Current practice and effects of intravenous anticoagulant therapy in hospitalized acute heart failure patients with sinus rhythm.

Although the risk of thromboembolism is increased in heart failure (HF) patients irrespective of atrial fibrillation (AF), especially during the acute decompensated phase, the effects of intravenous anticoagulants for these patients remain unclear. We sought to investigate the current practice and effects of intravenous anticoagulant therapy in acute HF (AHF) patients with sinus rhythm. We analyzed a nationwide prospective cohort from April 2012 to March 2016. We extracted 309,015 AHF adult patients. After application of the exclusion criteria, we divided the 92,573 study population into non-heparin [n = 70,621 (76.3%)] and heparin [n = 21,952 (23.7%)] groups according to the use of intravenous heparin for the first 2 consecutive days after admission. Multivariable logistic regression analyses demonstrated that heparin administration was not associated with in-hospital mortality (OR 0.97, 95% CI 0.91-1.03) and intracranial hemorrhage (OR 1.18, 95% CI 0.78-1.77), while heparin administration was significantly associated with increased incidence of ischemic stroke (OR 1.49, 95% CI 1.29-1.72) and venous thromboembolism (OR 1.62, 95% CI 1.14-2.30). In conclusion, intravenous heparin administration was not associated with favorable in-hospital outcomes in AHF patients with sinus rhythm. Routine additive use of intravenous heparin to initial treatment might not be recommended in AHF patients.

Autonomic functioning among cocaine-exposed kindergarten-aged children: Examination of child sex and caregiving environmental risk as potential moderators.

The purpose of this study was to examine the hypothesis that child sex moderates the association between prenatal cocaine exposure (PCE) and autonomic functioning as well as to examine the role that caregiving environmental risk played in sex differences in autonomic functioning among exposed children. Measures of the parasympathetic nervous system (indexed by respiratory sinus arrhythmia [RSA]) and the sympathetic nervous system (indexed by skin conductance level [SCL]) were obtained from 146 (75 cocaine-exposed, 38 male; and 71 nonexposed, 36 male) children during baseline and a task designed to elicit negative affect (NA). We also examined the role of caregiving environmental risk as a moderator of the association between PCE and autonomic functioning separately for boys and girls. PCE boys had a significantly higher baseline RSA and lower baseline SCL than PCE girls or nonexposed children. Environmental risk also moderated the association between PCE and baseline RSA for boys, but not girls, such that boys with PCE and high environmental risk had the highest baseline RSA. These findings indicate that exposed boys had significantly lower levels of sympathetic activation while at rest. However, for autonomic reactivity, the exposed girls had a larger change in both RSA and SCL relative to nonexposed girls while exposed boys had significantly smaller increases in SCL during environmental challenge. Finally, girls with both PCE and high environmental risk had the highest levels of parasympathetic reactivity during challenge. These results underscore the importance of examining sex differences and considering comorbid environmental risk factors when examining developmental outcomes in cocaine-exposed children and highlight the complexity involved with understanding individual differences in cocaine-exposed populations.

Restricción de crecimiento intrauterino probablemente asociado al uso de metoprolol: reporte de caso / Intrauterine growth restriction probably associated with the use of metoprolol: a case report

Se presenta el caso de una paciente vinculada al programa de atención prenatal de una entidad promotora de salud (EPS). Se trata de una femenina de 30 años de edad, con embarazo de 20.5 semanas por fecha de última menstruación, con extrasístoles ventriculares aisladas sin fenómenos repetitivos y taquicardia sinusal inapropiada. A los 31 días de iniciado el tratamiento con metoprolol 25mg cada 12 horas vía oral, el feto presentó disminución progresiva del crecimiento. La restricción del crecimiento intrauterino fue el principal hallazgo durante los sesenta y tres días de uso de metoprolol. Se realizó una evaluación por la sospecha de evento adverso, utilizando el algoritmo de Naranjo y se determina que los efectos de metoprolol en el crecimiento intrauterino fetal eran plausibles (categoría probable). Se realiza la intervención para la suspensión del metoprolol y se observa ganancia de peso progresiva. Se logró un feto con adecuado peso al nacer

