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De Ponti R, My I, Vilotta M, Caravati F, Marazzato J, Bagliani G, Leonelli FM. Advanced Cardiac Signal Recording. Card Electrophysiol Clin 2019; 11:203-217. [PMID: 31084847 DOI: 10.1016/j.ccep.2019.01.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Implantable loop recorders allow prolonged and continuous single-lead electrocardiogram recording, with the pivotal addition of remote monitoring. They have significantly shortened time to electrocardiographic diagnosis and appropriate therapy of many bradyarrhythmias/tachyarrhythmias and proved helpful in arrhythmia burden definition, offering invaluable information in the diagnostic workup for syncope and atrial fibrillation. Advanced cardiac signal recording is also possible by transesophageal catheters. They have been used to orient diagnosis during wide and narrow QRS complex tachycardias and also to perform minimally invasive pacing. Intracardiac electrophysiologic study remains, however, essential for diagnosis of several arrhythmias in the perspective of curative catheter ablation.
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Affiliation(s)
- Roberto De Ponti
- Department of Heart and Vessels, Ospedale di Circolo and Macchi Foundation-University of Insubria, Viale Borri, 57, 21100 Varese, Italy.
| | - Ilaria My
- Department of Heart and Vessels, Ospedale di Circolo and Macchi Foundation-University of Insubria, Viale Borri, 57, 21100 Varese, Italy
| | - Manola Vilotta
- Department of Heart and Vessels, Ospedale di Circolo and Macchi Foundation-University of Insubria, Viale Borri, 57, 21100 Varese, Italy
| | - Fabrizio Caravati
- Department of Heart and Vessels, Ospedale di Circolo and Macchi Foundation-University of Insubria, Viale Borri, 57, 21100 Varese, Italy
| | - Jacopo Marazzato
- Department of Heart and Vessels, Ospedale di Circolo and Macchi Foundation-University of Insubria, Viale Borri, 57, 21100 Varese, Italy
| | - Giuseppe Bagliani
- Arrhythmology Unit, Cardiology Department, Foligno General Hospital, Via Massimo Arcamone, Foligno, 06034 Perugia, Italy; Cardiovascular Disease Department, University of Perugia, Piazza Menghini 1, 06129 Perugia, Italy
| | - Fabio M Leonelli
- Cardiology Department, James A. Haley Veterans' Hospital, University of South Florida, 13000 Bruce B Down Boulevard, Tampa, FL 33612, USA
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Furniss G, Panagopoulos D, Newcomb D, Lines I, Dalrymple-Hay M, Haywood G. The use of an esophageal catheter to check the results of left atrial posterior wall isolation in the treatment of atrial fibrillation. PACING AND CLINICAL ELECTROPHYSIOLOGY: PACE 2018; 41:1345-1355. [PMID: 30091199 DOI: 10.1111/pace.13471] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Revised: 04/09/2018] [Accepted: 04/24/2018] [Indexed: 12/30/2022]
Affiliation(s)
- Guy Furniss
- South-West Cardiothoracic Centre, Plymouth Hospitals NHS Trust; Derriford Hospital; Plymouth PL68DH UK
| | - Dimitrios Panagopoulos
- South-West Cardiothoracic Centre, Plymouth Hospitals NHS Trust; Derriford Hospital; Plymouth PL68DH UK
| | - Dan Newcomb
- South-West Cardiothoracic Centre, Plymouth Hospitals NHS Trust; Derriford Hospital; Plymouth PL68DH UK
| | - Ian Lines
- South-West Cardiothoracic Centre, Plymouth Hospitals NHS Trust; Derriford Hospital; Plymouth PL68DH UK
| | - Malcolm Dalrymple-Hay
- South-West Cardiothoracic Centre, Plymouth Hospitals NHS Trust; Derriford Hospital; Plymouth PL68DH UK
| | - Guy Haywood
- South-West Cardiothoracic Centre, Plymouth Hospitals NHS Trust; Derriford Hospital; Plymouth PL68DH UK
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Heo T, Lee SM, Kim HS, Choi SS, Jung YH, Lee DH, Cho YS, Lee BK, Jeung KW. Verification of endotracheal tube placement using electrical stimulation through electrodes placed on the endotracheal tube cuff. Acta Anaesthesiol Scand 2016; 60:747-55. [PMID: 26846426 DOI: 10.1111/aas.12696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Revised: 11/23/2015] [Accepted: 12/21/2015] [Indexed: 11/29/2022]
Abstract
BACKGROUND Current methods for verification of endotracheal intubation can fail, particularly in emergency settings. We investigated whether a verification method using electrical stimulation through electrodes placed on the endotracheal tube cuff could distinguish endotracheal and esophageal intubations in an experimental setting. METHODS During three sequential sessions simulating emergency intubation without paralysis, rapid sequence intubation (RSI) with neuromuscular blockade, and intubation during cardiopulmonary resuscitation, eight pigs were intubated with an endotracheal tube fitted with two electrodes exposed on the cuff of the tube, first in the esophagus and next in the trachea or in reverse sequence. Cuff pressure was monitored during a 5-s electrical stimulation (20 mA, 80 Hz, 500 μs), and delta pressure was calculated as the difference between baseline cuff pressure and maximum cuff pressure during the electrical stimulation. RESULTS Delta pressure was significantly higher in esophageal than in tracheal placements in all three sequential sessions (86.0 [78.3-89.7] vs. 6.5 [2.0-7.9] mmHg, P = 0.001; 16.6 [13.2-22.8] vs. 0.8 [0.3-2.6] mmHg, P = 0.004; 66.1 [60.0-84.7] vs. 2.7 [0.7-9.7] mmHg, P = 0.001). The delta pressure did not overlap between tracheal and esophageal intubations except for the session simulating RSI with neuromuscular blockade, in which one of eight esophageal placements showed a delta pressure within the delta pressure range of tracheal placements. CONCLUSION Electrical stimulation through electrodes placed on the endotracheal tube cuff produced remarkably greater increases in cuff pressure in esophageal intubations than in tracheal intubations in an experimental setting.
