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Forsyth R, Allen M, Bedson E, Downes A, Gough C, Hartshorn S, Lawton K, Lyttle MD, Messahel S, Mullen N, Raper J, Rosala-Harris A, Taggart L, Urron J, Walton E, Gamble C. Seizure control via pH manipulation: a phase II double-blind randomised controlled trial of inhaled carbogen as adjunctive treatment of paediatric convulsive status epilepticus (Carbogen for Status Epilepticus in Children Trial (CRESCENT)). Trials 2024; 25:349. [PMID: 38812049 PMCID: PMC11135009 DOI: 10.1186/s13063-024-08188-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Accepted: 05/17/2024] [Indexed: 05/31/2024] Open
Abstract
BACKGROUND Paediatric convulsive status epilepticus is the most common neurological emergency presenting to emergency departments. Risks of resultant neurological morbidity and mortality increase with seizure duration. If the seizure fails to stop within defined time-windows, standard care follows an algorithm of stepwise escalation to more intensive treatments, ultimately resorting to induction of general anaesthesia and ventilation. Additionally, ventilatory support may also be required to treat respiratory depression, a common unwanted effect of treatment. There is strong pre-clinical evidence that pH (acid-base balance) is an important determinant of seizure commencement and cessation, with seizures tending to start under alkaline conditions and terminate under acidic conditions. These mechanisms may be particularly important in febrile status epilepticus: prolonged fever-related seizures which predominantly affect very young children. This trial will assess whether imposition of mild respiratory acidosis by manipulation of inhaled medical gas improves response rates to first-line medical treatment. METHODS A double-blind, placebo-controlled trial of pH manipulation as an adjunct to standard medical treatment of convulsive status epilepticus in children. The control arm receives standard medical management whilst inhaling 100% oxygen; the active arm receives standard medical management whilst inhaling a commercially available mixture of 95% oxygen, 5% carbon dioxide known as 'carbogen'. Due to the urgent need to treat the seizure, deferred consent is used. The primary outcome is success of first-line treatment in seizure cessation. Planned subgroup analyses will be undertaken for febrile and non-febrile seizures. Secondary outcomes include rates of induction of general anaesthesia, admission to intensive care, adverse events, and 30-day mortality. DISCUSSION If safe and effective 95% oxygen, 5% carbon dioxide may be an important adjunct in the management of convulsive status epilepticus with potential for pre-hospital use by paramedics, families, and school staff. TRIAL REGISTRATION EudraCT: 2021-005367-49. CTA: 17136/0300/001. ISRCTN 52731862. Registered on July 2022.
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Affiliation(s)
- Rob Forsyth
- Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon Tyne, UK.
- Newcastle University, Newcastle Upon Tyne, UK.
| | - Maria Allen
- Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon Tyne, UK
| | - Emma Bedson
- Liverpool Clinical Trials Centre, University of Liverpool, Liverpool, UK
| | | | - Chris Gough
- Nottingham University Hospitals NHS Trust, Nottingham, UK
| | | | | | - Mark D Lyttle
- Emergency Department, Bristol Royal Hospital for Children, Bristol, UK
- Research in Emergency Care Avon Collaborative Hub (REACH), University of the West of England, Bristol, UK
| | | | - Niall Mullen
- Sunderland and South Tyneside NHS Foundation Trust, Sunderland, UK
| | - Joseph Raper
- Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon Tyne, UK
| | - Anna Rosala-Harris
- Liverpool Clinical Trials Centre, University of Liverpool, Liverpool, UK
| | - Leigh Taggart
- Liverpool Clinical Trials Centre, University of Liverpool, Liverpool, UK
| | - Jason Urron
- Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon Tyne, UK
| | - Emily Walton
- University Hospitals Sussex NHS Foundation Trust, Worthing, UK
| | - Carrol Gamble
- Liverpool Clinical Trials Centre, University of Liverpool, Liverpool, UK
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Gómez-Arnau J, de Arriba-Arnau A, Correas-Lauffer J, Urretavizcaya M. Hyperventilation and electroconvulsive therapy: A literature review. Gen Hosp Psychiatry 2018; 50:54-62. [PMID: 29054017 DOI: 10.1016/j.genhosppsych.2017.09.003] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Revised: 09/19/2017] [Accepted: 09/20/2017] [Indexed: 11/15/2022]
