Timing of hydrocortisone therapy in neonates with shock: a systematic review, meta-analysis, and clinical practice guideline

Abstract

Background:

The effect of the timing of initiation of hydrocortisone in neonatal shock has not been evaluated. The objective of this systematic review was to compare the effect of earlier vs. later initiation of hydrocortisone in neonatal shock.

Methods:

Medline, Embase, and CENTRAL were searched from inception until 15 May 2024. Randomized controlled trials (RCTs) and non-RCTs were eligible for inclusion. A random effects meta-analysis was used to synthesize the data. The evidence certainty was evaluated according to Grading of Recommendations Assessment, Development, and Evaluation (GRADE). A clinical practice guideline was formulated as recommended by the GRADE group.

Results:

Of the 3,757 titles and abstracts screened, 20 studies were included: 7 RCTs and 13 non-RCTs. While clinical benefit or harm could not be ruled out for the outcome of mortality from the meta-analysis of the RCTs [early initiation risk ratio (RR): 0.46, 95% confidence interval (CI): 0.03–7.92; late initiation RR: 0.43, 95% CI: 0.12–1.47], the non-RCTs included in the narrative review suggested that late hydrocortisone initiation might be associated with increased risk of mortality. The meta-analysis indicated that early and late hydrocortisone administration may be associated with an increased response to treatment therapy (early initiation RR: 1.85, 95% CI: 1.26–2.71; late initiation RR: 2.50, 95% CI: 1.16–5.39). Late hydrocortisone initiation may increase the risk of necrotizing enterocolitis (NEC) ≥ stage 2 (RR: 2.46, 95% CI: 1.19–5.08). The evidence certainty was very low for most of the outcomes evaluated.

Conclusion:

The early use of hydrocortisone in neonates with shock requiring vasopressors is associated with better outcomes and no major adverse effects. Later institution of hydrocortisone therapy in neonatal shock may improve the response to therapy but may be associated with adverse outcomes including mortality and NEC. The results are to be interpreted with caution as the evidence certainty was predominantly very low.

Systematic Review Registration:

https://www.crd.york.ac.uk/PROSPERO/view/CRD42023432169, identifier: CRD42023432169.

1 Introduction

The use of hydrocortisone (HC) as an adjunct to inotropes in the treatment of neonatal shock is increasing, especially in extremely low birth weight (ELBW) neonates (1). Hydrocortisone administration in vasopressor-resistant shock has been shown to be associated with improved blood pressure (BP) in neonatal shock (2). The American Academy of Pediatrics (2022) concluded that prophylactic early use of hydrocortisone (≤7 days) is associated with a decreased risk of mortality or bronchopulmonary dysplasia (BPD) in ELBW infants exposed to chorioamnionitis (3). Similarly, the Canadian Paediatric Society 2020 recommended the use of early hydrocortisone (within 24–48 h) in extremely low gestational age neonates (ELGANs) born at <28 weeks’ gestation or those born through chorioamnionitis (3). There are no specific guidelines for hydrocortisone usage in vasopressor-resistant shock in neonates, especially with relation to its timing of initiation and dosage.

The mechanism of action of hydrocortisone in neonates with vasopressor-resistant shock includes sensitization of the cardiovascular system to catecholamines through the upregulation of adrenergic receptors, inhibition of catecholamine metabolism, and stabilization of capillary integrity (4). Hydrocortisone also facilitates the reuptake of norepinephrine into the sympathetic system and the expression of angiotensin type 2 receptors in the myocardium, thereby stabilizing the cardiovascular system and maintaining its sensitivity to vasopressors (4).

The etiology of adrenal insufficiency differs between term and preterm neonates (2, 5). While very preterm neonates are known to have primary adrenal insufficiency, the etiopathogenesis in both preterm and term neonates with shock could also be attributed to relative adrenal insufficiency (RAI) (6, 7). RAI is presumed to be due to hypothalamic-pituitary-adrenal (HPA) axis dysfunction (8). In a neonate with shock, the HPA axis may be affected due to reasons such as decreased secretion of cortisol from the adrenal gland secondary to ischemia, resistance of adrenal receptors to adrenocorticotrophic hormone (ACTH) due to inflammatory cytokines, and, finally, a lack of corticosteroid reserve in the adrenal gland relative to the increased metabolic demands (2, 4, 9). Unlike in pediatric and adult populations where there are specific cut-off levels to define primary and RAI, the definitions in neonates are contentious (8, 10, 11). Furthermore, studies in neonates with shock have shown conflicting results for the correlation between baseline serum cortisol levels and treatment response of shock or other adverse events with hydrocortisone administration guided by cortisol levels (12–16).

