke on Therapeutic
... were included as controls when they had NVAF and received warfarin for more than 1 year with a mean INR ≥2. Controls should not have a cerebral infarction or TIA for one year while they had been on warfarin therapy with their mean INR ≥2. Controls were matched 1:1 to cases on age and gender. Clinica ...
... were included as controls when they had NVAF and received warfarin for more than 1 year with a mean INR ≥2. Controls should not have a cerebral infarction or TIA for one year while they had been on warfarin therapy with their mean INR ≥2. Controls were matched 1:1 to cases on age and gender. Clinica ...
Diastolic Heart Failure - American Academy of Family Physicians
... a poor prognosis.21 Recent studies also have shown that Doppler evaluation of myocardial velocities during ventricular relaxation predict elevated filling pressure. The E- and A-wave velocities are affected by blood volume and mitral valve anatomy and function. Furthermore, these wave velocities are ...
... a poor prognosis.21 Recent studies also have shown that Doppler evaluation of myocardial velocities during ventricular relaxation predict elevated filling pressure. The E- and A-wave velocities are affected by blood volume and mitral valve anatomy and function. Furthermore, these wave velocities are ...
Basic Cardiac Rhythms - UT Health : The University of Toledo
... hemodynamically compromised ▪ Treatment will be based on whether patient is symptomatic ...
... hemodynamically compromised ▪ Treatment will be based on whether patient is symptomatic ...
Investigations cardiaques et AVC-AIT
... been monitoring considered and the most Ischemic stroke32only (n 5 101) 5 .180). All patients in whom 7 (6.9%)was ...
... been monitoring considered and the most Ischemic stroke32only (n 5 101) 5 .180). All patients in whom 7 (6.9%)was ...
Role of catheter-induced mechanical trauma in localization of target
... Earliest atrial activation. This technique consists of a pointto-point exploration of the atrium, calculating the interval between the beginning of the intracavitary atrial deflection, recorded by the distal pair of the exploring catheter electrodes, and the beginning of the P wave on the surface el ...
... Earliest atrial activation. This technique consists of a pointto-point exploration of the atrium, calculating the interval between the beginning of the intracavitary atrial deflection, recorded by the distal pair of the exploring catheter electrodes, and the beginning of the P wave on the surface el ...
a pdf
... Ventricular extrasystoles – no P waves, broad and abnormal QRS complexes, and T waves interspersed between normal sinus rhythm – sometimes occur and do not require further investigation unless they are associated with symptoms (such as dizziness, palpitations, exercise intolerance, chest pain, short ...
... Ventricular extrasystoles – no P waves, broad and abnormal QRS complexes, and T waves interspersed between normal sinus rhythm – sometimes occur and do not require further investigation unless they are associated with symptoms (such as dizziness, palpitations, exercise intolerance, chest pain, short ...
Age-related sensitivity to nicotine for inducible atrial tachycardia and
... other confounding factors such as coronary, vascular, or valvular abnormalities that often accompany aging (17, 18). Twelve male rats consisting of six young (2–3 mo old) and six old (22–24 mo old) were first anesthetized with an intraperitoneal injection mixture of ketamine (100 mg/kg) and xylazine ...
... other confounding factors such as coronary, vascular, or valvular abnormalities that often accompany aging (17, 18). Twelve male rats consisting of six young (2–3 mo old) and six old (22–24 mo old) were first anesthetized with an intraperitoneal injection mixture of ketamine (100 mg/kg) and xylazine ...
Quantification of left and right atrial kinetic energy using four
... gap, and temporal resolution 30 ms. In total, the scan time for flow measurements and cine imaging was about 50 min. Image analysis and KE calculation. Images were analyzed using an in-house-developed module for the image analysis software Segment (http://segment.heiberg.se) (17). A first-order poly ...
... gap, and temporal resolution 30 ms. In total, the scan time for flow measurements and cine imaging was about 50 min. Image analysis and KE calculation. Images were analyzed using an in-house-developed module for the image analysis software Segment (http://segment.heiberg.se) (17). A first-order poly ...
PDF - Journal of the American Heart Association
... and July 2012. PeAF was defined as sustained >1 week, or sustained <1 week but requiring external cardioversion to recover sinus rhythm (SR) (according to 2007 guideline and 2011 updates).22-24 Patients were eligible if they had symptomatic, drug-refractory persistent AF, and were undergoing radiofre ...
