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Ablation of Inappropriate Sinus Tachycardia (IST)

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ClinicalTrials.gov Identifier: NCT00584649
Recruitment Status : Recruiting
First Posted : January 2, 2008
Last Update Posted : April 11, 2018
Sponsor:
Information provided by (Responsible Party):
University of Oklahoma

Study Description
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Brief Summary:
Hypothesis- Radiofrequency ablation, targeting the sympathetic input of the sinus node identified by 20Hz stimulation at the junction of the superior vena cava and the right atrium, will effectively reduce sinus rate acutely and will reduce palpitations due to inappropriate sinus tachycardia without the need for pacemaker implantation due to sinus node dysfunction post ablation.

Condition or disease Intervention/treatment Phase
Inappropriate Sinus Tachycardia Procedure: electrophysiology study and radiofrequency ablation Not Applicable

Detailed Description:

Inappropriate sinus tachycardia syndrome describes a condition in which a patient's heart rate is intermittently (or persistently) higher than expected for the physiological circumstances, with ECG appearance indistinguishable from normal sinus rhythm, after the exclusion of medical conditions causing sinus tachycarida.

Hypothesis- Radiofrequency ablation, targeting the sympathetic input of the sinus node identified by 20Hz stimulation at the junction of the superior vena cava and the right atrium, will effectively reduce sinus rate acutely and will reduce palpitations due to inappropriate sinus tachycardia without the need for pacemaker implantation due to sinus node dysfunction post ablation.


Study Design
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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 25 participants
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Ablation of Inappropriate Sinus Tachycardia Syndrome by Targeting Cardiac Neural Input
Study Start Date : April 2004
Estimated Primary Completion Date : January 2020
Estimated Study Completion Date : January 2020
Arms and Interventions
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Arm Intervention/treatment
Single Group Assignment
electrophysiology study and radiofrequency ablation
 Procedure: electrophysiology study and radiofrequency ablation
stimulation protocol searching for the neural inputs to the sinus node region and radiofrequency ablation of neural input to the heart


Outcome Measures
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Primary Outcome Measures :
  1. Improvement in:symptoms(palpitations);quality of life;resting heart rate;mean 24 hour heart rate;heart rate variability; [ Time Frame: Clinical efficacy is established if the improvement is maintained after 6months to a year. ]

Secondary Outcome Measures :
  1. duration of symptom limited Bruce protocol exercise treadmill test;duration of exercise test required to increase rate by 20%. [ Time Frame: 6 months to 1 year ]

Eligibility Criteria
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Ages Eligible for Study:   18 Years to 80 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Criteria

Inclusion Criteria:

  1. Patients between the ages of 18 and 80 years old, who are scheduled for an ablation procedure for suspected inappropriate sinus tachycardia, with symptomatic palpitations during periods where documented electrogram recordings suggest sinus tachycardia (holter, event recorder, or 12 lead ECG).
  2. Sinus rate greater than 100 bpm with minimal physiologic challenge, or mean sinus rate during 24 hour holter more than 95bpm, or daytime resting heart rate more than 95bpm.
  3. Symptoms (or sinus rate) not explained by an alternative medical or electrophysiological diagnosis.
  4. Symptoms refractory to treatment with beta-blocker medication, or beta-blockers contra-indicated or not tolerated

Exclusion Criteria:

  1. Children under 18 years of age (due to greater risk from exposure to X rays).
  2. Any medical condition significantly increasing the risk of extending the ablation procedure or of X ray exposure, including pregnancy.
  3. Significant orthostatic hypotension (due to need for rapid chronotropic response to fall in blood pressure)
  4. An alternative cause for sinus tachycardia identified (e.g. hyperthyroidism or pheochromocytoma).
  5. Inability or unwillingness to provide informed consent.
Contacts and Locations
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Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00584649


Contacts
Contact: Deborah J Lockwood, MD 405-271 9696 deborah-lockwood@ouhsc.edu
Contact: Kathy Drennan, RN, CCRP 405-271 2299 kathy-drennan@ouhsc.edu

Locations
United States, Oklahoma
University of Oklahoma Health Sciences Center Recruiting
Oklahoma City, Oklahoma, United States, 73104
Sub-Investigator: Karen Beckman, MD         
Sub-Investigator: Sunny Po, MD         
Sponsors and Collaborators
University of Oklahoma
Investigators
Principal Investigator: Deborah J Lockwood, MD University of Oklahoma HSC Assistant Professor Medicine/Cardiology
More Information
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Responsible Party: University of Oklahoma
ClinicalTrials.gov Identifier: NCT00584649     History of Changes
Other Study ID Numbers: 1364
First Posted: January 2, 2008    Key Record Dates
Last Update Posted: April 11, 2018
Last Verified: April 2018

Keywords provided by University of Oklahoma:
Inappropriate Sinus Tachycardia
Inappropiate Tachycardia
Sinus Tachycardia
Palpitations
Fast Heart rate

Additional relevant MeSH terms:
Tachycardia
Tachycardia, Sinus
Arrhythmias, Cardiac
Heart Diseases
 Cardiovascular Diseases
Pathologic Processes
Tachycardia, Supraventricular