There is a lacuna in the literature as to when hydrocortisone has to be considered in neonates with shock. Hence, this systematic review and meta-analysis was conducted specifically to evaluate the timing of hydrocortisone initiation in relation to vasopressor therapy. A scoping review of the literature suggested that there was no randomized controlled trial (RCT) comparing hydrocortisone administration with respect to the timing of hydrocortisone initiation in relation to vasopressor therapy in neonates with shock. Hence, we conducted a systematic review and meta-analysis of studies comparing hydrocortisone therapy vs. no hydrocortisone therapy and addressed our objective through sub-group analyses.

2 Methods

2.1 Inclusion criteria

Population (P): Preterm and term neonates (of ≤28 days) diagnosed with shock (as defined by the authors) who were treated with volume expansion and/or inotropes.

Intervention (I): Hydrocortisone of any dosage along with the initiation of the first inotrope (dopamine, dobutamine, epinephrine, or vasopressin). Early vs. late initiation of hydrocortisone was defined as follows:

Early: Initiation of hydrocortisone prior to the initiation of inotropes or along with the addition of the first inotrope or with increasing requirement of inotropes [a cut-off vasoactive-inotropic score (VIS) of ≤10 was taken]. VIS is calculated as follows:

VIS = 1 × Dopamine (μg/kg/min) + 1 × Dobutamine (μg/kg/min) + 100 × Epinephrine (μg/kg/min) + 100 × Norepinephrine (μg/kg/min) + 10 × Milrinone (μg/kg/min) + 10,000 × Vasopressin (IU/kg/min).

Late: Initiation of hydrocortisone when high dosages of inotropes were required (VIS of > 10).

Comparator (C): Use of inotropes alone.

Outcomes (O): The primary outcomes were mortality and response to therapy (as defined by the authors) between 6 and 24 hours after hydrocortisone initiation. Secondary outcomes included blood culture-positive sepsis, necrotizing enterocolitis (NEC) ≥ stage 2 (17), major brain injury (MBI) [intraventricular hemorrhage (IVH) > grade 2 and/or cystic periventricular leukomalacia (PVL)] (18, 19), retinopathy of prematurity (ROP) requiring intervention (20), BPD [defined as oxygen requirement at 36 weeks’ post-menstrual age (PMA)], patent ductus arteriosus (PDA) requiring intervention (medical or surgical), change in BP, duration of inotropes, invasive mechanical ventilation, and hospitalization.

Study designs (S): RCTs; observational studies of either prospective, retrospective, or pre-post design; and conference abstracts were eligible for inclusion. There were no language restrictions. Descriptive reviews and systematic reviews were excluded.

Time frame (T): From inception of the searched databases until 15 May 2024.

Medline, Embase, and CENTRAL were searched from their inception until 15 May 2024 (Supplementary Table S1). Title and abstract screening for the inclusion of studies in the systematic review was performed using online software (Covidence, Veritas Health Innovation, Melbourne, Australia) by two authors blinded to each other (21). Discrepancies were resolved by consensus. The reference lists of the included studies and other similar systematic reviews were searched for potentially eligible studies.

2.2 Data extraction and synthesis

Two authors extracted data using a pre-specified pro forma. Data synthesis was performed using R software version 3.6.2 (R Foundation for Statistical Computing, Vienna, Austria) (22). A random effects pair-wise meta-analysis was performed using the Mantel–Haenszel method for binary outcomes, and the inverse variance method for continuous outcomes.

2.3 Risk of bias assessment

The risk of bias assessment was performed using the Cochrane risk of bias tool version 2.0 for RCTs (23) and Risk Of Bias in Non-randomized Studies of Interventions (ROBINS-I) for non-RCTs (24) by two authors independently. Disagreements were resolved by consensus.

2.4 Certainty of evidence assessment

Evidence certainty was assessed as per the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) guidelines (25). The results of the systematic review and meta-analysis were reported according to modified GRADE recommendations (26, 27) (Supplementary Table S2).

2.5 Evidence to Decision framework and formulation of recommendations

The Evidence to Decision (EtD) framework according to the GRADE working group guidelines was used to arrive at recommendations (28).

2.6 Ethical approval

For this study design, i.e., a systematic review, meta-analysis, and clinical practice guideline, ethical approval is not required.

