Labatt Family Heart Center

Heart, Canada

Labatt Family Heart Center

Heart, Canada
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Hahn E.,The Heart Institute | Szwast A.,Children's Hospital of Philadelphia | Cnota J.,The Heart Institute | Fifer C.G.,The Congenital Heart Center At Cs Mott Childrens Hospital Ann Arbor Mi United States | And 3 more authors.
Ultrasound in Obstetrics and Gynecology | Year: 2016

Objective: To investigate the association of fetal growth and cerebrovascular resistance at different periods in gestation with neurodevelopment (ND) at 14 months in the univentricular subject. Methods: We reviewed serial prenatal ultrasound (US) examinations from 133 infants enrolled in the Pediatric Heart Network's Single Ventricle Reconstruction or Infants with Single Ventricle trials, including a subset of 82 infants in whom ND was assessed at 14 months using mental (MDI) and psychomotor (PDI) developmental indices. US examinations were assigned to one of four gestational time periods: (1) 20-23 weeks, (2) 24-29 weeks, (3) 30-33 weeks and (4) ≥ 34 weeks. Middle cerebral artery (MCA) flow velocity was measured and pulsatility index (PI), a measure of downstream resistance, was calculated. Data on fetal head circumference (HC), femur length, abdominal circumference (AC) and estimated fetal weight (EFW) were collected and their Z-scores were calculated. We evaluated the rate of change of these parameters over time within individuals, tested correlations between fetal growth and ND and assessed predictors of ND using linear regression. Results: The mean prenatal HC Z-score was < 0 at each gestational-age period and became more negative later in pregnancy. There was less growth in HC from time period 3 to period 4 compared with from period 2 to 3 (Δ HC Z-score, -0.07 ± 0.1 vs 0.11 ± 0.22, P = 0.03). Though ND did not correlate with HC, HC Z-score or MCA-PI Z-score, HC growth from period 2 to period 3 correlated with MDI (r = 0.45, P = 0.047). AC Z-score in period 4 predicted MDI (β = 4.02, P = 0.04). EFW Z-score and AC Z-score in period 2 predicted PDI (β = 10.6, P = 0.04 and β = 3.29, P = 0.047, respectively). Lower MCA-PI at initial US predicted higher PDI (β = -14.7, P = 0.03). Conclusion: In univentricular fetuses, lower cerebrovascular resistance may be protective for ND. Decreased fetal somatic growth may predict developmental abnormalities. © 2016 ISUOG. Published by John Wiley & Sons Ltd.


Walpole B.,University of Guelph | Walpole B.,Hospital for Sick Children | Dettmer E.,Hospital for Sick Children | Morrongiello B.A.,University of Guelph | And 5 more authors.
Journal of Pediatric Psychology | Year: 2013

Objective To evaluate the efficacy of Motivational Interviewing (MI) as an intervention for promoting self-efficacy and weight loss in a sample of overweight and obese youth. Methods/Design 40 participants (aged 10-18 years) were randomly assigned to control (social skills training) or treatment (MI) group. Both groups received individual therapy (∼30 min/month) in addition to usual care of diet/exercise counseling. Pre-and post-(at 6 months follow-up) variables included measures of self-efficacy and anthropometrics. Results Although significant between-group differences were not found, individuals in the MI group attended more sessions. Overall, participants in both groups showed significant increases in self-efficacy and a trend of decreased body mass index z-scores. Conclusions Health benefits from participation in individual therapy may have been accrued; however, specific benefits attributable to MI were limited. Findings suggest that more than one type of counseling intervention (i.e., MI and social skills training) may be beneficial when providing integrative treatment for obese youth. © 2013 Author 2013.


Koopman L.P.,Labatt Family Heart Center | Koopman L.P.,Erasmus Medical Center | McCrindle B.W.,Labatt Family Heart Center | Slorach C.,Labatt Family Heart Center | And 11 more authors.
Journal of the American Society of Echocardiography | Year: 2012

