ABSTRACT
BACKGROUND: The electrophysiologic characteristics of decrementally conducting accessory pathways (APs) are well described; however, little is known about decrementally conducting APs caused by the radiofrequency ablation of a rapidly conducting AP. OBJECTIVE: To report the clinical, electrocardiographic, and electrophysiologic characteristics of 6 patients who developed a decremental AP after an attempt at ablation. METHODS: We compared the clinical and electrophysiologic characteristics of 295 consecutive patients with the Wolff-Parkinson-White syndrome who underwent radiofrequency ablation of 311 manifest APs (group A) with those of 6 patients with the Wolff-Parkinson-White syndrome in whom a decrementally conducting AP was detected after an attempt at ablation. RESULTS: The AP ablation site in group B patients was at the coronary sinus ostium region in 3 patients, middle cardiac vein in 2 patients, and left posteroseptal region in 1 patient. Sixty-two bypass tracts in group A patients and all 6 in group B patients were ablated at these locations, while 249 bypass tracts in group A patients and none in group B patients were ablated elsewhere (P = .0001). Five of the 6 patients (83%) with acquired Mahaim physiology had an AP located in the venous system. The odds for developing an acquired decremental antegrade atrioventricular AP when it was located inside the venous system were 1 in 6. All group B decremental APs were sensitive to adenosine, but none in 85 group A patients (P <.0001). CONCLUSIONS: The risk for developing decremental conduction after the ablation of a rapidly conducting AP is greater for APs inside the coronary venous system. Acquired decremental antegrade atrioventricular APs are electrophysiologically similar to de novo ones. They are capable of being part of an arrhythmia circuit and, therefore, should be targeted for ablation.
Subject(s)
Accessory Atrioventricular Bundle/physiopathology , Catheter Ablation/adverse effects , Electrocardiography/methods , Electrophysiological Phenomena/physiology , Pre-Excitation, Mahaim-Type/etiology , Wolff-Parkinson-White Syndrome/surgery , Adolescent , Adult , Aged , Aged, 80 and over , Child , Female , Follow-Up Studies , Humans , Male , Middle Aged , Postoperative Complications , Pre-Excitation, Mahaim-Type/diagnosis , Pre-Excitation, Mahaim-Type/physiopathology , Prognosis , Retrospective Studies , Young AdultABSTRACT
O coriocarcinoma primário de ovário é um tumor raro que se origina de células germinativas, apresentando-se, na maioria das vezes, associado a outros tumores também de origem de células germinativas. Será descrito um caso de coriocarcinoma primário de ovário em uma menina de 10 anos que apresentava um quadro de sangramento vaginal e distensão abdominal. Após serem dosados os marcadores tumorais, que mostraram níveis de beta-HCG (gonadotrofina coriônica humana) e CA-125 altos, e alfafetoproteína normal, e ser realizado ultrassonografia abdominal, a paciente foi submetida a tratamento cirúrgico. O exame histopatológico da peça cirúrgica e a imunohistoquímica foram compatíveis com diagnóstico de coriocarcinoma primário de ovário. Depois da cirurgia, apaciente evoluiu mal, indo a óbito no primeiro dia de pós-operatório devido a uma embolia tumoral pulmonar. Concluiu-se, então, que essa neoplasia é bastante agressiva, causando metástase precoce na maioria dos casos e apresentando prognóstico desfavorável, principalmente em jovens abaixo de 20 anos de idade.
