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Ventricular Pacing example one



In this strip, we see pacer spikes followed by wide QRS complexes that
resemble PVCs.  This is ventricular pacing at its most simple.  There is an
interval of 0.60 seconds between the pacer spikes, which produces a heart
rate of 100 beats per minute.  This rate is higher than usual.  It may be that
the pacer was programmed at this rate to eliminate undesirable beats (such
as frequent non-perfusing PVCs) that occur when the R-R interval is longer
than 0.60 seconds.  Or, perhaps this patient has a small stroke volume and
needs a rate of 100 for adequate cardiac output.  The pacer is in VOO mode
(Ventricular stimulating, no sensing, no response) or VVI (Ventricular
stimulating, Ventricular sensing, Inhibition in response) mode; with no native
beats visible we can't be certain.