Background: Changes in vascular and myocardial structure and function have been demonstrated in obese children, but limited data are available on how these changes are related. The aims of this study were to investigate vascular and myocardial changes in obese children with lipid abnormalities and to study the interactions between vascular and myocardial parameters. Methods: A cross-sectional, prospective observational study was conducted. Twenty-one obese and 27 normal-weight controls aged 14 ± 2 years participated. Cardiac assessment included geometric parameters and myocardial deformation (strain and strain rate) analysis by color tissue Doppler and speckle-tracking echocardiography. Vascular assessment included carotid intima-media thickness, flow-mediated dilatation, pulse-wave velocity, and other stiffness measures of the aorta and carotid artery, as well as noninvasive estimation of arterial elastance and left ventricular (LV) end-systolic elastance. Results: Obese children compared with controls had lower color tissue Doppler-derived LV systolic radial strain values (45 ± 11% vs 56 ± 12%, P =.002), lower speckle-tracking echocardiography-derived LV systolic longitudinal strain values (-18 ± 2% vs -21 ± 2%, P <.001), and lower speckle-tracking echocardiography-derived LV early diastolic strain rate values (1.7 ± 0.3 vs 2.5 ± 0.4, P <.001). Carotid intima-media thickness was increased, pulse-wave velocity was faster, and arterial distension coefficients were lower in obese children. The ratio of arterial elastance to LV end-systolic elastance (a marker of ventricular-arterial coupling) was lower in obese children than controls (0.73 ± 0.32 vs 0.47 ± 0.15, P =.003). Changes in vascular parameters were correlated with changes in longitudinal myocardial deformation parameters. Conclusions: Obese children with lipid abnormalities have reduced systolic and diastolic LV deformation characteristics, early vessel wall changes, and increased arterial stiffness. Abnormal ventricular-vascular interaction is suggested by these data and warrants further investigation. © 2012 by the American Society of Echocardiography.


Sarkola T.,Labatt Family Heart Center | Sarkola T.,University of Helsinki | Manlhiot C.,Labatt Family Heart Center | Slorach C.,Labatt Family Heart Center | And 7 more authors.
Arteriosclerosis, Thrombosis, and Vascular Biology | Year: 2012

OBJECTIVE-: To develop a normative data set and to study the relationship among arterial structure, different anthropometric measures, blood pressure, and arterial function during healthy childhood using very-high-resolution ultrasound (25-55 MHz). METHODS AND RESULTS-: In 135 healthy children between 0 and 18 years of age, we assessed the structure of the carotid arteries, larger peripheral arteries, aorta, and left ventricle with ultrasound. Arterial stiffness was assessed by pulse wave velocity and endothelial function by brachial flow-mediated dilation. Reference curves adjusted for age and body surface area of arterial lumen diameters, intima-media thickness, and adventitia thickness were developed. Arterial walls thicken during childhood predominantly as a result of a progressive increase in intima-media thickness. There were significant associations among lumen diameter (R range, 0.20-0.88 for different arteries; P<0.001), intima-media thickness (R range, 0.47-0.85; P<0.001), left ventricular mass (R=0.90; P<0.001), and adventitia thickness (R range, 0.15-0.22; P<0.001) with sex, age, body surface, and systolic blood pressure. Arterial wall stress was associated with lumen diameter (R range, 0.52-0.83; P<0.001) and intima-media thickness (R range, 0.53-0.88; P<0.001). Limited relationships were found among arterial wall layer thickness, stiffness, and endothelial function. CONCLUSION-: In healthy children, the evolution of the arterial structure is mainly related to anthropometrics and blood pressure. © 2012 American Heart Association, Inc.


Walsh M.A.,Labatt Family Heart Center | Walsh M.A.,University of Toronto | Merat M.,University of Toronto | La Rotta G.,Labatt Family Heart Center | And 10 more authors.
Critical Care Medicine | Year: 2011

Objective: We hypothesized that spontaneous inspiratory effort transmitted to the pleural space during airway pressure release ventilation would result in increased lung perfusion after surgery for tetralogy of Fallot or following a cavopulmonary shunt as a consequence of transient decreases in intrapleural pressure. Design: Prospective crossover cohort study. Setting: A tertiary care cardiac pediatric intensive care unit. Patients: Children after tetralogy of Fallot repair, cavopulmonary shunt, or Fontan operation. Interventions: Lung perfusion and cardiac output were measured during airway pressure release ventilation and pressure control ventilation with pressure support, both with and without spontaneous ventilation. Oxygen consumption was measured (mass spectrometer) and lung perfusion/cardiac output calculated (Fick equation). Constant levels of CO 2 and mean airway pressure were targeted in all study phases. Measurements and Main Results: Twenty patients were enrolled in the study, nine after repair of tetralogy of Fallot and 11 after a cavopulmonary shunt. In the absence of spontaneous ventilation, there were no differences in lung perfusion or any of the measured gas exchange or hemodynamic parameters. In the presence of spontaneous ventilation for all patients, mean pulmonary blood flow increased from 2.4 to 2.9 L•min -1M -1 (p = .02). Oxygen delivery increased from 594 to 774 mL/min/m (p = .05) in the patients with tetralogy of Fallot patients and from 473 to 518 L•min -1M -2 (p = .07) in the cavopulmonary shunt group. Conclusion: Ventilation with airway pressure release ventilation (at comparable mean airway pressure) improves lung perfusion compared with pressure control ventilation in children after tetralogy of Fallot repair and cavopulmonary shunt operations. Although this study focused on tetralogy of Fallot and cavopulmonary shunt operations, the improved cardiopulmonary interactions may be beneficial in other situations in which hemodynamics are impaired by positive pressure ventilation. © 2011 by the Society of Critical Care Medicine and Lippincott Williams & Wilkins.


