-
Notifications
You must be signed in to change notification settings - Fork 6
/
ecg_axis.m
30 lines (26 loc) · 1.48 KB
/
ecg_axis.m
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% BRAVEHEART - Open source software for electrocardiographic and vectorcardiographic analysis
% ecg_axis.m -- Calculates frontal plane QRS axis
% Copyright 2016-2024 Hans F. Stabenau and Jonathan W. Waks
%
% Source code/executables: https://github.com/BIVectors/BRAVEHEART
% Contact: braveheart.ecg@gmail.com
%
% BRAVEHEART is free software: you can redistribute it and/or modify it under the terms of the GNU
% General Public License as published by the Free Software Foundation, either version 3 of the License,
% or (at your option) any later version.
%
% BRAVEHEART is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
% without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
% See the GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License along with this program.
% If not, see <https://www.gnu.org/licenses/>.
%
% This software is for research purposes only and is not intended to diagnose or treat any disease.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function Raxis = ecg_axis(R1, S1, RF, SF)
RX = R1 - abs(S1);
% Correction for using the augmented unipolar lead and bipolar lead. See Novosel et al. Croat Med J. 1999 Mar;40(1):77-9. PMID: 9933900
RY = (2/sqrt(3)) * (RF - abs(SF));
Raxis = atan2d(RY,RX);