TY  - CHAP
M1  - Book, Section
TI  - Heart Rate
A1  - Zimmerman, Franklin H.
PY  - 2023
T2  - ECG Core Curriculum
AB  - It’s  finally  time  to  start  making  real  measurements,  so  let’s  begin  by  learning  how  to  calculate  the  heart  rate  (HR).  For  every  ECG,  you  should  calculate  both  the  ventricular  rate  and  atrial  rate.  We  can  calculate  the  ventricular  rate  by  measuring  the  time  between  the  QRS  complexes  (R-R  intervals),  and  the  atrial  rate  by  measuring  the  time  between  the  P  waves  (P-P  intervals).  In  normal  sinus  rhythm  the  atrial  and  ventricular  rates  are  identical.  In  patients  with  cardiac  arrhythmias,  the  atrial  and  ventricular  rates  may  be  very  different,  something  we  are  going  to  learn  in  subsequent  chapters.  For  the  following  discussion  we  will  concentrate  on  the  R  waves  to  calculate  the  ventricular  rate,  but  the  same  principles  apply  when  using  the  P  waves  to  calculate  the  atrial  rate.  There  are  a  number  of  different  methods  that  you  can  use,  but  I  will  present  them  in  the  order  I  find  most  practical.  
SN  - 
PB  - McGraw Hill Education
CY  - New York, NY
Y2  - 2024/04/20
UR  - accesscardiology.mhmedical.com/content.aspx?aid=1200099885
ER  -