Inhaled Nitric Oxide Treatment for Aneurysmal SAH Patients With Intractable Cerebral Vasospasm

Cerebral Ischemia Clinical Trial

Official title:

Inhalative Stickstoffmonoxid (NO) Behandlung Bei Patienten Mit Schwerem, therapierefraktärem Zerebralen Vasospasmus Nach Subarachnoidalblutung

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT04988932
• Other study ID #: 019/10
• Status: Completed
• Phase: N/A
• Start date: July 31, 2012
• Est. completion date: March 20, 2020

Study information

• Verified date: July 2021
• Source: University Hospital Inselspital, Berne
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

Aneurysmal subarachnoid haemorrhage (aSAH) is a rare but severe subtype of stroke with high mortality and morbidity. Besides rebleeding, delayed cerebral ischaemia and cerebral vasospasm (CVS) are thought to be major reasons for the poor outcome in survivors of aSAH. Despite advances in the detection and treatment of CVS 20-40% of CVS patients experience cerebral Ischaemia. Experimental animal studies for ischaemic stroke, traumatic brain injury, and SAH showed that inhaled nitric oxide (iNO) selectively dilates cerebral arteries and arterioles in hypoperfused brain tissue. The investigators therefore performed this prospective pilot study to evaluate the effects of iNO on cerebral perfusion in patients with refractory vasospasm after aSAH.

Description:

Aneurysmal subarachnoid haemorrhage (aSAH) is a rare but severe subtype of stroke with high mortality and morbidity. Besides rebleeding, delayed cerebral ischaemia and cerebral vasospasm (CVS) are thought to be major reasons for the poor outcome in survivors of aSAH. CVS, thought to be caused by blood breakdown products, peak in the second week after hemorrhage and affect up 88% of patients with severe aSAH. Despite advances in the detection and treatment of CVS there is no established therapy and up 40% of patients experience cerebral ischemia. In symptomatic vasospasm and cerebral hypoperfusion various treatments like induced hypertension, angioplasty and intraarterial vasodilators are used as rescue therapies. Yet, their effect is not proven.

In recent experimental studies, inhaled nitric oxide (iNO) has been shown to induce a selective dilation of cerebral arteries and arterioles in hypoperfused brain tissue [8, 9]. After experimental SAH in mice, iNO significantly reduced the number and severity of SAH-induced spasms of cerebral microvessels, thereby improving cerebral perfusion. Inhaled NO has regulatory approval in man by the Food and Drug Administration (FDA) and by the European Medicines Agency (EMA) for the treatment of several pulmonary pathologies. At first the efficacy of iNO was thought to be limited to the lungs but, based on the results of the experimental studies the investigators hypothesised that iNO may relieve CVS and improve cerebral perfusion in patients with aSAH.

The investigators performed this prospective trial to evaluate the effect of iNO on cerebral perfusion in patients with severe refractory CVS. Only patients with refractory CVS after maximum conservative treatment were included. Inhaled NO was administered to a maximum dose of 40ppm. The effect was assessed by digital subtraction angiography (DSA), tissue oxygen partial pressure (PtiO2), transcranial Doppler (TCD), and CT perfusion (CTP) imaging. Patiente outcome is assessed at 12 weeks an 6 months after hemorrhage and included NIHSS, Mini Mental State (MMS) test, and modified Rankin Scale (mRS).

Recruitment information / eligibility

• Status: Completed
• Enrollment: 7
• Est. completion date: March 20, 2020
• Est. primary completion date: July 28, 2019
• Accepts healthy volunteers: No
• Gender: All
• Age group: 18 Years to 80 Years

Eligibility

Inclusion Criteria:

• aSAH of all severities

• Aneurysm treated by either surgical clipping or endovascular coiling

• Age between 18 - 80 years

• Proven CVS

• Cerebral hypoperfusion and neurological deficit despite treatment (oral nimodipine, induced hypertension, hypervolaemia, central venous pressure > 6 mmHg)

• A negative pregnancy test in women

• Signed informed consent from the next of kin and an independent physician

Exclusion Criteria:

• Unsecured aneurysm

• Cerebral infarction on imaging in the downstream brain parenchyma of spastic vessel

• Cerebral herniation

• Intracranial pressure > 25 mmHg

• Pregnancy

• Mean arterial pressure = 90 mmHg despite catecholamines

Related Conditions & MeSH terms

• Brain Ischemia
• Cerebral Infarction
• Cerebral Ischemia
• Inhaled Nitric Oxide
• Ischemia
• Respiratory Aspiration
• SAH
• Vasospasm

