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Papers by Fr. Stephen Lattner OSB

Research paper thumbnail of Undersensing of P Waves in the Presence of an Adequate P Wave Due to Automatic Postventricular Atrial Refractory Period Extension

Pacing and Clinical Electrophysiology, 1989

WILSON, J.H., et al.: Undersensing of P Waves in the Presence of an Adequate P Wave Due to Automa... more WILSON, J.H., et al.: Undersensing of P Waves in the Presence of an Adequate P Wave Due to Automatic Postventricular Atrial Refractory Period Extension Two cases in which a DDD pacemaker failed to track P waves due to repetitive activation of the automatic postventricular atrial refractory period (PVARP) extension are reported. In one case, the cycle was initiated by a premature ventricular contraction (PVC); in the other, by touching the unipolar pacemaker with a needle while suturing. We demonstrated that chest wall stimulation can be used to induce cycles of repetitive automatic PVARP extension and failure to track P waves. We demonstrated in vitro that touching a unipolar pacemaker with a needle can generate a signal suffiicient to mimic a QRS complex, and initiate a cycle of repetitive P wave undersensing.

Research paper thumbnail of Impedance of Pacemaker Leads: Correlation of Different Methods

Pacing and Clinical Electrophysiology, 1996

SIEGMUND, J.B., ET AL.: Impedance of Pacemaker Leads: Correlation of Different Methods. This stud... more SIEGMUND, J.B., ET AL.: Impedance of Pacemaker Leads: Correlation of Different Methods. This study compares three different pacing system analyzers, which measure impedance at different points during an impulse, with measurements telemetered from implanted pacemakers from four different manufacturers. Measurements were obtained at the time of implantation in a group of 103 patients. The measurements obtained by these different methods differ significantly from each other; the later during the impulse the impedance is measured, the higher in general its value. Interpretation of impedance values should take into account the technique of measurement.

Research paper thumbnail of Pacing System Analyzers: Different Systems—Different Results

Pacing and Clinical Electrophysiology, 1994

When a pacemaker is implanted, several electrophysiological parameters are measured using pacing ... more When a pacemaker is implanted, several electrophysiological parameters are measured using pacing system analyzers (PSA). Different PSAs may use different filter settings and measuring techniques when compared to the implanted pacemaker. In order to determine if there were significant differences in measurements obtained with different PSAs, we obtained measurements in a group of 99 patients with three different PSAs and a manual method. The results show that with each of the three different PSAs tested, different amplitudes of intracardiac electrograms are obtained and that they are usually higher than those obtained by manual measurement of recorded electrograms. Despite significant differences, however, all methods correlate well with each other. Following common practice of pacemaker programming, the use of a PSA for the implantation of a pacemaker that uses different sensing technique does not lead to clinical complications.

Research paper thumbnail of Electrocautery does not interfere with the function of the automatic implantable cardioverter defibrillator

The Annals of Thoracic Surgery, 1991

Research paper thumbnail of Electrocautery does not interfere with the function of the automatic implantable cardioverter defibrillator

The Annals of Thoracic Surgery, Feb 1, 1991

Research paper thumbnail of Undersensing of P Waves in the Presence of an Adequate P Wave Due to Automatic Postventricular Atrial Refractory Period Extension

Pacing and Clinical Electrophysiology, Nov 1, 1989

Research paper thumbnail of Apparent Undersensing Due to Oversensing of Low Amplitude Pulses in a Thoracic Impedance-Sensing, Rate-Responsive Pacemaker

Pacing and Clinical Electrophysiology, Oct 1, 1988

Research paper thumbnail of Apparent Undersensing Due to Oversensing of Low Amplitude Pulses in a Thoracic Impedance‐Sensing, Rate‐Responsive Pacemaker

Pacing and Clinical Electrophysiology, 1988

A case in which apparent undersensing was caused by detection of low amplitude impedance‐measurin... more A case in which apparent undersensing was caused by detection of low amplitude impedance‐measuring pulses emitted by a thoracic impedance‐sensing rate‐modulated pacemaker is described. The detection of these high frequency pulses was interpreted as “noise” by the pacemaker and led to asynchronous pacing in the interference reversion mode. Increasing the sensitivity /ailed to correct the problem. Decreasing the sensitivity eliminated oversensing of the low amplitude pulses and the apparent undersensing. Recognition of (his phenomenon is important to prevent a misdiagnosis of undersensing.