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Affiliation(s)
- T. Heo
- Department of Emergency Medicine; Chonnam National University Medical School; Gwangju Korea
| | - S.-M. Lee
- Department of Emergency Medicine; Chonnam National University Medical School; Gwangju Korea
| | - H.-S. Kim
- Department of Forensic Medicine; Chonnam National University Medical School; Gwangju Korea
- Center for Creative Biomedical Scientists; Chonnam National University Medical School; Gwangju Korea
| | - S.-S. Choi
- Department of Emergency Medical Service; Howon University; Gunsan Jeollabuk-do Korea
| | - Y.-H. Jung
- Department of Emergency Medicine; Chonnam National University Medical School; Gwangju Korea
| | - D.-H. Lee
- Department of Emergency Medicine; Chonnam National University Medical School; Gwangju Korea
| | - Y.-S. Cho
- Department of Emergency Medicine; Chonnam National University Medical School; Gwangju Korea
| | - B.-K. Lee
- Department of Emergency Medicine; Chonnam National University Medical School; Gwangju Korea
| | - K.-W. Jeung
- Department of Emergency Medicine; Chonnam National University Medical School; Gwangju Korea
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Use of transesophageal atrial pacing to provide temporary chronotropic support in a dog undergoing permanent pacemaker implantation. J Vet Cardiol 2011; 13:227-30. [PMID: 21813344 DOI: 10.1016/j.jvc.2011.03.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2010] [Revised: 02/26/2011] [Accepted: 03/23/2011] [Indexed: 11/20/2022]
Abstract
A 14.5-kg, 13-year-old female spayed Cocker spaniel was evaluated because of episodic hind limb weakness. Results of examination were consistent with sick sinus syndrome with intermittent second-degree atrioventricular block. Transesophageal atrial pacing was successful in providing chronotropic support during permanent pacemaker implantation. Transesophageal atrial pacing appears to be a viable option for temporary atrial pacing in dogs with hemodynamically marked bradycardia without significant atrioventricular blockade.
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Sanders RA, Green HW, Hogan DF, Trafney D, Batra AS. Efficacy of transesophageal and transgastric cardiac pacing in the dog. J Vet Cardiol 2010; 12:49-52. [PMID: 20303843 DOI: 10.1016/j.jvc.2009.12.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2009] [Revised: 11/09/2009] [Accepted: 12/15/2009] [Indexed: 10/19/2022]
Abstract
OBJECTIVES Determine if temporary artificial cardiac pacing can be accomplished from transesophageal or transgastric pacing sites. ANIMALS, MATERIALS AND METHODS Nine purpose bred Beagle dogs had a multipolar electrophysiology pacing catheter inserted transnasally and advanced into the distal esophagus or stomach under general anesthesia. Artificial atrial pacing was attempted using a bipolar configuration from the distal esophagus with the dogs in left lateral recumbency. Artificial ventricular pacing was attempted from the distal esophagus and stomach using unipolar and bipolar configurations with the dogs in multiple positions. RESULTS Transesophageal atrial pacing was accomplished in all dogs with a mean threshold of 10.5 mA (+ or - 3.9) and a 15 mm polar separation with no skeletal muscle stimulation. All attempts at transgastric and transesophageal ventricular pacing were unsuccessful. CONCLUSIONS Transesophageal atrial pacing using standard cardiac pacing equipment is simple to perform and is a viable alternative to temporary transvenous or transthoracic pacing for supraventricular bradyarrhythmias without atrioventricular conduction disturbances. Transesophageal and transgastric ventricular pacing does not appear possible using the pacing configurations in this study.
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Affiliation(s)
- Robert A Sanders
- Michigan State University College of Veterinary Medicine, East Lansing, MI 48823, USA.
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Modi SA, Siegel RJ, Birnbaum Y, Atar S. Systematic overview and clinical applications of pacing atrial stress echocardiography. Am J Cardiol 2006; 98:549-56. [PMID: 16893716 DOI: 10.1016/j.amjcard.2006.02.067] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2005] [Revised: 02/27/2006] [Accepted: 02/27/2006] [Indexed: 11/23/2022]
Abstract
Pacing atrial stress echocardiography (PASE) has been studied over the past 3 decades for the evaluation of myocardial ischemia. Published studies suggest that PASE may be used as an alternative to exercise or pharmacologic stress imaging. The recent introduction of improved pacing electrodes, together with use of accelerated and shortened pacing protocols and improvements in transthoracic echocardiographic imaging techniques, makes PASE an appealing stress imaging method. A critical analysis of the diagnostic accuracy of PASE shows equivalence with other imaging stress modalities. PASE has been found to be highly feasible and accurate technique that may expedite the diagnosis and risk stratification of patients with coronary artery disease. This review addresses the history, hemodynamics, protocols, accuracy, clinical utility, and cost-effectiveness of PASE as well as elucidating its place among other stress modalities.
