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Traumatic Brain Injury l: Introduction01:28

Traumatic Brain Injury l: Introduction

DefinitionTraumatic brain injury, or TBI, is a disturbance of normal brain function induced by an external mechanical force, such as a direct blow to the head or a penetrating injury. It can affect both brain structure and function, producing a wide range of clinical outcomes. TBI is a heterogeneous condition, meaning its effects may differ based on the type, location, and severity of the injury.Basis of ClassificationTBI is classified based on severity, injury mechanism, or pathophysiology. In...

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QTc prolongation after brain surgery.

Federico J Capparelli1, Mauricio Abello, L Patricio Maskin

  • 1Intensive Care Unit, Internal Medicine Department, Raul Carrea Institute for Neurological Research FLENI, Buenos Aires C1428AQK, Argentina.

Neurological Research
|March 5, 2013
PubMed
Summary
This summary is machine-generated.

Prolonged heart rate-corrected QT interval (QTc) is common after brain surgery, affecting 71% of patients. This QTc prolongation is not explained by common factors like low potassium, suggesting brain injury may be a primary cause.

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Area of Science:

  • Cardiology
  • Neurosurgery
  • Intensive Care Medicine

Background:

  • Electrocardiogram (ECG) abnormalities, including QT interval prolongation, are reported after acute central nervous system (CNS) events.
  • The incidence and causes of QTc prolongation specifically after brain surgery require further investigation.

Purpose of the Study:

  • To determine the frequency of heart rate-corrected QT interval (QTc) prolongation in patients admitted to the intensive care unit (ICU) following brain surgery.
  • To identify potential contributing factors to QTc prolongation in this patient population.

Main Methods:

  • Analysis of admission 12-lead ECGs from 114 patients who underwent brain surgery.
  • QTc interval calculated using Bazett's formula; prolonged QTc defined as ≥450 ms.
  • Comparison of patient demographics, laboratory values (serum glucose, electrolytes, creatinine, magnesium, calcium, sodium, pH), and medication use between groups with normal and prolonged QTc.

Main Results:

  • A high incidence of QTc prolongation was observed in 71% of patients.
  • The mean QTc was 470±42 ms, with 52% having QTc between 450-500 ms and 19% having QTc >500 ms.
  • Higher heart rate and serum glucose levels were noted in the prolonged QTc group. Hypokalemia, hypocalcemia, and use of phenytoin or metoclopramide did not significantly correlate with QTc prolongation.

Conclusions:

  • Prolonged QTc is a frequent finding in patients after brain surgery.
  • Commonly cited causes such as hypokalemia, hypocalcemia, and specific medications do not appear to explain the high incidence.
  • Intraoperative brain injury is suggested as a potential primary cause of QTc prolongation post-neurosurgery.