title: The Cardiac Rhythms: A Systematic Approach to Interpretation
author:  Raymond E. Phillips 
description: Proceeding from an elementary to intermediate level, this book offers a method for learning disorders of the heartbeat from an electrocardiogram. The user learns the dynamics of the autonomic nervous system; cardiac drugs are integrated throughout the text. This text has been virtually rewritten to accommodate the tremendous number of advances in cardiac arrhythmias. Rhythms caused by re-entrant mechanisms and electronic pacemaker rhythms are amongst the most heavily revised sections.
zlib_text: 1
  SCIeNTIfIC REpoRTS |  (2018) 8:2663  | DOI:10.1038/s41598-018-20932-x
  www.nature.com/scientificreports
  Long-Term Study of Heart Rate 
  Variability Responses to Changes 
  in the Solar and Geomagnetic 
  Environment
  Abdullah Alabdulgader1, Rollin McCraty2, Michael Atkinson2, York Dobyns2,  
  Alfonsas Vainoras3, Minvydas Ragulskis4 & Viktor Stolc5
  This long-term study examined relationships between solar and magnetic factors and the time course 
  and lags of autonomic nervous system (ANS) responses to changes in solar and geomagnetic activity. 
  Heart rate variability (HRV) was recorded for 72 consecutive hours each week over a five-month 
  period in 16 participants in order to examine ANS responses during normal background environmental 
  periods. HRV measures were correlated with solar and geomagnetic variables using multivariate linear 
  regression analysis with Bonferroni corrections for multiple comparisons after removing circadian 
  influences from both datasets. Overall, the study confirms 