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Affiliation(s)
- Shreyas A Modi
- Department of Internal Medicine, Division of Cardiology, University of Texas Medical Branch, Galveston, Texas, USA
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Pehrson S, Wedekind T, Madsen B, Holm M, Res JC, Olsson SB. The optimal oesophageal pacing technique--the importance of body position, interelectrode spacing, electrode surface area, pacing waveform and intra-oesophageal local anaesthesia. Scand Cardiovasc J Suppl 1999; 33:103-9. [PMID: 10225312 DOI: 10.1080/14017439950141911] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
In order to improve the technique of transoesophageal atrial stimulation (TAS), the effects of body position, interelectrode spacing and electrode surface area on pacing threshold were assessed in two substudies. The effects of intra-oesophageal local anaesthesia and of two different pacing wave configurations on pacing threshold and discomfort were also assessed. Substudy I comprised 16 subjects (3 patients with a history of paroxysmal supraventricular tachycardia and 13 healthy volunteers) and substudy II comprised 16 healthy volunteers. TAS was performed using a hexapolar luminal prototype oesophageal electrode catheter. In substudy I bipolar pacing was performed in the semi-supine and left decubitus body positions for different pulse durations (20, 10, 6 and 2 ms), interelectrode pole distances (10 to 24 mm) and electrode pole surface areas (0.22 to 0.66 cm2). In substudy II TAS was performed with square wave and triangular waveform pulses after intra-oesophageal saline and lidocaine 20 mg/ml. These solutions were given in random order. Neither the interelectrode distance nor electrode surface areas had any significant influence on pacing thresholds. Stimulation thresholds were not affected by body position. Intraoesophageal lidocaine did not affect the discomfort experienced. Peak pacing thresholds using a triangular waveform were significantly higher than thresholds using a square waveformn (p < 0.001). The optimal pacing technique for TAS remains to be defined. The TAS-induced pain is probably not generated from the oesophageal mucous membrane. There is a significant difference in pacing thresholds between triangular and square waveforms.
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Affiliation(s)
- S Pehrson
- Department of Cardiology, University Hospital, Lund, Sweeden
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McEneaney DJ, Cochrane DJ, Anderson JA, Adgey AA. A gastroesophageal electrode for atrial and ventricular pacing. Pacing Clin Electrophysiol 1997; 20:1815-25. [PMID: 9249837 DOI: 10.1111/j.1540-8159.1997.tb03572.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Temporary transvenous cardiac pacing requires technical expertise and access to fluoroscopy. We have developed a gastroesophageal electrode capable of atrial and ventricular pacing. The flexible polythene gastroesophageal electrode is passed into the stomach under light sedation. Five ring electrodes, now positioned in the lower esophagus, are used for atrial pacing. A point source (cathode) on the distal tip of the electrode, now positioned in the gastric fundus, is used for ventricular pacing. Two configurations of atrial and ventricular pacing were compared: unipolar and bipolar. During unipolar ventricular pacing the indifferent electrode (anode) was a high impedance chest pad. For bipolar ventricular pacing the indifferent electrode was a ring electrodes placed 2 cm proximal to the tip. Unipolar atrial pacing was performed with 1 of 5 proximal ring electrodes acting as cathode ("cathodic") or as anode ("anodic") in conjunction with a chest pad. Bipolar atrial pacing was performed using combinations of 2 of 5 ring electrodes. Atrial capture was obtained in all 55 subjects attempted. When all electrode combinations were compared, atrial capture was significantly more frequent using the bipolar approach (153/210 bipolar, 65/210 unipolar; t = 7.37, P < 0.001). For unipolar atrial pacing, cathodic stimulation (from esophagus) was more successful than anodic stimulation (cathodic 62/105, anodic 20/105; t = 5.81, P < 0.001). In 43 subjects attempted unipolar ventricular pacing resulted in a higher frequency of capture than the bipolar approach (unipolar 41/43 (95.3%), bipolar 19/43 (44.2%); P < 0.001). In conclusion, atrial pacing was optimal using pairs of ring electrodes ("bipolar") while ventricular pacing was optimal using the distal electrode tip (cathode) in conjunction with a chest pad electrode ("unipolar"). This gastroesophageal electrode may be useful in the emergency management of acute bradyarrhythmias and for elective electrophysiological studies.
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Affiliation(s)
- D J McEneaney
- Cardiac Unit at the Royal Victoria Hospital, Belfast, Northern Ireland
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Roth JV, Brody JD, Denham EJ. Positioning the Pacing Esophageal Stethoscope for Transesophageal Atrial Pacing Without P-Wave Recording. Anesth Analg 1996. [DOI: 10.1213/00000539-199607000-00009] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Roth JV, Brody JD, Denham EJ. Positioning the pacing esophageal stethoscope for transesophageal atrial pacing without P-wave recording: implications for transesophageal ventricular pacing. Anesth Analg 1996; 83:48-54. [PMID: 8659764 DOI: 10.1097/00000539-199607000-00009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
This study determined guidelines for positioning a new pacing esophageal stethoscope (PES) used for transesophageal atrial pacing (TEAP) without having to record esophageal P waves. In 44 patients with heights ranging from 142 cm (4'8") to 193 cm (6'4"), the PES was inserted to a depth of insertion (DOI) of 43 cm. As the PES was withdrawn, TEAP thresholds were determined at every DOI in 1-cm intervals between 43 and 25 cm DOI inclusive. TEAP was accomplished in all 44 patients. The minimum TEAP threshold (mean +/- SD 10.8 +/- 4.0 mA) was < or = 17 mA in 43 of 44 patients (98%). Except for one patient, TEAP could be accomplished over a 9- to 19-cm (mean +/- SD, 13.7 +/- 2.8 cm) wide range of DOI. Unintentional transesophageal ventricular pacing (TEVP) occurred in 15 of 44 (34%) of patients. TEVP occurred over a 1- to 7-cm (mean +/- SD, 3.7 +/- 1.7 cm) wide range of DOI; the minimum TEVP threshold averaged 30.4 +/- 6.4 mA. TEAP was consistently accomplished at DOIs more proximal than where TEVP could occur and with lower currents than that required for TEVP. An insertion depth, in centimeters, equal to half of the patient's height, in inches, produced successful TEAP in all 44 patients; the minimum TEAP threshold occurred on average at a DOI 2.6 cm more proximal. Asynchronous TEVP can be avoided by using lower currents at shallow DOIs.
