Page 8-20 Infinity Gamma Series VF4
To obtain the most accurate heart rate count, do the following:
! 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.
! 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.
WARNIN G: In case of uncertainty regarding the inter-
pretation of QRS complexes, the monitor is designed to
err in the direction of false positive rather than false neg-
ative alarms. In paced patients, QRS complexes may not
be counted, resulting in false low-rate alarms under the
following circumstances:
! Fused beats and asynchronous pacers when cou-
pling intervals are +10 to –90 ms.
! 700 mV pacer pulses followed by QRS complexes
smaller than 0.5 mV.
! Asynchronous pacer pulses with overshoot.
The monitor successfully passed the pacer pulse rejection test.
However, it is not possible to anticipate every waveform charac-
teristic.
WARNIN G: The monitor may not count heart rates
accurately and may misinterpret rate-dependent arrhyth-
mia in some paced patients. Do not rely entirely on the
displayed heart rate to assess a paced patient’s condi-
tion. Always observe these patients closely and monitor
all of their vital signs carefully.
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