3 Results

Of the 3,757 titles and abstracts screened, 20 studies were included: 7 RCTs and 13 observational studies (1, 4, 12–15, 29–42). Of these, four RCTs (15, 33, 35, 39) and five observational studies (4, 29, 36, 37, 42) were synthesized in a meta-analysis; three RCTs (14, 31, 34) and eight observational studies (1, 12, 13, 30, 32, 38, 40, 41) were described in the narrative review. Amongst the observational studies, only those that had compared neonates with similar baseline characteristics and those that had adjusted for baseline sickness were included in the data synthesis, and the rest were included in the narrative review. The PRISMA flow is provided in Figure 1. The characteristics of the studies included in the meta-analyses are given in Tables 1, 2 and those included in the narrative review are provided in Table 3.

Figure 1

3.1 Risk of bias

Except for two RCTs (14, 34), all the others had a low risk of overall bias. Whilst one had some issues regarding the domain of measurement of the outcome (14), the other had some issues regarding selective reporting (34) (Supplementary Table S3a).

Whilst only two non-RCTs had a moderate risk of overall bias (36, 41), all the other observational studies had a serious risk of overall bias. The predominant reasons for the studies being adjudged as having a serious risk of bias were due to confounding and issues with the classification of interventions (Supplementary Table S3b).

3.2 Outcomes

3.2.1 Primary outcomes

3.2.1.1 Mortality

The meta-analyses of RCTs indicated that clinical benefit or harm could not be ruled out for the outcome of mortality with the use of early or late hydrocortisone along with inotropes when compared to inotropes alone as the effect estimates were statistically non-significant and the certainty of evidence was very low [early initiation risk ratio (RR): 0.46, 95% confidence interval (CI): 0.03–7.92; late initiation RR: 0.43, 95% CI: 0.12–1.47)]. No observational study reported the outcome of mortality for the use of early hydrocortisone (Figure 2, Supplementary Tables S4, S5). The results from non-RCTs were similar to those of RCTs for late hydrocortisone administration (Figure 2, Supplement Table S5).

Figure 2

3.2.1.2 Response to therapy (as defined by the authors)

The very low certainty of evidence suggested that early and late hydrocortisone administration possibly improved the response to inotrope therapy (early initiation RR: 1.85, 95% CI: 1.26–2.71; late initiation RR: 2.50, 95% CI: 1.16–5.39) (Figure 2, Supplementary Tables S4, S5).

3.2.2 Secondary outcomes

3.2.2.1 Clinical outcomes

Clinical benefit or harm could not be ruled out for any of the clinical outcomes from the meta-analyses of RCTs for either early or late hydrocortisone due to statistically non-significant effect estimates and very low to low evidence certainty (Supplementary Figures S1, S2, Tables S4, S5).

The very low certainty of evidence from an observational study indicated that the late hydrocortisone therapy possibly increased the risk of NEC ≥ stage 2 (RR: 2.46, 95% CI: 1.19–5.08) (Supplementary Figure S1, Table S2).

3.2.2.2 Surrogate outcomes

3.2.2.2.1 Change in BP

Clinical benefit or harm could not be ruled out for this outcome for early hydrocortisone therapy as reported from a single RCT (Figure 3). Meta-analyses of non-RCTs indicated that the administration of hydrocortisone in addition to vasopressor therapy either early or late possibly increased the mean BP, with the evidence certainty being very low [early initiation mean difference (MD): 10.78 mm Hg, 95% CI: 4.40–10.20); late initiation MD: 10.78 mm Hg, 95% CI: 8.59–12.98) (Figure 3, Supplementary Tables S4, S5).

Figure 3

3.2.2.2.2 Requirement of additional inotropes

The low certainty of evidence suggested that early hydrocortisone therapy possibly decreased the risk of the requirement of additional inotropes (RR: 0.18, 95% CI: 0.05–0.69) (Figure 3, Supplementary Table S4).

3.2.2.2.3 Duration of inotropes (hours)

Whilst early hydrocortisone initiation possibly decreased the duration of inotrope therapy (MD: −39.8, 95% CI: −30.29 to −49.31; very low certainty), late hydrocortisone initiation possibly increased the duration (MD: 61.75 h, 95% CI: 43.98–79.52; low certainty) (Figure 3, Supplementary Tables S4, S5). While clinical benefit or harm could not be ruled out for the duration of hospitalization for early hydrocortisone therapy from the meta-analysis of two RCTs, one observational study indicated that late hydrocortisone therapy possibly increased the duration of hospitalization (MD: 38.00 days, 95% CI: 12.11–63.89; low certainty) (Supplementary Figure S2, Tables S4, S5).

