R/S Ratio Variability in Lead V1 Observed between Selected Four 1-Minute ECG Fragments of 24-Hour ECG as a Predictor of Incomplete Resynchronization during Full 24-Hour ECG: Pilot Study.

Background: About 30% of patients do not have an effective cardiac resynchronization therapy (CRT). Routine assessment of CRT by devices interrogation (DI) is not entirely reliable. Additional information provide detailed QRS analysis in 24-hour ECG, however it is time-consuming.

Analysis of the QRS morphology in lead V1 during 24-hour Holter electrocardiogram monitoring to evaluate function of a cardiac resynchronisation therapy device in patients with sinus rhythm: a pilot study.

Background: Cardiac resynchronisation therapy (CRT) is an important advance in the treatment of chronic heart failure. The aim of CRT is biventricular capture in all beats. However, inadequate delivery of biventricular pacing is still seen in about 30% of patients with an implanted CRT device.

Influence of warm‑up ischemia on the effects of exercise training in patients with stable angina.

Introduction:  It is still unknown whether ischemia‑inducing training in patients with stable angina is superior to the training conducted below the ischemic threshold (IT) according to the current guidelines.

Objectives:  The aim of the study was to assess the influence of warm‑up ischemia prior to training on the effects of training conducted either at or below the IT in patients with stable angina.

Patients And Methods:  Thirty male patients aged 56 ±8 years, after myocardial infarction, with stable angina and positive exercise test (ET1) were divided into 2 groups: group A included 18 patients with the warm‑up effect, group B - 12 patients without this effect.