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Affiliation(s)
- J V Roth
- Department of Anesthesiology, Albert Einstein Medical Center, Philadelphia, Pennsylvania 19141, USA
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11
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Hofman MB, de Cock CC, van der Linden JC, van Rossum AC, Visser FC, Sprenger M, Westerhof N. Transesophageal cardiac pacing during magnetic resonance imaging: feasibility and safety considerations. Magn Reson Med 1996; 35:413-22. [PMID: 8699954 DOI: 10.1002/mrm.1910350320] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The feasibility and safety of transesophageal cardiac pacing during clinical MRI at 1.5 Tesla is considered. An MRI compatible pace catheter was developed. In vitro testing showed a normal performance of the pulse generator, image artifacts that extended less than 11 mm from the catheter, and a less than 5% increase in noise. Cardiac stimulation induced by MRI was not observed and, theoretically, is not expected. Potentially, tissue around the catheter tip may become heated. This heating (delta tau) was monitored. Eight dogs were exposed to MRI during pacing. For low RF radiation exposure, a time-averaged squared B1 field below 0.08 p tau 2 (SAR < 0.03 W/kg), delta tau was below 1 degree C. For high RF radiation exposure, but at normal RF radiation specific absorption rate (0.4 W/kg) delta tau was 5 degrees C. Thus, transesophageal atrial pacing during MRI at low RF exposure seems to be possible to perform cardiac stress studies or to correct unstable heart rates.
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Affiliation(s)
- M B Hofman
- Department of Clinical Physics and Engineering, ICaR-VU, Free University, Amsterdam, The Netherlands
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Roth JV, Huertas R, Sagel JS. The Effect of Nasal or Oral Gastric Tubes on Transesophageal Atrial Pacing Thresholds. Anesth Analg 1995. [DOI: 10.1213/00000539-199507000-00010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Roth JV, Huertas R, Sagel JS. The effect of nasal or oral gastric tubes on transesophageal atrial pacing thresholds. Anesth Analg 1995; 81:49-51. [PMID: 7598281 DOI: 10.1097/00000539-199507000-00010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
This study was performed to evaluate whether the presence of either nasal or oral gastric tubes (GTs) would affect the ability to accomplish transesophageal atrial pacing (TAP). After endotracheal intubation, pacing esophageal stethoscopes were placed and the TAP thresholds were measured in 20 patients. With the PES fixed in position, GTs were inserted and pacing thresholds were remeasured. TAP was accomplished in all patients pre- and postinsertion. The mean +/- SD, range, and median TAP thresholds (mA) were 13.7 +/- 5.8, 7-25, and 12 preinsertion and 13.9 +/- 5.2, 5.5-25, and 13 postinsertion. The preinsertion-postinsertion differences ranged from -6 to 5 mA with a mean of the difference of -0.2 mA (95% confidence interval, -1.61-1.21 mA). No significant difference between the pre- and postinsertion groups was detected by the paired t-test, P = 0.77. In summary, the presence of GTs does not significantly affect TAP thresholds. Attempts to achieve TAP are expected to be successful in patients with either a nasal or oral GT in place.
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Affiliation(s)
- J V Roth
- Department of Anesthesiology, Albert Einstein Medical Center, Philadelphia, Pennsylvania 19141, USA
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Cochrane DJ, McEneaney DJ, Dempsey GJ, Anderson JM, Adgey AA. An esophageal and gastric approach to ventricular pacing. Pacing Clin Electrophysiol 1995; 18:28-33. [PMID: 7700827 DOI: 10.1111/j.1540-8159.1995.tb02472.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Using a unipolar esothoracic pacing system (where current passes from a point source positioned in the distal esophagus to a chest wall pad) and pulse duration of 50 msec, satisfactory 1:1 ventricular capture was obtained in 57 (86%) of 66 patients, with a mean threshold current of 27.7 mA at an optimal depth of 40.3 cm from the lower lip. When the unipolar esothoracic and bipolar transesophageal ventricular pacing systems were compared, the bipolar system was associated with a lower success rate and higher threshold current. When unipolar esothoracic pacing and gastrothoracic pacing (where current passes from a point source positioned in the stomach to a chest wall pad) were compared in 23 patients with bradyarrhythmia, ventricular capture was achieved using gastrothoracic pacing in 22 patients (96%) and esothoracic pacing in 21 (91%): gastrothoracic pacing required less current (16.0 mA +/- SD 7.2 vs 25.8 mA +/- SD 8.6). Optimal ventricular capture occurred using a unipolar gastrothoracic pacing electrode inserted to an average depth of 44.3 cm together with a high impedance chest pad (250 omega) placed in the fourth interspace at the left sternal edge, with 50-msec current pulses and a mean threshold of 16.0 mA. Thus, using a gastroesophageal electrode system, ventricular pacing can be achieved successfully, and the availability of such a system could play a major role in resuscitation of patients from severe bradyarrhythmias.
