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Nanayakkara B, McNamara S. Pathophysiology of Chronic Hypercapnic Respiratory Failure. Sleep Med Clin 2024; 19:379-389. [PMID: 39095137 DOI: 10.1016/j.jsmc.2024.04.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/04/2024]
Abstract
Chronic hypercapnic respiratory failure occurs in several conditions associated with hypoventilation. The mechanisms underlying the development of chronic hypercapnia include a combination of processes that increase metabolic CO2 production, reduce minute ventilation (V'e), or increase dead space fraction (Vd/Vt). Fundamental to the pathophysiology is a mismatch between increased load and a reduction in the capacity of the respiratory pump to compensate. Though neural respiratory drive may be decreased in a subset of central hypoventilation disorders, it is more commonly increased in attempting to maintain the load-capacity homeostatic balance.
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Affiliation(s)
- Budhima Nanayakkara
- Charles Sturt University, 346 Leeds Parade, Orange, NSW 2800, Australia; Department of Medicine, Orange Health Service, Orange, NSW 2800, Australia; University of Sydney, Camperdown, NSW 2006, Australia.
| | - Stephen McNamara
- Department of Respiratory & Sleep Medicine, Royal Prince Alfred Hospital, Camperdown, NSW 2050, Australia
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Tocan V, Nakamura-Utsunomiya A, Sonoda Y, Matsuoka W, Mizuguchi S, Muto Y, Hijioka T, Nogami M, Sasaoka D, Nagamatsu F, Oba U, Kawakubo N, Hamada H, Mushimoto Y, Chong PF, Kaku N, Koga Y, Sakai Y, Oda Y, Tajiri T, Ohga S. High-Titer Anti-ZSCAN1 Antibodies in a Toddler Clinically Diagnosed with Apparent Rapid-Onset Obesity with Hypothalamic Dysfunction, Hypoventilation, and Autonomic Dysregulation Syndrome. Int J Mol Sci 2024; 25:2820. [PMID: 38474067 DOI: 10.3390/ijms25052820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 02/24/2024] [Accepted: 02/25/2024] [Indexed: 03/14/2024] Open
Abstract
Severe obesity in young children prompts for a differential diagnosis that includes syndromic conditions. Rapid-Onset Obesity with Hypothalamic Dysfunction, Hypoventilation, and Autonomic Dysregulation (ROHHAD) syndrome is a potentially fatal disorder characterized by rapid-onset obesity associated with hypoventilation, neural crest tumors, and endocrine and behavioral abnormalities. The etiology of ROHHAD syndrome remains to be established, but recent research has been focusing on autoimmunity. We report on a 2-year-old girl with rapid-onset obesity during the first year of life who progressed to hypoventilation and encephalitis in less than four months since the start of accelerated weight gain. The patient had a high titer of anti-ZSCAN1 antibodies (348; reference range < 40), and the increased values did not decline after acute phase treatment. Other encephalitis-related antibodies, such as the anti-NDMA antibody, were not detected. The rapid progression from obesity onset to central hypoventilation with encephalitis warns about the severe consequences of early-onset ROHHAD syndrome. These data indicate that serial measurements of anti-ZSCAN1 antibodies might be useful for the diagnosis and estimation of disease severity. Further research is needed to determine whether it can predict the clinical course of ROHHAD syndrome and whether there is any difference in antibody production between patients with and without tumors.
