Targeted cluster ablation of non-CTI-dependent atrial arrhythmias in congenital heart disease using ultrahigh-definition mapping.

BACKGROUND: Ablation of atrial arrhythmias in patients with congenital heart disease (CHD) has markedly improved with advanced mapping systems. However, recurrence rates remain high. The linear ablation strategy is not uncommonly practiced necessitating prolonged ablation times. We report the outcomes of adopting a strategy of minimal, cluster delivery of radiofrequency (RF) energy at critical substrates identified by ultrahigh-definition mapping for atrial arrhythmias in patients with CHD. METHODS: Non-cavotricuspid isthmus (non-CTI) atrial tachycardias were ablated with a targeted ablation cluster technique (TACT) using an ultrahigh-density mapping system combined with multielectrode monitoring and endpoint determination in preference to linear ablation. The arrhythmia substrates, RF times, and acute- and medium-term success rates were studied. RESULTS: Fifty-eight tachycardias were mapped and ablated in 42 procedures: 34 non-CTIs and 24 CTIs. A targeted ablation cluster was performed for non-CTI tachycardias, with a median ablation time of 3.1 min. In 53% of non-CTI tachycardias, arrhythmia termination was achieved with ≤2 RF applications. After a mean follow-up of 23.6 months, 27 (80%) patients were free of recurrent atrial arrhythmias. One of 34 targeted non-CTI tachycardia recurred, with a final success rate of 91%. Linear ablation was performed for CTI flutters with a median ablation time of 6.8 min (vs. non-CTIs, p = .006). Three of 21 tachycardias recurred due to reconnection of the ablation line but the final success rate was 100%. CONCLUSIONS: The TACT approach for non-CTI atrial arrhythmias in congenital patients as guided by the ultrahigh-density mapping is an effective method with short ablation times and excellent medium-term outcomes.

Working as a Healthcare Professional at Island Primary Care: An Exploratory Qualitative Study on the Cyclades Islands, Greece.

Improving the quality of and access to healthcare services in rural areas is fundamental to developing sustainable healthcare systems. This research aims to explore the motivations of healthcare professionals to work and settle in rural island areas of Greece with limited access to secondary and tertiary care. The study suggests practical ways to encourage self-motivation and attract more health workers in rural areas. An exploratory qualitative research approach was employed, involving semi-structured interviews with 16 healthcare professionals working in primary-care units that lack direct hospital or hospital-health centre access. The research was conducted specifically in the rural islands of the Cyclades. Thematic analysis was conducted to identify common themes and unique insights from the participants. The analysis revealed three thematic categories. Τhe «attraction¼ thematic was influenced by personal factors, random selection, origin, accommodation factors, professional factors, and obligatoriness. The «recruitment¼ thematic was associated with understaffing, special care issues, an unstable working environment, educational and organisational aspects, and an insular lifestyle. The thematic of «retention¼ highlighted personal issues, accommodation difficulties, economic and work-related issues, and unique challenges posed by an insular lifestyle. This research provides valuable insights into the motivations that drive healthcare professionals to settle, work, and remain in remote island units, as well as the challenges they encounter in making this decision. The study proposes strategies to motivate and attract more healthcare professionals to rural areas. These findings should be considered when formulating or reviewing primary healthcare empowerment policies to ensure equitable healthcare access for all individuals.

Effects of multielectrode renal denervation on cardiac and neurohumoral adaptations in resistant hypertension with cardiac hypertrophy: an EnligHTN I substudy.