Clinical benefit or harm could not be ruled out for the outcome of duration of ventilation for early and late hydrocortisone administration (Supplementary Figure S2, Supplementary Tables S4, S5).

3.2.2.2.4 Hyperglycemia

The study by Ng et al. found a higher incidence of glycosuria in the hydrocortisone-treated group (p = 0.03) (35).

3.2.2.2.5 Correlation with cortisol levels

Bourchier and Weston reported that there was no correlation between the levels of cortisol (after ACTH stimulation) either at baseline or during therapy and the maximum dopamine dosage (14). However, Kovacs et al. reported that baseline cortisol levels were low (<15 μg/dl) in both the randomized groups (early hydrocortisone initiation with inotropes vs. inotropes alone) and that the levels in the inotropes alone group progressively decreased during treatment (p = 0.02) (15). Three observational studies indicated that late hydrocortisone therapy in neonates with high baseline cortisol levels may be associated with an increased risk of mortality and other adverse events such as hyperglycemia requiring insulin therapy, hypertension, and mortality (13, 29, 37).

3.3 Narrative review

Amongst the eight studies included in the narrative review, all except one had evaluated late hydrocortisone therapy. (Table 3) Of the three RCTs included in the descriptive review (14, 31, 34), two had evaluated early hydrocortisone therapy (14, 31). Most of the studies reported an increase in mean BP and a reduction in inotrope usage after hydrocortisone initiation. Robertson et al. studied the use of late hydrocortisone therapy in neonates diagnosed with congenital diaphragmatic hernia (CDH) and reported that after adjusting for baseline sickness, late hydrocortisone therapy was associated with an increased risk of mortality, and that the total duration of hydrocortisone treatment was associated with an increased risk of sepsis (13). Ramanathan et al. concluded that the late administration of hydrocortisone was associated with an increased risk of fungal sepsis (38). Verma et al., in their multivariate analysis, found that late administration of hydrocortisone was associated with an increased risk of IVH in preterm neonates of ≤25 weeks of gestation (40). Helbock et al., who studied late hydrocortisone therapy, reported that four of the six hypotensive ELBW neonates had a baseline cortisol level of <5 μg/dl (12). However, Robertson et al. did not find any statistically significant difference in survival between hypotensive infants with CDH and baseline cortisol levels. The characteristics of the studies included in the narrative review are provided in Table 3.

The EtD framework and the recommendations are provided in Supplementary Tables S6, S7.

4 Discussion

This systematic review and meta-analysis indicated that early hydrocortisone therapy in neonates who require vasopressor therapy was associated with improved outcomes with no major adverse events when compared to the late administration of hydrocortisone.

The results of this meta-analysis indicated that clinical benefit or harm could not be ruled out for the outcome of mortality for either of the interventions. However, Altit et al., Peeples, and Noori et al. indicated that late hydrocortisone therapy possibly increased the risk of mortality (29, 36, 37). The results from these studies could not be pooled and were considered in the EtD framework when we formulated the recommendations. For the outcome of the response to therapy, both early and late hydrocortisone therapy as an adjunct to inotropes were possibly beneficial. Further, late HC therapy was possibly associated with an increased duration of inotrope therapy. Multiple studies in adult populations have reported that prolonged exposure to inotrope therapy is associated with an increased risk of mortality (43–45). We hypothesize that the prolonged exposure to inotropes in the late hydrocortisone group may have contributed to increased mortality. One non-RCT included in our systematic review indicated that late hydrocortisone therapy was possibly associated with an increased risk of NEC ≥ stage 2. Two observational studies included in this systematic review also suggested that late hydrocortisone administration was possibly associated with an increased risk of sepsis (13, 38). Similarly, Hotta et al. also indicated that exposure to dopamine was associated with an increased risk of sepsis in ELGANs, even after adjusting for baseline sickness, which could explain the findings of our systematic review (46).

