Haemodynamic consequences of targeted single- and dual-site right ventricular pacing in adults with congenital heart disease undergoing surgical pulmonary valve replacement

Aims The purpose of this study was to create an epicardial electroanatomic map of the right ventricle (RV) and then apply post-operative-targeted single- and dual-site RV temporary pacing with measurement of haemodynamic parameters. Cardiac resynchronization therapy is an established treatment for symptomatic left ventricular (LV) dysfunction. In congenital heart disease, RV dysfunction is a common cause of morbidity—little is known regarding the potential benefits of CRT in this setting. Methods and results Sixteen adults (age = 32 ± 8 years; 6 M, 10 F) with right bundle branch block (RBBB) and repaired tetralogy of Fallot (n = 8) or corrected congenital pulmonary stenosis (n = 8) undergoing surgical pulmonary valve replacement (PVR) for pulmonary regurgitation underwent epicardial RV mapping and haemodynamic assessment of random pacing configurations including the site of latest RV activation. The pre-operative pulmonary regurgitant fraction was 49 ± 10%; mean LV end-diastolic volume (EDV) 85 ± 19 mL/min/m2 and RVEDV 183 ± 89 mL/min/m2 on cardiac magnetic resonance imaging. The mean pre-operative QRS duration is 136 ± 26 ms. The commonest site of latest activation was the RV free wall and DDD pacing here alone or combined with RV apical pacing resulted in significant increases in cardiac output (CO) vs. AAI pacing (P < 0.01 all measures). DDDRV alternative site pacing significantly improved CO by 16% vs. AAI (P = 0.018), and 8.5% vs. DDDRV apical pacing (P = 0.02). Conclusion Single-site RV pacing targeted to the region of latest activation in patients with RBBB undergoing PVR induces acute improvements in haemodynamics and supports the concept of ‘RV CRT’. Targeted pacing in such patients has therapeutic potential both post-operatively and in the long term

169 Does atrial differences in endothelium damage, leukocyte and platelet activation contribute to chamber specific thrombogenic status in patients with atrial fibrillation?

BackgroundIn atrial fibrillation (AF), the reasons why most of the thrombi form in the left atrium are mainly unknown. In the vasculature, endothelial damage together with platelet activation and inflammation contribute to initiation of blood coagulation and thrombus growth.ObjectiveThe purpose of this study was to investigate whether atrial-specific differences in endothelial damage, leukocyte activation, platelet stimulation occur in patients with AF.MethodsTwenty patients (15 men, 5 women; age 55±8 years, 15 paroxystic AF, 5 persistent AF) with AF undergoing ablation were investigated. Blood samples from the left and right atrium were obtained at the start of the procedure. Procoagulant microparticles (MPs), reliable markers of vascular damage were measured by capture assays. Their procoagulant abilities were quantified by functional prothrombinase assay and their cellular origin were determined (endothelium, platelet, leukocyte). In addition, platelet reactivity was evaluated by whole blood flow cytometry for expression of platelet Pselectin (CD62P), active glycoprotein IIbIIIa receptor (PAC-1). Platelet aggregation was evaluated using Arachidonic acid (AA), ADP, TRAP and collageninduced whole blood aggregometry.ResultsNo atrial-specific differences in the levels of total procoagulant MP, leukocyte-derived-MP and platelet-derived MP could be evidenced. Conversely, endothelial-derived MPs (CD105+) were slightly elevated in the right atrium (RA 0.96±0.53 vs. LA 0.80±0.45nm PhtdSer Eq.; p=0.041). Likewise, collagen-induced platelet aggregation was evidenced in the right atrium (Collagen 1mg/l RA: 48±33% vs LA 37±29%; p 0.035; collagen 2,5mg/l RA: 76±25% vs LA: 60±29%; p=0.001).ConclusionsIn patients with AF, endothelial damage and collageninduced platelet aggregation appear slightly more pronounced in the right atrium. Our data did not substantiate the view that chamber specific enhanced thrombogenic status could be a reliable explanation for the increased propensity for thrombus formation observed in the left atrium in AF patients