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Affiliation(s)
- Vlad Tocan
- Department of Pediatrics, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Akari Nakamura-Utsunomiya
- Department of Genetic Medicine/Pediatrics, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima 734-8511, Japan
- Department of Pediatrics, Hiroshima City North Medical Center Asa Citizens Hospital, Hiroshima 731-0293, Japan
- Division of Neonatal Screening, National Center for Child Health and Development, Tokyo 157-8535, Japan
| | - Yuri Sonoda
- Department of Pediatrics, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Wakato Matsuoka
- Department of Pediatrics, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
- Emergency and Critical Care Center, Kyushu University Hospital, Fukuoka 812-8582, Japan
| | - Soichi Mizuguchi
- Department of Pediatrics, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
- Emergency and Critical Care Center, Kyushu University Hospital, Fukuoka 812-8582, Japan
| | - Yuichiro Muto
- Department of Pediatrics, Japanese Red Cross Kumamoto Hospital, Kumamoto 861-8520, Japan
| | - Takaaki Hijioka
- Department of Pediatrics, Japanese Red Cross Kumamoto Hospital, Kumamoto 861-8520, Japan
- Department of Pediatrics, Graduate School of Medical Sciences, Kumamoto University, Kumamoto 860-8556, Japan
| | - Masao Nogami
- Department of Pediatrics, Japanese Red Cross Kumamoto Hospital, Kumamoto 861-8520, Japan
| | - Daiki Sasaoka
- Department of Pediatrics, Graduate School of Medical Sciences, Kumamoto University, Kumamoto 860-8556, Japan
| | - Fusa Nagamatsu
- Department of Pediatrics, Graduate School of Medical Sciences, Kumamoto University, Kumamoto 860-8556, Japan
| | - Utako Oba
- Department of Pediatrics, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Naonori Kawakubo
- Department of Pediatric Surgery, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Hiroshi Hamada
- Department of Pediatric Surgery, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
- Department of Anatomic Pathology, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Yuichi Mushimoto
- Department of Pediatrics, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Pin Fee Chong
- Department of Pediatrics, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Noriyuki Kaku
- Department of Pediatrics, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
- Emergency and Critical Care Center, Kyushu University Hospital, Fukuoka 812-8582, Japan
| | - Yuhki Koga
- Department of Pediatrics, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Yasunari Sakai
- Department of Pediatrics, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Yoshinao Oda
- Department of Anatomic Pathology, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Tatsuro Tajiri
- Department of Pediatric Surgery, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Shouichi Ohga
- Department of Pediatrics, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
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Villagrán-García M, Farina A, Campetella L, Arzalluz-Luque J, Honnorat J. Autonomic nervous system involvement in autoimmune encephalitis and paraneoplastic neurological syndromes. Rev Neurol (Paris) 2024; 180:107-116. [PMID: 38142198 DOI: 10.1016/j.neurol.2023.12.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Revised: 12/07/2023] [Accepted: 12/12/2023] [Indexed: 12/25/2023]
Abstract
In autoimmune neurological diseases, the autonomic nervous system can be the primary target of autoimmunity (e.g. autoimmune autonomic ganglionopathy), or, more frequently, be damaged together with other areas of the nervous system (e.g. Guillain-Barré syndrome). Patients with autoimmune encephalitis and paraneoplastic neurological syndromes (PNS) often develop dysautonomia; however, the frequency and spectrum of autonomic signs and symptoms remain ill defined except for those scenarios in which dysautonomia is a core feature of the disease. Such is the case of Lambert-Eaton myasthenic syndrome, Morvan syndrome or anti-NMDAR encephalitis; in the latter, patients with dysautonomia have been reported to carry a more severe disease and to retain higher disability than those without autonomic dysfunction. Likewise, the presence of autonomic involvement indicates a higher risk of death due to neurological cause in patients with anti-Hu PNS. However, in anti-Hu and other PNS, as well as in the context of immune checkpoint inhibitors' toxicities, the characterization of autonomic involvement is frequently overshadowed by the severity of other neurological symptoms and signs. When evaluated with tests specific for autonomic function, patients with autoimmune encephalitis or PNS usually show a more widespread autonomic involvement than clinically suggested, which may reflect a potential gap of care when it comes to diagnosing dysautonomia. This review aims to revise the autonomic involvement in patients with autoimmune encephalitis and PNS, using for that purpose an antibody-based approach. We also discuss and provide general recommendations for the evaluation and management of dysautonomia in these patients.
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Affiliation(s)
- M Villagrán-García
- French Reference Centre on Paraneoplastic Neurological Syndromes and Autoimmune Encephalitis, Hospices Civils de Lyon, hôpital neurologique, Bron, France; Inserm U1314, MeLiS-UCBL-CNRS UMR 5284, University Claude-Bernard Lyon 1, Lyon, France
| | - A Farina
- French Reference Centre on Paraneoplastic Neurological Syndromes and Autoimmune Encephalitis, Hospices Civils de Lyon, hôpital neurologique, Bron, France; Inserm U1314, MeLiS-UCBL-CNRS UMR 5284, University Claude-Bernard Lyon 1, Lyon, France; Department of Neuroscience, Psychology, Pharmacology and Child Health, University of Florence, Florence, Italy
| | - L Campetella
- French Reference Centre on Paraneoplastic Neurological Syndromes and Autoimmune Encephalitis, Hospices Civils de Lyon, hôpital neurologique, Bron, France; Inserm U1314, MeLiS-UCBL-CNRS UMR 5284, University Claude-Bernard Lyon 1, Lyon, France
| | - J Arzalluz-Luque
- French Reference Centre on Paraneoplastic Neurological Syndromes and Autoimmune Encephalitis, Hospices Civils de Lyon, hôpital neurologique, Bron, France; Department of Neurology, Hospital Universitario Virgen Macarena, Sevilla, Spain
| | - J Honnorat
- French Reference Centre on Paraneoplastic Neurological Syndromes and Autoimmune Encephalitis, Hospices Civils de Lyon, hôpital neurologique, Bron, France; Inserm U1314, MeLiS-UCBL-CNRS UMR 5284, University Claude-Bernard Lyon 1, Lyon, France.
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