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Effect of Pentaphasic Pulse Sequence as an Impedance Sensor on Standard Electrocardiographic Recordings
Author(s) -
MORTAZAVI SAID,
PARK EULJOON,
FLORIO JOSEPH,
POORE JOHN,
BORNZIN GENE,
LEVINE PAUL A.,
SHOLDER JASON
Publication year - 1996
Publication title -
pacing and clinical electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.686
H-Index - 101
eISSN - 1540-8159
pISSN - 0147-8389
DOI - 10.1111/j.1540-8159.1996.tb03205.x
Subject(s) - emi , medicine , electromagnetic interference , electrical impedance , pulse (music) , high impedance , signal (programming language) , biomedical engineering , acoustics , electronic engineering , electrical engineering , voltage , computer science , engineering , physics , programming language
Two advances in cardiac pacing have resulted in an internal conflict in some pacemakers. One is the development of a standard lead physiological sensor and the other is protection from electromagnetic interference (EMI). One popular type of standard lead sensor uses sub‐threshold pulses to measure intracardiac and intrathoracic impedance changes, i.e., minute ventilation. Recent clinical observations and extensive in vitro testing have verified that digital cellular phones can be troublesome. Large feedthrough capacitors (FCs), effective in blocking the EMI, will preclude sensing of the standard impedance‐based signals. A variety of pulse configurations were studied that might be effective for a sensor‐based impedance signal while allowing the pacemaker to continue to use large Fcs protecting them from environmental EMI. In comparison to both monophasic and biphasic pulse sequences, a pentaphasic pulse sequence was effective as an impedance sensor, still allows large FCs to function as an effective filter for environmental EMI, and would not produce artifacts on surface ECG.