REVIEW PAPER
Figure from article: Therapeutic hypothermia as...
 
KEYWORDS
TOPICS
ABSTRACT
Introduction and objective:
Hypoxic-ischemic encephalopathy is one of the main types of neonatal encephalopathy in which perinatal asphyxia has been proven. The incidence of neonatal hypoxic-ischemic encephalopathy is estimated at 1–8 per 1,000 newborns and is associated with a variety of long-term complications. The study presents standard and novel treatment pathways and their limitations.

Review methods:
A literature search was performed in the PubMed and Google Scholar databases using the following phrases ‘hypoxic-ischemic encephalopathy’, ‘therapeutic hypothermia’, and ‘novel treatment’. The research studies used in the review were published between 2019 – 2025.

Brief description of the state of knowledge:
A thorough understanding of the pathogenesis of hypoxic-ischemic encephalopathy and neuroplastic features of the neonatal brain has allowed for the singling-out of therapeutic hypothermia as a standard procedure making it possible to significantly reduce mortality and improve the quality of life. However, the condition affects low-income countries even more frequently and, despite treatment, there is a 22% of severe complications or death. Current research focuses on new treatments options like therapeutic hypothermia modifications, such as selective head cooling, whole-body cooling, as well as pharmacotherapy with erythropoietin, stem cells, allopurinol, caffeine, melatonin, endocannabinoids, colony stimulating factors, metformin and more.

Summary:
Numerous limitations of therapeutic hypothermia necessitate further investigation. Another promising strategy may be a modification of therapeutic hypothermia and combination therapy.
REFERENCES (51)
1.
Lee BL, Glass HC. Cognitive outcomes in late childhood and adolescence of neonatal hypoxicischemic encephalopathy. Clin Exp Pediatr. 2021 Dec;64(12):608–618. https://doi.org/10.3345/cep.20....
 
2.
Sakr M, Shah M, Balasundaram P. Neonatal Therapeutic Hypothermia. In: StatPearls. https://www.ncbi.nlm.nih.gov/s... (access: 2025.01.21).
 
3.
Rasineni GK, Panigrahy N, Rath SN, et al. Diagnostic and Therapeutic Roles of the “Omics” in Hypoxic-Ischemic Encephalopathy in Neonates. Bioeng-BASEL. 2022 Oct;9(10). https://doi.org/10.3390/bioeng....
 
4.
El-Atawi KM, Osman MF, Hassan M, et al. Predictive Utility of Near-Infrared Spectroscopy for the Outcomes of Hypoxic-Ischemic Encephalopathy: A Systematic Review and Meta-Analysis. Cureus. 2023 Dec 27;15(12):e51162. https://doi.org/10.7759/cureus....
 
5.
Kleuskens DG, Gonçalves Costa F, Annink KV, et al. Pathophysiology of Cerebral Hyperperfusion in Term Neonates With Hypoxic-Ischemic Encephalopathy: A Systematic Review for Future Research. Front Pediatr. 2021;9:631258. https://doi.org/10.3389/fped.2....
 
6.
Starodubtseva NL, Eldarov C, Kirtbaya AR, et al. Recent Advances in diagnostic of neonatal hypoxic ischemic encephalopathy. Bull Russ State Med Univ. 2022 Aug;(4):5–16. https://doi.org/10.24075/brsmu...
 
7.
Pedroza-García KA, Calderón-Vallejo D, Quintanar JL. Neonatal Hypoxic-Ischemic Encephalopathy: Perspectives of Neuroprotective and Neuroregenerative Treatments. Neuropediatrics. 2022 Dec;53(6):402–417. https://doi.org/10.1055/s-0042....
 
8.
Abusaleem MY, Ebrahim MEE, Hamed NF, et al. A Systematic Review of the Relationship Between Neonatal Hypoxic-Ischemic Encephalopathy and Long-Term Cognitive Outcomes: Where Do We Stand? Cureus. 2024 Aug 30;16(8):e68227. https://doi.org/10.7759/cureus....
 
9.
Abate BB, Bimerew M, Gebremichael B, et al. Effects of therapeutic hypothermia on death among asphyxiated neonates with hypoxicischemic encephalopathy: A systematic review and meta-analysis of randomized control trials. PloS One. 2021;16(2):e0247229. https://doi.org/10.1371/journa....
 
