Aortic StenosisNCT01319799
Microembolic Signals and Cerebrospinal Fluid Markers of Neuronal Damage After Surgical Aortic Valve Replacement
An observational study of Aortic Stenosis, run by Sahlgrenska University Hospital at 1 site in Sweden.
Trial summary
The use of MRI have shown that the incidence of postoperative cerebral lesions due to cerebral embolization is high (1). Nonetheless the extent of postoperative neurological dysfunction is only a fraction of the actual amount of new postoperative changes detected on MRI. Read more about this study
- Who is it for?
- Any age
- Conditions the study is for
- Aortic Stenosis
- What is being tested?
- Open heart surgery
- How many people
- 10 participants
- Where
- 1 siteSweden
- Study dates
- Nov 2010to Jun 2011
- Phase
- Observational
- Are there results?
- Yes, posted in the registrySummary in the doctors' view
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages Any age
- All sexes
- No healthy volunteers
- Child, Adult, Older adult
Study population: Elective surgical aortic valve replacement
Who may be able to join
- Clinical diagnosis aortic stenosis eligible for surgical treatment
Who cannot join
- Coagulopathy
- Regular Anticoagulation therapy
- Carotid stenosis
Trial locations and contacts
1 site in 1 country.
Sweden1 site
Department of Thoracic Anaesthesia & Intensive Care,Sahlgrenska University Hospital
Gothenburg, 41345
About this study
Official title: Microembolic Signals and Cerebrospinal Fluid Markers of Neuronal Damage After Surgical Aortic Valve
The use of MRI have shown that the incidence of postoperative cerebral lesions due to cerebral embolization is high (1). Nonetheless the extent of postoperative neurological dysfunction is only a fraction of the actual amount of new postoperative changes detected on MRI. Transcranial Doppler (TCD) has shown the occurrence of extensive microembolic signals in intracerebral arteries during open heart procedures (2). The clinical significance of cerebral microemboli is not clear (3-5). The use of serological markers to assess cerebral injury after open cardiac surgery is difficult to interpret. The levels of markers seems to be contaminated from extracerebral sources (6). In order assess the release of markers of neuronal damage after open aortic valve surgery the investigators intend to examine the levels of S-100B, NSE and Tau in cerebrospinal fluid (CSF) by comparing the levels preoperative with the levels one day after surgery. Furthermore the investigators will determine the total amount of cerebral microembolic signals during the surgical procedure by means of TCD. The investigators will statistically test if there is any correlation between the increase in cerebrospinal fluid levels of S-100B,NSE and Tau and the cerebral embolic load.
Read the detailed description
Patients and clinical procedures 10 patients scheduled for open aortic valve surgery at our institution will be included into this prospective, observational study. The Human Ethics Committee of the University of Gothenburg, approved the study protocol. The day before surgery a lumbar puncture at level L3-4 will be performed using a 27G Whitacre needle. A sample of 2.5 ml of cerebrospinal fluid will be taken for analysis of S-100B, NSE, Tau and albumin.
On arrival at OR, standard perioperative monitoring will be established, including an Auditory Evoked Potential (AEP) monitor for anaesthetic depth measurements (AEP Monitor/2, Danmeter, Odense, Denmark) and radial arterial and central venous lines. General anaesthesia is induced with propofol 0.5-1 mg/kg and fentanyl 10 μg/kg. Tracheal intubation will be facilitated using atracurium 0,5 mg/kg. Sevoflurane is used to maintain an anaesthetic depth adjusted to an AAI index of 15-30 as recorded by the AEP monitor. Hemodynamic stability will be obtained by the use of colloidal solution administration, guided by the use of intra-operative transesophageal echocardiography, and norephineprine to maintain a mean arterial pressure above 75 mmHg-Also during CPB. A lumbar puncture will be repeated the first postoperative day repeating the measurement of markers in CSF A certified cardiologist or anaesthesiologist assess focal neurological impairment before and within 24 hours after the procedure.
