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Effect of Intravenous Ketamine on Hypocranial Pressure Symptoms in Patients with Spinal Anesthetic Cesarean Sections: A Systematic Review and Meta-Analysis. J Clin Med 2022; 11:jcm11144129. [PMID: 35887893 PMCID: PMC9317657 DOI: 10.3390/jcm11144129] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2022] [Revised: 07/09/2022] [Accepted: 07/11/2022] [Indexed: 12/22/2022] Open
Abstract
Background: Pregnant women are more likely to suffer post-puncture symptoms such as headaches and nausea due to the outflow of cerebrospinal fluid after spinal anesthesia. Because ketamine has the effect of raising intracranial pressure, it may be able to improve the symptoms of perioperative hypocranial pressure and effectively prevent the occurrence of hypocranial pressure-related side effects. Method: Keywords such as ketamine, cesarean section, and spinal anesthesia were searched in databases including Medline, Embase, Web of Science, and Cochrane from 1976 to 2021. Thirteen randomized controlled trials were selected for the meta-analysis. Results: A total of 12 randomized trials involving 2099 participants fulfilled the inclusion criteria. There was no significant association between ketamine and the risk of headaches compared to the placebo (RR = 1.12; 95% CI: 0.53, 2.35; p = 0.77; I² = 62%). There was no significant association between ketamine and nausea compared to the placebo (RR = 0.66; 95% CI: 0.40, 1.09; p = 0.10; I² = 57%). No significant associations between ketamine or the placebo and vomiting were found (RR = 0.94; 95% CI: 0.53, 1.67; p = 0.83; I² = 72%). Conclusion: Intravenous ketamine does not improve the symptoms caused by low intracranial pressure after spinal anesthesia in patients undergoing cesarean section.
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Karami T, Hoshyar H, Jafari AF. The effect of pregabalin on postdural puncture headache among patients undergoing elective cesarean section: A randomized controlled trial. Ann Med Surg (Lond) 2021; 64:102226. [PMID: 33850624 PMCID: PMC8022150 DOI: 10.1016/j.amsu.2021.102226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Revised: 03/10/2021] [Accepted: 03/10/2021] [Indexed: 11/22/2022] Open
Abstract
INTRODUCTION Post-dural puncture headache (PDPH) is one of the most common problems of cesarean section. The present study aimed to evaluate the effect of pregabalin on PDPH among patients undergoing elective cesarean section. MATERIALS AND METHODS This double-blind clinical trial was performed on 136 patients undergoing elective cesarean section referred to Shahid Motahari Teaching Hospital in Urmia in northwestern Iran from February 1 to December 20, 2020. Patients were selected by convenience sampling method and randomly divided into two groups of intervention and control (N = 68 people each group). The presence of PDPH and its severity were recorded in the checklist based on the VAS, and conventional treatments were prescribed in the case of occurrence of the PDPH. The PDPH severity was also assessed by the patient using the 10-cm Visual Analog Scale (VAS). RESULTS The mean age of participants was 27.82 years. A total of 29 people suffered from hypotension. Regarding pain severity, the mean pain score in the intervention group was significantly lower than the control group (p = 0.01). Results also showed that the frequency of PDPH in the intervention group was significantly lower than the placebo group (4.4% vs. 11.8%; p = 0.019). There was no significant difference between intervention and control groups in terms of demographic characteristics (p > 0.05). CONCLUSION Results of the present study showed the use of oral pregabalin at night before spinal anesthesia in patients undergoing elective cesarean(C-) section had a preventive effect on the severity and incidence of PDPH.
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Affiliation(s)
- Tohid Karami
- Department of Anesthesiology, School of Medicine, Urmia University of Medical Sciences, Urmia, Iran
| | - Hadi Hoshyar
- Department of Anesthesiology, School of Medicine, Urmia University of Medical Sciences, Urmia, Iran
| | - Amin Farid Jafari
- Department of Anesthesiology, School of Medicine, Urmia University of Medical Sciences, Urmia, Iran
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Aydın HE, Kızmazoglu C, Kaya I, Husemoglu B, Sozer G, Havıtcıoglu H, Arslantas A. Biomechanical Properties of the Cranial Dura Mater with Puncture Defects : An In Vitro Study. J Korean Neurosurg Soc 2019; 62:382-388. [PMID: 31089067 PMCID: PMC6616988 DOI: 10.3340/jkns.2018.0130] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Accepted: 09/01/2018] [Indexed: 11/27/2022] Open
Abstract
Objective The primary aim of this investigation was to explore the nature of dura mater biomechanics following the introduction of puncture defect(s).
Methods Twenty-eight dura mater specimens were collected during autopsy from the department of forensic medicine of the authors' institution. Specimens were divided randomly into one of four groups : group I (cranial dura mater; n=7), group II (cranial dura mater with one puncture defect; n=7); group III (cranial dura mater with two puncture defects; n=7), and group IV (cranial dura mater with three puncture defects; n=7).
Results The mean±standard deviation tensile strengths of the dura mater were 8.35±3.16, 8.22±3.32, 7.13±1.77, and 6.94±1.93 MPa for groups I, II, III, and IV, respectively. There was no statistical difference between all groups. A single, two or more punctures of the dura mater using a 20-gauge Quincke needle did not affect cranial dura tensile strength.
Conclusion This biomechanical study may contribute to the future development of artificial dura mater substitutes and medical needles that have a lower negative impact on the biomechanical properties of dura mater.
