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Pupillary Response as Assessment of Effective Seizure Induction by Electroconvulsive Therapy
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Hypocapnia and hyperoxia induction using a hyperventilation protocol in electroconvulsive therapy.

Aida de Arriba-Arnau1, Antonia Dalmau2, Neus Salvat-Pujol1

  • 1Grupo de Neurociencias del Institut d'Investigació Biomèdica de Bellvitge (IDIBELL), Unidad Clínica y de Investigación de Trastornos Afectivos, Servicio de Psiquiatría, Hospital Universitari de Bellvitge-Institut Català de la Salut (ICS), L'Hospitalet de Llobregat, Barcelona, España.

Revista De Psiquiatria Y Salud Mental
|June 18, 2016
PubMed
Summary

Protocolized hyperventilation (pHV) using capnography significantly improves oxygenation and reduces carbon dioxide during electroconvulsive therapy. This method lengthens seizures without negatively impacting electroencephalogram quality, offering a cost-effective procedural enhancement.

Keywords:
CapnografíaCapnographyConvulsionesElectroconvulsive therapyHiperventilaciónHipocapniaHyperventilationHypocapniaSeizuresTerapia electroconvulsiva

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Area of Science:

  • Neurology
  • Anesthesiology
  • Critical Care Medicine

Background:

  • Hyperventilation during electroconvulsive therapy (ECT) impacts seizure threshold and characteristics.
  • Optimal hyperventilation techniques in ECT remain undefined.
  • Current practices lack standardized protocols for hyperventilation in ECT.

Purpose of the Study:

  • To evaluate the effects of protocolized hyperventilation (pHV) on ventilation parameters and seizure characteristics in ECT.
  • To assess the feasibility and impact of using capnography during ECT hyperventilation.
  • To determine if pHV improves ECT efficacy and safety.

Main Methods:

  • Prospective evaluation of 130 ECT sessions (65 standard practice, 65 pHV).
  • pHV involved systematic hyperventilation maneuvers using a facial mask and capnography.
  • Ventilation parameters (CO2, O2 saturation) and seizure characteristics were monitored.

Main Results:

  • pHV significantly reduced exhaled CO2 and increased O2 saturation (P<.001).
  • pHV resulted in a mean CO2 reduction of 6.52±4.75 mmHg.
  • Motor and electroencephalographic seizure durations were modestly lengthened in pHV sessions (3.86±14.62s and 4.73±13.95s, respectively) without affecting EEG quality.

Conclusions:

  • Protocolized hyperventilation (pHV) effectively modifies ventilation parameters, inducing hypocapnia and hyperoxia.
  • pHV lengthens seizure duration without compromising electroencephalographic trace quality.
  • pHV is a generalizable and potentially cost-effective method to improve ECT procedures.