Transcranial Doppler (TCD) By TCD the right medial cerebral artery (RMCA) will be insonated by the transtemporal approach at a depth of approximately 50 mm using standard criteria. The investigators use a 2 MHz power M-mode TCD monitor (ST3 ©, Spencer Technologies Seattle, WA), with the probe fixed in position using a head frame. The Doppler signals will be continuously monitored and saved to monitor hard drive. Two physicians independently evaluate the TCD data files offline, and identify microembolic signals (MES) using criteria for counting emboli signals on spectral and PMD TCD.
Statistical Analysis: Descriptive statistics and tests of normality for continuos data Correlation analysis; Total cerebral embolic load vs. increase of CSF level S-100B/ NSE/Tau.
- Conditions
- Aortic Stenosis
- Being tested
- Open heart surgery
- Keywords
- Embolism, Nervous system, Aorta, Valves, Ultrasonics
- Medical subject headings
- Aortic Valve Stenosis, Embolism, Neurologic Manifestations
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Open heart surgeryOther
TCD count of microembolic signals during surgical aortic valve replacement
| Study group | Role | What they receive |
|---|---|---|
| Surgical aortic valve replacement | Single observational study. Count of microembolic signals during open heart surgery and measurement of properative vs postoperative levels of markers in cerebrospinal fluid of neuronal damge. Receives: Other: Open heart surgery |
What is being measured
The primary outcome is the main question the study is designed to answer.
Transcranial Doppler(TCD) Microembolic Signals During Surgical Aortic Valve Replacement Surgery
Transcranial Doppler measurement of microembolic signals will be measured during the surgical procedure.Microembolic signals are detected by offline analysis of the Dopplerspectral analysis of the blood flow in the medial cerebral artery. Different intensities (dB),flow direction and time frame appearances in the Doppler spectral envelope is distinguishable for a neurosonolgist according to predefined criteria for an embolic signal-defined in previous litterature.The total amount of signals during one surgical procedure is counted. The appearance of microembolic signals related to specific procedures performed during cardiac surgery with cardiopulmonary bypass is noted. The exact time range is not possible to estimate in advance,due to the fact that each surgical procedure varies in time.The range of values for each individual patient, based on pilos, will vary from 50 to approximately 1500 embolic counts for one surgical procedure. A high value is negative for the patient.
Measured: (day 1) TCD will be performed from start of surgery till end of surgery-exact time cannot be stated in advance
Secondary outcomes (1)
Cerebrospinal Fluid(CSF) Levels of S-100B(Microgram/Liter)
Differences in preoperative vs postoperative CSF levels of S-100B in microgram/Liter
The assumption is that a cardiac open heart surgical procedure with cardiopulmonary bypass will influence the postoperative level of marker of neuronal cell damage in the central nerve system. An increase in the levels, compared to the preoperative values, indicates neuronal cell damage detectable in the CSF, namely the brains own extracellular fluid.
Measured: 24 Hours after Surgery
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted22 Mar 2011 (estimated)
- Study startNov 2010
- Primary completionJun 2011
- Study completionJun 2011
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Posted resultsParticipant flow, outcome measures and adverse events reported by the sponsor.
- Publications (6)Papers the sponsor has linked to this study.
- Other trials for Aortic StenosisStudies of the same condition, open and under way.
- More trials run by Sahlgrenska University HospitalThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Case only
- Time perspective
- Prospective
- Enrolment
- 10 participants (actual)
Sponsor and investigators
- Lead sponsor
- Sahlgrenska University Hospital
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Bjorn Reinsfelt, Sahlgrenska University Hospital
- Investigators
- Sven Erik Ricksten, Professor, Study director, Sahlgrenska University Hospital,Thoracic Anesthesia & Intensive Care
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT01319799
- Sponsor's protocol ID
- Dnr112-09
- Status last verified
- Feb 2017
- First submitted
- 21 Mar 2011
- Last updated
- 29 Mar 2017
- Results posted
- Yes, on ClinicalTrials.gov
- Data monitoring committee
- No
- Individual data sharing
- No
Publications
Stolz E, Gerriets T, Kluge A, Klovekorn WP, Kaps M, Bachmann G. Diffusion-weighted magnetic resonance imaging and neurobiochemical markers after aortic valve replacement: implications for future neuroprotective trials? Stroke. 2004 Apr;35(4):888-92. doi: 10.1161/01.STR.0000120306.82787.5A. Epub 2004 Feb 19.
