Figure 8 Bar Chart showing Average QRS Interval
in Athletes and Non Athletes QRS Interval
Athletes 98 Non Athletes 90 Note: Table made from bar graph.
Sodium channel blockers including class I antiarrhythmics by blocking inward sodium current can slow depolarization, reduce conduction velocity, and prolong the QRS interval
and consequently may increase the risk of arrhythmia [13,16].
02 (a) Participants with a QRS interval
[greater than or equal to] 120 ms were excluded from the analyses.
Study subjects whose EKGs showed prolonged QRS intervals
had SNPs in common with each other.
Preimplantation rhythm and PR and QRS intervals
were recorded with the use of conventional 12-lead electrocardiography.
Logistic regression analysis was performed in patients with narrow QRS interval
Since June 2003, CMS has covered ICDs in patients with ischemic dilated car diomyopathy (IDCM), a left ventricular ejection fraction less than 30%, and a QRS interval
greater than 120 milliseconds.
They also had to have cardiac dyssynchrony as reflected by a QRS interval
of at least 120 msec.
4 mg/dL or more, QRS interval
140 milliseconds or more, and atrial fibrillation.
A prolonged QRS interval
has been required for participation in all major CRT trials and is routinely used as a screening criterion for CRT eligibility in clinical practice.
At present, based upon data from the pre-SCD-HeFT era, Medicare will pay for an ICD in a patient who has ischemic heart failure, a left ventricular ejection fraction of 30% or less, prior MI, and an electrocardiogram showing a QRS interval
or at least 120 milliseconds, regardless of whether the patient has experienced prior cardiac arrest.
Factors such as age, gender, left ventricular ejection fraction, New York Heart Association class, medical therapy, and QRS interval
all failed to affect the basic finding that ICDs save lives.