... and July 2012. PeAF was defined as sustained >1 week, or sustained <1 week but requiring external cardioversion to recover sinus rhythm (SR) (according to 2007 guideline and 2011 updates).22-24 Patients were eligible if they had symptomatic, drug-refractory persistent AF, and were undergoing radiofre ...
PBMB - MEF Review_submitted_UNMARKED
... In contrast to the apparent regulatory effects on SAN activity, MEC in working myocardium is generally thought of as contributing to cardiac arrhythmias (although physiological roles in working myocardium may exist; see ‘Future Directions’ for a brief discussion). The most common sustained arrhythm ...
... In contrast to the apparent regulatory effects on SAN activity, MEC in working myocardium is generally thought of as contributing to cardiac arrhythmias (although physiological roles in working myocardium may exist; see ‘Future Directions’ for a brief discussion). The most common sustained arrhythm ...
Battery Status Information for Boston Scientific Pacemakers and
... will reach a battery status of Explant. Approximate time to explant is displayed as years, months, or < 3 months. When a battery status of Explant is reached, the text under the gauge will read “Explant was reached on.” A
three-month replacement window – starting on the indicated date – is av ...
... will reach a battery status of Explant. Approximate time to explant is displayed as years, months, or < 3 months. When a battery status of Explant is reached, the text under the gauge will read “Explant was reached on
chap 18b - Dr. Jerry Cronin
... Figure 18.15a Intrinsic cardiac conduction system and action potential succession during one heartbeat. ...
... Figure 18.15a Intrinsic cardiac conduction system and action potential succession during one heartbeat. ...
Echocardiographic Left Ventricular Mass Index Predicts
... Methods—Participants in the Jackson cohort of the Atherosclerotic Risk in Communities study have had extensive baseline evaluations, have undergone echocardiography during the third examination (1993–1995), and have been followed up for incident cardiovascular disease including ischemic stroke. Resu ...
... Methods—Participants in the Jackson cohort of the Atherosclerotic Risk in Communities study have had extensive baseline evaluations, have undergone echocardiography during the third examination (1993–1995), and have been followed up for incident cardiovascular disease including ischemic stroke. Resu ...
ECG basics
... ECG basics One of the most valuable diagnostic tools available, an electrocardiogram (ECG) records the heart’s electrical activity as waveforms. By interpreting these waveforms accurately, you can identify rhythm disturbances, conduction abnormalities, and electrolyte imbalances. An ECG aids in diag ...
... ECG basics One of the most valuable diagnostic tools available, an electrocardiogram (ECG) records the heart’s electrical activity as waveforms. By interpreting these waveforms accurately, you can identify rhythm disturbances, conduction abnormalities, and electrolyte imbalances. An ECG aids in diag ...
Print - Circulation
... Background Synchronized cardioversion is generally accepted as safe for the treatment of ventricular tachycardia and atrial fibrillation when shocks are synchronized to the R wave and delivered transthoracically. However, others have shown that during attempted transvenous cardioversion of rapid ven ...
... Background Synchronized cardioversion is generally accepted as safe for the treatment of ventricular tachycardia and atrial fibrillation when shocks are synchronized to the R wave and delivered transthoracically. However, others have shown that during attempted transvenous cardioversion of rapid ven ...
Article - Johns Hopkins Medicine
... voltage for activation more positive), thereby reducing automaticity (ectopic triggers) and prolonging conduction velocity (length of the tachycardia cycle) (12–14). Amiodarone may also reduce automaticity by decreasing the recruitment of voltage-dependent inward current (the “pacemaker current”) du ...
... voltage for activation more positive), thereby reducing automaticity (ectopic triggers) and prolonging conduction velocity (length of the tachycardia cycle) (12–14). Amiodarone may also reduce automaticity by decreasing the recruitment of voltage-dependent inward current (the “pacemaker current”) du ...
Chapter 03 - Sinus Mechanisms ECGs made Easy, Ch 3 Quiz
... Irregular due to the pause(s) caused by the SA block — the pause is the same as (or an exact multiple of) the distance between two other P-P intervals Positive (upright) in lead II, P waves look alike. When present, one precedes each QRS complex. 0.12–0.20 sec and constant from beat to beat 0.10 sec ...
... Irregular due to the pause(s) caused by the SA block — the pause is the same as (or an exact multiple of) the distance between two other P-P intervals Positive (upright) in lead II, P waves look alike. When present, one precedes each QRS complex. 0.12–0.20 sec and constant from beat to beat 0.10 sec ...
