Safety and effectiveness of the assessment and treatment of idiopathic normal pressure hydrocephalus in the Adult Hydrocephalus Clinical Research Network

Author:

Williams Michael A.1,Nagel Sean J.2,Golomb James3,Jensen Hailey4,Dasher Nickolas A.5,Holubkov Richard4,Edwards Richard J.6,Luciano Mark G.7,Zwimpfer Thomas J.8,Katzen Heather9,Moghekar Abhay10,Wisoff Jeffrey H.11,McKhann Guy M.12,Hamilton Mark G.13

Affiliation:

1. Departments of Neurology and Neurological Surgery, University of Washington School of Medicine, Seattle, Washington;

2. Department of Neurosurgery, Center for Neurological Restoration, Cleveland Clinic, Cleveland, Ohio;

3. Department of Neurology, New York University School of Medicine, New York, New York;

4. Department of Pediatrics, University of Utah, Salt Lake City, Utah;

5. Department of Rehabilitation Medicine, University of Washington School of Medicine, Seattle, Washington;

6. Department of Neurosurgery, Southmead Hospital, Bristol, United Kingdom;

7. Department of Neurosurgery, Johns Hopkins School of Medicine, Baltimore, Maryland;

8. Division of Neurosurgery, Department of Surgery, University of British Columbia, Vancouver, British Columbia, Canada;

9. Department of Neurology, University of Miami Miller School of Medicine, Miami, Florida;

10. Department of Neurology, Johns Hopkins School of Medicine, Baltimore, Maryland;

11. Division of Pediatric Neurosurgery, Hassenfeld Children’s Hospital at NYU Langone Health, New York, New York;

12. Department of Neurological Surgery, Columbia University School of Medicine, New York, New York; and

13. Department of Clinical Neurosciences, Division of Neurosurgery, University of Calgary School of Medicine, Calgary, Alberta, Canada

Abstract

OBJECTIVE The aim of this study was to describe the processes and outcomes associated with patients at five sites in the Adult Hydrocephalus Clinical Research Network (AHCRN) who had undergone evaluation and treatment for suspected idiopathic normal pressure hydrocephalus (iNPH) and had 1-year postoperative follow-up. METHODS Subjects with possible iNPH who had been prospectively enrolled in the AHCRN registry between November 19, 2014, and December 31, 2018, were evaluated by CSF drainage via either lumbar puncture or external lumbar drainage, consistent with recommendations of the international iNPH guidelines. Standardized clinical evaluations of gait, cognition, urinary symptoms, depression, and functional outcomes were conducted at baseline, before and after CSF drainage, and at 4-month intervals after shunt surgery. Complications of CSF drainage and shunt surgery were recorded. RESULTS Seventy-four percent (424/570) of patients with possible iNPH had CSF drainage, and 46% of them (193/424) underwent shunt surgery. The mean change in gait velocity with CSF drainage was 0.18 m/sec in patients who underwent shunt surgery versus 0.08 m/sec in patients who did not. For shunt surgery patients, gait velocity increased by 54% from 0.67 m/sec before CSF drainage to 0.96 m/sec 8–12 months after surgery, and 80% of patients had an increase of at least 0.1 m/sec by the first postoperative visit. Evaluation of cognition, urinary symptoms, depression, and functional outcomes also revealed improvement after shunt surgery. Of 193 patients who had undergone shunt surgery, 176 (91%) had no complications and 17 (9%) had 28 complications. Eleven patients (6%) had 14 serious complications that resulted in the need for surgery or an extended hospital stay. The 30-day reoperation rate was 3%. CONCLUSIONS Using criteria recommended by the international iNPH guidelines, the authors found that evaluation and treatment of iNPH are safe and effective. Testing with CSF drainage and treatment with shunt surgery are associated with a high rate of sustained improvement and a low rate of complications for iNPH in the 1st year after shunt surgery. Patients who had undergone shunt surgery for iNPH experienced improvement in gait, cognitive function, bladder symptoms, depression, and functional outcome measures. Gait velocity, which is an easily measured, objective, continuous variable, should be used as a standard outcome measure to test a patient’s response to CSF drainage and shunt surgery in iNPH.

Publisher

Journal of Neurosurgery Publishing Group (JNSPG)

Subject

Genetics,Animal Science and Zoology

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