This is the case of a patient who was attended by a health care entity. She was a 30-year-old patient and 20.5 weeks pregnant according to the first day of the last menstrual period. She was diagnosed by a cardiologist with isolated ventricular extra-systoles without repetitive phenomena and inappropriate sinus tachycardia. After 31 days being treated with oral metoprolol 25mg bid, the fetus showed a progressive decline of growth rate. The intrauterine growth restriction was the main clinical finding during the sixty-three days of metoprolol consumption. Naranjo algorithm was used to evaluate the causality of the adverse event. It was determined that the effects of metoprolol on fetal intrauterine growth were plausible (probable). Metoprolol was ceased. Then a progressive borned of weight was observed. A fetus with adequate birth weight was achieved

Digoxina en insuficiencia cardíaca reducida y ritmo sinusal. ¿Cuándo debemos indicarla en el año 2018? / Digoxin in reduced heart failure and sinus rhythm. When should it be indicated in 2018?

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Seguridad y eficacia de vernakalant en la práctica clínica de los servicios de urgencias / Vernakalant in hospital emergency practice: safety and effectiveness

Objetivo. Describir la eficacia y seguridad de vernakalant para la reversión de la fibrilación auricular (FA) a ritmo sinusal en la práctica clínica habitual de los servicios de urgencias hospitalarios (SUH), así como evaluar las características asociadas a mayor respuesta eficaz. Método. Estudio de cohortes multicéntrico, analítico, prospectivo, con inclusión consecutiva de pacientes en los que se administra vernakalant para realizar cardioversión farmacológica de una FA, llevado a cabo desde Septiembre 2014 hasta Marzo 2016 en 5 hospitales de la Comunidad Valenciana. Resultados. Se analizaron 165 casos con una mediana de edad de 68 anos [rango intercuartil (RIC): 56-77]. La reversión eficaz fue de 77,6% (IC 95%: 71,1%-84,0%). La mediana del tiempo de reversión fue de 8 minutos (RIC: 6-12) con la primera dosis y de 34 minutos (RIC: 22-62) con la segunda. La presencia de insuficiencia cardiaca previa fue menos frecuente en el grupo que revirtió con vernakalant, 6,3% frente a 18,9%, con una OR ajustada de 0,45 (IC 95%: 0,13-1,56), p = 0,208. Ser un primer episodio de FA y tener una duración de menos de 12 horas se relacionó con mayores tasas de reversión, 54,7% frente a 35,1% y de 83,6% frente a 59,5%, respectivamente, pero solo la segunda fue significativa con una OR ajustada de 2,76 (IC 95%: 1,12-6,80), p = 0,028. Se notificaron eventos adversos en 30 pacientes. Ninguno de ellos tuvo consecuencias relevantes y solo dos (1,2%) motivaron la suspensión del fármaco. Conclusiones. Vernakalant es un fármaco eficaz y seguro para la restauración del ritmo sinusal en los SUH (AU))

Objectives. To study the effectiveness and safety of vernakalant for restoration of sinus rhythm in patients with atrial fibrillation (AF) in routine hospital emergency department care, and to evaluate factors associated with a more effective response. Methods. Prospective multicenter cohort study enrolling consecutive patients who were administered vernakalant for medical cardioversion of AF between September 2014 through March 2016 in 5 hospitals in the Spanish autonomous community of Valencia. Results. We studied 165 cases. The median (interquartile range) was 68 years (56-77) years. Cardioversion with vernakalant was effective in 77.6% (95% CI, 71.1%-84%). The median time to conversion was 8 ( 6-12) minutes after a first dose and 34 (22-62) minutes after a second dose. A prior history of cardiac insufficiency was nonsignificantly less common in patients who converted with vernakalant (6.3%) than in those who did not (18.9%) (adjusted odds ratio [OR], 0.45 [95% CI, 0.13-1.56]; P=.208). Having no prior history of AF was nonsignificantly related to greater effectiveness (in 54.7% vs in 35.1% with prior AF). Duration less than 12 hours was significantly associated with greater effectiveness (83.6% vs 59.5%; adjusted OR, 2.76 [95% CI, 1.12-6.80]; P=.028). Adverse events were reported for 30 patients. None of the events had clinically important consequences, and in only 2 cases (1.2%) was it necessary to suspend treatment. Conclusion. Vernakalant is effective and safe for restoring sinus rhythm in the hospital emergency department (AU)