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Affiliation(s)
- Hasan Emre Aydın
- Department of Neurosurgery, Kutahya Health Science University, Kutahya, Turkey
| | - Ceren Kızmazoglu
- Department of Neurosurgery, Dokuz Eylul University School of Medicine, Izmir, Turkey
| | - Ismail Kaya
- Department of Neurosurgery, Kutahya Health Science University, Kutahya, Turkey
| | - Bugra Husemoglu
- Department of Biomechanics, Dokuz Eylul University School of Medicine Health Science Institute, Izmir, Turkey
| | - Gulden Sozer
- Department of Pathology, Forensic Medicine Institution , Izmir, Turkey
| | - Hasan Havıtcıoglu
- Department of Biomechanics, Dokuz Eylul University School of Medicine Health Science Institute, Izmir, Turkey
| | - Ali Arslantas
- Department of Neurosurgery, Eskişehir Osmangazi University School of Medicine, Eskisehir, Turkey
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Song J, Zhang T, Choy A, Penaco A, Joseph V. Impact of obesity on post-dural puncture headache. Int J Obstet Anesth 2017; 30:5-9. [DOI: 10.1016/j.ijoa.2016.10.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Revised: 09/04/2016] [Accepted: 10/24/2016] [Indexed: 01/03/2023]
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Arevalo‐Rodriguez I, Muñoz L, Godoy‐Casasbuenas N, Ciapponi A, Arevalo JJ, Boogaard S, Roqué i Figuls M. Needle gauge and tip designs for preventing post-dural puncture headache (PDPH). Cochrane Database Syst Rev 2017; 4:CD010807. [PMID: 28388808 PMCID: PMC6478120 DOI: 10.1002/14651858.cd010807.pub2] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
BACKGROUND Post-dural puncture headache (PDPH) is one of the most common complications of diagnostic and therapeutic lumbar punctures. PDPH is defined as any headache occurring after a lumbar puncture that worsens within 15 minutes of sitting or standing and is relieved within 15 minutes of the patient lying down. Researchers have suggested many types of interventions to help prevent PDPH. It has been suggested that aspects such as needle tip and gauge can be modified to decrease the incidence of PDPH. OBJECTIVES To assess the effects of needle tip design (traumatic versus atraumatic) and diameter (gauge) on the prevention of PDPH in participants who have undergone dural puncture for diagnostic or therapeutic causes. SEARCH METHODS We searched CENTRAL, MEDLINE, Embase, CINAHL and LILACS, as well as trial registries via the World Health Organization (WHO) International Clinical Trials Registry Platform (ICTRP) search portal in September 2016. We adopted the MEDLINE strategy for searching the other databases. The search terms we used were a combination of thesaurus-based and free-text terms for both interventions (lumbar puncture in neurological, anaesthesia or myelography settings) and headache. SELECTION CRITERIA We included randomized controlled trials (RCTs) conducted in any clinical/research setting where dural puncture had been used in participants of all ages and both genders, which compared different tip designs or diameters for prevention of PDPH DATA COLLECTION AND ANALYSIS: We used the standard methodological procedures expected by Cochrane. MAIN RESULTS We included 70 studies in the review; 66 studies with 17,067 participants were included in the quantitative analysis. An additional 18 studies are awaiting classification and 12 are ongoing. Fifteen of the 18 studies awaiting classification mainly correspond to congress summaries published before 2010, in which the available information does not allow the complete evaluation of all their risks of bias and characteristics. Our main outcome was prevention of PDPH, but we also assessed the onset of severe PDPH, headache in general and adverse events. The quality of evidence was moderate for most of the outcomes mainly due to risk of bias issues. For the analysis, we undertook three main comparisons: 1) traumatic needles versus atraumatic needles; 2) larger gauge traumatic needles versus smaller gauge traumatic needles; and 3) larger gauge atraumatic needles versus smaller gauge atraumatic needles. For each main comparison, if data were available, we performed a subgroup analysis evaluating lumbar puncture indication, age and posture.For the first comparison, the use of traumatic needles showed a higher risk of onset of PDPH compared to atraumatic needles (36 studies, 9378 participants, risk ratio (RR) 2.14, 95% confidence interval (CI) 1.72 to 2.67, I2 = 9%).In the second comparison of traumatic needles, studies comparing various sizes of large and small gauges showed no significant difference in effects in terms of risk of PDPH, with the exception of one study comparing 26 and 27 gauge needles (one study, 658 participants, RR 6.47, 95% CI 2.55 to 16.43).In the third comparison of atraumatic needles, studies comparing various sizes of large and small gauges showed no significant difference in effects in terms of risk of PDPH.We observed no significant difference in the risk of paraesthesia, backache, severe PDPH and any headache between traumatic and atraumatic needles. Sensitivity analyses of PDPH results between traumatic and atraumatic needles omitting high risk of bias studies showed similar results regarding the benefit of atraumatic needles in the prevention of PDPH (three studies, RR 2.78, 95% CI 1.26 to 6.15; I2 = 51%). AUTHORS' CONCLUSIONS There is moderate-quality evidence that atraumatic needles reduce the risk of post-dural puncture headache (PDPH) without increasing adverse events such as paraesthesia or backache. The studies did not report very clearly on aspects related to randomization, such as random sequence generation and allocation concealment, making it difficult to interpret the risk of bias in the included studies. The moderate quality of the evidence for traumatic versus atraumatic needles suggests that further research is likely to have an important impact on our confidence in the estimate of effect.