The results of this systematic review were contentious with respect to baseline cortisol levels and their correlation with response to hydrocortisone therapy or adverse events. Whilst one RCT that had enrolled ELGANs suggested no correlation (14), the other that had included a relatively mature group of infants indicated that the cortisol levels progressively decreased in the placebo group (15). The discrepancy in the results could be attributed to the difficulty in interpreting cortisol levels in neonates as it is complicated by several factors (2). The results from observational studies predominantly suggested that late hydrocortisone therapy in neonates with high baseline cortisol levels was possibly associated with an increased risk of adverse effects including mortality (13, 29, 37). The patient population enrolled in these studies was widely heterogeneous, including ELGANs, infants with hypoxic-ischemic encephalopathy treated with therapeutic hypothermia, and those who were diagnosed with CDH. None of the included studies had evaluated long-term neurodevelopmental outcomes. However, prophylactic low-dose hydrocortisone therapy in ELGANs at the highest risk of mortality or BPD has been studied extensively (47–50). Some of these studies used hydrocortisone for a prolonged period, even up to 15 days at relatively high cumulative dosages (up to >10 mg/kg) (47, 51). Most of these studies indicated improved long-term neurodevelopmental outcomes with prophylactic hydrocortisone, though the patient population evaluated in these studies differed from ours (52–54). Unlike dexamethasone, which only has glucocorticoid activity, suppresses endogenous cortisol, and, hence downregulates the mineralocorticoid receptor stimulation of neurons through endogenous cortisol, resulting in neuronal apoptosis, hydrocortisone acts similar to endogenous cortisol with the stimulation of both glucocorticoid and mineralocorticoid receptors. This might be one of the possible reasons for better long-term neurodevelopmental outcomes with hydrocortisone when compared to dexamethasone.

After careful consideration of the aspects specified in the EtD framework, the guideline development group suggested that early hydrocortisone may be used in the treatment of neonates with fluid refractory shock as an adjunct to inotropes. We suggest initiating hydrocortisone therapy when there is an increased requirement for inotropes. The most commonly used first-line inotrope included in this systematic review was dopamine, and hydrocortisone therapy may be initiated if the neonate requires a dopamine dosage of ≥10 μg/kg/min, which translates to a VIS of 10. There is insufficient evidence to recommend the timing of the introduction of hydrocortisone in relation to other inotropes such as epinephrine, norepinephrine, vasopressin, and milrinone when used as a first-line treatment. In such scenarios, dopamine equivalent doses adjudged according to the VIS may be considered. The equivalent doses would be dobutamine ≥10 mcg/kg/min, epinephrine ≥0.1 mcg/kg/min, norepinephrine ≥0.1 mcg/kg/min, vasopressin ≥0.0001 IU/kg/min, and milrinone ≥1 μg/kg/min. This is a weak recommendation with very low evidence certainty.

The dosage of hydrocortisone utilized in the studies varied widely. In preterm neonates, 1 mg/kg followed by 0.5–1 mg/kg every 8–12 h of hydrocortisone may be considered. Whereas in term neonates, a dose of 2 mg/kg followed by 1 mg/kg every 6–8 h may be used. Further, hydrocortisone may be tapered over 2–3 days once the desired effect has been achieved, i.e., when the neonate is being weaned from inotropes.

To the best of our knowledge, this is the only clinical practice guideline on the timing of instituting hydrocortisone therapy in neonates with shock. There were several limitations to this systematic review. First, it was a pragmatic review with a widely disparate patient population. Second, the dosage of hydrocortisone utilized was different between the included studies. We addressed the first two limitations by downrating the level of evidence for the indirectness related to the patient population domain and the intervention. Finally, we only included published literature.

5 Conclusions

Earlier use of hydrocortisone in neonates with shock is possibly associated with better outcomes with no significant adverse effects. Later administration of hydrocortisone in neonates with shock may be associated with an increased risk of mortality, NEC, and prolonged duration of inotropes and hospital stay. The recommendations were predominantly based on very low evidence certainty which indicates the need for adequately powered multi-center trials that evaluate the timing of introduction of hydrocortisone in neonatal shock.

References

• 1.

  RiosDRMoffettBSKaiserJR. Trends in pharmacotherapy for neonatal hypotension. J Pediatr. (2014) 165(4):697–701.e1. 10.1016/j.jpeds.2014.06.009

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 2.

  KumbhatNNooriS. Corticosteroids for neonatal hypotension. Clin Perinatol. (2020) 47(3):549–62. 10.1016/j.clp.2020.05.015

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 3.

  CummingsJJPramanikAK, Committee on Fetus and Newborn. Postnatal corticosteroids to prevent or treat chronic lung disease following preterm birth. Pediatrics. (2022):e2022057530. 10.1542/peds.2022-057530

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 4.

  SeriI. Hydrocortisone and vasopressor-resistant shock in preterm neonates. Pediatrics. (2006) 117(2):516–8. 10.1542/peds.2005-2057

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 5.