Utilidad de vernakalant en la estabilización del ritmo sinusal durante procedimientos de ablación por catéter / The usefulness of vernakalant in maintaining sinus rhythm during ablation procedures

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Respuesta al ECG de junio de 2015 / Response to ECG, June 2015

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Cost of acute stroke care for patients with atrial fibrillation compared with those in sinus rhythm.

BACKGROUND: Atrial fibrillation (AF) is a major risk factor for stroke. Cost-effectiveness studies of anticoagulants for stroke prevention in AF rarely utilise AF-stroke-specific cost data in their analyses, as data are limited. Data that exist do not account for AF found on prolonged cardiac monitoring after stroke, further underestimating the clinical and economic burden of AF-stroke. OBJECTIVE: Our objective was to investigate differences in direct medical costs of acute stroke care among patients with and without AF. METHODS: Data were prospectively collected from 213 consecutive patients with confirmed stroke (196 ischaemic [IS], 17 intracranial haemorrhage [ICH]), admitted to a UK district general hospital between November 2011 and October 2012. Sociodemographic, clinical and cardiac monitoring characteristics were recorded, and resource use was calculated using a 'bottom-up' approach. Univariate and multivariate stepwise regressions were performed to identify predictors of direct cost. RESULTS: Among patients with IS, 73 had AF (37%). These patients were older, experienced greater stroke severity, lengths of hospitalisation, inpatient mortality and discharge to institutionalised care than those without AF. Mean acute care costs for the year 2012 were £6,978 (standard deviation [SD] 6,769, range 510-36,952). Mean (SD) costs were significantly higher for patients with AF than for those without (£9,083 [7,381] vs. £5,729 [6,071], p = <0.001). AF independently predicted acute care cost along with history of heart failure and stroke severity. The adjusted independent effect of having AF on costs was an additional £2,173 (95% confidence interval 91-4,254; p = 0.041). Costs for patients with an ICH did not differ according to cardiac rhythm. CONCLUSION: Direct medical costs of acute stroke care for patients with AF may be 50% greater than for patients without. Economic studies should take this into account to ensure the benefits of anticoagulants are not underestimated.

Interacción entre dronedarona y simvastatina identificada durante el seguimiento farmacoterapéutico en una farmacia comunitaria / Dronedarone interaction with simvastatin identified during a pharmacotherapeutic follow-up of patients in a community pharmacy

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The new antiarrhythmic drug vernakalant: ex vivo study of human atrial tissue from sinus rhythm and chronic atrial fibrillation.

AIMS: Vernakalant is a newly developed antiarrhythmic drug against atrial fibrillation (AF). However, its electrophysiological actions on human myocardium are unknown. METHODS AND RESULTS: Action potentials (APs) and ion currents were recorded in right atrial trabeculae and cardiomyocytes from patients in sinus rhythm (SR) and chronic AF. Vernakalant prolonged early repolarization in SR and AF, but late only in AF. AP amplitude (APA) and dV/dtmax were reduced in a concentration- and frequency-dependent manner with IC50 < 10 µM at >3 Hz. Effective refractory period was increased more than action potential duration (APD) in SR and AF. INa was blocked with IC50s of 95 and 84 µM for SR and AF, respectively (0.5 Hz). Vernakalant did not reduce outward potassium currents compared with time-matched controls. However, area under the current-time curve was reduced due to acceleration of current decline with IC50s of 19 and 12 µM for SR and AF, respectively. Vernakalant had less effect on APD than the IKr blocker E-4031, blocked IK,ACh, and had a small inhibitory effect on IK1 at 30 µM. L-Type Ca(2+) currents (SR) were reduced with IC50 of 84 µM. CONCLUSION: Rate-dependent block of Na(+) channels represents the main antiarrhythmic mechanism of vernakalant in the fibrillating atrium. Open channel block of early transient outward currents and IK,ACh could also contribute.