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Affiliation(s)
- Ingrid Arevalo‐Rodriguez
- Universidad Tecnológica EquinoccialCochrane Ecuador. Centro de Investigación en Salud Pública y Epidemiología Clínica (CISPEC). Facultad de Ciencias de la Salud Eugenio EspejoAv. Mariscal Sucre s/n y Av. Mariana de JesúsQuitoEcuador
- Fundacion Universitaria de Ciencias de la Salud ‐ Hospital de San Jose/Hospital Infantil de San JoseDivision of ResearchBogotá D.C.Colombia
| | - Luis Muñoz
- Hospital de San José, Fundación Universitaria de Ciencias de la SaludDepartment of Anaesthesia10th Street No 18‐75Bogotá D.C.Colombia
| | - Natalia Godoy‐Casasbuenas
- Fundación Universitaria de Ciencias de la Salud ‐ Hospital de San José/Hospital Infantil de San JoséDivision of ResearchBogotáColombia
| | - Agustín Ciapponi
- Institute for Clinical Effectiveness and Health Policy (IECS‐CONICET)Argentine Cochrane CentreDr. Emilio Ravignani 2024Buenos AiresCapital FederalArgentinaC1414CPV
| | - Jimmy J Arevalo
- Hospital de San José, Fundación Universitaria de Ciencias de la SaludDepartment of Anaesthesia10th Street No 18‐75Bogotá D.C.Colombia
- VU University Medical CenterDepartment of AnesthesiologyAmsterdamNetherlands
| | - Sabine Boogaard
- VU University Medical CenterDepartment of AnesthesiologyAmsterdamNetherlands
| | - Marta Roqué i Figuls
- CIBER Epidemiología y Salud Pública (CIBERESP)Iberoamerican Cochrane Centre, Biomedical Research Institute Sant Pau (IIB Sant Pau)Sant Antoni Maria Claret 171Edifici Casa de ConvalescènciaBarcelonaCatalunyaSpain08041
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Electron Microscopy of Dural and Arachnoid Disruptions After Subarachnoid Block. Reg Anesth Pain Med 2017; 42:709-718. [DOI: 10.1097/aap.0000000000000667] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Arevalo-Rodriguez I, Ciapponi A, Roqué i Figuls M, Muñoz L, Bonfill Cosp X. Posture and fluids for preventing post-dural puncture headache. Cochrane Database Syst Rev 2016; 3:CD009199. [PMID: 26950232 PMCID: PMC6682345 DOI: 10.1002/14651858.cd009199.pub3] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND Post-dural puncture headache (PDPH) is a common complication of lumbar punctures. Several theories have identified the leakage of cerebrospinal fluid (CSF) through the hole in the dura as a cause of this side effect. It is therefore necessary to take preventive measures to avoid this complication. Prolonged bed rest has been used to treat PDPH once it has started, but it is unknown whether prolonged bed rest can also be used to prevent it. Similarly, the value of administering fluids additional to those of normal dietary intake to restore the loss of CSF produced by the puncture is unknown. This review is an update of a previously published review in the Cochrane Database of Systematic Reviews (Issue 7, 2013) on "Posture and fluids for preventing post-dural puncture headache". OBJECTIVES To assess whether prolonged bed rest combined with different body and head positions, as well as administration of supplementary fluids after lumbar puncture, prevent the onset of PDPH in people undergoing lumbar puncture for diagnostic or therapeutic purposes. SEARCH METHODS We searched the Cochrane Central Register of Controlled Trials (CENTRAL), MEDLINE, EMBASE, and LILACS, as well as trial registries up to February 2015. SELECTION CRITERIA We identified randomized controlled trials that compared the effects of bed rest versus immediate mobilization, head-down tilt versus horizontal position, prone versus supine positions during bed rest, and administration of supplementary fluids versus no/less supplementation, as prevention measures for PDPH in people who have undergone lumbar puncture. DATA COLLECTION AND ANALYSIS Two review authors independently assessed the studies for eligibility through the web-based software EROS (Early Review Organizing Software). Two different review authors independently assessed risk of bias using the criteria outlined in the Cochrane Handbook for Systematic Reviews of Interventions. We resolved any disagreements by consensus. We extracted data on cases of PDPH, severe PDPH, and any headache after lumbar puncture and performed intention-to-treat analyses and sensitivity analyses by risk of bias. We assessed the evidence using GRADE (Grading of Recommendations Assessment, Development and Evaluation) and created a 'Summary of findings' table. MAIN RESULTS We included 24 trials with 2996 participants in this updated review. The number of participants in each trial varied from 39 to 382. Most of the included studies compared bed rest versus immediate mobilization, and only two assessed the effects of supplementary fluids versus no supplementation. We judged the overall risk of bias of the included studies as low to unclear. The overall quality of evidence was low to moderate, downgraded because of the risk of bias assessment in most cases. The primary outcome in our review was the presence of PDPH.There was low quality evidence for an absence of benefits associated with bed rest compared with immediate mobilization on the incidence of severe PDPH (risk ratio (RR) 0.98; 95% confidence interval (CI) 0.68 to 1.41; participants = 1568; studies = 9) and moderate quality evidence on the incidence of any headache after lumbar puncture (RR 1.16; 95% CI 1.02 to 1.32; participants = 2477; studies = 18). Furthermore, bed rest probably increased PDPH (RR 1.24; 95% CI 1.04 to 1.48; participants = 1519; studies = 12) compared with immediate mobilization. An analysis restricted to the most methodologically rigorous trials (i.e. those with low risk of bias in allocation method, missing data and blinding of outcome assessment) gave similar results. There was low quality evidence for an absence of benefits associated with fluid supplementation on the incidence of severe PDPH (RR 0.67; 95% CI 0.26 to 1.73; participants = 100; studies = 1) and PDPH (RR 1; 95% CI 0.59 to 1.69; participants = 100; studies = 1), and moderate quality evidence on the incidence of any headache after lumbar puncture (RR 0.94; 95% CI 0.66 to 1.34; participants = 200; studies = 2). We did not expect other adverse events and did not assess them in this review. AUTHORS' CONCLUSIONS Since the previous version of this review, we found one new study for inclusion, but the conclusion remains unchanged. We considered the quality of the evidence for most of the outcomes assessed in this review to be low to moderate. As identified studies had shortcomings on aspects related to randomization and blinding of outcome assessment, we therefore downgraded the quality of the evidence. In general, there was no evidence suggesting that routine bed rest after dural puncture is beneficial for the prevention of PDPH onset. The role of fluid supplementation in the prevention of PDPH remains unclear.
