What Is the Value of QRS Duration for the Prediction of Response to Cardiac Resynchronization Therapy?doi:10.1111/j.1541-9215.2007.05603.xGabe B. BleekerJeroen J. BaxAmerican Heart Hospital JournalBleeker GB, Bax JJ. What is the value of QRS duration for the prediction of response to cardiac...
The debate on the effect of heart rate changes on QRS duration in normal subjects is not yet fully clarified. The concomitant release of an original research article together with two editorials from the reviewers perfectly illustrates the current dilemma. In a previous issue of the journal, Mason...
Blood moves through the heart because of changes in pressure. What is causing this change of pressure? What is the normal rate of a heartbeat? During exercise, why do you think there is a large increase in systolic pressure, but very little change diastolic pressure?
is defined as the intersection point of the descending limb of the U wave and the isoelectric baseline. This method reflects accurately the real duration of ventricular repolar- ization, but it introduces a large degree of subjectivity, par- ticularly when biphasic T waves are present or ...
In reference to the ECG (electrocardiogram): A. What does the P wave represent? B. What does the QRS complex represent? C. What does the T wave represent? Which of the following is true regarding ventricular tachycardia? a) It is associated with normal QRS complexes. b) It ma...
In this index case subsequent to the introduction of sensed extra stimulus during the tachycardia the QRSmorphology has become narrowwith duration of 60ms and there is clear isoelectric line preceding the QRS. The atrial activation and ventricular activation patterns are different from the tachycardia ...
Acute heart failure (AHF) is a major burden disease, with a complex physiopathology, unsatisfactory diagnosis, treatment and a very poor prognosis. In the last two decades, a number of drugs have progressed from preclinical to early and late clinical development, but only a few of them have ...
Polymorphic ventricular tachycardia (PVT) is a type of abnormally fast heart with a continuously varying QRS complex morphology in an electrocardiogram. Therefore, QRS complexes vary in amplitude, axis, and duration in PVT. When ventricular tachycardia originates in different places around the ...
What is the normal heart rate set by the SA node, AV node, and Bundle of his of the heart? Epinephrine does what to heart rate? How does the fitness level of an individual affect their cardiac output? What is the average approximate heart rate at rest? A) 22 beats...
What is the EKG? Explain the following waves and intervals: P-wave, P-R interval, QRS wave, S-T segment, QT interval and T wave. Heart: The heart has the right as well as left chambers that are detached by a wall. It is a k...