Research paper thumbnail of Undersensing of P Waves in the Presence of an Adequate P Wave Due to Automatic Postventricular Atrial Refractory Period Extension

Pacing and Clinical Electrophysiology, 1989

WILSON, J.H., et al.: Undersensing of P Waves in the Presence of an Adequate P Wave Due to Automa... more WILSON, J.H., et al.: Undersensing of P Waves in the Presence of an Adequate P Wave Due to Automatic Postventricular Atrial Refractory Period Extension Two cases in which a DDD pacemaker failed to track P waves due to repetitive activation of the automatic postventricular atrial refractory period (PVARP) extension are reported. In one case, the cycle was initiated by a premature ventricular contraction (PVC); in the other, by touching the unipolar pacemaker with a needle while suturing. We demonstrated that chest wall stimulation can be used to induce cycles of repetitive automatic PVARP extension and failure to track P waves. We demonstrated in vitro that touching a unipolar pacemaker with a needle can generate a signal suffiicient to mimic a QRS complex, and initiate a cycle of repetitive P wave undersensing.

Research paper thumbnail of Impedance of Pacemaker Leads: Correlation of Different Methods

Pacing and Clinical Electrophysiology, 1996

SIEGMUND, J.B., ET AL.: Impedance of Pacemaker Leads: Correlation of Different Methods. This stud... more SIEGMUND, J.B., ET AL.: Impedance of Pacemaker Leads: Correlation of Different Methods. This study compares three different pacing system analyzers, which measure impedance at different points during an impulse, with measurements telemetered from implanted pacemakers from four different manufacturers. Measurements were obtained at the time of implantation in a group of 103 patients. The measurements obtained by these different methods differ significantly from each other; the later during the impulse the impedance is measured, the higher in general its value. Interpretation of impedance values should take into account the technique of measurement.

Research paper thumbnail of Pacing System Analyzers: Different Systems—Different Results

Pacing and Clinical Electrophysiology, 1994

When a pacemaker is implanted, several electrophysiological parameters are measured using pacing ... more When a pacemaker is implanted, several electrophysiological parameters are measured using pacing system analyzers (PSA). Different PSAs may use different filter settings and measuring techniques when compared to the implanted pacemaker. In order to determine if there were significant differences in measurements obtained with different PSAs, we obtained measurements in a group of 99 patients with three different PSAs and a manual method. The results show that with each of the three different PSAs tested, different amplitudes of intracardiac electrograms are obtained and that they are usually higher than those obtained by manual measurement of recorded electrograms. Despite significant differences, however, all methods correlate well with each other. Following common practice of pacemaker programming, the use of a PSA for the implantation of a pacemaker that uses different sensing technique does not lead to clinical complications.

Research paper thumbnail of Electrocautery does not interfere with the function of the automatic implantable cardioverter defibrillator

The Annals of Thoracic Surgery, 1991

Research paper thumbnail of Electrocautery does not interfere with the function of the automatic implantable cardioverter defibrillator

The Annals of Thoracic Surgery, Feb 1, 1991

Research paper thumbnail of Undersensing of P Waves in the Presence of an Adequate P Wave Due to Automatic Postventricular Atrial Refractory Period Extension

Pacing and Clinical Electrophysiology, Nov 1, 1989

Research paper thumbnail of Apparent Undersensing Due to Oversensing of Low Amplitude Pulses in a Thoracic Impedance-Sensing, Rate-Responsive Pacemaker

Pacing and Clinical Electrophysiology, Oct 1, 1988

Research paper thumbnail of Apparent Undersensing Due to Oversensing of Low Amplitude Pulses in a Thoracic Impedance‐Sensing, Rate‐Responsive Pacemaker

Pacing and Clinical Electrophysiology, 1988

A case in which apparent undersensing was caused by detection of low amplitude impedance‐measurin... more A case in which apparent undersensing was caused by detection of low amplitude impedance‐measuring pulses emitted by a thoracic impedance‐sensing rate‐modulated pacemaker is described. The detection of these high frequency pulses was interpreted as “noise” by the pacemaker and led to asynchronous pacing in the interference reversion mode. Increasing the sensitivity /ailed to correct the problem. Decreasing the sensitivity eliminated oversensing of the low amplitude pulses and the apparent undersensing. Recognition of (his phenomenon is important to prevent a misdiagnosis of undersensing.