Document Detail


Effects of body position and exercise on evoked response signal for automatic threshold activation.
MedLine Citation:
PMID:  10588149     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The Autocapture function controls and optimizes the output of the ventricular pulse amplitude automatically. For this reason an automatic test has to be performed during follow-up to measure the evoked response signal and lead polarization for the calculation of the appropriate evoked response sensitivity setting. The aim of the study was to assess whether body position and exercise influence the evoked response and polarization. Both parameters were determined in the supine and upright position and subsequently during supine and upright symptom-limited ergometry. The study included 14 patients with the VVIR pacemaker Regency SR+ who had received the ventricular pacing leads Membrane E 1450 T (n = 8), CapSure Z 5034 (n = 4), or SX 60 (n = 2). The evoked response signal was 7.4 +/- 3.3 mV during supine and increased to 9.7 +/- 5.6 mV (+35%) during upright position (P < 0.05). The exercise tests were terminated at 105 +/- 36 W (supine) and 110 +/- 34 W (upright). There was a gradual insignificant decrease of the evoked response during each exercise test with a mean decrease of -1.1 +/- 0.9 mV (-15%; supine) and -1.6 +/- 2.1 mV (-16%; upright). The evoked response increased within 5 minutes during recovery to the initial values. Polarization remained unchanged during both tests. The pacemaker did not recommend activating autocapture in four patients who all had received high-ohmic pacing leads. In conclusions, the measurement of the evoked response in supine position seems to represent the worst case. Physical activities did not effect autocapture function in patients with the recommended lead, but the pacemaker did not always recommend Autocapture activation in some patients with high-ohmic pacing leads.
Authors:
A Schuchert; R Ventura; T Meinertz
Related Documents :
8438899 - Induction of hypomagnesemia during amsacrine treatment.
2463539 - A new algorithm for a high level of protection against pacemaker-mediated tachycardia.
24457999 - Doubling of muscle carnosine concentration does not improve laboratory 1-h cycling time...
2606329 - Experimental cardio-depressant effects of clonixin.
15851289 - Long-term changes in sequence of atrial activation and refractory periods: no evidence ...
24263659 - The effects of acute l-carnitine supplementation on endurance performance of athletes.
2932419 - Effect of swimming training on cardiac function and myosin atpase activity in shr.
9016479 - Sports, exercise, and other causes of injuries: results of a population survey.
18471449 - Effect of exercise training in supervised cardiac rehabilitation programs on prognostic...
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Pacing and clinical electrophysiology : PACE     Volume:  22     ISSN:  0147-8389     ISO Abbreviation:  Pacing Clin Electrophysiol     Publication Date:  1999 Oct 
Date Detail:
Created Date:  2000-02-18     Completed Date:  2000-02-18     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  7803944     Medline TA:  Pacing Clin Electrophysiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1476-80     Citation Subset:  IM; S    
Affiliation:
Medical Clinic, Department of Cardiology, University-Hospital Eppendorf, Hamburg, Germany.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Aged
Cardiac Pacing, Artificial*
Electrocardiography
Exercise / physiology*
Female
Heart Ventricles / physiopathology*
Humans
Middle Aged
Posture / physiology*
Signal Processing, Computer-Assisted
Supine Position / physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Evolution of QRS duration after myocardial infarction: clinical consequences.
Next Document:  External exponential biphasic versus monophasic shock waveform: efficacy in ventricular fibrillation...