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Affiliation(s)
- Ingrid Arevalo-Rodriguez
- Division of Research, Fundación Universitaria de Ciencias de la Salud - Hospital de San José/Hospital Infantil de San José, Carrera 19 Nº 8a - 32, Bogotá D.C., Colombia, 11001
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Abstract
BACKGROUND This is an updated version of the original Cochrane review published in Issue 8, 2011, on 'Drug therapy for treating post-dural puncture headache'.Post-dural puncture headache (PDPH) is the most common complication of lumbar puncture, an invasive procedure frequently performed in the emergency room. Numerous pharmaceutical drugs have been proposed to treat PDPH but there are still some uncertainties about their clinical effectiveness. OBJECTIVES To assess the effectiveness and safety of drugs for treating PDPH in adults and children. SEARCH METHODS The searches included the Cochrane Central Register of Controlled Trials (CENTRAL 2014, Issue 6), MEDLINE and MEDLINE in Process (from 1950 to 29 July 2014), EMBASE (from 1980 to 29 July 2014) and CINAHL (from 1982 to July 2014). There were no language restrictions. SELECTION CRITERIA We considered randomised controlled trials (RCTs) assessing the effectiveness of any pharmacological drug used for treating PDPH. Outcome measures considered for this review were: PDPH persistence of any severity at follow-up (primary outcome), daily activity limited by headache, conservative supplementary therapeutic option offered, epidural blood patch performed, change in pain severity scores, improvements in pain severity scores, number of days participants stay in hospital, any possible adverse events and missing data. DATA COLLECTION AND ANALYSIS Review authors independently selected studies, assessed risk of bias and extracted data. We estimated risk ratios (RR) for dichotomous data and mean differences (MD) for continuous outcomes. We calculated a 95% confidence interval (CI) for each RR and MD. We did not undertake meta-analysis because the included studies assessed different sorts of drugs or different outcomes. We performed an intention-to-treat (ITT) analysis. MAIN RESULTS We included 13 small RCTs (479 participants) in this review (at least 274 participants were women, with 118 parturients after a lumbar puncture for regional anaesthesia). In the original version of this Cochrane review, only seven small RCTs (200 participants) were included. Pharmacological drugs assessed were oral and intravenous caffeine, subcutaneous sumatriptan, oral gabapentin, oral pregabalin, oral theophylline, intravenous hydrocortisone, intravenous cosyntropin and intramuscular adrenocorticotropic hormone (ACTH).Two RCTs reported data for PDPH persistence of any severity at follow-up (primary outcome). Caffeine reduced the number of participants with PDPH at one to two hours when compared to placebo. Treatment with caffeine also decreased the need for a conservative supplementary therapeutic option.Treatment with gabapentin resulted in better visual analogue scale (VAS) scores after one, two, three and four days when compared with placebo and also when compared with ergotamine plus caffeine at two, three and four days. Treatment with hydrocortisone plus conventional treatment showed better VAS scores at six, 24 and 48 hours when compared with conventional treatment alone and also when compared with placebo. Treatment with theophylline showed better VAS scores compared with acetaminophen at two, six and 12 hours and also compared with conservative treatment at eight, 16 and 24 hours. Theophylline also showed a lower mean "sum of pain" when compared with placebo. Sumatriptan and ACTH did not show any relevant effect for this outcome.Theophylline resulted in a higher proportion of participants reporting an improvement in pain scores when compared with conservative treatment.There were no clinically significant drug adverse events.The rest of the outcomes were not reported by the included RCTs or did not show any relevant effect. AUTHORS' CONCLUSIONS None of the new included studies have provided additional information to change the conclusions of the last published version of the original Cochrane review. Caffeine has shown effectiveness for treating PDPH, decreasing the proportion of participants with PDPH persistence and those requiring supplementary interventions, when compared with placebo. Gabapentin, hydrocortisone and theophylline have been shown to decrease pain severity scores. Theophylline has also been shown to increase the proportion of participants that report an improvement in pain scores when compared with conventional treatment.There is a lack of conclusive evidence for the other drugs assessed (sumatriptan, adrenocorticotropic hormone, pregabalin and cosyntropin).These conclusions should be interpreted with caution, due to the lack of information to allow correct appraisal of risk of bias, the small sample sizes of the studies and also their limited generalisability, as nearly half of the participants were postpartum women in their 30s.
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Affiliation(s)
- Xavier Basurto Ona
- Emergency Department, Hospital de Figueres, Fundació Salut Empordà, Rda Rector Aroles s/n, Figueres, Girona-Catalunya, Spain, 17600
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Bisinotto FMB, Dezena RA, Abud TMV, Martins LB. [Cerebral venous thrombosis after spinal anesthesia: case report]. Rev Bras Anestesiol 2015; 67:305-310. [PMID: 25840468 DOI: 10.1016/j.bjan.2014.09.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Accepted: 09/10/2014] [Indexed: 11/18/2022] Open
Abstract
INTRODUCTION Cerebral venous thrombosis (CVT) is a rare, but serious complication after spinal anesthesia. It is often related to the presence of predisposing factors, such as pregnancy, puerperium, oral contraceptive use, and malignancies. Headache is the most common symptom. We describe a case of a patient who underwent spinal anesthesia who had postoperative headache complicated with CVT. CASE REPORT Male patient, 30 years old, ASA 1, who underwent uneventful arthroscopic knee surgery under spinal anesthesia. Forty-eight hours after the procedure, the patient showed frontal, orthostatic headache that improved when positioned supine. Diagnosis of sinusitis was made in the general emergency room, and he received symptomatic medication. In subsequent days, the headache worsened with holocranial location and with little improvement in the supine position. The patient presented with left hemiplegia followed by tonic-clonic seizures. He underwent magnetic resonance venography; diagnosed with CVT. Analysis of procoagulant factors identified the presence of lupus anticoagulant antibody. The patient received anticonvulsants and anticoagulants and was discharged eight days without sequelae. DISCUSSION Any patient presenting with postural headache after spinal anesthesia, which intensifies after a plateau, loses its orthostatic characteristic or become too long, should undergo imaging tests to rule out more serious complications, such as CVT. The loss of cerebrospinal fluid leads to dilation and venous stasis that, coupled with the traction caused by the upright position, can lead to TVC in some patients with prothrombotic conditions.