Left ventricular diastolic filling response to
... in spite of the physiologic increase in the left ventricle radius-to-wall thickness ratio. Transmitral ventricular diastolic function has recently been recognized as an important component to the overall cardiac performance in normal adults and in patients with congestive heart failure. Determinatio ...
... in spite of the physiologic increase in the left ventricle radius-to-wall thickness ratio. Transmitral ventricular diastolic function has recently been recognized as an important component to the overall cardiac performance in normal adults and in patients with congestive heart failure. Determinatio ...
The Wenckebach Phenomenon: A Salute and Comment on the
... over the top” of the previous ventricular pulse wave (for example, the 5th and 12th atrial pulse waves), indicating that the atrioventricular pulse interval is longer than the ventricular pulse interval (Marriott HJ. Personal communication). This may be the first time that this phenomenon was docume ...
... over the top” of the previous ventricular pulse wave (for example, the 5th and 12th atrial pulse waves), indicating that the atrioventricular pulse interval is longer than the ventricular pulse interval (Marriott HJ. Personal communication). This may be the first time that this phenomenon was docume ...
Teaching Rounds in Cardiac Electrophysiology
... delivered at the PSMA eliminated AP conduction, although the ventricular activation time was not significantly earlier than the PSTA region. APs at this region have distinct ECG characteristics and are correlated with anatomic Section 3 (Figure 2), where a wide portion of atrial myocardium overrides ...
... delivered at the PSMA eliminated AP conduction, although the ventricular activation time was not significantly earlier than the PSTA region. APs at this region have distinct ECG characteristics and are correlated with anatomic Section 3 (Figure 2), where a wide portion of atrial myocardium overrides ...
Pacemaker potential - Anatomy and Physiology
... Figure 18.15a Intrinsic cardiac conduction system and action potential succession during one heartbeat. ...
... Figure 18.15a Intrinsic cardiac conduction system and action potential succession during one heartbeat. ...
SA Node: impulse
... Normally the signal for cardiac electrical stimulation starts in the sinus node (also called the sinoatrial or SA node). The sinus node is located in the right atrium near the opening of the superior vena cava. It is a small collection of specialized cells capable of spontaneously generating electri ...
... Normally the signal for cardiac electrical stimulation starts in the sinus node (also called the sinoatrial or SA node). The sinus node is located in the right atrium near the opening of the superior vena cava. It is a small collection of specialized cells capable of spontaneously generating electri ...
Atrial fibrillation
Atrial fibrillation (AF or A-fib) is an abnormal heart rhythm characterized by rapid and irregular beating. Often it starts as brief periods of abnormal beating which become longer and possibly constant over time. Most episodes have no symptoms. Occasionally there may be heart palpitations, fainting, shortness of breath, or chest pain. The disease increases the risk of heart failure, dementia, and stroke.Hypertension and valvular heart disease are the most common alterable risk factors for AF. Other heart-related risk factors include heart failure, coronary artery disease, cardiomyopathy, and congenital heart disease. In the developing world valvular heart disease often occurs as a result of rheumatic fever. Lung-related risk factors include COPD, obesity, and sleep apnea. Other factors include excess alcohol intake, diabetes mellitus, and thyrotoxicosis. However, half of cases are not associated with one of these risks. A diagnosis is made by feeling the pulse and may be confirmed using an electrocardiogram (ECG). The typical ECG shows no P waves and an irregular ventricular rate.AF is often treated with medications to slow the heart rate to a near normal range (known as rate control) or to convert the rhythm to normal sinus rhythm (known as rhythm control). Electrical cardioversion can also be used to convert AF to a normal sinus rhythm and is often used emergently if the person is unstable. Ablation may prevent recurrence in some people. Depending on the risk of stroke either aspirin or anti-clotting medications such as warfarin or a novel oral anticoagulant may be recommended. While these medications reduce this risk, they increase rates of major bleeding.Atrial fibrillation is the most common serious abnormal heart rhythm. In Europe and North America, as of 2014, it affects about 2% to 3% of the population. This is an increase from 0.4 to 1% of the population around 2005. In the developing world about 0.6% of males and 0.4% of females are affected. The percentage of people with AF increases with age with 0.14% under 50 years old, 4% between 60 and 70 years old, and 14% over 80 years old being affected. A-fib and atrial flutter resulted in 112,000 deaths in 2013, up from 29,000 in 1990. The first known report of an irregular pulse was by John Baptist Senac in 1749. This was first documented by ECG in 1909 by Thomas Lewis.