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EDITORIAL
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Do you have any advice to give to fellow afibbers?
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Survey Results – Part V
Analysis of Correlations One thing is quite obvious. There is a very large variability in the severity of the LAF between respondents; this, unfortunately, makes it difficult to reach conclusions that are valid in strict statistical terms, but we certainly can spot trends. We have gathered data on 3 measures of severity of the condition: the number of episodes within the last 6 months, the average duration of these episodes, and the total time spent in fibrillation over the past 6 months.
Severity of Episodes There is a strong, statistically significant correlation between time spent in afib and the number of episodes experienced over a 6-month period (r=0.5924 p=0.0001). Adrenergic afibbers had an average of 14 episodes in 6 months (range: 0-90), vagal afibbers 17 episodes (range: 0-150), and those with the mixed variety 24 episodes (range: 0-125). The correlation between the average duration of the episodes and total time spent in fibrillation is much less pronounced. There is a slight upward trend, but it is not statistically significant. The average episode lasted 11 hours for the mixed group (range: 0-37 hrs), 15 hours for the vagal group (range: 0-168 hrs), and 20 hours for the adrenergic group (range: 0-72 hrs).
Effect of Age
Effect of Gender Only 1 woman had the vagal variety of LAF with the remaining 9 being evenly split between adrenergic, mixed, and chronic. Women with LAF (at least those that responded to the survey) were significantly older than men with LAF. The average age for the women was 66.3 years while that of the men was 51.2 years. This difference was statistically significant (p=0.0002). Women spent less time in fibrillation (over a 6-month period) than did men (43 hours versus 156 hours on the average). They also had fewer episodes (8 versus 18) and the average duration of their episodes was less than those of men (4 hours versus 17 hours). It was not possible to establish the statistical significance of these differences due to the small size of the group of women with paroxysmal LAF. There was no significant difference in the percentage of women and men who were taking antiarrhythmics (71% versus 62%).
Effect of Years of LAF
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The Surgical Options for LAFLone atrial fibrillation, by definition, is not a heart disease as such, but rather a combination of an imbalance in the autonomic nervous system and the presence of easily excitable heart tissue. Because the symptoms of LAF involve the heart the disorder is usually treated by cardiologists or electrophysiologists and little attention is paid to correcting the autonomic nervous system imbalance. The current treatment options for LAF are therefore almost exclusively directed towards “numbing” the excitable heart tissue with pharmaceutical drugs (antiarrhythmics), eradicating the offending heart tissue with radio frequency ablation, or carving intricate channels of scar tissue on the surface of the heart to direct electrical impulses along a specific path (maze procedure). The use of beta-blockers and antiarrhythmics with beta-blocking properties (propafenone, amiodarone and sotalol) is an attempt to address the autonomic system imbalance. This approach blocks the heart’s receptors for norepinephrine. While sometimes beneficial for afibbers with the adrenergic variety, this treatment is precisely wrong for people with the vagal variety.
The mechanism of atrial fibrillation As long as it is only the impulses originating in the SA node that reach the AV node everything is fine. It is when extraneous impulses are generated in the atrium that trouble (fibrillation) can occur. Extraneous impulses can be generated by an overactive sympathetic nervous system (adrenergic), an overactive parasympathetic system (vagal) or simply by an agglomeration of “rogue” heart cells that decide to start a beat of their own (ectopic beats). A combination of rogue cells and an imbalanced autonomic nervous system is another possibility. The aim of ablation or surgery (maze procedure) is to ensure that only the impulses from the SA node reach the AV node or, in the case of AV node ablation, to completely block any signals originating from the SA node or elsewhere and replace them with signals from an artificial pacemaker. The first step on the road to ablation is the electrophysiology study.
The electrophysiology study (EPS) The study can be somewhat uncomfortable and can last from one to three hours. At the end of it the electrophysiologist may report “nothing to ablate” if he has not located any foci of rogue cells or he may go directly to the next step and ablate the active area(s).
Radio frequency (RF) ablation The ablation procedure is generally fairly painless (except for the $30,000 US cost) and lasts four hours or less. Its success rate for atrial fibrillation is currently around 80%, but with improved mapping and ablation techniques this is bound to improve[2,3]. There are potential adverse events though[4]:
As with any invasive procedure, the key to success is an experienced surgeon with lots of successful procedures to his credit.
AV node ablation
AV node ablation is performed in much the same way as the RF ablation except that it is the area around the node that is ablated. A recent study found the procedure to be relatively safe for patients with lone atrial fibrillation[5].
The maze procedure Nevertheless, if performed by a competent surgeon, the procedure is very effective in eliminating atrial fibrillation. Dr. James Cox at the Georgetown Cardiovascular Institute developed maze surgery. During the past 10 years Dr. Cox has operated on 346 patients with a 94% success rate[8]. Swedish surgeons recently reported that the quality of life of 48 patients (80% with lone AF) who had undergone maze surgery improved very significantly after the procedure to equal the level of a healthy Swedish population. Nevertheless, 12 patients had fairly serious complications. Two required a permanent pacemaker installed and three needed a temporary pacemaker. None of the patients died during one year of follow up[9]. In conclusion, the maze procedure, although very effective for lone atrial fibrillation, is very major surgery and probably best left alone unless you are really desperate and can find a surgeon who has performed many successful ones.
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Supplements for AfibbersThere are many supplements that may be useful for lone afibbers. The first order of business is to make sure that you have an adequate intake of the vitamins, antioxidants, and minerals required to promote overall health and well-being. Many physicians still believe you can get all the vitamins and minerals you need from a varied diet. This may be true if you eat only organic produce and meats “brought up” in a healthy soil replete with minerals, live in an unpolluted environment, drink pure spring water, and have little, if any, physical or psychological stress. For the rest of us a daily multivitamin is a must. For basic support you require the following daily intake of vitamins and essential minerals: Vitamins
** men and most postmenopausal women rarely need supplemental iron In addition you need to make sure that your intake of the two major antioxidants, vitamins C and E, is adequate. Supplementation with the water-soluble vitamin C should be spread throughout the day (500 mg of ascorbic acid or calcium ascorbate with each meal is a common recommendation). Vitamin E can be taken just once a day (400-800 IU per day of natural vitamin E [d-alpha-tocopherol or d-alpha-tocopherol acetate or succinate] is a common recommendation).
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References
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The AFIB REPORT is published monthly by Hans R. Larsen MSc ChE 1320 Point Street Victoria, BC, Canada V8S 1A5 Phone: (250) 384-2524 E-mail: [email protected] URL: http://www.afibbers.org Copyright © 2002 by Hans R. Larsen
The AFIB REPORT does not provide medical advice. Do not attempt self-diagnosis or self-medication
based on our reports. |