10.
Frajewicki A, Laštůvka Z, Borbélyová V, et al. Perinatal hypoxicischemic damage: review of the current treatment possibilities. Physiol Res. 2020 Dec 31;69(Suppl 3):S379-S401. https://doi.org/10.33549/physi....
 
11.
Dumbuya JS, Chen L, Wu JY, et al. The role of G-CSF neuroprotective effects in neonatal hypoxicischemic encephalopathy (HIE): current status. J NEUROINFLAMMATION. 2021 Feb 21;18(1):55. https://doi.org/10.1186/s12974....
 
12.
Hu X, Li S, Doycheva DM, et al. Rh-CSF1 Attenuates Oxidative Stress and Neuronal Apoptosis via the CSF1R/PLCG2/PKA/UCP2 Signaling Pathway in a Rat Model of Neonatal HIE. Oxid Med Cell Longev. 2020 Oct 7;2020:6801587. https://doi.org/10.1155/2020/6....
 
13.
Tanwar J, Singh JB, Motiani RK. Molecular machinery regulating mitochondrial calcium levels: The nuts and bolts of mitochondrial calcium dynamics. Mitochondrion. 2021 Mar;57:9–22. https://doi.org/10.1016/j.mito....
 
14.
Ristovska S, Stomnaroska O, Danilovski D. Hypoxic Ischemic Encephalopathy (HIE) in Term and Preterm Infants. Pril Makedon Akad Na Nauk Umet Oddelenie Za Med Nauki. 2022 Apr 22;43(1):77–84. https://doi.org/10.2478/priloz....
 
15.
Tveita T, Sieck GC. Physiological Impact of Hypothermia: The Good, the Bad, and the Ugly. Physiol Bethesda Md. 2022 Mar 1;37(2):69–87. https://doi.org/10.1152/physio....
 
16.
Barnaś E, Basiuha I, Porada E, et al. Selected environmental factors in mothers of newborns subjected to the therapeutic hypothermia – a case control study. Int J Occup Med Environ Health. 2023 Mar 2;36(1):59–68. https://doi.org/10.13075/ijome....
 
17.
Molloy EJ, El-Dib M, Juul SE, et al. Neuroprotective therapies in the NICU in term infants: present and future. Pediatr Res. 2023 Jun;93(7):1819–1827. https://doi.org/10.1038/s41390....
 
18.
Gulczynska EM, Gadzinowski J, Kesiak M, et al. Therapeutic hypothermia in asphyxiated newborns: selective head cooling vs. whole body cooling – comparison of short term outcomes. Ginekol Pol. 2019;90(7):403–410. https://doi.org/10.5603/GP.201....
 
19.
Celik Y, Özgür A, Sungur MA, et al. Is Selective Head Cooling Combined with Whole-Body Cooling the Most Effective Hypothermia Method for Neonatal Hypoxic-Ischemic Encephalopathy? Ther Hypothermia Temp Manag. 2023 Jun;13(2):70–76. https://doi.org/10.1089/ther.2....
 
20.
Souza GRE, Zambeli LDO, Ruela VP, et al. Comparação entre resfriamento seletivo da cabeça e resfriamento de corpo inteiro na hipotermia terapêutica neonatal. ABCS Health Sci [Internet]. 2022 Nov 21 [cited 2025 Jan 22]; Available from: https://www.portalnepas.org.br... https://doi.org/10.7322/abcshs....
 
21.
Bellini C, Ramenghi LA, Gente M. Effective Passive Cooling During Neonatal Transport. Ther Hypothermia Temp Manag. 2022 Sep;12(3):168–170. https://doi.org/10.1089/ther.2....
 
22.
Rana R, Manktelow A, Lyden E, et al. Short-Term Outcomes of Neonates with Hypoxic-Ischemic Encephalopathy Receiving Active Versus Passive Cooling During Transport. Ther Hypothermia Temp Manag. 2024 Sep;14(3):205–210. https://doi.org/10.1089/ther.2....
 
23.
Hagan JL. Meta-analysis comparing temperature on arrival at the referral hospital of newborns with hypoxic ischemic encephalopathy cooled with a servo-controlled device versus no device during transport. J Neonatal-Perinat Med. 2021;14(1):29–41. https://doi.org/10.3233/NPM-20....
 
24.
Momin S, Thomas S, Zein H, et al. Comparing Three Methods of Therapeutic Hypothermia Among Transported Neonates with Hypoxic-Ischemic Encephalopathy. Ther Hypothermia Temp Manag. 2023 Sep;13(3):141–148. https://doi.org/10.1089/ther.2....
 