PubMed 14976326Abu-Omar Y, Balacumaraswami L, Pigott DW, Matthews PM, Taggart DP. Solid and gaseous cerebral microembolization during off-pump, on-pump, and open cardiac surgery procedures. J Thorac Cardiovasc Surg. 2004 Jun;127(6):1759-65. doi: 10.1016/j.jtcvs.2003.09.048.
PubMed 15173734Kruis RW, Vlasveld FA, Van Dijk D. The (un)importance of cerebral microemboli. Semin Cardiothorac Vasc Anesth. 2010 Jun;14(2):111-8. doi: 10.1177/1089253210370903.
PubMed 20478951van Dijk D, Kalkman CJ. Why are cerebral microemboli not associated with cognitive decline? Anesth Analg. 2009 Oct;109(4):1006-8. doi: 10.1213/ANE.0b013e3181b5af06. No abstract available.
PubMed 19762723Martin KK, Wigginton JB, Babikian VL, Pochay VE, Crittenden MD, Rudolph JL. Intraoperative cerebral high-intensity transient signals and postoperative cognitive function: a systematic review. Am J Surg. 2009 Jan;197(1):55-63. doi: 10.1016/j.amjsurg.2007.12.060. Epub 2008 Aug 23.
PubMed 18723157Anderson RE, Hansson LO, Nilsson O, Liska J, Settergren G, Vaage J. Increase in serum S100A1-B and S100BB during cardiac surgery arises from extracerebral sources. Ann Thorac Surg. 2001 May;71(5):1512-7. doi: 10.1016/s0003-4975(01)02399-2.
PubMed 11383792
Study at a glance
From the registry record, last updated by the sponsor on 29 Mar 2017. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Microembolic Signals and Cerebrospinal Fluid Markers of Neuronal Damage After Surgical Aortic Valve
- ClinicalTrials.gov ID
- NCT01319799
- Acronym / sponsor ID
- Dnr112-09
- Conditions
- Aortic Stenosis
- Keywords
- Embolism, Nervous system, Aorta, Valves, Ultrasonics
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 10 participants (actual)
- Lead sponsor
- Sahlgrenska University HospitalUniversity, hospital or other
- Study start
- Nov 2010
- Primary completion
- Jun 2011 (actual)
- Study completion
- Jun 2011 (actual)
- First posted
- 22 Mar 2011 (estimated)
- Results
- Posted 29 Mar 2017
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The use of MRI have shown that the incidence of postoperative cerebral lesions due to cerebral embolization is high (1). Nonetheless the extent of postoperative neurological dysfunction is only a fraction of the actual amount of new postoperative changes detected on MRI. Transcranial Doppler (TCD) has shown the occurrence of extensive microembolic signals in intracerebral arteries during open heart procedures (2). The clinical significance of cerebral microemboli is not clear (3-5). The use of serological markers to assess cerebral injury after open cardiac surgery is difficult to interpret. The levels of markers seems to be contaminated from extracerebral sources (6). In order assess the release of markers of neuronal damage after open aortic valve surgery the investigators intend to examine the levels of S-100B, NSE and Tau in cerebrospinal fluid (CSF) by comparing the levels preoperative with the levels one day after surgery. Furthermore the investigators will determine the total amount of cerebral microembolic signals during the surgical procedure by means of TCD. The investigators will statistically test if there is any correlation between the increase in cerebrospinal fluid levels of S-100B,NSE and Tau and the cerebral embolic load.