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Affiliation(s)
- D J Cochrane
- Regional Medical Cardiology Centre, Royal Victoria Hospital, Belfast, Northern Ireland
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Pehrson SM, Blomström-Lundqvist C, Ljungström E, Blomström P. Clinical value of transesophageal atrial stimulation and recording in patients with arrhythmia-related symptoms or documented supraventricular tachycardia--correlation to clinical history and invasive studies. Clin Cardiol 1994; 17:528-34. [PMID: 8001299 DOI: 10.1002/clc.4960171004] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
The main objective of the present study was to evaluate the clinical applicability of transesophageal atrial stimulation (TAS) and recording with regard to inducibility of supraventricular tachycardia (SVT) in patients with either an ECG-documented paroxysmal SVT or a clinical history of palpitations suggesting this disease. A further objective was to assess the inducibility of SVT and to compare the inducibility by TAS with that obtained by an invasive electrophysiologic study (EPS). A total of 64 patients (aged 13-74 years) with ECG-documented paroxysmal SVT (n = 50) or only a history of palpitations (n = 14) was referred for TAS. Preexcitation was present in 35 patients. The study protocol included single and double extrastimuli delivered at a basic paced interval of 500 ms, and incremental atrial stimulation until a cycle length of 275 ms or a second-degree AV block appeared. In 10 patients atropine intravenously was required for induction. The same protocol was used in 34 of the patients who also underwent invasive EPS. TAS was completed in 56 of 64 patients (88%). In this group SVT was induced during TAS in 84% (47/56). Of patients with ECG-documented tachycardia, clinical tachycardia was induced in 90% (35/39) with ECG-documented regular paroxysmal SVT and in 67% of patients (4/6) with ECG-documented atrial fibrillation. In patients without ECG-documented atrial fibrillation. In patients without ECG-documented tachycardia, clinically relevant arrhythmia was induced in 73% (8/11). In 30 of 32 patients (94%) with an inducible tachycardia during invasive EPS, it was also possible to induce the tachycardia by TAS.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- S M Pehrson
- Division of Cardiology, University Hospital, Lund, Sweden
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16
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Cox JN. Pathology of cardiac pacemakers and central catheters. CURRENT TOPICS IN PATHOLOGY. ERGEBNISSE DER PATHOLOGIE 1994; 86:199-271. [PMID: 8162711 DOI: 10.1007/978-3-642-76846-0_6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- J N Cox
- Department of Pathology, CMU, Geneva, Switzerland
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Tucker KJ, Wilson C. A comparison of transoesophageal atrial pacing and direct current cardioversion for the termination of atrial flutter: a prospective, randomised clinical trial. BRITISH HEART JOURNAL 1993; 69:530-5. [PMID: 8343321 PMCID: PMC1025166 DOI: 10.1136/hrt.69.6.530] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
OBJECTIVE To compare the safety and efficacy of transoesophageal atrial pacing (TAP) with an easily swallowed pill electrode and direct current cardioversion (DCC) in patients with atrial flutter that was refractory to appropriate medical treatment. DESIGN Prospective, randomised clinical trial. SETTING Community based United States naval hospital. SUBJECTS Twenty one consecutive patients with refractory atrial flutter selected consecutively from the inpatient cardiology consultation service. All patients were haemodynamically stable and medical treatment with a class IA or IC antiarrhythmic agent had failed. Eleven patients were treated with TAP and 10 patients were treated with DCC. INTERVENTIONS Digoxin was given to all patients to control the ventricular rate to < 100/minute. MAIN OUTCOME MEASURE Conversion to normal sinus rhythm and arrhythmias after cardioversion. RESULTS Conversion to normal sinus rhythm was similar in both groups (TAP 8/11, DCC 9/10, p = 0.31). Arrhythmias after cardioversion including third degree heart block and non-sustained ventricular tachycardia were more frequent in the DCC group (TAP 0/11, DCC 6/10, p = 0.02). CONCLUSION Transoesophageal atrial pacing with an easily swallowed pill electrode is safe, well tolerated, and is as efficacious as DCC for refractory atrial flutter.
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Affiliation(s)
- K J Tucker
- Department of Medicine, Naval Hospital, Oakland, California
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Heinke M, Volkmann H. Balloon electrode catheter for transesophageal atrial pacing and transesophageal ECG recording. Pacing Clin Electrophysiol 1992; 15:1953-6. [PMID: 1279578 DOI: 10.1111/j.1540-8159.1992.tb03000.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A new balloon electrode catheter (10 French) with five or six balloon electrodes placed on the cardiac side was developed for transesophageal atrial pacing and bipolar ECG recording. The diameter of the hemispheric electrodes is 6 mm and the length of the esophageal balloon is 10 cm. The transesophageal atrial pacing threshold was measured with the balloon electrode catheter by transesophageal programmed atrial stimulation (TPS) (n = 54). At the onset of TPS, the feeling, capture (n = 54), and pain voltage threshold (n = 6) were measured by increasing the amplitude of the pacing voltage during high rate bipolar atrial pacing and bipolar atrial ECG recording. In 38 TPS, the capture threshold was lower than the feeling threshold (n = 28). In 16 TPS, the capture threshold was higher than the feeling threshold. In conclusion, painless atrial pacing and excellent ECG recording can be achieved with a multipolar esophageal balloon electrode catheter with a low pacing voltage amplitude and a high P wave amplitude.