Abstract
BACKGROUND Hyperventilation has been proposed as an augmentation strategy in electroconvulsive therapy (ECT) in accordance with its proconvulsant effect. OBJECTIVE This study reviews the existing literature on the application of hyperventilation in ECT, its efficacy, and tolerance. METHODS A systematic search was performed in PubMed and EMBASE databases. Search terms ('electroconvulsive therapy' and 'hyperventilation', 'ventilation', 'hyperoxygenation', 'hyperoxia', 'hypocapnia') were used to retrieve works from 1966 to June 2016. Works that described hyperventilation manoeuvres in ECT settings and their clinical repercussion were included in the review. RESULTS A total of 17 observational and experimental studies were selected. An important heterogeneity in study designs, samples and ECT conditions, was detected. Findings support a positive influence of hyperventilation on seizure duration, which is the main study variable across different works. Effects of hyperventilation on seizure threshold and quality parameters have been less thoroughly studied. Systematic recording of clinical outcomes and adverse effects of hyperventilation is uncommon. CONCLUSIONS The literature suggests that hyperventilation may be an effective and safe technique to enhance ECT, but many aspects remain to be studied. Further investigations, especially controlled clinical trials, are necessary and should result in a specific and reliable hyperventilation protocol for ECT settings.
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Affiliation(s)
| | - Aida de Arriba-Arnau
- Bellvitge University Hospital, Psychiatry Department, Bellvitge Biomedical Research Institute (IDIBELL) Neurosciences Group - Psychiatry and Mental Health, Barcelona, Spain
| | - Javier Correas-Lauffer
- Henares University Hospital, Psychiatry Department, Madrid, Spain; School of Medicine, Universidad Francisco de Vitoria, Madrid, Spain
| | - Mikel Urretavizcaya
- Bellvitge University Hospital, Psychiatry Department, Bellvitge Biomedical Research Institute (IDIBELL) Neurosciences Group - Psychiatry and Mental Health, Barcelona, Spain; Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Carlos III Health Institute, Spain; Department of Clinical Sciences, School of Medicine, Universitat de Barcelona, Barcelona, Spain.
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de Arriba-Arnau A, Dalmau A, Soria V, Salvat-Pujol N, Ribes C, Sánchez-Allueva A, Menchón JM, Urretavizcaya M. Protocolized hyperventilation enhances electroconvulsive therapy. J Affect Disord 2017; 217:225-232. [PMID: 28431383 DOI: 10.1016/j.jad.2017.04.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Revised: 02/13/2017] [Accepted: 04/02/2017] [Indexed: 11/24/2022]
Abstract
BACKGROUND Hyperventilation is recommended in electroconvulsive therapy (ECT) to enhance seizures and to increase patients' safety. However, more evidence is needed regarding its effects and the optimum method of application. METHODS This prospective study involving 21 subjects compared two procedures, protocolized hyperventilation (PHV) and hyperventilation as usual (HVau), applied to the same patient in two consecutive sessions. Transcutaneous partial pressure of carbon dioxide (TcPCO2) was measured throughout all sessions. Ventilation parameters, hemodynamic measures, seizure characteristics, and side effects were also explored. RESULTS PHV resulted in lower TcPCO2 after hyperventilation (p=.008) and over the whole session (p=.035). The lowest TcPCO2 was achieved after voluntary hyperventilation. Changes in TcPCO2 from baseline showed differences between HVau and PHV at each session time-point (all p<.05). Between- and within-subjects factors were statistically significant in a general linear model. Seizure duration was greater in PHV sessions (p=.028), without differences in other seizure quality parameters or adverse effects. Correlations were found between hypocapnia induction and seizure quality indexes. LIMITATIONS Secondary outcomes could be underpowered. CONCLUSIONS PHV produces hypocapnia before the stimulus, modifies patients' TcPCO2 values throughout the ECT session and lengthens seizure duration. Voluntary hyperventilation is the most important part of the PHV procedure with respect to achieving hypocapnia. A specific ventilation approach, CO2 quantification and monitoring may be advisable in ECT. PHV is easy to apply in daily clinical practice and does not imply added costs. Ventilation management has promising effects in terms of optimizing ECT technique.
