Publications by authors named "Emmett Dean Mckenzie"

4 Publications

  • Page 1 of 1

Norwood procedure: How I do it.

JTCVS Tech 2020 Dec 13;4:205-207. Epub 2020 Aug 13.

Division of Congenital Heart Surgery, Texas Children's Hospital, Houston, Tex.

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December 2020

The intraoperative use of recombinant activated factor VII in arterial switch operations.

Cardiol Young 2021 Mar 19;31(3):386-390. Epub 2020 Nov 19.

Texas Children's Hospital, Houston, TX, USA.

Background: The rate of bleeding complications following arterial switch operation is too low to independently justify a prospective randomised study for benefit from recombinant factor VIIa. We aimed to evaluate factor VIIa in a pilot study.

Methods: We performed a retrospective cohort study of patients undergoing arterial switch operation from 2012 to 2017. Nearest-neighbour propensity score matching on age, gender, weight, and associated cardiac defects was used to match 27 controls not receiving recombinant factor VIIa to 30 patients receiving recombinant factor VIIa. Fisher's exact test was performed to compare categorical variables. Wilcoxon's rank-sum test was used to compare continuous variables between cohorts.

Results: Post-operative thrombotic complications were not associated with factor VIIa administration (Odds Ratio (OR) 0.28, 95% CI 0.005-3.77, p = 0.336), nor was factor VIIa administration associated with any re-explorations for bleeding. No intraoperative transfusion volumes were different between the recombinant factor VIIa cohort and controls. Post-operative prothrombin time (10.8 [10.3-12.3] versus 15.9 [15.1-17.2], p < 0.001) and international normalised ratio (0.8 [0.73-0.90] versus 1.3 [1.2-1.4], p < 0.001]) were lower in recombinant factor VIIa cohort relative to controls.

Conclusions: In spite of a higher post-bypass packed red blood cell transfusion requirement, patients receiving recombinant factor VIIa had a similar incidence of bleeding post-operatively. With no difference in thrombotic complications, and with improved post-operative laboratory haemostasis, a prospective randomised study is warranted to evaluate recombinant factor VIIa.
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March 2021

Reoperation after isolated subaortic membrane resection.

Cardiol Young 2019 Nov 26;29(11):1391-1396. Epub 2019 Sep 26.

Division of Congenital Heart Surgery, Baylor College of Medicine, Texas Children's Hospital, Houston, TX, USA.

Background: The resection of a subaortic membrane remains far from a curative operation. We sought to examine factors associated with reoperation and the degree of aortic valve regurgitation as a potential long-term source for reoperation.

Methods: All patients who underwent resection of an isolated subaortic membrane between 1995 and 2018 were included. Patients who underwent other procedures were excluded. Paired categorical data were compared using McNemar's test. Univariate time-to-event analyses were performed using Kaplan-Meier methods with log-rank tests for categorical variables and univariate Cox models for continuous variables.

Results: A total of 84 patients (median age 6.6, 31% females) underwent resection of isolated subaortic membrane. At a median follow-up of 9.3 years (interquartile range 0.6-22.5), 12 (14%) patients required one reoperation and 1 patient required two reoperations. Median time to first reoperation was 4.6 years. The degree of aortic valve regurgitation improved post-operatively from pre-operatively (p = 0.0007); however, the degree of aortic valve regurgitation worsened over the course of follow-up (p = 0.010) to equivalence with pre-operative aortic valve regurgitation (p = 0.18). Performance of a septal myectomy was associated with longer freedom from reoperation (p = 0.004).

Conclusions: In patients with isolated subaortic membranes, performance of a septal myectomy can minimise risk for reoperation. Patients should be serially monitored for degradation of the aortic valve, even if aortic regurgitation is not present post-operatively.
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November 2019

Fetal and postnatal echocardiographic imaging of transposition of the great arteries with the aortic valve posterior to the pulmonary valve.

Echocardiography 2019 May 23;36(5):1005-1008. Epub 2019 Feb 23.

Section of Pediatric Cardiology, Department of Pediatrics, Texas Children's Hospital and Baylor College of Medicine, Houston, Texas.

Transposition of the great arteries (TGA) with a posterior aorta is an uncommon but historically important variant of TGA. In this arrangement, the aorta is posterior to the pulmonary valve, maintains fibrous continuity with the mitral valve, and arises from the right ventricle. We present a case of fetal echocardiography demonstrating TGA with a posterior aorta. Postnatal transthoracic echocardiography and intra-operative assessment confirm the anatomy. To the best of our knowledge, this is the first published case of this anatomic lesion by fetal echocardiography.
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May 2019