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Therapy: Cardiac Resynchronization Therapy
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Total 65 results found since Jan 2013.
COAPT Trial of Transcatheter Mitral Valve Repair in Patients with Heart Failure
Patients with heart failure and left ventricular dilatation may have secondary or functional mitral regurgitation. This is due to alteration of the left ventricular geometry producing changes in the functioning of papillary muscles and chordae tendineae and poor coaptation of the mitral leaflets. Secondary mitral regurgitation causes volume overloading of the left ventricle and is associated with reduced survival, increased hospitalization rates and decreased quality of life [1, 2]. Secondary mitral regurgitation can be reduced by guideline directed medical therapy and cardiac resynchronization therapy. This will also pro...
Source: Cardiophile MD - June 5, 2023 Category: Cardiology Authors: Johnson Francis Tags: General Cardiology Structural Heart Disease Interventions Source Type: blogs
Heart failure in chronic kidney disease – Cardiology Basics
Heart failure in chronic kidney disease – Cardiology Basics
Prevalence of both heart failure and chronic kidney disease (CKD) are increasing as the population is aging globally. Hence heart failure in chronic kidney disease is seen more often. Presence of CKD in heart failure increases morbidity and mortality. Though there is increasing use of effective medications and special devices like cardiac resynchronization therapy in heart failure patients in general, those with CKD have not been benefited well.
CKD is defined as abnormalities of kidney structure or function, present for >3 months, with implications for h...
Source: Cardiophile MD - October 21, 2022 Category: Cardiology Authors: Johnson Francis Tags: General Cardiology Source Type: blogs
What is complete heart block? Cardiology Basics
When natural pacemaker impulses from the sinoatrial node fails to reach the ventricles and activate them, it is known as complete heart block. The block could be at the level of the atrioventricular (AV) node or below that.
Sinus node is a subepicardial structure located in the upper part of right atrium near the orifice of the superior vena cava. Signals from sinus node travel to the AV node through three internodal pathways. They are Wenckebach, Thorel and Bachmann bundles. Bachmann bundle gives a branch to the left atrium also.
AV node is located near the atrioventricular junction in the lower part of right atrium. It ...
Source: Cardiophile MD - October 17, 2022 Category: Cardiology Authors: Johnson Francis Tags: General Cardiology Source Type: blogs
What is the difference between CRT-P and CRT-D? Cardiology Basics
In cardiology, CRT stands for cardiac resynchronization therapy. CRT is used in heart failure with reduced ejection fraction. According to the Universal Definition and Classification of Heart Failure, heart failure with reduced ejection fraction has left ventricular ejection fraction of 40% or less. CRT is a type of pacemaker in which three chambers of the heart are paced, right atrium, right ventricle and left ventricle.
This picture illustrates what reduced ejection fraction means. Ejection fraction is the fraction of end diastolic volume which is pumped out from the left ventricle during systole. Normal ejection fracti...
Source: Cardiophile MD - October 13, 2022 Category: Cardiology Authors: Johnson Francis Tags: General Cardiology Source Type: blogs
Single chamber or dual chamber pacemaker? Cardiology Basics
The decision between single chamber and dual chamber pacemaker though important based on cost, device longevity and complication wise, is not that easy to make. I am trying to summarize based on the 2018 American College of Cardiology/American Heart Association/Heart Rhythm Society guidelines on this aspect [1]. In underprivileged regions, given an option, there is always a potential bias towards single chamber devices as they are cheaper, tend to have more battery life, easier to implant and likely to have lesser procedure and lead related issues.
In symptomatic sinus node dysfunction, with correlation between symptoms a...
Source: Cardiophile MD - October 10, 2022 Category: Cardiology Authors: Johnson Francis Tags: General Cardiology Source Type: blogs
Coronary venous circulation
Importance of knowing the coronary venous circulation has increased in recent years with use of cardiac resynchronization therapy (CRT) for heart failure. Left ventricular epicardial pacing in CRT is achieved by placing a lead in a coronary vein, usually a posterolateral tributary of the coronary sinus.
Coronary venous circulation can be visualized by a coronary angiogram levophase. After filling the coronary arteries, the contrast drains into the coronary venous system, finally opacifying the coronary sinus, which drains into the right atrium. Here is a coronary angiogram levophase, with a line diagram beside it:
Coronar...
Source: Cardiophile MD - June 26, 2021 Category: Cardiology Authors: Prof. Dr. Johnson Francis Tags: Cardiology Source Type: blogs
Left ventricular reverse remodeling
In this study, change in LVESV was the single most important predictor of all cause and cardiovascular mortality. Clinical parameters could not predict outcome events in this study.
Similar beneficial effect on left ventricular remodeling was demonstrated long back in the trials with angiotensin converting enzyme inhibitors. SOLVD (Studies of Left Ventricular Dysfunction) study showed that in patients with heart failure and reduced left ventricular ejection fraction, chronic treatment with angiotensin converting enzyme inhibitor enalapril prevented progressive left ventricular dilatation, systolic dysfunction and increase ...
