Boston Scientific Corporation CRMA20914 User Manual
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ECG Electrode RA should be placed 14 cm superior to the ECG Electrode LA, to represent the intended
position of the distal sensing tip of the implanted subcutaneous electrode. A 14 cm guide is located at
the bottom of the transparent screening tool.
Figure 4:
1. RECORD Supine + Standing
25 mm/s, 5-20 mm/mV
SIMULTANEOUS 3-LEAD ECG
Typical placement of surface ECG electrodes for patient screening
2.
Using a standard ECG machine, record 10 - 20 seconds of ECG using Leads I, II and III with a sweep speed of 25 mm/
sec and ECG gain between 5 - 20 mm/mV (use the largest ECG gain that does not result in clipping).
Note: It is important to establish a stable baseline when collecting the surface ECG. If a wandering baseline is noted,
ensure that the appropriate ground electrodes from the ECG machine are attached to the patient. To yield an acceptable
signal for testing, the gain may be adjusted for each ECG lead independently.
3.
Record ECG signals in at least two postures: (1) Supine and (2) Standing. Other postures may be collected including:
Seated, Left Lateral, Right Lateral, and Prone.
Note: If the S-ICD System is to be implanted with a concomitant pacemaker, all ventricular morphologies
Note: If the S-ICD System is to be implanted with a concomitant pacemaker, all ventricular morphologies
(paced and intrinsic, if normal conduction is expected) should be collected.
Evaluating the Surface ECG
Each surface ECG should be evaluated by analyzing at least 10 seconds of QRS complexes. If multiple morphologies are noted
Each surface ECG should be evaluated by analyzing at least 10 seconds of QRS complexes. If multiple morphologies are noted
(e.g., bigeminy, pacing, etc.), all morphologies should be tested as described below before the vector is deemed acceptable.