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Affiliation(s)
- Flora Margarida Barra Bisinotto
- Universidade Federal do Triângulo Mineiro, Disciplina de Anestesiologia, Uberaba, MG, Brasil; Universidade Federal do Triângulo Mineiro, Hospital de Clínicas, Uberaba, MG, Brasil.
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Bicket MC, Chakravarthy K, Chang D, Cohen SP. Epidural steroid injections: an updated review on recent trends in safety and complications. Pain Manag 2015; 5:129-46. [DOI: 10.2217/pmt.14.53] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
SUMMARY Epidural steroid injections (ESIs), which can provide significant but temporary pain relief in well-selected patients, are the most commonly performed procedure in pain management. The anatomy of the epidural space provides a framework for understanding risks associated with ESIs, a topic relevant to both patients and physicians in interventional pain, surgery and primary care. Safety considerations of epidural steroids include drug preparation and myriad physiological effects stemming from steroid exposure. Although major complications associated with ESI occur rarely, potentially catastrophic events resulting from infectious, hematologic and neurologic morbidity may lead to permanent injury. The safety profile of ESIs may improve with development and dissemination of sound injection technique, safer compounds manufactured in a sterile manner and deficient of thromboembolic potential and the application of existing technology.
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Affiliation(s)
- Mark C Bicket
- Department of Anesthesiology, Critical Care & Pain Medicine, Massachusetts General Hospital, 55 Fruit Street, Boston, MA 02114, USA
| | - Krishnan Chakravarthy
- Department of Anesthesiology & Critical Care Medicine, Johns Hopkins Pain Treatment Center, 550 North Broadway, Suite 301, Baltimore, MD 21205, USA
| | - David Chang
- Department of Anesthesiology & Critical Care Medicine, Johns Hopkins Pain Treatment Center, 550 North Broadway, Suite 301, Baltimore, MD 21205, USA
| | - Steven P Cohen
- Department of Anesthesiology & Critical Care Medicine, Johns Hopkins Pain Treatment Center, 550 North Broadway, Suite 301, Baltimore, MD 21205, USA
- Department of Physical Medicine & Rehabilitation, Johns Hopkins School of Medicine, 707 North Broadway, Baltimore, MD 21205, USA
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Incidence of neurological complications and post-dural puncture headache after regional anesthesia in obstetric practice: A retrospective study of 2399 patients. COLOMBIAN JOURNAL OF ANESTHESIOLOGY 2014. [DOI: 10.1016/j.rcae.2013.09.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Incidence of neurological complications and post-dural puncture headache after regional anesthesia in obstetric practice: A retrospective study of 2399 patients☆. COLOMBIAN JOURNAL OF ANESTHESIOLOGY 2014. [DOI: 10.1097/01819236-201442010-00006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
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Dias Cicarelli D, Frerichs E, Martins Benseñor FE. Incidencia de complicaciones neurológicas y cefalea pospunción dural luego de anestesia regional en la práctica obstétrica: un estudio retrospectivo de 2399 pacientes. COLOMBIAN JOURNAL OF ANESTHESIOLOGY 2014. [DOI: 10.1016/j.rca.2013.09.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
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Arevalo-Rodriguez I, Muñoz L, Arevalo JJ, Ciapponi A, Roqué i Figuls M. Needle gauge and tip designs for preventing post-dural puncture headache (PDPH). Cochrane Database Syst Rev 2013. [DOI: 10.1002/14651858.cd010807] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Arevalo-Rodriguez I, Ciapponi A, Munoz L, Roqué i Figuls M, Bonfill Cosp X. Posture and fluids for preventing post-dural puncture headache. Cochrane Database Syst Rev 2013:CD009199. [PMID: 23846960 DOI: 10.1002/14651858.cd009199.pub2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
BACKGROUND Post-dural puncture headache (PDPH) is a common complication of lumbar punctures. Several theories have identified the leakage of cerebrospinal fluid (CSF) through the hole in the dura as a cause of this side effect. Therefore, it is necessary to take preventive measures to avoid this complication. Prolonged bed rest has been used as a therapeutic measure once PDPH has started, but it is unknown if it can be also be used to prevent it. Similarly, the value of administering fluids additional to those of normal dietary intake to restore the loss of CSF produced by the puncture is unknown. OBJECTIVES To assess whether prolonged bed rest combined with different body and head positions, as well as administration of supplementary fluids after lumbar puncture, prevent the onset of PDPH in people undergoing lumbar puncture for diagnostic or therapeutic purposes. SEARCH METHODS We searched the Cochrane Controlled Trials Register, MEDLINE, EMBASE, and LILACS up to June 2013. SELECTION CRITERIA We identified randomized controlled trials (RCTs) that compared the effects of bed rest versus early/immediate mobilization, head-down tilt versus horizontal position, prone versus supine positions during bed rest, and administration of supplementary fluids versus no/less supplementation, as prevention measures for PDPH in people who have undergone lumbar puncture. DATA COLLECTION AND ANALYSIS Two review authors independently assessed the studies for eligibility through the web-based software EROS (Early Review Organizing Software). Two different review authors independently assessed risk of bias using the criteria outlined in the Cochrane Handbook for Systematic Reviews of Interventions. We solved any disagreements by consensus. We extracted data on cases of PDPH, severe PDPH, and any headache after lumbar puncture and performed intention-to-treat analyses and sensitivity analyses by risk of bias. MAIN RESULTS We included 23 trials (2477 participants) in this review. There was no beneficial effect associated with bed rest compared with immediate mobilization on the incidence of PDPH (risk for bed rest 26.4%; risk for mobilization 20.5%; risk ratio (RR) 1.30; 95% confidence interval (CI) 1.09 to 1.55), severe PDPH (risk for bed rest 10.6%; risk for mobilization 10.7%; RR 1.00; 95% CI 0.75 to 1.32), and presence of any headache after lumbar puncture (risk for bed rest 33.6%; risk for mobilization 28.6%; RR 1.18; 95% CI 1.05 to 1.32). Analyses restricted to the most methodologically rigorous trials gave similar results. Likewise, the two trials that assessed fluid supplementation did not find this preventive measure to be useful in the prevention of PDPH. AUTHORS' CONCLUSIONS There is no evidence from RCTs that suggests that routine bed rest after dural puncture is beneficial for the prevention of PDPH onset. The role of fluid supplementation in the prevention of PDPH remains unclear.
