8-18 Infinity Vista VF6
8 ECG AND HEART RATE
High P-Waves and T-Waves
To obtain the most accurate heart rate count, do the following:
z Follow the steps outlined for pacemaker patients, selecting the lead with the
highest R-wave relative to the T-wave and the P-waves or both.
z If inaccurate counting continues, reposition the electrodes until you obtain an
acceptable waveform. In addition, Dräger recommends monitoring the heart
rate for these patients with an SpO
2
sensor.
Pacemakers
Take special care in the evaluation of ECG waveforms.The monitor successfully
passed the pacer pulse rejection test. However, it is not possible to anticipate every
waveform characteristic.
WARNING: The monitor may count high amplitude P or T-
waves (>0.2 mV) of long duration as QRS complexes. This can
result in missed low-rate alarms. If the displayed heart rate
(HR) is higher than that indicated by the waveform, the
monitor may be counting unusually high T-waves or P-waves
as QRS complexes.
WARNING: In case of uncertainty regarding the interpretation
of QRS complexes, the monitor is designed to err in the
direction of false positive rather than false negative alarms.
In paced patients, QRS complexes may not be counted,
resulting in false low-rate alarms under the following
circumstances:
z Fused beats and asynchronous pacers when coupling
intervals are +10 to –90 ms.
z 700 mV pacer pulses followed by QRS complexes
smaller than 0.5 mV.
z Asynchronous pacer pulses with overshoot.
To Next Page
Loading...
