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ECG
AND
HR S
AFETY
C
ONSIDERATIONS
VF6 Infinity Vista 8-15
ECG and HR Safety Considerations
HR Alarm Settings
Set HR alarm limits on the Alarm Limits table (see the chapter Alarms and Messages ).
If you turn the HR alarm off, the monitor displays a crossed bell icon in the HR
parameter box and the banner
HR Limits Off
above the first waveform channel. If
arrhythmia monitoring and alarms for asystole and ventricular fibrillation are also
disabled, the monitor displays the banner
HR, ASY, VF, Off .
Neonatal ECG Monitoring
To obtain the most accurate heart rate count and waveform display, select the ECG
lead(s) with the smallest T wave and the largest monophasic QRS.
ECG 50/60 Hz Notch Filter Setting
When the line frequency is set incorrectly, the resulting 50 or 60 Hz noise on the ECG
signal can make the ECG waveform unreadable along with masking QRS complexes.
As a result, detection of the QRS complexes becomes unreliable. When these cannot
be sensed reliably, incorrect HR calculations may result, leading to both false positive
and false negative HR alarms.
Muscle Stimulators
NOTE:
z
If arrhythmia detection is on, alarms for asystole (ASY) and ventricular
fibrillation (VF) are automatically on and cannot be turned off.
z
By default, alarms for asystole and ventricular fibrillation are always on;
however, these alarms can be disabled in the password-protected Biomed menu
(see the appendix
Default Settings and Biomedical Support ).
WA R N I N G : I f t h e m o n i t o r d i s p l a y s t h e b a n n e r H R , A S Y, V F
O ff , t h e r e i s n o a l a r m a n n u n c i a t i o n f o r a s y s t o l e a n d
v e n t r i c u l a r f i b r i l l a t i o n .
WA R N I N G : N e o n a ta l Q R S c o m p l e x e s t h a t a r e b i p h a s i c a n d
l e s s t h a n 4 0 m s w i d e , o r m o n o p h a s i c a n d l e s s t h a n 2 0 m s
w i d e , a r e d i s p l a y e d s m a l l e r t h a n t h e i r a c t u a l a m p l i t u d e .
WA R N I N G : T h e u s e o f e l e c t r i c a l m u s c l e s t i m u l a t o r s m a y
i n t e r f e r e w i t h E C G a n d r e s p i r a t i on m o n i t o r i n g . I f t h i s o c c u r s ,
d i s c o n t i n u e t h e i r u s e .