Noninvasive Pacing Therapy (Optional)
M4735A Heartstream XL Defibrillator/Monitor 1-7
1
Noninvasive Pacing Therapy (Optional)
The M4735A Heartstream XL Defibrillator/Monitor provides noninvasive
transcutaneous pacing by delivering a monophasic, electrical stimulus to the
heart. This stimulus is intended to cause cardiac depolarization and myocar-
dial contraction. The medical care provider selects the stimulus current and
rate settings. The energy is delivered through multifunction defib electrode
pads applied to the patient’s bare chest.
Indications
Noninvasive pacing is one method of treating patients with symptomatic
bradycardia. It can also be helpful in patients with asystole, if performed
early.
Contraindications
Noninvasive pacing is contraindicated in the treatment of ventricular fibrilla-
tion. Noninvasive pacing in the presence of severe hypothermia may be con-
traindicated.
SpO
2
Monitoring (Optional)
A pulse oximeter is a noninvasive device that indicates the oxygen saturation
(SpO
2
) of arterial blood. This measurement is obtained through a probe that
directs red and near infrared light through arterial beds. Hemoglobin absorbs
these lights differently when it is bound with oxygen. Pulse oximetry mea-
sures this difference and translates the measurement into a saturation percent-
age that is displayed as an SpO
2
reading.
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