Heart rate variability: for real doctors. Translation from the Russian version of the book, published at Kharkiv, 2010, 131 p.
The basics and practice of the clinical use of the technology of heart rate variability are outlined for doctors of all specialties and students of medical faculties of universities.
Limitations on the application of technology HRV
In accordance with the recommendations when using the HRV technology, sections of the sinus rhythm rhythmogram free from extrasystoles are analyzed. A small number (up to 3 per minute) of extrasystoles is allowed, if the instrument used has special procedures for replacing extrasystolic complexes with “normal” complexes (hence the concept of NN-intervals as equivalent to RR-intervals, where extrasystolic complexes are replaced by given sinus or normal).
In clinical applications today, diagnostics using standard HRV procedures do not recommend exposing more frequent extrasystoles, paroxysmal tachycardia, atrioventricular block, pacemaker migration, atrial flutter, other rhythm disturbances and, equally important, transient processes.
Limitations can be relaxed with precision, as we mentioned in the previous chapter on atrial fibrillation and flutter. Episodes of a non-sinus rhythm with one obligatory condition can be investigated – the conclusions will be applied only to these episodes and will be made only in terms of indicators of spectral analysis, but not regulation, which HRV reflects on episodes of sinus rhythm only.