Observational studyAnnals of cardiac anaesthesia2026
A Comparative Study to Evaluate the Pre and Post-Operative Electrocardiographic and Echocardiographic Changes in Children with Tetralogy of Fallot Undergoing Modified Blalock-Taussig-Thomas Shunt Surgery.
Observational study in Annals of cardiac anaesthesia, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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5 authors.
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Abstract
backgroundThe modified Blalock-Taussig-Thomas shunt (mBTTS) is a palliative surgical procedure for tetralogy of Fallot (TOF). It enhances left heart filling, which may cause alterations observable in electrocardiography (ECG) and trans thoracic echocardiography (TTE).
aimThis study aims to assess if the ECG and TTE changes in TOF children undergoing mBTT shunt surgery reflect the improved pulmonary blood flow.
settingTertiary care hospital.
designA prospective observational study. MATERIAL AND
methodThirty-five (35) children diagnosed with TOF, who underwent mBTTS surgery, were included in this study. Pre-operative assessments included a 12-lead ECG and TTE, which were repeated 6 h postoperatively. Hemodynamic and arterial blood gas parameters were also recorded. Statistical analysis was done using a paired t-test.
resultsIn ECG, pre-operative P axis and QRS axis were found to be 62.05 ± 20.82 and 139.88 ± 22.52, respectively, and they were reduced to 54.94 ± 18.91 (P value of 0.007) and 107.68 ± 27.18 (P value < 0.001) postoperatively. Other parameters, including P wave duration, P wave amplitude in augmented vector lead (aVL), Morris and Marcuz index, were significantly increased in the post-operative ECG. Pre-operative left atrial (LA) reservoir volume and left ventricular end-diastolic volume (LV-EDV) were found to be 5.42 ± 1.28 mL and 10.54 ± 1.78 mL, respectively, and they were increased to 10.44 ± 2.73 (P value ≤ 0.001) and 11.40 ± 1.73 (P value ≤ 0.001) postoperatively.
conclusionsChanges observed in the hemodynamics, blood gas parameters, ECG, and TTE are consistent with improved pulmonary blood flow.
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