Lynch J.,Our Ladys Childrens Hospital | Pehora C.,University of Toronto | Holtby H.,University of Toronto | Holtby H.,Labatt Family Heart Center | And 4 more authors.
Paediatric Anaesthesia | Year: 2011

Introduction: It is thought that patients with cardiomyopathy have an increased risk of cardiac arrest on induction of anesthesia, but there is little available data. The purpose of this study was to identify the incidence and potential risk factors for cardiac arrest upon induction of anesthesia in children with cardiomyopathy in our institution. Methods: A retrospective chart review was performed. Eligible patients included patients admitted between 1998 and 2008 with the International Statistical Classification of Disease code for cardiomyopathy (ICD-9 code 425) who underwent airway intervention for sedation or general anesthesia in the operating room, cardiac diagnostic and interventional unit (CDIU) or intensive care unit. Patients undergoing emergency airway intervention following cardiovascular collapse were excluded. For each patient, we recorded patient demographics, disease severity, anesthesia location, and anesthetic technique. Results: One hundred and twenty-nine patients with cardiomyopathy underwent a total of 236 anesthetic events, and four cardiac arrests were identified. One was related to bradycardia (HR < 60), two were attributed to bradycardia in association with severe hypotension (systolic blood pressure < 45), and the fourth arrest was related to isolated severe hypotension. Two occurred in the operating suite and two in the CDIU. There was no resulting mortality. One patient progressed to heart transplantation. Multiple combinations of anesthetic drugs were used for induction of anesthesia. Conclusion: We performed a review of the last 10 years of anesthesia events in children with cardiomyopathy. We report four cardiac arrests in two patients and 236 anesthetic events (1.7%). To the best of our knowledge, this is the largest review of these patients to date but is limited by its retrospective nature. The low cardiac arrest incidence prevents the identification of risk factors and the development of a cardiac arrest risk predictive clinical tool. © 2011 Blackwell Publishing Ltd.


Taylor K.,University of Toronto | Taylor K.,Labatt Family Heart Center | La Rotta G.,University of Toronto | La Rotta G.,Labatt Family Heart Center | And 7 more authors.
Journal of Cardiothoracic and Vascular Anesthesia | Year: 2011

Objective(s): To evaluate the measurement of cardiac output (CO) using continuous electrical bioimpedance cardiography (Physioflow; Neumedx, Philadelphia, PA) (CO PF) with a simultaneous direct Fick measurement (CO FICK) in children with congenital heart disease. Design: A prospective cohort study comparing 2 methods of measurement of CO. Setting: A quaternary university-affiliated pediatric hospital. Participants: Children undergoing cardiac catheterization for clinical care. Interventions: The Physioflow measured continuous real time CO in 15-second epochs and simultaneous measurement of cardiac output by direct Fick (with mass spectrometry to assess VO 2) were acquired. Measurements and Main Results: Sixty-five patients were recruited, and data from 56 (25 males) were adequate for analysis. The median age at study was 3.5 years (range, 0.4-16.6 years), and the median body surface area was 0.62 m 2 (range, 0.31-1.71). There were 25 of 56 (45%) with univentricular physiology. A total of 19,228 Physioflow data points were available for the analysis of which 14,569 (76%) were valid; 96% of the invalid measurements were identified as artifacts by the device. The average cardiac index of valid measurements was 3.09 ± 0.72 L/min/m 2. Compared with the Fick CO, the mean bias was -0.09 L/min, but the 95% limits of agreement were -3.20 to +3.01 L/min/m 2. Consequently, only 20 of 56 (36%) of measurements were within 20%, and 31 of 56 (55%) of measurements were within 30% of each other. Conclusions: Compared with measurements made by direct Fick, CO measured using the Physioflow device was unreliable in anesthetized children with congenital heart disease. © 2011 Elsevier Inc.


