Pacing the Heart Ayo Ositelu ECE 5030 Final Presentation Tuesday, 15 December 1:00pm.

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Presentation transcript:

Pacing the Heart Ayo Ositelu ECE 5030 Final Presentation Tuesday, 15 December 1:00pm

Outline Background Main Features New Features

The Cardiac Action Potential Ellenbogen, Kay, and Wilkoff. Clinical Cardiac Pacing, pg 7.

Natural Pacemakers of the Heart Ellenbogen, Kay, and Wilkoff. Clinical Cardiac Pacing, pg 8.

Two Schools of Thought Current density theory “The critical factor required to induce a regenerative wave front of depolarization is the magnitude of current flowing through a given mass of myocardium…” Electric Field Theory “The critical factor affecting myocardial depolarization is the magnitude of the electric field that is induced in the myocardium…”

History Hyman’s Pacemaker of 1932Accompanying Flow Diagram

Components Pacemaker Leads Pulse Generator Power Source (not discussed)

Pacemaker Leads “The leads are the only link between the sophisticated electronics in the pulse generator and the heart.” Relevant Issues: Polarization, electrode porosity, electrode composition, the electrode-tissue interface, etc. Clinical Cardiac Pacing, pg 70.

Pacemaker Leads Ellenbogen, Kay, and Wilkoff. Clinical Cardiac Pacing, pg 74, 75.

Pacemaker Leads Ellenbogen, Kay, and Wilkoff. Clinical Cardiac Pacing, pg 86.

Pulse Generator Pacing therapy controller Output amplifiers Sense amplifiers Diagnostic subsystem

Pulse Generator Ellenbogen, Kay, and Wilkoff. Clinical Cardiac Pacing, pg 113, 114.

New Features Sensing Telemetry Improved SNR

Rate-Adaptive Sensors Activity-Sensing Rate-Adaptive Sensors Rate-Modulated Pacing Controlled by Mixed Venous Oxygen Saturation Temperature-Controlled Rate-Adaptive Pacing Rate-Adaptive Pacing Controlled by Dynamic Right Ventricular Pressure (dP/dtmax) Rate-Adaptive Pacing Based on Impedance- Derived Minute Ventilation, etc.

Rate-Adaptive Sensors Kristensson, et al.

Activity-Sensing Sensors Ellenbogen, Kay, and Wilkoff. Clinical Cardiac Pacing, pg 168, 169.

Activity-Sensing Sensors Ellenbogen, Kay, and Wilkoff. Clinical Cardiac Pacing, pg 171.

Activity-Sensing Sensors Ellenbogen, Kay, and Wilkoff. Clinical Cardiac Pacing, pg 171.

Activity-Sensing Sensors Ellenbogen, Kay, and Wilkoff. Clinical Cardiac Pacing, pg 171.

Rate-Adaptive Venous Oxygen Sensor Ellenbogen, Kay, and Wilkoff. Clinical Cardiac Pacing, pg 188.

Rate-Adaptive Venous Oxygen Sensor Ellenbogen, Kay, and Wilkoff. Clinical Cardiac Pacing, pg 192.

Rate-Adaptive Venous Oxygen Sensor Ellenbogen, Kay, and Wilkoff. Clinical Cardiac Pacing, pg 192.

Temperature-Controlled Sensor Ellenbogen, Kay, and Wilkoff. Clinical Cardiac Pacing, pg 202.

Temperature-Controlled Sensor Ellenbogen, Kay, and Wilkoff. Clinical Cardiac Pacing, pg 203.

Temperature-Controlled Sensor Ellenbogen, Kay, and Wilkoff. Clinical Cardiac Pacing, pg 203.

Temperature-Controlled Sensor Ellenbogen, Kay, and Wilkoff. Clinical Cardiac Pacing, pg 206.

Temperature-Controlled Sensor Fearnot, et al.

Manufacturer Overview Biotec, S.P.A., Bologna, Italy Biotronik, GmbH & Co., Berlin, Germany Cardiac Pacemakers Inc., St. Paul, MN Cook Pacemakers Corporation, Leechburg, PA Ela Medical, Rougermont, France Intermedics Inc., Angleton, TX Medtronic Inc., Minneapolis, MN

Manufacturer Overview Siemens Ltd., Solna, Sweden Sorin Biomedica, Saluggia, Italy St. Jude Medical, Inc, St. Paul, MN Telectronics Pacing Systems, Englewwod, CO Vitatron Medical B.V., Dieren, The Netherlands.

Manufacturer Overview Ellenbogen, Kay, and Wilkoff. Clinical Cardiac Pacing, pg 144.

Telemetry “Telemetry involves the transmission of information from the pulse generator to an external programmer.” Battery voltage and impedance, stimulus current, voltage, and energy, lead resistance, intracardiac electrograms, and stored histograms of pace and sensed data retrievable from telemetry

Telemetry Medtronic CareLink® Network Monitoring Device Biotronik Home Monitoring®

Improving SNR Federica Censi, et al. studying the effects of electromagnetic interference on pacemakers. RF feedthrough filters

References Ellenbogen KA, Kay GN, Wilkoff BL. Clincial Cardiac Pacing. W.B. Saunders Company. Philadelphia pg 3—276. Fearnot, NE et al. Heart Rate Correlation, response time, and effect of previous exercise using advanced pacing rate algorithm for temperature-based rate modulation. PACE (11): , Kristensson B, et al. Holter-monitored heart rhythm during atrioventricular synchronous and fixed-rate Ventricular pacing. PACE (9): 511, Censi, F, et al. Interference between mobile phones and pacemakers: a look inside. Ann Ist Super Sanita, Vol. 43, 3: 254—259. Hayes, DL and Vliestra RE. Pacemaker Malfunction. Ann Internal Medicine. 1993; 119: 828—835.