ABSTRACT
Background: Obesity is a risk factor for atrial fibrillation (AF). Data regarding left atrial (LA) remodeling in obese patients are scarce. Whether obesity favors AF recurrence after catheter ablation (CA) is still controversial. We assessed the distribution of epicardial atrial fat on computed tomography (CT), LA bipolar voltage, low-voltage zone (LVZ) extent, and the outcome of voltage-guided ablation of persistent AF in obese and non-obese patients. Methods: A total of 139 patients with persistent AF undergoing a first voltage-guided ablation were enrolled and divided into two groups: 74 were non-obese and 65 were obese. Epicardial adipose tissue (EAT) was assessed on a CT scanner. LA endocardial voltage maps were obtained using a 3D mapping system in sinus rhythm. LVZ was defined as a bipolar peak-to-peak voltage amplitude <0.5â mV. Results: LA volume, voltage, and EAT amount were similar in the two groups. LVZ was less frequent in obese patients [12 (18.8%) vs. 26 (35.1%), p = 0.05], particularly on the anterior wall. The posterior and lateral EATs were correlated with posterior and lateral LVZ extent, respectively, in obese patients. After 36 months of follow-up, the AF-free survival rate was similar. Lateral EAT [odds ratio (OR) 1.21, 95% confidence interval (CI) 1-1.4, p = 0.04] and P-wave duration (OR 1.03, 95% CI 1-1.05, p = 0.03), but not body mass index (BMI), were predictors of AF recurrence after CA. Conclusion: In obese patients, LVZ was less marked than in non-obese patients with similar LA volumes, voltage, and EAT amounts. In obese patients, posterior and lateral EATs were correlated with posterior and lateral LVZ extents. Obese patients had a similar and favorable 36-month outcome after AF ablation. BMI was not predictive of AF recurrence.
ABSTRACT
Background: Gender-related differences have been reported in atrial fibrotic remodeling and prognosis of atrial fibrillation (AF) patients after ablation. We assessed in persistent AF the regional distribution of left atrial (LA) bipolar voltage and the extent of low-voltage zones (LVZ) according to gender as well as the results of a voltage-guided substrate ablation. Methods: Consecutive patients who underwent a voltage-guided AF ablation were enrolled. LA endocardial voltage maps were obtained using a 3D electro-anatomical mapping system in sinus rhythm. LVZ was defined as <0.5â mV. Results: A total of 115 patients were enrolled (74 men, 41 women). The LA bipolar voltage amplitude was twice lower in the whole LA (p < 0.01) and in each atrial region in women compared with men, whereas the LA indexed volume was similar. LVZ were found in 56.1% of women and 16.2% of men (p < 0.01). LVZ were also more extensive in women (p = 0.01), especially in the anterior LA. Atrial voltage alteration occurred earlier in women than in men. In a multivariate analysis, the female sex (OR 12.99; 95% CI, 3.23-51.63, p = 0.0001) and LA indexed volume (OR 1.09; 95% CI, 1.04-1.16, p = 0.001) were predictive of LVZ. Atrial arrhythmia-free survival was similar in men and women 36 months after a single ablation procedure. Conclusion: The study reports a strong relationship between the female gender and atrial substrate remodeling. The female gender was significantly associated with higher incidence, earlier occurrence, and greater extent of LVZ compared with men. Despite the female-specific characteristics in atrial remodeling, LVZ-guided ablation may improve the AF ablation outcome in women.
ABSTRACT
Background: Spontaneous coronary artery dissection (SCAD) is still an underdiagnosed condition that requires a detailed assessment of angiographic signs. It also shares similar clinical presentations with Takotsubo syndrome (TTS). The concomitant presentation of SCAD with TTS is a possible occurrence, making it difficult for clinicians to treat and manage. Case summary: This study included a 49-year-old woman with retrosternal chest pain who was admitted to the emergency department. Coronary angiography indicated Type 2A SCAD involving the middle part of the left anterior descending artery, while the left ventriculography indicated a typical left ventricular apical ballooning compatible with TTS. A conservative approach to the management of SCAD was observed. After a 3-month follow-up, the control coronary angiography showed a complete angiographic resolution. The results of the transthoracic echocardiogram (TTE) and cardiac magnetic resonance revealed a complete normalization of the pathological features. The patient remained asymptomatic and showed no recurrence of chest pain. Discussion: Although TTS and SCAD are commonly observed in patients who share certain characteristics (women, without atheromatous terrain, stress-related factors), it is difficult to establish a pathophysiological link between them. This observation confirms the non-random association of two rare entities of myocardial infarction with no obstructive coronary arteries. Although TTS can be easily diagnosed via non-invasive imaging, the diagnosis of SCAD is more difficult. The findings of this study suggest a concomitant presentation between SCAD and TTS. Although the treatment approach to SCAD is usually conservative, severe forms of this disease require early diagnosis and appropriate treatment.
