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Pacemaker: Difference between revisions
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→Commonly Used Pacemakers
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* '''DDDR''': as above, but the pacemaker has a sensor that records a demand for higher cardiac output and can adjust the heart rate accordingly. | * '''DDDR''': as above, but the pacemaker has a sensor that records a demand for higher cardiac output and can adjust the heart rate accordingly. | ||
* Biventricular pacemakers ('''CRT-D'''): leads in both ventricles are present to synchronize contraction. This cardiac synchronization therapy can improve symptoms and survival in some heart failure patients. | * Biventricular pacemakers ('''CRT-D'''): leads in both ventricles are present to synchronize contraction. This cardiac synchronization therapy can improve symptoms and survival in some heart failure patients. | ||
* '''[[ICD]]''' (Internal Cardioversion Device): this device can detect and treat [[ | * '''[[ICD]]''' (Internal Cardioversion Device): this device can detect and treat [[Ventricular Tachycardia]] and [[Ventricular Fibrillation]]. Usually the first treatment is anti-tachy pacing (pacing at a rate +- 10% above the ventricular rate in ventricular tachycardia, which can convert the rhythm to sinus rhythm). If this is not effective an defibrillator shock is delivered, usually with 16-36 Joules of energy. ICDs can save lives in patients who have a high risk of ventricular arrhythmias. All ICDs have optional pacemaker activity to treat bradycardias. New biventricular ICDs have 3 leads: an atrial lead, a left ventricular lead and a right ventricular lead. | ||
===Atrial-sensed ventricular-paced rhythm=== | ===Atrial-sensed ventricular-paced rhythm=== | ||