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Affiliation(s)
- Aida de Arriba-Arnau
- Psychiatry Department, Bellvitge University Hospital, Bellvitge Biomedical Research Institute (IDIBELL) Neurosciences Group-Psychiatry and Mental Health, L'Hospitalet de Llobregat, Barcelona, Spain
| | - Antonia Dalmau
- Department of Anesthesiology, Reanimation and Pain Clinic, Bellvitge University Hospital, L´Hospitalet de Llobregat, Barcelona, Spain; University of Barcelona, Barcelona, Spain
| | - Virginia Soria
- Psychiatry Department, Bellvitge University Hospital, Bellvitge Biomedical Research Institute (IDIBELL) Neurosciences Group-Psychiatry and Mental Health, L'Hospitalet de Llobregat, Barcelona, Spain; University of Barcelona, Barcelona, Spain; CIBERSAM, Spain
| | - Neus Salvat-Pujol
- Psychiatry Department, Bellvitge University Hospital, Bellvitge Biomedical Research Institute (IDIBELL) Neurosciences Group-Psychiatry and Mental Health, L'Hospitalet de Llobregat, Barcelona, Spain
| | - Carmina Ribes
- Department of Anesthesiology, Reanimation and Pain Clinic, Bellvitge University Hospital, L´Hospitalet de Llobregat, Barcelona, Spain
| | - Ana Sánchez-Allueva
- Department of Anesthesiology, Reanimation and Pain Clinic, Bellvitge University Hospital, L´Hospitalet de Llobregat, Barcelona, Spain
| | - José Manuel Menchón
- Psychiatry Department, Bellvitge University Hospital, Bellvitge Biomedical Research Institute (IDIBELL) Neurosciences Group-Psychiatry and Mental Health, L'Hospitalet de Llobregat, Barcelona, Spain; University of Barcelona, Barcelona, Spain; CIBERSAM, Spain
| | - Mikel Urretavizcaya
- Psychiatry Department, Bellvitge University Hospital, Bellvitge Biomedical Research Institute (IDIBELL) Neurosciences Group-Psychiatry and Mental Health, L'Hospitalet de Llobregat, Barcelona, Spain; University of Barcelona, Barcelona, Spain; CIBERSAM, Spain.