Detailed description
Patients and clinical procedures 10 patients scheduled for open aortic valve surgery at our institution will be included into this prospective, observational study. The Human Ethics Committee of the University of Gothenburg, approved the study protocol. The day before surgery a lumbar puncture at level L3-4 will be performed using a 27G Whitacre needle. A sample of 2.5 ml of cerebrospinal fluid will be taken for analysis of S-100B, NSE, Tau and albumin.
On arrival at OR, standard perioperative monitoring will be established, including an Auditory Evoked Potential (AEP) monitor for anaesthetic depth measurements (AEP Monitor/2, Danmeter, Odense, Denmark) and radial arterial and central venous lines. General anaesthesia is induced with propofol 0.5-1 mg/kg and fentanyl 10 μg/kg. Tracheal intubation will be facilitated using atracurium 0,5 mg/kg. Sevoflurane is used to maintain an anaesthetic depth adjusted to an AAI index of 15-30 as recorded by the AEP monitor. Hemodynamic stability will be obtained by the use of colloidal solution administration, guided by the use of intra-operative transesophageal echocardiography, and norephineprine to maintain a mean arterial pressure above 75 mmHg-Also during CPB. A lumbar puncture will be repeated the first postoperative day repeating the measurement of markers in CSF A certified cardiologist or anaesthesiologist assess focal neurological impairment before and within 24 hours after the procedure.
Transcranial Doppler (TCD) By TCD the right medial cerebral artery (RMCA) will be insonated by the transtemporal approach at a depth of approximately 50 mm using standard criteria. The investigators use a 2 MHz power M-mode TCD monitor (ST3 ©, Spencer Technologies Seattle, WA), with the probe fixed in position using a head frame. The Doppler signals will be continuously monitored and saved to monitor hard drive. Two physicians independently evaluate the TCD data files offline, and identify microembolic signals (MES) using criteria for counting emboli signals on spectral and PMD TCD.
Statistical Analysis: Descriptive statistics and tests of normality for continuos data Correlation analysis; Total cerebral embolic load vs. increase of CSF level S-100B/ NSE/Tau.
Study design
- Observational model
- Case only
- Time perspective
- Prospective
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| Surgical aortic valve replacement | – | Other: Open heart surgerySingle observational study. Count of microembolic signals during open heart surgery and measurement of properative vs postoperative levels of markers in cerebrospinal fluid of neuronal damge. |
Who may qualify
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Child, Adult, Older adult
- Study population
- Elective surgical aortic valve replacement
Key inclusion criteria (1 listed)
- Clinical diagnosis aortic stenosis eligible for surgical treatment
Key exclusion criteria (3 listed)
- Coagulopathy
- Regular Anticoagulation therapy
- Carotid stenosis
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Open heart surgeryTCD count of microembolic signals during surgical aortic valve replacement | Other | Surgical aortic valve replacement |
Primary outcome
Transcranial Doppler(TCD) Microembolic Signals During Surgical Aortic Valve Replacement Surgery
Time frame: (day 1) TCD will be performed from start of surgery till end of surgery-exact time cannot be stated in advance
Transcranial Doppler measurement of microembolic signals will be measured during the surgical procedure.Microembolic signals are detected by offline analysis of the Dopplerspectral analysis of the blood flow in the medial cerebral artery. Different intensities (dB),flow direction and time frame appearances in the Doppler spectral envelope is distinguishable for a neurosonolgist according to predefined criteria for an embolic signal-defined in previous litterature.The total amount of signals during one surgical procedure is counted. The appearance of microembolic signals related to specific procedures performed during cardiac surgery with cardiopulmonary bypass is noted. The exact time range is not possible to estimate in advance,due to the fact that each surgical procedure varies in time.The range of values for each individual patient, based on pilos, will vary from 50 to approximately 1500 embolic counts for one surgical procedure. A high value is negative for the patient.