25.
Victor S, Rocha-Ferreira E, Rahim A, et al. New possibilities for neuroprotection in neonatal hypoxic-ischemic encephalopathy. Eur J Pediatr. 2022 Mar;181(3):875–887. https://doi.org/10.1007/s00431....
 
26.
Ovcjak A, Pontello R, Miller SP, et al. Hypothermia combined with neuroprotective adjuvants shortens the duration of hospitalization in infants with hypoxic ischemic encephalopathy: Metaanalysis. Front Pharmacol. 2022;13:1037131. https://doi.org/10.3389/fphar.....
 
27.
Sabir H, Maes E, Zweyer M, et al. Comparing the efficacy in reducing brain injury of different neuroprotective agents following neonatal hypoxia-ischemia in newborn rats: a multi-drug randomized controlled screening trial. Sci Rep. 2023 Jun 10;13(1):9467. https://doi.org/10.1038/s41598....
 
28.
Marsia S, Kumar D, Raheel H, et al. Evaluating the Safety and Efficacy of Erythropoietin Therapy for Neonatal Hypoxic-Ischemic Encephalopathy: A Systematic Review and Meta-Analysis. Pediatr Neurol. 2024 Mar;152:4–10. https://doi.org/10.1016/j.pedi....
 
29.
Wu YW, Comstock BA, Gonzalez FF, et al. Trial of Erythropoietin for Hypoxic-Ischemic Encephalopathy in Newborns. N Engl J Med. 2022 Jul 14;387(2):148–159. https://doi.org/10.1056/NEJMoa....
 
30.
Xu Y, Huang L, Han J, Zhou Y. Effects of EPO combined with mild hypothermia on oxidative stress and neuroprotection in neonates with hypoxic-ischemic encephalopathy. Cell Mol Biol Noisy--Gd Fr. 2022 Apr 30;68(4):36–45. https://doi.org/10.14715/cmb/2....
 
31.
Zhou L, McDonald C, Yawno T, et al. Umbilical Cord Blood and Cord Tissue-Derived Cell Therapies for Neonatal Morbidities: Current Status and Future Challenges. Stem Cells Transl Med. 2022 Mar 17;11(2):135–145. https://doi.org/10.1093/stcltm....
 
32.
Sato Y, Tsuji M. Diverse actions of cord blood cell therapy for hypoxic-ischemic encephalopathy. Pediatr Int Off J Jpn Pediatr Soc. 2021 May;63(5):497–503. https://doi.org/10.1111/ped.14....
 
33.
Matsuyama N, Shimizu S, Ueda K, et al. Safety and tolerability of a multilineage-differentiating stress-enduring cell-based product in neonatal hypoxic-ischaemic encephalopathy with therapeutic hypothermia (SHIELD trial): a clinical trial protocol open-label, non-randomised, dose-escalation trial. BMJ Open. 2022 Apr 26;12(4):e057073. https://doi.org/10.1136/bmjope....
 
34.
Lee SH, Choung JS, Kim JM, et al. Distribution of Embryonic Stem Cell-Derived Mesenchymal Stem Cells after Intravenous Infusion in Hypoxic-Ischemic Encephalopathy. Life Basel Switz. 2023 Jan 13;13(1):227. https://doi.org/10.3390/life13....
 
35.
Al-Ward H, Chen W, Gao W, et al. Can miRNAs in MSCs-EVs Offer a Potential Treatment for Hypoxic-ischemic Encephalopathy? Stem Cell Rev Rep. 2025 Jan;21(1):236–53. https://doi.org/10.1007/s12015....
 
36.
Durán Fernández-Feijóo C, Rodríguez-Fanjul J, Lopez-Abat M, et al. Effects of Hypothermia and Allopurinol on Oxidative Status in a Rat Model of Hypoxic Ischemic Encephalopathy. Antioxid Basel Switz. 2021 Sep 25;10(10):1523. https://doi.org/10.3390/antiox....
 
37.
Engel C, Rüdiger M, Benders MJNL, et al. Detailed statistical analysis plan for ALBINO: effect of Allopurinol in addition to hypothermia for hypoxic-ischemic Brain Injury on Neurocognitive Outcome – a blinded randomized placebo-controlled parallel group multicenter trial for superiority (phase III). Trials. 2024 Jan 24;25(1):81. https://doi.org/10.1186/s13063....
 