Pacing for complete heart block in pregnancy

Whereas sinus tachycardia and paroxysmal supraventricular tachycardia are common during pregnancy, bradyarrhythmias are infrequent. Moreover, bradyarrhythmias are generally well tolerated during pregnancy. Nevertheless, a 12-lead ECG is indicated for pregnant women who present with bradycardia, to rule out sinoatrial (SA) node dysfunction or AV conduction abnormalities. Third-degree AV block (complete heart block, CHB) requires multidisciplinary care during pregnancy, with combined input from Cardiologists and Obstetricians. As CHB is associated with increased mortality and morbidity if left untreated, permanent pacing is usually indicated during pregnancy, even if the patient remains asymptomatic. However, not all pregnant patients with CHB require urgent pacing. In a pregnant patient who has CHB with an escape rhythm with narrow QRS complexes and rate of &gt;50bpm, permanent pacemaker implantation can be delayed until after delivery, as described in this case report

Pacing-Induced Alterations in Left Ventricular Mechanical Properties: Effect of Pacing Sites

ope

Propranolol, infantile haemangiomas, and serendipity : new use for an old drug

Capillary haemangiomas are benign lesions that may occur anywhere on the skin, may grow rapidly in the first two years of life and may impair vital organs. Propranolol has been recently discovered to shrink these lesions effectively. We report the first such patient treated in Malta with this drug.peer-reviewe

Periprocedural Considerations During Implantation of ICD In A Patient With Dextrocardia

In this case report we present a patient with dextrocardia, who undergone implantation of dual chamber implantable cardioverter-defibrillator (ICD). Here we aimed to underline several specific considerations which must be noted when one considers to implant an ICD in a patient with dextrocardia

Accidental tramadol ingestion in children admitted in tertiary care centre

Background: Tramadol use has been increasing in the adult and pediatric population. Practitioners must be alert because Tramadol misuse can lead to severe intoxication in which respiratory failure and seizures are frequent. Overdoses can lead to death. We report 47 pediatric cases with history of accidental tramadol exposure in children.Methods: An observational, retrospective, single center case -series of children with a history of accidental tramadol exposure in children admitted in pediatric intensive care unit of tertiary care center, Niloufer Hospital (Osmania Medical College) Hyderabad, Telangana India.Results: Of 47 children, 22 (47%) are male and 25 (53%) were female. At presentation 11 (23%) had loss of consciousness, 14 (29%) seizures, 17 (36%) hypotonia was noted. Pupils were miotic in 22 (47%) mydriatic in 2 (4.2%) normal in rest of children. Hemodynamic instability noted in 13 (27.6%). Serotonin syndrome (tachycardia, hyperthermia, hypertension, hyper reflex, clonus) was noted on 5 (10.6%) children. Respiratory depression was seen in 4 (8%) children who needed ventilatory support. Antidote Naloxone was given in 7 children. No adverse reaction was noted with Naloxone. All 47 children were successfully discharged.Conclusions: Overdoses can lead to death and practitioners must be alert because of the increasing use of tramadol in the adult and pediatric population. The handling of the tramadol should be explained to parents and general population and naloxone could be efficient when opioid toxicity signs are present

A National Survey of Teachers on Antiretroviral Therapy in Malawi: Access, Retention in Therapy and Survival

BACKGROUND: HIV/AIDS is having a devastating effect on the education sector in sub-Saharan Africa. A national survey was conducted in all public sector and private sector facilities in Malawi providing antiretroviral therapy (ART) to determine the uptake of ART by teachers and their outcomes while on treatment. METHODOLOGY/PRINCIPAL FINDINGS: A retrospective cohort study was carried out based on patient follow-up records from ART Registers and treatment master cards in all 138 ART clinics in Malawi; observations were censored on September 30(th) 2006. By this date, Malawi's 102 public sector and 36 private sector ART clinics had registered a total of 72,328 patients for treatment. Of these, 2,643 (3.7%) were teachers. Adjusting for double-registration caused by clinic transfers, it is estimated that 2,380 individual teachers had ever accessed ART. There were 15% of teachers starting ART in WHO clinical stage 1 or 2 with a CD4-lymphocyte count of <or=250/mm(3) and 85% starting in stage 3 or 4. By 30(th) September 2006, 1,850 teachers were alive on ART (3.5% of all teachers in Malawi). The probability of being alive on ART at 6-months, 12-months, 18-months and 24-months after treatment initiation was 84%, 79%, 75% and 73% respectively. Retention in treatment was better for women (adjusted HR = 1.8) and in those starting ART in WHO Clinical Stage 1 and 2 (adjusted HR = 1.8). CONCLUSION/SIGNIFICANCE: Rapid scale up of ART has allowed 2,380 HIV-positive teachers to access life-prolonging treatment. There is evidence that this intervention can help to mitigate some of the shortages of teaching personnel in resource-poor countries affected by a generalised HIV epidemic