OBJECTIVE: This EnligHTN I nonrandomized substudy investigated the effect of multielectrode renal denervation (RDN) on cardiac and neurohumoral adaptations. METHODS: Eighteen patients with true drug-resistant hypertension [age: 56 ±â€Š10 years, 12 men, BMI: 33.6 ±â€Š5.4 kg/m, office blood pressure (BP) by automatic device (Omron): 182 ±â€Š19/97 ±â€Š18 mmHg and ambulatory BP (Spacelabs): 153 ±â€Š16/87 ±â€Š15 mmHg receiving 4.5 antihypertensive drugs/day] and left ventricular hypertrophy underwent multielectrode RDN (EnligHTN system; St. Jude Medical), whereas 10 patients served as controls. Both groups were followed-up for 6 months. RESULTS: Demographic data were homogenous between both patient groups. In addition to reduction of office (-42/-17 mmHg, P < 0.001) and ambulatory (-19/-9 mmHg, P < 0.001) BP, RDN contributed to attenuation of left ventricular mass index from 140.0 ±â€Š17.0 g/m (57.9 ±â€Š7.9 g/m) to 126.7 ±â€Š19.2 g/m (52.6 ±â€Š8.4 g/m) (P < 0.01 for both) and left atrial diameter from 42.4 ±â€Š4.3 to 40.6 ±â€Š3.6 mm (P = 0.004) at 6 months. Up to 56% of the RDN-group patients achieved a target of less than 140/90 mmHg in the office BP; proportion of RDN-group patients with concentric left ventricular hypertrophy had decreased by 39%; mitral lateral E/E' ratio decreased from 14.8 ±â€Š6.1 to 12.0 ±â€Š3.2 (P = 0.016); isovolumic relaxation time shortened from 109.8 ±â€Š16.2 to 100.8 ±â€Š17.1 ms (P = 0.003); and N-terminal pro B-type natriuretic peptide levels reduced from 84.9 ±â€Š35.9 to 57.2 ±â€Š38.8 pg/ml (P < 0.001) significantly at 6 months post-RDN. Control patients exhibited no significant changes in all the above parameters (P > 0.05) at 6 months. CONCLUSION: Multielectrode RDN contributes to improvement of diastolic dysfunction, reduction of left ventricular mass and attenuation of NT-proBNP, suggesting additional cardiovascular benefits in drug-resistant hypertension associated with left ventricular hypertrophy.

A hypertensive response to exercise is prominent in patients with obstructive sleep apnea and hypertension: a controlled study.

Blood pressure (BP) behavior during exercise is not clear in hypertensive patients with obstructive sleep apnea (OSA). The authors studied 57 men with newly diagnosed essential hypertension and untreated OSA (apnea-hypopnea index [AHI] ≥5) but without daytime sleepiness (Epworth Sleepiness Scale score ≤10), and an equal number of hypertensive controls without OSA matched for age, body mass index, and office systolic BP. All patients underwent ambulatory BP measurements, transthoracic echocardiography, and exercise treadmill testing according to the Bruce protocol. A hypertensive response to exercise (HRE) was defined as peak systolic BP ≥210 mm Hg. Patients with OSA and control patients had similar ambulatory and resting BP, ejection fraction, and left ventricular mass. Peak systolic BP was significantly higher in patients with OSA (197.6±25.6 mm Hg vs 187.8±23.6 mm Hg; P=.03), while peak diastolic BP and heart rate did not differ between groups. Furthermore, an HRE was more prevalent in patients with OSA (44% vs 19%; P=.009). Multiple logistic regression revealed that an HRE is independently predicted by both the logAHI and minimum oxygen saturation during sleep (odds ratio, 3.94; confidence interval, 1.69-9.18; P=.001 and odds ratio, 0.94; confidence interval, 0.89-0.99; P=.02, respectively). Exaggerated BP response is more prevalent in nonsleepy hypertensives with OSA compared with their nonapneic counterparts. This finding may have distinct diagnostic and prognostic implications.

Catheter-based renal sympathetic denervation for the treatment of resistant hypertension: first experience in Greece with significant ambulatory blood pressure reduction.

We describe the first two cases in Greece of catheter-based renal sympathetic denervation (RSD) by means of radiofrequency ablation. The procedure was performed on middle-aged men with long-standing resistant hypertension (office blood pressure, BP 195/115 mmHg and ambulatory BP 190/110 mmHg; office BP 170/95 mmHg and ambulatory BP 151/87 mmHg) under optimal medical therapy. The percutaneous RSD was completed successfully, and led to a significant reduction in both office and ambulatory BP at 3 weeks, with no vascular complications, while renal function remained unaltered. These cases of RSD suggest that renal nerve ablation for the treatment of resistant hypertension constitutes an effective and safe therapeutic modality, accompanied by significant reduction of ambulatory BP, and broadening of its clinical use in our country is of clinical importance.

Resistant hypertension and obstructive sleep apnea: the sparring partners.

Enhanced target organ damage and cardiovascular morbidity represent common issues observed in both resistant hypertension and obstructive sleep apnea. Common pathophysiological features and risk factors justify their coexistence, especially in individuals with increased upper-body adiposity. Impaired sodium handling, sympathetic activation, accelerated arterial stiffening, and impaired cardiorenal hemodynamics contribute to drug-resistant hypertension development in obstructive sleep apnea. Effective CPAP therapy qualifies as an effective "add-on" to the underlying antihypertensive pharmacological therapy, and emerging evidence underlines the favorable effect of mineralocorticoid antagonists on both resistant hypertension and obstructive sleep apnea treatment.