How to use multiple filters for filtering a signal

Hi.

I have a question. I have an ECG signal that needs filtering and we have to use a high pass low pass and a stop band filter with the command fir1. For the filter design I get the following commands.

% x is the original signal

fs=1000;

FcutoffH=180; % cutoff frequency of the filter

FcutoffL=1.4;

Fband=60;

w=Fband/fN;

wn=[w-0.001 w+0.001];

wnL=FcutoffL/fN;

wnH=FcutoffH/fN; % normalised cutoff frequency

filtorder=68;

bH=fir1(filtorder,wnH,'high');

bL=fir1(filtorder,wnL,'low');

band=fir1(filtorder,wn,'stop');

a=1;

and for the actual filtering i am using the following.

xL=filter(bL,a,x);

xH=filter(bH,a,x);

xB=filter(band,a,x);

The question is how to combine these signals in order to get the overall filtered one?