Cardiovascular changes during deep halothane anaesthesia in infants and children

Area of Science:

• Anesthesiology
• Pediatric Cardiology

Background:

• Halothane is a common anesthetic agent used in pediatric surgery.
• Understanding its hemodynamic effects in infants and children is crucial for patient safety.

Purpose of the Study:

• To evaluate the effects of halothane anesthesia induction and intubation on cardiovascular function in infants and children.
• To compare these effects in unpremedicated infants versus diazepam-atropine premedicated children.

Main Methods:

• Noninvasive measurements of cardiac output, blood pressure, and heart rate.
• Pulsed Doppler echocardiography for cardiac output; M-mode echocardiography for left ventricular shortening fraction.
• Studies conducted before, during, and after anesthesia induction and intubation.

Main Results:

• Halothane induction in infants caused significant decreases in blood pressure, cardiac index, stroke volume index, and left ventricular shortening fraction.
• In premedicated children, halothane induction increased heart rate but decreased blood pressure, stroke volume index, and left ventricular shortening fraction.
• Intubation further affected hemodynamics, with varying responses in infants and children regarding heart rate, blood pressure, and cardiac output.

Conclusions:

• Healthy infants and children tolerate halothane anesthesia induction for intubation.
• Significant reductions in cardiac output and myocardial contractility are expected, leading to potential blood pressure decreases.
• Close cardiovascular monitoring is essential during pediatric anesthesia with halothane.