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de Arriba-Arnau A, Dalmau A, Salvat-Pujol N, Soria V, Bocos J, Menchón JM, Urretavizcaya M. Hypocapnia and hyperoxia induction using a hyperventilation protocol in electroconvulsive therapy. REVISTA DE PSIQUIATRIA Y SALUD MENTAL 2016; 10:21-27. [PMID: 27311640 DOI: 10.1016/j.rpsm.2016.04.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Revised: 03/19/2016] [Accepted: 04/19/2016] [Indexed: 10/21/2022]
Abstract
INTRODUCTION Hyperventilation in electroconvulsive therapy sessions has been associated with seizure threshold, seizure characteristics, and cognitive effects. There is no consensus on the optimal procedure of applying hyperventilation manoeuvres during electroconvulsive therapy. MATERIAL AND METHODS Prospective evaluation of the effects of systematic use of hyperventilation manoeuvres with facial mask and capnography (protocolized hyperventilation [pHV]), on ventilation parameters and on seizures. The study included a sample of 130 sessions (65 performed according to hyperventilation standard practice and 65 successive sessions, with pHV) of 35 patients over a period of 10 weeks. RESULTS The pHV manoeuvres reduced exhaled CO2 and increased O2 saturation significantly (P<.001). The average CO2 reduction achieved was 6.52±4.75mmHg (95% CI -7.7 to -5.3). The CO2 values after pHV correlated significantly with seizure duration and O2 values, with other electroencephalographic quality indices. In pHV sessions, compared with sessions performed according to hyperventilation standard practice, the average lengthening of the motor and electroencephalographic seizure was 3.86±14.62 and 4.73±13.95s, respectively. No differences were identified in other ictal quality parameters. CONCLUSIONS The proposed pHV manoeuvres significantly modify ventilation parameters. The hypocapnia and hyperoxia obtained by applying these manoeuvres lengthen the duration of seizures without worsening the quality of the electroencephalographic trace. The use of pHV is generalisable and might improve electroconvulsive therapy procedure without adding costs.
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Affiliation(s)
- Aida de Arriba-Arnau
- Grupo 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
| | - Antonia Dalmau
- Servicio de Anestesiología y Reanimación, Hospital Universitari de Bellvitge-Institut Català de la Salut (ICS), L'Hospitalet de Llobregat, Barcelona, España
| | - Neus Salvat-Pujol
- Grupo 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
| | - Virginia Soria
- Grupo 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; Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM) G17, Universitat de Barcelona (UB), Barcelona, España
| | - Javier Bocos
- Servicio de Anestesiología y Reanimación, Hospital Universitari de Bellvitge-Institut Català de la Salut (ICS), L'Hospitalet de Llobregat, Barcelona, España
| | - José Manuel Menchón
- Grupo 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; Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM) G17, Universitat de Barcelona (UB), Barcelona, España
| | - Mikel Urretavizcaya
- Grupo 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; Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM) G17, Universitat de Barcelona (UB), Barcelona, España.
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Electroconvulsive therapy can benefit from controlled hyperventilation using a laryngeal mask. Eur Arch Psychiatry Clin Neurosci 2011; 261 Suppl 2:S172-6. [PMID: 21901267 DOI: 10.1007/s00406-011-0240-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2011] [Accepted: 07/20/2011] [Indexed: 10/17/2022]
Abstract
Hypocapnia through hyperventilation is a well-known procedure in electroconvulsive therapy (ECT) to enhance seizure activity. However, it has mostly been applied in an uncontrolled manner. Originally intended for a better management of the supraglottic airway, laryngeal masks are more suited to monitor levels of CO(2) during hyperventilation than face masks and thereby provide for the possibility of controlled hyperventilation (CHV). The impact of CHV was retrospectively studied in 114 consecutive patients; 65 of them had received ECT with CHV and 49 had received ECT with uncontrolled hyperventilation (UHV) directly prior to the time period when the laryneal mask was introduced to the ECT treatment procedure. The CO(2) level in the CHV group was aimed at 30 mmHg or below. CHV considerably enhanced the seizure activity leading to changes in clinically determined parameters of the treatment course: the necessity for increasing the electric charge, for re-stimulations (trend) and for bilateral stimulations was lower in the CHV group as compared to the UHV group. The improvement in the Global Assessment of Functioning Scores was not different in both groups. CHV was associated with a higher amount of prolonged seizures, with a reduced number of delirious symptoms after treatments and an attenuating effect on heart rate. Concluding, CHV can help to maintain the applied electric charge low without worsening the clinical outcome. Therefore, it is a helpful technical improvement. However, it should be used carefully with regard to prolonged seizures.
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Eipe N, Tarshis J. A system of classification for the clinical applications of capnography. J Clin Monit Comput 2007; 21:341-4. [DOI: 10.1007/s10877-007-9094-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2007] [Accepted: 09/18/2007] [Indexed: 10/22/2022]
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