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Affiliation(s)
- M Heinke
- Department of Internal Medicine, Jena-Lobeda, Germany
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19
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Jadvar H, Jenkins JM, Stewart RE, Schwaiger M, Arzbaecher RC. Computer analysis of the electrocardiogram during esophageal pacing cardiac stress. IEEE Trans Biomed Eng 1991; 38:1089-99. [PMID: 1748443 DOI: 10.1109/10.99072] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
It has been estimated that 15 to 30% of patients with suspected or known coronary artery disease are unable to perform an adequate exercise stress test due to a variety of reasons such as obesity, poor physical condition, claudication, etc. Transesophageal atrial pacing has been proposed as a noninvasive alternative for inducing cardiac stress in patients who cannot exercise. Although computer analysis is commonly employed to analyze the electrocardiogram (ECG) during the conventional exercise stress test, the surface ECG recorded during transesophageal atrial pacing is contaminated with large pacing artifacts which confound beat identification by standard computer software. We report the development of a robust signal processing algorithm for interpretation of the surface ECG during transesophageal atrial pacing stress. The algorithm employs novel schemes using both linear and nonlinear transformations to detect and differentiate between the pacing artifact and QRS complex even in difficult situations where the pacing artifact is in proximity to or superimposed on the QRS complex. The algorithm uses sophisticated logic for automatic recognition of sustained capture. It subsequently calculates beat-by-beat and average (over five beats) ST segment amplitude and slope. The algorithm also reports the instantaneous heart rate, RR interval, pace-to-R interval, R-wave amplitude, and estimated sinus node recovery time upon loss of sustained capture. The limitations of present exercise ECG computer methods in processing the ECG during transesophageal atrial pacing stress are evaluated and significantly improved performance by our algorithm is demonstrated.
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Affiliation(s)
- H Jadvar
- Pritzker Institute of Medical Engineering, Illinois Institute of Technology, Chicago 60616
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20
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Res JC, Van Woersem RJ, Dekker E, Dunning AJ. Transesophageal atrial pacing--stimulation and discomfort thresholds: the role of electrode configuration and pulse width. Pacing Clin Electrophysiol 1991; 14:1359-66. [PMID: 1720529 DOI: 10.1111/j.1540-8159.1991.tb02881.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A balloon catheter with six electrodes has been developed for transesophageal atrial stimulation of the human heart. Introduction is easy and its positioning is simple with the help of six unipolar atrial electrograms. In a group of 20 healthy volunteers, stimulation and discomfort thresholds (intolerable discomfort) were measured for three levels of pulse widths (12, 16, and 20 msec) and for five electrode configurations. Stimulation thresholds were below discomfort thresholds in each case. The stimulation threshold depended on pulse width and not on electrode configuration. The discomfort threshold, however, depended on the electrode configuration and not on the pulse width. A moderate but potentially important increase of the ratio between stimulation threshold and discomfort threshold could be achieved by combining a long pulse width (20 msec) and avoiding the largest distance between the active (cathode) and the passive (anode) electrode. Transesophageal atrial stimulation promises to be a practical noninvasive tool for the termination of regular supraventricular tachycardias, basal electrophysiological studies, and controlled acceleration of the heart rate in the study of myocardial ischemia.
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Affiliation(s)
- J C Res
- Department of Cardiology, University of Amsterdam, The Netherlands
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21
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Barold SS. Transesophageal pacing. Pacing Clin Electrophysiol 1990; 13:1324-5. [PMID: 1701546 DOI: 10.1111/j.1540-8159.1990.tb02030.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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22
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Affiliation(s)
- M Santini
- Cardiac Electrophysiology Laboratory, San Camillo Hospital, Rome, Italy
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23
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Matthews RV, Haskell RJ, Ginzton LE, Laks MM. Usefulness of esophageal pill electrode atrial pacing with quantitative two-dimensional echocardiography for diagnosing coronary artery disease. Am J Cardiol 1989; 64:730-5. [PMID: 2801523 DOI: 10.1016/0002-9149(89)90755-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Noninvasive diagnosis of coronary artery disease (CAD) is difficult in patients who are unable to exercise. In this study esophageal pill electrode atrial pacing was used as a myocardial stress not requiring exercise, and changes in ejection fraction and pressure volume ratio during pacing with 2-dimensional echocardiography were quantitatively analyzed. All patients had completed a Bruce protocol treadmill exercise test and had undergone coronary arteriography. Of 26 patients, 22 were successfully paced (85%). Comparable rate-pressure products were obtained for treadmill exercise (23,500 +/- 5,900 mm Hg/min) and pacing (24,100 +/- 4,400 mm Hg/min; difference not significant). Of the 22 patients completing the study 8 had normal coronary arteries (group I) and 14 had CAD (group II). The change in ejection fraction with pacing in group I patients was not significant (3 +/- 8%). In group II ejection fraction decreased with pacing (-8 +/- 13%; p = 0.025). The pressure/volume ratio increased in group I with pacing (3.8 +/- 1.8 mm Hg/min/m2; p = 0.05) and was unchanged in group II (0.3 +/- 1.8 mm Hg/min/m2; difference not significant). Using an ejection fraction decrease with pacing or a failure to increase pressure/volume ratio with pacing as criterion for the presence of CAD, similar predictive accuracies were obtained when compared to treadmill exercise testing. Esophageal pill electrode atrial pacing with quantitative 2-dimensional echocardiography may be a useful noninvasive, nonexercise method to detect CAD.
