I am using spline chart to plot the ECG graph.

var data = [];
var axesOptions = {
    tickInterval: 125,
    minorTicks: true,
    minorTickInterval: 0.1,
    gridLineWidth: 1,
    gridLineColor: 'green'
};

var chart = Highcharts.chart('container', {

    xAxis: axesOptions,
    yAxis: axesOptions,

    series: [{
        name: 'ECG data',
        marker: {
            enabled: false
        },
        data: []
    }]
});

About 125 points come from ECG sensor every second. I'm trying to create a graph similar to the image below.

I used the addpoint function as below, but it doesn't work as I want.

for (var k = 0; k < data.lenght; k++) {
    chart.series[0].addPoint(data[k], true, true, { duration: 1 / data.lenght });
}

Any help is really appreciated thanks.