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6Manual Defibrillation
and Cardioversion
This chapter explains how to prepare for and perform asynchronous and synchronous (cardioversion)
defibrillation using multifunction electrode pads, external paddles, and internal paddles.
NOTE Defibrillation is always performed through paddles or pads. However, during defibrillation you may
choose to monitor the ECG using an alternate ECG source (3-, 5-, or 10-lead monitoring electrodes).
If an alternate ECG source is connected, any available lead may be displayed.
For information on monitoring optional measurements while in Manual Defib Mode, see the
corresponding chapters in these Instructions for Use.
Overview
Defibrillation therapy is the definitive method for termination of a variety of potentially fatal
arrhythmias. The HeartStart MRx provides this therapy through the application of a brief biphasic
pulse of electricity to the cardiac muscle. This electrical energy is transferred through attached paddles
or disposable multifunction electrode pads applied to the patient’s bare chest. Internal paddles for
open-chest intrathorasic defibrillation can also be used.
In Manual Defib Mode, you must assess the ECG, decide if defibrillation or cardioversion is indicated,
select the appropriate energy setting, charge the monitor/defibrillator, and deliver the shock. The entire
defibrillation process is under your control. Voice prompts are not present. However, text messages on
the display provide relevant information throughout the process. It is important to be attentive to these
messages when displayed.
The ECG strip and Event Summary are easily annotated with event information using the Mark Event
function button. See “Marking Events” on page 212 for more information.
Monitoring alarms are available in Manual Defib Mode, however, they are turned off once an energy is
selected for defibrillation unless Sync is active. Alarms may be turned on in Manual Defib Mode by
pressing the Alarm Pause button. Alarms are also reactivated once the Therapy Knob is moved to
Monitor or Pacer or Sync is selected.
When an energy is selected, automatic NBP measurements are discontinued. If a manual NBP
measurement is requested by pressing the [Start NBP] soft key, the NBP information, including
the current schedule, is displayed in its normal position, and scheduled NBP measurements resume.
NOTE The use of Manual Defib Mode may be password protected, as defined in Configuration. See
“Password Security” on page 15.
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