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Affiliation(s)
- R V Matthews
- Heart Institute, Hospital of the Good Samaritan, Los Angeles, California 90017
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24
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Kerr CR, Chung DC, Wickham G, Jameson M, Vorderbrugge S. Impedance to transesophageal atrial pacing: significance regarding power sources. Pacing Clin Electrophysiol 1989; 12:930-5. [PMID: 2472620 DOI: 10.1111/j.1540-8159.1989.tb05030.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Transesophageal stimulation is an expeditious method of atrial pacing. Using pulse widths of 10 msec results in reduction of current requirement to values that are usually less than 15 mA. An unknown variable in transesophageal atrial pacing has been impedance. In this study, we investigated the impedance to transesophageal atrial pacing in ten patients using a stimulator with a 63 V power source capable of delivering constant current to 20 mA against an impedance of 2,000 ohms. A bipolar electrode was used to deliver stimuli with a current of 15 mA. Voltage across a known resistance and current were measured on an oscilloscope and the impedance was calculated. Pacing thresholds were also performed and ranged from 6.2 to 16.5 mA (mean 9.4 +/- 2.9 mA, SD). Impedance varied between 720 and 2,670 ohms (mean 1,750 +/- 540 ohms). The stimulator used to measure impedance in man and two other commercially available stimulators were bench tested against known resistances of 500 to 2,000 ohms. The other stimulators with power sources of 12.5 and 15 V had attenuation of the delivered current at resistances of between 1,000 and 2,000 ohms. Thus, this study has demonstrated that transesophageal atrial pacing incurs impedances two to five times greater than incurred with intracardiac pacing leads. Therefore stimulators with high power sources are required to deliver the programmed current against these impedances.
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Affiliation(s)
- C R Kerr
- Department of Medicine, University of British Columbia, Vancouver
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25
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Twidale N, Roberts-Thomson P, Tonkin AM. Transesophageal electrocardiography and atrial pacing in acute cardiac care: diagnostic and therapeutic value. AUSTRALIAN AND NEW ZEALAND JOURNAL OF MEDICINE 1989; 19:11-5. [PMID: 2764801 DOI: 10.1111/j.1445-5994.1989.tb01665.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The utility of transesophageal electrocardiography using a bipolar 'pill electrode' was assessed in 17 consecutive patients with tachycardia presenting to our casualty department. Standard 12-lead electrocardiography showed regular narrow QRS tachycardia in 12 patients, and five patients had wide QRS tachycardia. Esophageal atrial electrogram recordings were obtained in 14 patients (82%), and these were helpful in determining the mechanism of tachycardia in 11 patients (78%). Of these 11, seven patients fulfilled criteria for atrioventricular junctional (AVJ) tachycardia based on measurement of the minimum interval between the onset of ventricular depolarisation and earliest atrial (esophageal) activity. One of these patients had presented with a wide QRS tachycardia. The other four patients were diagnosed as having ventricular tachycardia (VT) following diagnosis of AV dissociation. Atrial overdrive pacing, via the pill electrode, successfully reverted four of the nine patients (44%) with narrow QRS tachycardia but no patient with VT. Esophageal recording during tachycardia is a simple, relatively non-invasive technique which is helpful in suggesting the mechanism of tachycardia both in patients with narrow and wide QRS tachycardia, and may have a therapeutic role in patients with AVJ tachycardia.
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Affiliation(s)
- N Twidale
- Department of Medicine, Flinders Medical Centre, Bedford Park, SA
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Fontaine JM, Alma-Perri C, el-Sherif N. DDD-pacemaker pseudomalfunction during supraventricular tachycardia. Pacing Clin Electrophysiol 1988; 11:1380-5. [PMID: 2462211 DOI: 10.1111/j.1540-8159.1988.tb04984.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Asynchronous pacing during the presence of electromagnetic interference or other sources of "noise" is a protective mechanism available to prevent pacemaker output inhibition. We describe a patient with a DDD pacemaker who had asynchronous dual chamber or noise reversion pacing as a consequence of repetitive signals (QRS complexes) falling into the noise sampling period (NSP) of the pacemaker ventricular refractory period. During supraventricular tachycardia at a rate of 215 bpm, noise reversion mode pacing occurred when QRS complexes were well detected immediately after the termination of a normal pacemaker ventricular refractory period and treated as a premature ventricular depolarization, resulting in automatic refractory period extension. Recycling of this extended refractory period occurred when consecutive QRS complexes were detected during the NSP and forced asynchronous dual chamber pacing at the programmed lower rate. The mechanism is presented and was supported by subthreshold esophageal pacing simulating the tachycadia and initiating the noise reversion response.
