Pacemaker Learning Package
Intensive Care: Learning Packages Intensive Care Unit Pacemaker Learning Package
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Intensive Care: Learning Packages Intensive Care Unit Pacemaker Learning Package LH_ICU2016_Learning_Package_Pacemaker_Learning_Package 7 | P a g e Figure 2: Cardiac conduction system. Marquette, K.H. Impulses can occur in various sites within the heart. Heart rate is determined by the Nodal and Purkinje cells with the fastest firing rate. Normally, the SA node has the highest inherent rate, 60 to100 impulses/minute. The AV node has an inherent rate of 40 to 60 impulses/minute Ventricular pacemaker sites have the lowest inherent rate, of 30 to 40 impulses/minute. If the SA node malfunctions, the AV node generally takes over the heart's pacemaker function at its inherently lower rate. Should both the SA and the AV nodes fail in their pacemaker function, a pacemaker site in the ventricle will fire at its inherent bradycardic rate of 30 to 40 impulses/minute. It is when one or both of these nodes fail that a temporary pacemaker may be needed. Electrical activity of the heart is recorded on the ECG Liverpool Hospital Intensive Care: Learning Packages Intensive Care Unit Pacemaker Learning Package LH_ICU2016_Learning_Package_Pacemaker_Learning_Package 8 | P a g e Figure 3: Electrical representation and cardiac cycle. Marquette, K.H Liverpool Hospital Intensive Care: Learning Packages Intensive Care Unit Pacemaker Learning Package LH_ICU2016_Learning_Package_Pacemaker_Learning_Package 9 | P a g e tải về 1.43 Mb. Chia sẻ với bạn bè của bạn:
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