1 secondary outcome
Cerebrospinal Fluid(CSF) Levels of S-100B(Microgram/Liter)
Time frame: 24 Hours after Surgery
Results and safety
Loading the posted results from ClinicalTrials.gov…
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 29 Mar 2017.
- Posted resultsParticipant flow, baseline, all outcome measures and adverse events.
- Background: PubMed 14976326Stolz E, Gerriets T, Kluge A, Klovekorn WP, Kaps M, Bachmann G. Diffusion-weighted magnetic resonance imaging and neurobiochemical markers after aortic valve replacement: implications for future neuroprotective trials? Stroke. 2004 Apr;35(4):888-92. doi: 10.1161/01.STR.0000120306.82787.5A. Epub 2004 Feb 19.
- Background: PubMed 15173734Abu-Omar Y, Balacumaraswami L, Pigott DW, Matthews PM, Taggart DP. Solid and gaseous cerebral microembolization during off-pump, on-pump, and open cardiac surgery procedures. J Thorac Cardiovasc Surg. 2004 Jun;127(6):1759-65. doi: 10.1016/j.jtcvs.2003.09.048.
- Background: PubMed 20478951Kruis RW, Vlasveld FA, Van Dijk D. The (un)importance of cerebral microemboli. Semin Cardiothorac Vasc Anesth. 2010 Jun;14(2):111-8. doi: 10.1177/1089253210370903.
- Background: PubMed 19762723van Dijk D, Kalkman CJ. Why are cerebral microemboli not associated with cognitive decline? Anesth Analg. 2009 Oct;109(4):1006-8. doi: 10.1213/ANE.0b013e3181b5af06. No abstract available.
- Background: PubMed 18723157Martin KK, Wigginton JB, Babikian VL, Pochay VE, Crittenden MD, Rudolph JL. Intraoperative cerebral high-intensity transient signals and postoperative cognitive function: a systematic review. Am J Surg. 2009 Jan;197(1):55-63. doi: 10.1016/j.amjsurg.2007.12.060. Epub 2008 Aug 23.
- Background: PubMed 11383792Anderson RE, Hansson LO, Nilsson O, Liska J, Settergren G, Vaage J. Increase in serum S100A1-B and S100BB during cardiac surgery arises from extracerebral sources. Ann Thorac Surg. 2001 May;71(5):1512-7. doi: 10.1016/s0003-4975(01)02399-2.
- Individual participant dataSharing planned: No
Related trials for Aortic Stenosis
Recruiting
Trial of the F2 Filter and Delivery System for Embolic Protection During TAVR
Aortic Stenosis Treated With TAVI, Aortic Diseases
Not yet recruiting
Human Experimental Models of Pain (HEMP)
Acute Pain
Active, not recruitingObservational study
Intravascular Lithotripsy in High Risk Calcified Iliac Anatomy for Transfemoral TAVR
Iliac Disease, Aortic Valve Stenosis
Not yet recruiting
NHLBI SESAME (SEptal Scoring Along Midline Endocardium) Multi-Center Prospective Study Using Improvised Off-Label Devices
Hypertrophic Cardiomyopathy, Left Ventricular Outflow Obstruction
Recruiting
Exercise and Diet Supplements for Older Patients Undergoing TAVI: the IRON-TAVI Trial
Aortic Stenosis Disease, Aortic Stenosis Symptomatic
Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Sven Erik Ricksten, Professor study director
Sahlgrenska University Hospital,Thoracic Anesthesia & Intensive Care
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Aortic Stenosis, run by Sahlgrenska University Hospital at 1 site in Sweden.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 1 inclusion and 3 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 29 Mar 2017. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Sweden. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
Yes. Results are posted in the registry (first posted 29 Mar 2017). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Transcranial Doppler(TCD) Microembolic Signals During Surgical Aortic Valve Replacement Surgery (time frame: (day 1) TCD will be performed from start of surgery till end of surgery-exact time cannot be stated in advance). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT01319799, which also lists 6 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 29 Mar 2017.