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Affiliation(s)
- Ingrid Arevalo-Rodriguez
- Division of Research, Fundación Universitaria de Ciencias de la Salud, Hospital de San José/ Hospital Infantil de San José, BogotáD.C., Colombia.
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Basurto Ona X, Uriona Tuma SM, Martínez García L, Solà I, Bonfill Cosp X. Drug therapy for preventing post-dural puncture headache. Cochrane Database Syst Rev 2013; 2013:CD001792. [PMID: 23450533 PMCID: PMC8406520 DOI: 10.1002/14651858.cd001792.pub3] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
BACKGROUND Post-dural (post-lumbar or post-spinal) puncture headache (PDPH) is one of the most common complications of diagnostic, therapeutic or inadvertent lumbar punctures. Many drug options have been used to prevent headache in clinical practice and have also been tested in some clinical studies, but there are still some uncertainties about their clinical effectiveness. OBJECTIVES To assess the effectiveness and safety of drugs for preventing PDPH in adults and children. SEARCH METHODS The search strategy included the Cochrane Central Register of Controlled Trials (CENTRAL, The Cochrane Library 2012, Issue 5), MEDLINE (from 1950 to May 2012), EMBASE (from 1980 to May 2012) and CINAHL (from 1982 to June 2012). There was no language restriction. SELECTION CRITERIA We considered randomised controlled trials (RCTs) that assessed the effectiveness of any drug used for preventing PDPH. DATA COLLECTION AND ANALYSIS Review authors independently selected studies, assessed risks of bias and extracted data. We estimated risk ratios (RR) for dichotomous data and mean differences (MD) for continuous outcomes. We calculated a 95% confidence interval (CI) for each RR and MD. We did not undertake meta-analysis because participants' characteristics or assessed doses of drugs were too different in the included studies. We performed an intention-to-treat (ITT) analysis. MAIN RESULTS We included 10 RCTs (1611 participants) in this review with a majority of women (72%), mostly parturients (women in labour) (913), after a lumbar puncture for regional anaesthesia. Drugs assessed were epidural and spinal morphine, spinal fentanyl, oral caffeine, rectal indomethacin, intravenous cosyntropin, intravenous aminophylline and intravenous dexamethasone.All the included RCTs reported data on the primary outcome, i.e. the number of participants affected by PDPH of any severity after a lumbar puncture. Epidural morphine and intravenous cosyntropin reduced the number of participants affected by PDPH of any severity after a lumbar puncture when compared to placebo. Also, intravenous aminophylline reduced the number of participants affected by PDPH of any severity after a lumbar puncture when compared to no intervention, while intravenous dexamethasone increased it. Spinal morphine increased the number of participants affected by pruritus when compared to placebo, and epidural morphine increased the number of participants affected by nausea and vomiting when compared to placebo. Oral caffeine increased the number of participants affected by insomnia when compared to placebo.The remainder of the interventions analysed did not show any relevant effect for any of the outcomes.None of the included RCTs reported the number of days that patients stayed in hospital. AUTHORS' CONCLUSIONS Morphine and cosyntropin have shown effectiveness for reducing the number of participants affected by PDPH of any severity after a lumbar puncture, when compared to placebo, especially in patients with high risk of PDPH, such as obstetric patients who have had an inadvertent dural puncture. Aminophylline also reduced the number of participants affected by PDPH of any severity after a lumbar puncture when compared to no intervention in patients undergoing elective caesarean section. Dexamethasone increased the risk of PDPH, after spinal anaesthesia for caesarean section, when compared to placebo. Morphine also increased the number of participants affected by adverse events (pruritus and nausea and vomiting)There is a lack of conclusive evidence for the other drugs assessed (fentanyl, caffeine, indomethacin and dexamethasone).These conclusions should be interpreted with caution, owing to the lack of information, to allow correct appraisal of risk of bias and the small sample sizes of studies.
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Affiliation(s)
- Xavier Basurto Ona
- Emergency Department, Hospital de Figueres, Fundació Salut Empordà, Figueres, Spain.
