ZOLL E Series Monitor Defibrillator Rev G 12 Lead - Manual (Page 13)

Daily Operational Verification
9650-1213-01 Rev. G 11
Reviewing an ECG
ECG data can be viewed in three different ways:
• ECG Strip — The unit displays a 12-lead strip with 10
seconds of ECG data, in four staggered 2.5 second
segments. For more information, see “4x3 Format”
on page 8.
• Interpretation — The unit displays the results of
interpretation of the ECG recording by the 12SL
program.
• Measurements — The unit displays measurements
based on all 12 leads.
The global measurements include heart rate, PR
interval, QRS duration, QT, QTc, P axis, QRS axis, and
T axis. These measurements are described as follows:
Following the global measurements table is a table of
lead-specific measurements for the standard 12-leads.
Measurement Description
Heart Rate Frequency is shown in beats per minute.
Normal range is 60-100.
PR Interval This time interval is between beginning
of P wave and beginning of QRS
complex. It is sometimes referred to as
PQ duration. Smaller values indicate
premature excitation of the ventriculars;
larger values indicate conduction defects
in the atrioventricular (AV) node.
QRS Duration Duration of the QRS complex in
milliseconds. Larger values indicate
ventricular conduction defects.
QT, QTc
Duration Time in milliseconds from beginning of
QRS complex to end of T wave. The QTc
value is QT corrected for heart rate to
estimate the value it would have been if
the heart rate were 60 beats per minute.
Abnormal values can be due to
electrolyte imbalances or drugs: short
QT due to hyperkalaemia, long QT due
to hypocalcemia, or quinidine-like drugs
(procainamide, amiodarone).
P-axis This is the axis of the P wave in
degrees.
QRS axis This is the axis of the QRS complex.
Smaller than -30 is called left axis
deviation; larger than 90 is right axis
deviation. Deviations can be due to
conduction blocks or hypertrophy.
T-axis This is the axis of the T-wave.
* All amplitudes are in µV (microvolts) or mm (at 10mm/mV)
depending on the system setup.
For interpretation of these results, see the 12SL ECG
Analysis Program Physician’s Guide (
P/N 3001-0203 ).
Daily Operational Verification
Perform these steps daily to ensure proper operation of
the E Series unit and 12-lead option. You will need either
a 12-lead simulator or a volunteer “patient”.
1. Connect the V-lead cable to the 12-lead cable.
2. Connect the lead wires of the 12-lead cable and V-
leads to the patient or simulator. If connecting to a
patient, place ECG electrodes as indicated in
“Electrode Placement” on page 3.
3. Connect the 12-lead cable to the connector located on
the rear of the E Series.
4. Turn the E Series selector switch to MONITOR.
5. Select a normal sinus rhythm on the simulator (if
using).
6. Press the LEAD button to cycle through each of the 12
leads.
7. Verify that good quality, artifact-free ECG signals are
displayed and stabilized within 10 seconds on your
E Series unit.
8. Verify ECG LEAD OFF is NOT displayed on the
screen.
9. Verify LOW BATTERY is NOT displayed on the
screen.
10.Verify the filter setting is set for 0.05 - 40 Hz (4x3).
11.Press and hold the RECORDER button for 3 seconds.
12.Verify appropriate ECG signals are printed. See
“12-Lead Reports” on page 7 for reference.
13.Verify accuracy of time and date printed on the strip.
14.Visually inspect ECG cable snaps for corrosion,
particularly on the retaining wire inside the snap.
Measurement Description
PA, PPA* These values are the minimum and
maximum values of the P wave.
QA, RA, SA* These values represent the absolute
amplitude of the indicated wave.
STJ ST level at J-point.
STM, STE These are the ST levels at the middle
and end point of the wave respectively.
TA, TPA* These are the minimum and maximum
values of the T wave.
QD, RD, SD These represent the duration of the
indicated wave in milliseconds.
RPA, RPD,
SPA* These are measurements that reflect the
amplitude (RPA & SPA) and duration
(RPD) of secondary R and S waves that
may appear with RSR patterns such as
right or left bundle branch block.