38.
Saraiva SM, Jacinto TA, Gonçalves AC, et al. Overview of Caffeine Effects on Human Health and Emerging Delivery Strategies. Pharm Basel Switz. 2023 Jul 27;16(8):1067. https://doi.org/10.3390/ph1608....
 
39.
Bruschettini M, Moreira A, Pizarro AB, et al. The effects of caffeine following hypoxic-ischemic encephalopathy: A systematic review of animal studies. Brain Res. 2022 Sep 1;1790:147990. https://doi.org/10.1016/j.brai....
 
40.
Laughon ME, Johnson JK, Greenberg RG, et al. Methylxanthine use in infants with hypoxicischemic encephalopathy: a retrospective cohort study. Sci Rep. 2024 Aug 17;14(1):19082. https://doi.org/10.1038/s41598....
 
41.
Bernis ME, Burkard H, Bremer AS, et al. The Neuroprotective Effects of Caffeine in a Neonatal Hypoxia-Ischemia Model are Regulated through the AMPK/mTOR Pathway. Int J Biol Sci. 2025 Jan 1;21(1):251–270. https://doi.org/10.7150/ijbs.1....
 
42.
Ahmed J, Pullattayil S AK, Robertson NJ, et al. Melatonin for neuroprotection in neonatal encephalopathy: A systematic review & meta-analysis of clinical trials. Eur J Paediatr Neurol EJPN Off J Eur Paediatr Neurol Soc. 2021 Mar;31:38–45. https://doi.org/10.1016/j.ejpn....
 
43.
Beldarrain G, Hilario E, Lara-Celador I, et al. The Long-Term Neuroprotective Effect of the Endocannabinoid 2-AG and Modulation of the SGZ’s Neurogenic Response after Neonatal HypoxiaIschemia. Pharmaceutics. 2023 Jun 7;15(6):1667. https://doi.org/10.3390/pharma....
 
44.
Dumbuya JS, Chen L, Shu SY, et al. G-CSF attenuates neuroinflammation and neuronal apoptosis via the mTOR/p70SK6 signaling pathway in neonatal Hypoxia-Ischemia rat model. Brain Res. 2020 Jul 15;1739:146817. https://doi.org/10.1016/j.brai....
 
45.
Yang M, Wang K, Liu B, et al. Hypoxic-Ischemic Encephalopathy: Pathogenesis and Promising Therapies. Mol Neurobiol. 2025 Feb;62(2):2105–2122. https://doi.org/10.1007/s12035....
 
46.
Dutta S, Shah RB, Singhal S, et al. Metformin: A Review of Potential Mechanism and Therapeutic Utility Beyond Diabetes. Drug Des Devel Ther. 2023;17:1907–1932. https://doi.org/10.2147/DDDT.S....
 
47.
Silva D, Rocha R, Correia AS, et al. Repurposed Edaravone, Metformin, and Perampanel as a Potential Treatment for Hypoxia-Ischemia Encephalopathy: An In Vitro Study. Biomedicines. 2022 Nov 25;10(12):3043. https://doi.org/10.3390/biomed....
 
48.
Livingston JM, Syeda T, Christie T, et al. Subacute metformin treatment reduces inflammation and improves functional outcome following neonatal hypoxia ischemia. Brain Behav Immun – Health. 2020 Aug;7:100119. https://doi.org/10.1016/j.bbih....
 
49.
Bourget C, Adams KV, Morshead CM. Reduced microglia activation following metformin administration or microglia ablation is sufficient to prevent functional deficits in a mouse model of neonatal stroke. J Neuroinflammation. 2022 Jun 15;19(1):146. https://doi.org/10.1186/s12974....
 
50.
Garcia-Alix A, Arnaez J, Arca G, et al. Hypoxic-ischaemic encephalopathy code: A systematic review for resource-limited settings. An Pediatría Engl Ed. 2024 Apr 1;100(4):275–286. https://doi.org/10.1016/j.anpe....
 
51.
Thayyil S, Pant S, Montaldo P, et al. Hypothermia for moderate or severe neonatal encephalopathy in low-income and middle-income countries (HELIX): a randomised controlled trial in India, Sri Lanka, and Bangladesh. Lancet Glob Health. 2021 Aug 3;9(9):e1273–85. https://doi.org/10.1016/S2214-....
 
eISSN:1898-7516
ISSN:1898-2395
Journals System - logo
Scroll to top