Noninvasive localization of accessory pathways in patients with Wolff-Parkinson-White syndrome: a strain imaging study

Noninvasive techniques for the localization of the accessory pathways [APs] might help guide mapping procedures and ablation techniques. We sought to examine the diagnostic accuracy of strain imaging for the localization of the APs in Wolff-Parkinson-White syndrome. We prospectively studied 25 patients [mean age = 32 +/- 17 years, 58.3% men] with evidence of pre-excitation on electrocardiography [ECG]. Electromechanical interval was defined as the time difference between the onset of delta wave and the onset of regional myocardial contraction. Time differences between the onset of delta wave [delta] and the onset of regional myocardial contraction [delta-So], peak systolic motion [delta-Sm], regional strain [delta-epsilon], peak strain [delta-epsilonp], and peak strain rate [delta-SRp] were measured. There was a significant difference between time to onset of delta wave to onset of peak systolic motion [mean +/- SD] in the AP location [A] and normal segments [B] versus that in the normal volunteers [C] [A: [57.08 +/- 23.88 msec] vs. B: [75.20 +/- 14.75] vs. C: [72.9 0 +/- 11.16]; p value [A vs. B] = 0.004 and p value [A vs. C] = 0.18] and [A: [49.17 +/- 35.79] vs. B: [67.60 +/- 14.51] vs. C: [67.40 +/- 6.06 msec]; p value [A vs. B] < 0.001 and p value [A vs. C] = 0.12, respectively]. Our study showed that strain imaging parameters [[delta-So] and [delta-Strain]] are superior to the ECG in the localization of the APs [84% vs. 76%]

[ evaluation of late outcome of balloon pulmonary valvuloplasty in children]

Isolated pulmonary valve stenosis represents 8-10% of congenital cardiac anomalies. This study was performed to evaluate the late outcomes of Balloon Pulmonary Valvuloplasty [BPV] in children with residual infundibular stenosis. Seventy-eight patients underwent BPV in Rajaee Heart Center in Tehran Iran, from 2008-2010. The patients were divided into two groups: with and without infundibular stenosis. The group with infundibular stenosis was subdivided into two groups: with and without propranolol administration. Gradient measurement follow-ups by Doppler echocardiography were done on the first day and 1, 3, 6 and 12 months afterwards. Thirty five [44.9%] patients were male and 43 [55.1%] were female. The mean age of participants was 4.29 +/- 3.5 years and the mean weight 16.18 +/- 8.8 kg 33 patients [43%] did not show residual infundibular stenosis but 45 [57%] did so in the evaluations. There were no significant differences between the two groups regarding age, weight, sex, kind of balloon valvuplasty, balloon to body surface area ratio and pulmonary regurgitation [PR]. Propranolol was administered to 27 [60%] patients with residual stenosis for six months but 18 [40%] did not receive the medication. In both groups, the gradient significantly decreased immediately after BPV [P<0.0001]. In the propranolol group a constant decrease in residual gradient was seen. There was a significant relationship between balloon to body surface area ratio [387 +/- 94mm2/m[2]] with moderate to severe PR [P<0.015]. BPV is a safe and effective procedure to treat PS. Residual infundibular gradient after BPV decreases over time and propranolol helps decrease the gradient

Validity of sildenafil test in patients with pulmonary arterial hypertension associated with congenital heart disease according to clinical and ecardiographic parameters

Pulmonary arterial hypertension is a complication of most congenital heart diseases. We sought to assess the effect of sildenafil on patients suffering from pulmonary arterial hypertension in association with congenital heart disease on the basis of clinical and echocardiographic parameters and compare the catheterization and treatment results so as to evaluate the predictive value of sildenafil on the operability of patients.After primary echocardiography, 21 patients were selected for the final study with a diagnosis of moderate-to-large ventricular septal defect and pulmonary artery hypertension. They were divided into 3 age groups: younger than one year, 1 to 2 years, and older than 2 years. Before and one hour after the consumption of sildenafil, the patients had their oxygen saturation and blood pressure measured. Additionally, the patients underwent echocardiography and cardiac catheterization. The patients' operability was determined on the basis of their clinical condition and their response to oxygen inhalation in the catheterization room. Finally, the results of the drug response and final treatment were analyzed statistically. The 21 patients, who had ventricular septal defect and pulmonary arterial hypertension, were comprised of 8 [38%] boys and 13 [62%] girls. The patients aged from 2.5 to 204 months [mean 30 months]. It was clear that the younger patients had a more positive response to the drug. All the patients who had a positive response to the drug were considered operable after catheterization and all of them had a positive response to treatment. There was no significant correlation between operable/inoperable conditions and response to treatment [P value=0.262], while there was a very significant correlation between response to treatment and response to drug [P value=0.005]. According to the results of this study and given the low cost and availability of sildenafil and its oral consumability on the one hand and the availability and non-invasiveness of echocardiography on the other, it seems that sildenafil is useful in determining the pulmonary vascular bed reactivity via echocardiographic parameters and facilitating the decision-making process for surgery in patients with pulmonary arterial hypertension and congenital heart diseases

Correlation of post-operative hypoalbuminemia with outcome of pediatric cardiac surgery

Hypoalbuminemia may be caused by liver disease, nephrotic syndrome, burns, protein-losing entropathy, malnutrition, and metabolic stress. Alterations in albumin in metabolic stress such as cardiac surgery have been previously investigated. We studied serum albumin concentration in children with congenital heart disease and also the association of hypoalbuminemia with mortality and morbidity after pediatric cardiac surgery. We measured serum albumin concentration prospectively in 300 children with congenital heart disease who underwent surgery between July and September 2008 in Shaheed Rajaee hospital. Serum albumin concentration was measured before and 48 hours after cardiac surgery and was subsequently compared between 2 groups: cyanotic and acyanotic and also with normal values. Serum albumin concentration decreased on the second post-operative day in 70 [23.3%] patients. There was a positive correlation between the post-surgical hypoalbuminemia and cyanotic heart disease. The cyanotic children had lower serum albumin concentration Thant the acyanotic ones [P value < 0.001]. There was a significant association between post-operative serum albumin concentration and acute renal failure [P value < 0.001] and death [P value < 0.001]. Drop in serum albumin concentration was more prominent in the males than in the females [P value= 0.038] and in the cyanotic patients than in the acyanotic ones [P value < 0.001] as well as in those with acute renal failure [P value < 0.001], pericardial effusion [P value= 0.050], seizure [P value < 0.001], and death [P value < 0.001]. Hypoalbuminemia was not associated with longer hospital [P value = 0.142] or intensive care unit stay [P value = 0.199]. Post-operative serum albumin concentration was lower in the cyanotic children and male patients in our study. In addition, the post-operative decrease in albumin was associated with an increased risk of pericardial effusion, renal failure, seizure, and death.