We describe the electrocardiographic changes during everyday activities recorded by ambulatory electrocardiographic monitoring in 67 patients with neurocirculatory asthenia. The findings were compared with the results of ambulatory monitoring in 33 healthy controls. We observed episodes of sinus tachycardia > 120/min unrelated to effort in 60 of the patients, 35 had frequent episodes of pronoun...

purpose: patterned breathing allows standardized serial measurements of heart rate variability and baroreflex indices. the slow breathing augments these parameters, and regular exercises, including yoga breathing practices with even respiratory rates have long-term beneficial effects in cardiovascular diseases. the role of temporization of breathing phases, i.e. the ratio of expiration to inspi...

BACKGROUND: Cardiovascular system is a very importantorgan that plays a vital role in tissue function. In farm animals,the growth and high milk production depends on function ofcardiovascular system. OBJECTIVES: Cardiovascular health inhigh and low-yielding dairy cows was investigated. METHODS:Fifty 4-year-old high- yielding Holstein dairy cows and fifty 4-year-old low- yielding Holstein dairy ...

Two patients are presented who had suffered episodes of ischaemia of the brain-stem, mainly affecting one side of the pons. In addition to the more usual neurological signs, these two patients had cardiac arrhythmia: one had a sinus arrhythmia, the other a wandering pacemaker. In both patients the hemidiaphragm on the side ipsilateral to the lesion was transiently elevated. The mechanisms respo...

A new method for the analysis of heart rate variability in short-term recordings is presented which consists of an analysis of the respiratory sinus arrhythmia in the time domain by means of a polar representation. Its main advantage is that it is applicable in experiments in which the respiration of the subject is not controlled. The algorithm is applied to data recorded on two astronauts duri...

Respiratory Sinus Arrhythmia has until now been analysed manually by reviewing long time series of heart rate measurements. Patterns are identified in the analysis of the measurements. We propose a design for a classification system of Respiratory Sinus Arrhythmia by time series analysis of heart and respiration measurements. The classification uses Case-Based Reasoning and Rule-Based Reasoning...

Systemic and coronary hemodynamic parameters were determined during an arrhythmia and immediately after a direct current transthoracic shock given in an attempt to convert the arrhythmia to a sinus mechanism. No anesthesia or drugs were administered between the two studies. 16 patients with atrial fibrillation converted to sinus rhythm and five did not. In two patients with atrial flutter and o...

BACKGROUND The purpose of this study was to determine the rate and causes of inappropriate rhythm detection, and to compare adequacy of ventricular arrhythmia detection by single-chamber and dual-chamber cardioverter-defibrillators (ICD). METHODS We evaluated 190 patients (age 57.2 +/- 11.2 years) with ICD. FOLLOW-UP 34.3 +/- +/- 22 months. Dual-chamber ICD was used in 54 patients. RESULT...