Flecainida, una opción terapéutica en una paciente con síndrome de QT largo tipo 3 por la mutación V411M en heterocigosis en el gen SCN5A / Flecainide, a therapeutic option in a patient with long QT syndrome type 3 caused by the heterozygous V411M mutation in the SCN5A gene

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Resumption of sinus rhythm from fetal complete atrioventricular block after maternally administered ritodrine.

Reports have indicated that maternal administration of ritodrine increased the ventricular rate and thus ameliorated signs of heart failure in a fetus with complete atrioventricular block (CAVB). A fetus from a mother without the anti-SS-A/SS-B antibody had CAVB, with atrial rate 148-154 bpm and ventricular rate 53-57 bpm. After maternal administration of ritodrine, the ventricular rate increased to 60-65 bpm, and then sinus rhythm resumed. Ritodrine may not only increase the ventricular rate but also induce sinus rhythm in a fetus with CAVB.

"Zone of avoidance": RR interval distribution in tachograms, histograms, and Poincaré plots of a Boxer dog.

The RR intervals of sinus and ventricular beats were determined by analysis of a 24-h ambulatory electrocardiogram in a Boxer before and after treatment with sotalol. These RR intervals were plotted using tachograms, histograms, and Poincaré plots. The tachogram demonstrated a 'band' wherein a range of RR intervals was infrequent, the histogram did not take the form of a single Gaussian distribution of RR intervals, and the Poincaré plot showed nonhomogeneous beat-to-beat variability. This type of patterning was described as a "zone of avoidance" potentially caused by the clustering of beats within specific ranges. Treatment with sotalol enhanced the "zone of avoidance". Further investigation is needed to understand the mechanism for this observation as well as any clinical implications.

Effect of antihypertensive drug therapy on short-term heart rate variability in newly diagnosed essential hypertension.

1. Abnormalities of cardiac autonomic regulation are a potential mechanism for morbidity despite blood pressure (BP) lowering in hypertension. Analysis of short-term (5 min) heart rate variability (HRV) provides a non-invasive probe of autonomic regulation of sino-atrial (SA) node automaticity. 2. We hypothesized that antihypertensive drug therapy would be associated with an increase in 5 min overall HRV, along with a decrease in blood pressure (BP), at 8 weeks follow up in subjects with newly diagnosed, never-treated essential hypertension. 3. One hundred and fifty patients (84 men and 66 women; mean (+/-SD) age 48 +/- 10 years) with newly diagnosed essential hypertension were divided to five groups of 30 patients each to receive one of the following antihypertensive drugs (or drug combinations): 5 mg/day amlodipine; 50 mg/day atenolol; 5 mg/day enalapril; 25 mg/day hydrochlorothiazide; or a combination of 5 mg/day amlodipine and 50 mg/day atenolol. 4. The only significant change in HRV indices was an increase in total variability of RR intervals and an increase in high-frequency (HF) RR interval spectral power in the amlodipine + atenolol-treated group (P < 0.05). 5. The results indicate that there is a dissociation between changes in short-term HRV and mean RR interval and BP lowering in patients with newly diagnosed hypertension. 6. We interpret the increase in HF RR interval spectral power in the amlodipine + atenolol-treated group as being due to an increase in vagal modulation of RR intervals and/or diminution in sympathetic restraint of respiratory sinus arrhythmia.