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Affiliation(s)
- J M Fontaine
- State University of New York Health Science Center, New York
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27
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Huang SK, Bazgan ID. Use of the esophageal pill electrode for pacing inhibition of bipolar VVI pacemakers. Am J Cardiol 1988; 61:1124-7. [PMID: 3364370 DOI: 10.1016/0002-9149(88)90143-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- S K Huang
- Department of Internal Medicine, Tucson Veterans Administration Medical Center, Arizona
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28
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Blomström-Lundqvist C, Edvardsson N. Transesophageal versus intracardiac atrial stimulation in assessing electrophysiologic parameters of the sinus and AV nodes and of the atrial myocardium. Pacing Clin Electrophysiol 1987; 10:1081-95. [PMID: 2444932 DOI: 10.1111/j.1540-8159.1987.tb06127.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Electrophysiological parameters of the sinus and AV nodes and of the atrial myocardium were assessed with both transesophageal atrial stimulation (TAS) and intracardiac atrial stimulation (ICS) in the same patient during the same study. The study group was comprised of nine men and seven women, aged 45 to 79 years, referred for the evaluation of syncope of possible arrhythmogenic origin. Twelve patients were included for analysis. Autonomic inhibition (AI) was obtained in five patients. The most striking result was the significantly longer AERP with TAS (mean 286 +/- 9 ms) than with ICS (mean 244 +/- 12 ms; p than 0.02). After AI, the AERP was even more prolonged with TAS (mean 332 +/- 20 ms) than with ICS (mean 237 +/- 8 ms; p less than 0.01). Intraatrial and AV nodal conduction times assessed at multiple paced cycle lengths were significantly shorter with TAS than with ICS. There was no difference between TAS and ICS with regard to AVERP, Wenckebach periodicity and H-V intervals. Although a tendency towards shorter sinus node recovery time (SNRT) and sinoatrial conduction time (SACT) was observed with TAS, the difference was not statistically significant. Possible mechanisms of the differences are discussed. It seemed clear that the site of origin of an atrial impulse can have definite effects upon excitability and conduction properties of atrial and AV nodal fibers. Enhanced sympathetic activity during TAS was also suggested. The electrophysiological properties inherent in the TAS technique warrant further elucidation.
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Falk RH, Werner M. Transesophageal atrial pacing using a pill electrode for the termination of atrial flutter. Chest 1987; 92:110-4. [PMID: 3595221 DOI: 10.1378/chest.92.1.110] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
To determine the efficacy of transesophageal rapid atrial pacing with a "pill-electrode" for the termination of atrial flutter, we studied 14 consecutive unselected patients presenting with atrial flutter of various etiologies. The bipolar pill-electrode (interelectrode distance 13 mm) was introduced orally without sedation. Of 14 pacing attempts, atrial capture was obtained in 13 (93 percent), and sustained alteration in rhythm (atrial fibrillation, sinus rhythm or type 2 flutter) in 12 (86 percent). Normal sinus rhythm occurred in six (43 percent), in all of whom it was preceded by transient atrial fibrillation. There was no difference in baseline flutter rates, pacing rates for atrial capture, or duration of flutter between patients reverting to sinus rhythm and those remaining in flutter or converting to atrial fibrillation. Pacing was well tolerated in all but one subject. Thus, esophageal pacing with the pill-electrode was simple to perform, well-tolerated and highly successful for atrial capture in patients with atrial flutter. Although it had a lower success rate than DC cardioversion in producing sinus rhythm, the simplicity of application makes it a useful initial alternative, particularly in patients in whom cardioversion may be hazardous.
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Kerr CR, Chung DC, Cooper J. Improved transesophageal recording and stimulation utilizing a new quadripolar lead configuration. Pacing Clin Electrophysiol 1986; 9:644-51. [PMID: 2429269 DOI: 10.1111/j.1540-8159.1986.tb05411.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Transesophageal pacing and recording are valuable techniques in the diagnosis and treatment of patients with arrhythmias. Bipolar pacing with bipolar catheters has been effective, but recording from the same electrodes is not possible during and immediately following pacing. We utilized a fine no. 4 French quadripolar catheter in 21 subjects to stimulate the atrium and record atrial electrical activity simultaneously. Pacing characteristics were equivalent to previously used bipolar catheters and recording was markedly enhanced. Bipolar atrial electrograms could be recorded either during pacing or at the first atrial depolarization following pacing in all patients. Thus, this quadripolar pacing lead improves the diagnostic value of studies involving transesophageal atrial pacing and recording.
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31
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Kerr CR. Use of the pill electrode for transesophageal atrial pacing. Pacing Clin Electrophysiol 1986; 9:606-7. [PMID: 2426682 DOI: 10.1111/j.1540-8159.1986.tb06620.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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32
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Blomström-Lundqvist C, Dohnal M, Hirsch I, Lindblad A, Hjalmarson A, Olsson SB, Edvardsson N. Effect of long term treatment with metoprolol and sotalol on ventricular repolarisation measured by use of transoesophageal atrial pacing. BRITISH HEART JOURNAL 1986; 55:181-6. [PMID: 3080012 PMCID: PMC1232115 DOI: 10.1136/hrt.55.2.181] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The effects of long term (4 weeks) treatment with oral metoprolol (100 mg twice daily) and sotalol (160 mg twice daily) on ventricular repolarisation time were compared in a double blind crossover study in 20 patients post-infarction. For QT interval studies transoesophageal atrial pacing was performed at a cycle length of 800 ms. Sotalol prolonged the QT interval by 5-7% compared with metoprolol. The prolongation reflects a change in the repolarisation time because there was no change in the QS interval. Measurements of heart rate at rest and during bicycle exercise indicated that metoprolol and sotalol in the doses selected were equipotent as beta blockers. Transoesophageal atrial pacing is a simple non-invasive method with few and mild side effects that is well suited to drug studies.
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