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  • Author or Editor: A. Apor x
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In animal models, unaccustomed eccentric exercise (EE) has been widely related to muscle fiber membrane (sarcolemma) damage. On the contrary, studies in humans reported that sarcolemma was not susceptible to damage following a single bout of EE. We hypothesized that the single bout of EE used by those studies was not sufficient to induce sarcolemma damage, in humans. In this study we examined muscle biopsies from untrained males who either performed six sets of 15 reps of maximum voluntary eccentric contractions (n=9), for six consecutive days, or served as control-group (n=6). Blood and biopsy samples were obtained one week prior to exercise, immediately after bout 3, and 24h after the last training session. In addition to standard haematoxylin-eosin staining, all biopsies were stained immunohistochemically using antibodies specific for fibronectin and desmin antigens. In the exercise-group, no biopsies taken at pre-exercise or post-exercise level showed evidence of sarcolemma damage as stained by anti-fibronectin antibody in eight of nine subjects. Serum creatine kinase (CK) and lactate dehydrogenase (LDH) activities increased significantly throughout the study despite the lack of sarcolemma damage.We suggest that in humans, repeated bouts of EE do not cause gross sarcolemma damage in the mid-belly of Vastus Lateralis.

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Abstract

Background

Real-time three-dimensional transesophageal echocardiography (RT 3D TEE) is a novel method providing high spatial and temporal resolution imaging of the heart. During pulmonary vein isolation procedures visualization of the atria, interatrial septum and the ablation catheter is of high importance to increase safety. RT 3D TEE might be a useful tool to guide left atrial ablations.

Case report

A 53-year-old man was referred to our hospital to undergo pulmonary vein isolation procedure for the treatment of symptomatic drug-refractory paroxysmal atrial fibrillation. The transseptal puncture was performed under RT 3D TEE-guidance with direct visualization of the interatrial septum and fossa ovalis. RT 3D TEE provided a three-dimensional view of the puncture with “tenting”-sign and the transseptal needle-fossa ovalis angle enhancing the manipulation of the ablation catheter within the left atrium. The ablation catheter was visualized and tracked during the procedure. No adverse events occurred during the procedure.

Conclusion

Our case report demonstrates the feasibility of RT 3D TEE-guided atrial fibrillation ablation procedures. Safety profile might be improved by the real-time direct view of fossa ovalis. Decrease in fluoroscopy time can be achieved by visualizing the ablation catheter during the procedure.

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