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Amorim JA, Gomes de Barros MV, Valença MM. Post-dural (post-lumbar) puncture headache: risk factors and clinical features. Cephalalgia 2012; 32:916-23. [PMID: 22843225 DOI: 10.1177/0333102412453951] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
OBJECTIVE This is an analytic, interventional, cross sectional study to evaluate the risk factors of post-dural (post-lumbar) puncture headache (PDPH) and the validity of the diagnostic criteria for PDPH from the ICHD II. METHODS Six-hundred-and-forty patients (332 non-pregnant women and 308 men) aged 8-65 years underwent spinal anesthesia with Quincke 25G or 27G needles in elective surgery. RESULTS Forty-eight (7.5%) of the patients developed PDPH. The binary logistic regression analysis identified as risk factors: gender [11.1% female vs. 3.6% male, OR 2.25 (1.07-4.73); p = 0.03], age [11.0% 31-50 years of age vs. 4.2% others, OR 2.21 (1.12-4.36); p = 0.02], previous history of PDPH [26.4% positive vs. 6.2% negative, OR 4.30 (1.99-9.31); p < 0.01] and bevel orientation [16.1% perpendicular vs. 5.7% parallel, OR 2.16 (1.07-4.35); p = 0.03]. The period of latency between lumbar puncture and headache onset range from 6 to 72 hours and the duration from 3 to 15 days. In 34/48 (71%) patients with PDPH, at least one of the following was present: neck stiffness, tinnitus, hypoacusia, photophobia, or nausea. CONCLUSION In conclusion, 14/48 patients (29%) suffered none of the above-mentioned symptoms, indicating that a significant number of patients may suffer from PDPH in the absence of any symptoms apart from the headache itself. This suggests that a further analyses of existing studies should be made to determine if a criteria change may need consideration.
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Effect of pregabalin on post-dural-puncture headache following spinal anesthesia and lumbar puncture. J Clin Neurosci 2011; 18:1365-8. [DOI: 10.1016/j.jocn.2011.02.029] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2010] [Revised: 01/27/2011] [Accepted: 02/05/2011] [Indexed: 11/24/2022]
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Basurto Ona X, Martínez García L, Solà I, Bonfill Cosp X. Drug therapy for treating post-dural puncture headache. Cochrane Database Syst Rev 2011:CD007887. [PMID: 21833962 DOI: 10.1002/14651858.cd007887.pub2] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND Post-dural puncture headache (PDPH) is the most common complication of lumbar puncture, an invasive procedure frequently performed in the emergency room. Numerous pharmaceutical drugs have been proposed to treat PDPH but there are still some uncertainties about their clinical effectiveness. OBJECTIVES To assess the effectiveness and safety of drugs for treating PDPH in adults and children. SEARCH STRATEGY The search strategy included the Cochrane Central Register of Controlled Trials (CENTRAL) in The Cochrane Library (2011, Issue 2), MEDLINE (from 1950 to June 2011), EMBASE (from 1980 to June 2011) and CINAHL (from 1982 to June 2011). There was no language restriction. SELECTION CRITERIA We considered randomised controlled trials (RCTs) assessing the effectiveness of any pharmacological drug used for treating PDPH. DATA COLLECTION AND ANALYSIS Review authors independently selected studies, assessed risks of bias and extracted data. We estimated risk ratios (RR) for dichotomous data and mean differences (MD) for continuous outcomes. We calculated a 95% confidence interval (CI) for each RR and MD. We did not undertake meta-analysis because the included studies assessed different sorts of drugs or different outcomes. We performed an intention-to-treat (ITT) analysis. MAIN RESULTS We included seven RCTs (200 participants) in this review (between 88% and 90.5% were women; mostly parturients (84% to 87%) after a lumbar puncture for a regional anaesthesia). Pharmacological drugs assessed were oral and intravenous caffeine, subcutaneous sumatriptan, oral gabapentin, oral theophylline, intravenous hydrocortisone and intramuscular adrenocorticotropic hormone (ACTH).One RCT reported data about PDPH persistence of any severity at follow up (primary outcome); caffeine reduced the number of participants with PDPH at one to two hours when compared to placebo. Treatment with caffeine also decreased the need for a conservative supplementary therapeutic option. Treatment with gabapentin versus placebo reported better visual analogue scale (VAS) scores after one, two, three and four days; treatment with hydrocortisone plus conventional treatment showed better VAS scores than conventional treatment alone at six, 24 and 48 hours and treatment with theophylline showed a lower mean "sum of pain" when compared with placebo. Sumatriptan and ACTH did not show any relevant effect for this outcome.There were no clinically significant drug adverse events.The rest of the outcomes were not reported by the RCTs or did not show any relevant effect. AUTHORS' CONCLUSIONS Caffeine has shown effectiveness for treating PDPH, decreasing the proportion of participants with PDPH persistence and those requiring supplementary interventions, when compared with placebo. Gabapentin, theophylline and hydrocortisone have also shown a decrease in pain severity scores when compared with placebo or conventional care.There is a lack of conclusive evidence for the other drugs assessed (sumatriptan and ACTH).These conclusions should be interpreted with caution, due to the lack of information to allow correct appraisal of risk of bias, the small sample sizes of studies and also the limited generalisability, as most participants were post-partum women in their 30s.