Source: Cardiophile MD - June 11, 2021 Category: Cardiology Authors: Prof. Dr. Johnson Francis Tags: Cardiology Source Type: blogs
Left ventricular remodeling
Left ventricular remodeling occurs in response to left ventricular stress and injury. It is progressive and occurs after large myocardial infarctions and dilated cardiomyopathy. Left ventricular volume increases and the normal elliptical shape becomes globular. Left ventricular remodeling is associated with changes at microscopic level which include myocyte hypertrophy, apoptosis and increased interstitial collagen deposition [1]. Left ventricular remodeling is a central pathophysiological mechanism in advancing heart failure. Reversal of remodeling with treatment is an important goal in the management of heart failure. ...
Source: Cardiophile MD - April 2, 2021 Category: Cardiology Authors: Prof. Dr. Johnson Francis Tags: Cardiology Source Type: blogs
Cardiology X-ray chest PA view
In this lecture, we will have an overview of Cardiology X-ray Chest PA view. This will cover pulmonary veins, pulmonary arteries, various cardiac chamber enlargements, prosthetic heart valves, cardiac implantable electronic devices like pacemakers, cardiac resynchronization therapy and implantable cardioverter defibrillator appearances on chest X-ray.
Source: Cardiophile MD - November 12, 2020 Category: Cardiology Authors: Prof. Dr. Johnson Francis Tags: Cardiology cardiac chamber enlargementg cardiac implantable electronic devices like pacemakers implantable cardioverter defibrillator prosthetic heart valves pulmonary arteries pulmonary artery Source Type: blogs
Abbott ’s Gallant Heart Rhythm Implants FDA Approved
Abbott won FDA approval for its Gallant implantable cardioverter defibrillator and cardiac resynchronization therapy defibrillator devices. Cleared in Europe earlier this year, the implants feature Bluetooth connectivity, allowing data to stream to a...
Source: Medgadget - July 6, 2020 Category: Medical Devices Authors: Medgadget Editors Tags: Cardiac Surgery Cardiology Source Type: blogs
Abbott ’s Gallant Implantable Cardioverter Defibrillators FDA Approved
Abbott won FDA approval for its Gallant implantable cardioverter defibrillator and cardiac resynchronization therapy defibrillator devices. Cleared in Europe earlier this year, the implants feature Bluetooth connectivity, allowing data to stream to a...
Source: Medgadget - July 6, 2020 Category: Medical Devices Authors: Medgadget Editors Tags: Cardiac Surgery Cardiology Source Type: blogs
Optimizer System for Cardiac Contractility Modulation: Interview with Dr. Ishu Rao, Medical Director of Impulse Dynamics
Impulse Dynamics, based in Mt. Laurel, New Jersey, has developed the Optimizer system, a device designed to improve myocardial contractility in patients with heart failure. The system is intended to improve the quality of life of heart failure patien...
Source: Medgadget - April 3, 2020 Category: Medical Devices Authors: Conn Hastings Tags: Cardiac Surgery Cardiology Exclusive Radiology Rehab Source Type: blogs
Abbott ’s Gallant Cardiac Implants Cleared in Europe
Abbott won clearance in the European Union for its new Gallant implantable cardioverter defibrillator (ICD) and cardiac resynchronization therapy defibrillator (CRT-D) implants.
The MRI compatible devices, which Abbott claims have an extended bat...
Source: Medgadget - February 25, 2020 Category: Medical Devices Authors: Medgadget Editors Tags: Cardiac Surgery Cardiology Source Type: blogs
EU Clears Medtronic ’s Smart Cobalt and Crome Cardiac Implants
Medtronic has announced that its Cobalt and Crome implantable cardioverter-defibrillators (ICD) and cardiac resynchronization therapy-defibrillators (CRT-D) won EU CE Mark clearance, allowing their introduction to the continent.
The devices featu...
Source: Medgadget - January 31, 2020 Category: Medical Devices Authors: Medgadget Editors Tags: Cardiac Surgery Cardiology Source Type: blogs
Why ventricular tachycardia has wide QRS complex ?
Why VTs have wide QRS complex?
Brief answer: VT usually presents with wide QRS tachycardia because it originates in ventricular myocardium, travels muscle to muscle instead of the normal conduction system. However, VTs need not be wide always, if it captures the conduction system early and more proximally it can be as narrow as SVT.
Further reading: Only for cardiology fellows
Two empirical statements are made here. (The scientific chances of both being reasonably correct are fair)
80 % of wide QRS tachycardia by default is VT. That means 20 % of wide QRS is not VT. We all accept that.
80 % of narrow QRS tachycardia i...
Source: Dr.S.Venkatesan MD - December 4, 2019 Category: Cardiology Authors: dr s venkatesan Tags: Uncategorized Source Type: blogs