Manlhiot C.,Labatt Family Heart Center | Menjak I.B.,Labatt Family Heart Center | Brandao L.R.,University of Toronto | Gruenwald C.E.,Labatt Family Heart Center | And 13 more authors.
Circulation | Year: 2011

Background-: Thrombosis, usually considered a serious but rare complication of pediatric cardiac surgery, has not been a major clinical and/or research focus in the past. Methods and Results-: We noted 444 thrombi (66% occlusive, 60% symptomatic) in 171 of 1542 surgeries (11%). Factors associated with increased odds of thrombosis were age <31 days (odds ratio [OR], 2.0; P=0.002), baseline oxygen saturation <85% (OR, 2.0; P=0.001), previous thrombosis (OR, 2.6; P=0.001), heart transplantation (OR, 4.1; P<0.001), use of deep hypothermic circulatory arrest (OR, 1.9 P=0.01), longer cumulative time with central lines (OR, 1.2 per 5-day equivalent; P<0.001), and postoperative use of extracorporeal support (OR, 5.2; P<0.001). Serious complications of thrombosis occurred with 64 of 444 thrombi (14%) in 47 of 171 patients (28%), and were associated with thrombus location (intrathoracic, 45%; extrathoracic arterial, 19%; extrathoracic venous, 8%; P<0.001), symptomatic thrombi (OR, 8.0; P=0.02), and partially/fully occluding thrombi (OR, 14.3; P=0.001); indwelling access line in vessel (versus no access line) was associated with lower risk of serious complications (OR, 0.4; P=0.05). Thrombosis was associated with longer intensive care unit (+10.0 days; P<0.001) and hospital stay (+15.2 days; P<0.001); higher odds of cardiac arrest (OR, 4.9; P<0.001), catheter reintervention (OR, 3.3; P=0.002), and reoperation (OR, 2.5; P=0.003); and increased mortality (OR, 5.1; P<0.001). Long-term outcome assessment was possible for 316 thrombi in 129 patients. Of those, 197 (62%) had resolved at the last follow-up. Factors associated with increased odds of thrombus resolution were location (intrathoracic, 75%; extrathoracic arterial, 89%; extrathoracic venous, 60%; P<0.001), nonocclusive thrombi (OR, 2.2; P=0.01), older age at surgery (OR, 1.2 per year; P=0.04), higher white blood cell count (OR, 1.1/10 cells per 1 mL; P=0.002), and lower fibrinogen (OR, 1.4/g/L; P=0.02) after surgery. Conclusions-: Thrombosis affects a high proportion of children undergoing cardiac surgery and is associated with suboptimal outcomes. Increased awareness and effective prevention and detection strategies are needed. © 2011 American Heart Association. All rights reserved.


Dragulescu A.,Labatt Family Heart Center | Golding F.,Labatt Family Heart Center | Van Arsdell G.,Labatt Family Heart Center | Caldarone C.,Labatt Family Heart Center | And 4 more authors.
Journal of Thoracic and Cardiovascular Surgery | Year: 2012

Objective: Transesophageal echocardiography is the primary intraoperative imaging modality used to evaluate cardiac surgery. Its predecessor, epicardial echocardiography, enables visualization of certain cardiovascular structures that are beyond the visual scope of transesophageal echocardiography. We review the current use of epicardial echocardiography to analyze its contemporary application and benefit. Methods: A retrospective review of the intraoperative echocardiograms of 1204 children undergoing bypass cardiovascular surgery between January 2007 and December 2009 was performed. The incidence of epicardial echocardiography use, intraoperative revisions, and early reinterventions were analyzed. Results: Epicardial echocardiography was performed in 7.9% of all intraoperative studies: epicardial echocardiography alone (n = 38) and transesophageal echocardiography + epicardial echocardiography (n = 57). Epicardial echocardiography alone was performed in patients with contraindications for transesophageal echocardiography. In the transesophageal echocardiography + epicardial echocardiography group, indications to obtain additional information by epicardial echocardiography were for the assessment of branch pulmonary arteries (40%), coronary arteries (28%), aortic arch/Blalock-Taussig shunt (14%), Glenn/Fontan circuit (9%), pulmonary veins/baffles (7%), and residual ventricular septal defects (1.7%). The overall intraoperative surgical revision incidence was 10.2%, consisting of 21% of the transesophageal echocardiography + epicardial echocardiography group, 5.3% of the epicardial echocardiography alone group (P = .01), and 9.8% of transesophageal echocardiography alone group (P = .02). Intraoperative revisions indicated after epicardial echocardiography were mostly related to extracardiac structures (77%), whereas they were mostly related to intracardiac structures in the transesophageal echocardiography alone group (80.7%) (P = .0002). Early reintervention was indicated mostly for pulmonary artery and Glenn obstructions, the majority (75%) with previously known stenosis or interventions on the pulmonary arteries. Conclusions: Epicardial echocardiography detects residual intraoperative lesions not visualized by transesophageal echocardiography, most frequently related to pulmonary arteries. Its use, in addition to standard transesophageal echocardiography, may decrease the need for early reintervention. © 2012 by The American Association for Thoracic Surgery.

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