Heart Rate graph
The blue graph depicts the measured heart rate in beats per minute. If you hover over this graph with your cursor, you will see the heart rate value at that point of time. It is also possible to zoom in on the graph. Click and drag in the plot area to zoom in. Some notifications might be visible in this graph. Seizure alarms are depicted as red alarm bells in the graph and other notifications reported by the NightWatch are shown as blue info icons.
The seizure alarms can consist of the following:
• Motion 1 = Subtle motions detected which might relate to epileptic activity
• Motion 2 = Motions detected which might relate to epileptic activity
• Motion 3 = Wild motions detected which might relate to epileptic activity
• Heart rate increase = The heart rate rose suspiciously fast
• Tachycardia = The current heart rate is suspiciously high
• Bradycardia = The current heart rate is suspiciously low
The technical notifications can consist of the following:
• Unable to detect heart rate = There has not been a reliable heart rate signal for a while.
• Bracelet connection lost = Bracelet is out of reach or is switched off
• Bracelet battery Low = The battery of the bracelet is running low
The green graph shows the intensity of motions detected by the sensor. The intensity of the motion graph is measured by shivering movements and the speed of these movements. If the shivering movement is subtle, the graph will reach a lower value than when the sensor is shaken wildly. The degree of intensity is indicated on a 1-20 scale.
When the wearer of the NightWatch is putting on the bracelet, the NightWatch will stay in low sensitivity mode until the wearer will go to sleep. When the wearer of the NightWatch is sleeping and the bracelet is detecting a horizontal position of the body, the NightWatch algorithms function at full capacity. The graph in the portal will show ‘High Sensitivity’ at these moments and the base station of the NightWatch will show a continuous green LED, showing that the algorithms are fully active.
When the wearer temporarily gets up or leaves the bed, most of the algorithms will temporarily be disabled, until the bracelet detects that the wearer is lying down and sleeping again. This is designed in order to reduce the false alarm rates, induced by normal human activity while being awake. This low sensitivity state is shown in the graph as ‘Low Sensitivity’ and the base station will show a green flashing LED while being in this state. When in 'High Sensitivity' the base station will show a continuous green LED.
If you see too many Low sensitivity periods while someone is sleeping, repositioning the bracelet (based on the wearers sleeping characteristics) often helps to improve the sensitivity of the recordings. If you need any help with this, please contact us.