Intervention

Drug:
• Inhaled nitric oxide
Each increase of iNO dose is followed by a 10-minute monitoring period and a DSA examination. After reaching the highest effective dose of iNO or the maximum of 40 ppm another DSA is performed. iNO is going to be continued until normalisation of CVS or for a maximum period of 5 days. During iNO treatment a DSA will be performed every 24 hours, followed by a decrease of iNO to the next-lower level. If tapering the iNO concentration is associated with increasing vasospasm, iNO is going to be increased again to the last effective dosage. For cessation of iNO administration, dosage will be tapered every 30 minutes using the same dosage steps as for initiation of iNO treatment. If the duration of iNO treatment will be more than 32 hours, tapering intervals are prolonged to 4 hours. Cessation of iNO will be followed by a DSA.

Locations

Country	Name	City	State
Switzerland	Department of Neurosurgery, University Hospital Bern	Bern

Sponsors (1)

Lead Sponsor	Collaborator
University Hospital Inselspital, Berne

Country where clinical trial is conducted

Switzerland, 

References & Publications (6)

Germann P, Braschi A, Della Rocca G, Dinh-Xuan AT, Falke K, Frostell C, Gustafsson LE, Hervé P, Jolliet P, Kaisers U, Litvan H, Macrae DJ, Maggiorini M, Marczin N, Mueller B, Payen D, Ranucci M, Schranz D, Zimmermann R, Ullrich R. Inhaled nitric oxide therapy in adults: European expert recommendations. Intensive Care Med. 2005 Aug;31(8):1029-41. Epub 2005 Jun 23. — View Citation

Griffiths MJ, Evans TW. Inhaled nitric oxide therapy in adults. N Engl J Med. 2005 Dec 22;353(25):2683-95. Review. — View Citation

Terpolilli NA, Brem C, Bühler D, Plesnila N. Are We Barking Up the Wrong Vessels? Cerebral Microcirculation After Subarachnoid Hemorrhage. Stroke. 2015 Oct;46(10):3014-9. doi: 10.1161/STROKEAHA.115.006353. Epub 2015 Jul 7. Review. — View Citation

Terpolilli NA, Feiler S, Dienel A, Müller F, Heumos N, Friedrich B, Stover J, Thal S, Schöller K, Plesnila N. Nitric oxide inhalation reduces brain damage, prevents mortality, and improves neurological outcome after subarachnoid hemorrhage by resolving early pial microvasospasms. J Cereb Blood Flow Metab. 2016 Dec;36(12):2096-2107. Epub 2015 Nov 2. — View Citation

Terpolilli NA, Kim SW, Thal SC, Kataoka H, Zeisig V, Nitzsche B, Klaesner B, Zhu C, Schwarzmaier S, Meissner L, Mamrak U, Engel DC, Drzezga A, Patel RP, Blomgren K, Barthel H, Boltze J, Kuebler WM, Plesnila N. Inhalation of nitric oxide prevents ischemic brain damage in experimental stroke by selective dilatation of collateral arterioles. Circ Res. 2012 Mar 2;110(5):727-38. doi: 10.1161/CIRCRESAHA.111.253419. Epub 2011 Dec 29. — View Citation

Terpolilli NA, Kim SW, Thal SC, Kuebler WM, Plesnila N. Inhaled nitric oxide reduces secondary brain damage after traumatic brain injury in mice. J Cereb Blood Flow Metab. 2013 Feb;33(2):311-8. doi: 10.1038/jcbfm.2012.176. Epub 2012 Nov 28. — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Improvement of severe vasospasm in digital subtraction angiography	> 10% increase in diameter of the vasospastic target vessel compared to baseline	Up to 5 days
Primary	Improvement of severe vasospasm in tissue oxygen partial pressure (PtiO2)	An increase of more than 5 mmHg with constant fraction of inspired oxygen (FiO2)	Up to 5 days
Primary	Improvement of severe vasospasm in transcranial Doppler	A decrease of more than 30 cm/s	Up to 5 days
Primary	Improvement of severe vasospasm in CT perfusion	A reduction in the number of Region of interest with impaired perfusion (MTT > 6·5 s)	Day 2
Secondary	Intracranial pressure	Intracranial pressure using an external ventricular drain catheter	Up to 5 days
Secondary	Assessment of ischaemic events by CT Scan		12 weeks after SAH