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Affiliation(s)
- Xavier Basurto Ona
- Emergency Department, Hospital de Figueres, Fundació Salut Empordà, Rda Rector Aroles s/n, Figueres, Girona-Catalunya, Spain, 17600
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Arévalo-Rodríguez I, Ciapponi A, Munoz L, Quintero RA, Bonfill Cosp X. Posture and fluids for preventing post-dural puncture headache. THE COCHRANE DATABASE OF SYSTEMATIC REVIEWS 2011. [DOI: 10.1002/14651858.cd009199] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Ergün U, Say B, Ozer G, Tunc T, Sen M, Tüfekcioglu S, Akin U, Ilhan MN, Inan L. Intravenous theophylline decreases post-dural puncture headaches. J Clin Neurosci 2008; 15:1102-4. [DOI: 10.1016/j.jocn.2007.11.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2007] [Revised: 10/22/2007] [Accepted: 11/06/2007] [Indexed: 10/21/2022]
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Amorim JA, Valença MM. Postdural Puncture Headache is a Risk Factor for New Postdural Puncture Headache. Cephalalgia 2007; 28:5-8. [DOI: 10.1111/j.1468-2982.2007.01454.x] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The aim of this study was to determine if patients with a previous history of postdural puncture headache (PDPH) might be prone to a new episode after spinal anaesthesia. Consecutive patients ( n = 258) who had had surgery under spinal anaesthesia were studied. Of 42 patients with a previous history of PDPH, eight (19.0±) developed a new PDPH episode; whereas out of 216 without a previous history of PDPH, only 15 (6.9±) presented with PDPH. Previous PDPH history indicates a higher chance of a new episode of PDPH after spinal anaesthesia. Women are more susceptible to such recurrences.
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Affiliation(s)
- JA Amorim
- Service of Neurology and Neurosurgery, Department of Neuropsychiatry, Federal University of Pernambuco
- Service of Anaesthesiology, Hospital da Restauração and Hospital Getülio Vargas, Recife, Brazil
| | - MM Valença
- Service of Neurology and Neurosurgery, Department of Neuropsychiatry, Federal University of Pernambuco
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Frank RL. Lumbar puncture and post-dural puncture headaches: implications for the emergency physician. J Emerg Med 2007; 35:149-57. [PMID: 17976786 DOI: 10.1016/j.jemermed.2007.03.024] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2005] [Revised: 05/25/2006] [Accepted: 10/02/2006] [Indexed: 10/22/2022]
Abstract
Lumbar puncture is a diagnostic procedure commonly performed by emergency physicians. Post-dural puncture headaches occur frequently after this procedure and can be associated with significant morbidity and, occasionally, even death. There is also a lot of variation in how post-dural puncture headaches are treated once they occur. This article seeks to examine the science behind post-dural puncture headaches, their prevention and treatment.
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Affiliation(s)
- Robert L Frank
- Department of Emergency Medicine, Mercy Hospital of Pittsburgh, University of Pittsburgh Affiliated Residency in Emergency Medicine, Pittsburgh, Pennsylvania 15219, USA
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Karci A, Boyaci F, Yaka E, Cakmur R, Men S, Elar Z. Cerebral venous thrombosis initially considered as a complication of spinal-epidural anaesthesia. J Int Med Res 2006; 33:711-4. [PMID: 16372591 DOI: 10.1177/147323000503300615] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Cerebral venous thrombosis is an unusual condition characterized by headache, nausea, vomiting, focal deficits and epileptic seizures. In this case report we describe a patient who presented with headache and focal motor deficits after an uneventful Caesarean section, performed using combined spinal-epidural anaesthesia. Magnetic resonance imaging was performed because of the pronounced neurological symptoms, and a diagnosis of cerebral venous thrombosis was made. The patient was treated with anticoagulant agents and made a complete recovery. This case emphasizes the importance of considering cerebral venous thrombosis in the differential diagnosis of headache in the post-partum period prior to instituting conventional therapy.
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Affiliation(s)
- A Karci
- Department of Anaesthesiology and Reanimation, Dokuz Eylül University Medical School, Izmir, Turkey.
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Ahmed SU, Martin NM, Chang Y. Patient Selection and Trial Methods for Intraspinal Drug Delivery for Chronic Pain: A National Survey. Neuromodulation 2005; 8:112-20. [DOI: 10.1111/j.1525-1403.2005.00227.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Reina MA, López A, Badorrey V, De Andrés JA, Martín S. Dura-arachnoid lesions produced by 22 gauge Quincke spinal needles during a lumbar puncture. J Neurol Neurosurg Psychiatry 2004; 75:893-7. [PMID: 15146008 PMCID: PMC1739051 DOI: 10.1136/jnnp.2003.017624] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
AIMS The dural and arachnoid hole caused by lumbar puncture needles is a determining factor in triggering headaches. The aim of this study is to assess the dimensions and morphological features of the dura mater and arachnoids when they are punctured by a 22 gauge Quincke needle having its bevel either in the parallel or in the transverse position. METHODS Fifty punctures were made with 22 gauge Quincke needles in the dural sac of four fresh cadavers using an "in vitro" model especially designed for this purpose. The punctures were performed by needles with bevels parallel or perpendicular to the spinal axis and studied under scanning electron microscopy. RESULTS Thirty five of the 50 punctures done by Quincke needles (19 in the external surface and 16 in the internal) were used for evaluation. When the needle was inserted with its bevel parallel to the axis of the dural sac (17 of 35), the size of the dura-arachnoid lesion was 0.032 mm(2) in the epidural surface and 0.037 mm(2) in the subarachnoid surface of the dural sac. When the needle's bevel was perpendicular to the axis (18 of 35) the measurement of the lesion size was 0.042 mm(2) for the external surface and 0.033 mm(2) for the internal. There were no statistical significant differences between these results. CONCLUSIONS It is believed that the reported lower frequency of postdural puncture headache when the needle is inserted parallel to the cord axis should be explained by some other factors besides the size of the dura-arachnoid injury.
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Affiliation(s)
- M A Reina
- Department of Anaesthesiology and Critical Care, Hospital de Móstoles, Madrid, Spain.
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