  FernandezESchraderRWatterbergK. Prevalence of low cortisol values in term and near-term infants with vasopressor-resistant hypotension. J Perinatol. (2005) 25(2):114–8. 10.1038/sj.jp.7211211

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 6.

  NgPCLamCWLeeCHMaKCFokTFChanIHet alReference ranges and factors affecting the human corticotropin- releasing hormone test in preterm, very low birth weight infants. J Clin Endocrinol Metab. (2002) 87(10):4621–8. 10.1210/jc.2001-011620

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 7.

  WatterbergKLScottSM. Evidence of early adrenal insufficiency in babies who develop bronchopulmonary dysplasia. Pediatrics. (1995) 95(1):120–5. 10.1542/peds.95.1.120

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 8.

  CooperMSStewartPM. Corticosteroid insufficiency in acutely ill patients. N Engl J Med. (2003) 348(8):727–34. 10.1056/NEJMra020529

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 9.

  TsaoPvon ZastrowM. Downregulation of G protein-coupled receptors. Curr Opin Neurobiol. (2000) 10(3):365–9. 10.1016/S0959-4388(00)00096-9

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 10.

  AucottSW. The challenge of defining relative adrenal insufficiency. J Perinatol. (2012) 32(6):397–8. 10.1038/jp.2012.21

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 11.

  NgPC. Is there a “normal” range of serum cortisol concentration for preterm infants?Pediatrics. (2008) 122(4):873–5. 10.1542/peds.2008-0516

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 12.

  HelbockHJInsoftRMConteFA. Glucocorticoid-responsive hypotension in extremely low birth weight newborns. Pediatrics. (1993) 92(5):715–7. 10.1542/peds.92.5.715

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 13.

  RobertsonJOCrissCNHsiehLBMatsukoNGishJSMonRAet alSteroid use for refractory hypotension in congenital diaphragmatic hernia. Pediatr Surg Int. (2017) 33(9):981–7. 10.1007/s00383-017-4122-3

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 14.

  BourchierDWestonPJ. Randomised trial of dopamine compared with hydrocortisone for the treatment of hypotensive very low birthweight infants. Arch Dis Child Fetal Neonatal Ed. (1997) 76(3):F174–8. 10.1136/fn.76.3.F174

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 15.

  KovacsKSzakmarEMederUSzakacsLCsekoAVataiBet alA randomized controlled study of low-dose hydrocortisone versus placebo in dopamine-treated hypotensive neonates undergoing hypothermia treatment for hypoxic-ischemic encephalopathy. J Pediatr. (2019) 211:13–19.e3. 10.1016/j.jpeds.2019.04.008

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 16.

  RenolleauCToumaziABourmaudABenoistJFChevenneDMohamedDet alAssociation between baseline cortisol serum concentrations and the effect of prophylactic hydrocortisone in extremely preterm infants. J Pediatr. (2021) 234:65–70.e3. 10.1016/j.jpeds.2020.12.057

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 17.

  WalshMCKliegmanRM. Necrotizing enterocolitis: treatment based on staging criteria. Pediatr Clin North Am. (1986) 33(1):179–201. 10.1016/S0031-3955(16)34975-6

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 18.

  de VriesLSEkenPGroenendaalFvan HaastertICMeinersLC. Correlation between the degree of periventricular leukomalacia diagnosed using cranial ultrasound and MRI later in infancy in children with cerebral palsy. Neuropediatrics. (1993) 24(5):263–8. 10.1055/s-2008-1071554

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 19.

  PapileLABursteinJBursteinRKofflerH. Incidence and evolution of subependymal and intraventricular hemorrhage: a study of infants with birth weights less than 1,500 gm. J Pediatr. (1978) 92(4):529–34. 10.1016/S0022-3476(78)80282-0

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 20.

  ChiangMFQuinnGEFielderAROstmoSRPaul ChanRVBerrocalAet alInternational classification of retinopathy of prematurity, third edition. Ophthalmology. (2021) 128(10):e51–68. 10.1016/j.ophtha.2021.05.031

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 21.

  Covidence systematic review software, Veritas Health Innovation, Melbourne, Australia. Available at.www.covidence.org(Accessed July 3, 2023).

  • Google Scholar

• 22.

  R Core Team. R: A Language and Environment for Statistical Computing. Vienna, Austria: R Foundation for Statistical Computing (2020). Available online at:https://www.R-project.org/(accessed June 3, 2023).

  • Google Scholar

• 23.

  SterneJACSavovicJPageMJElbersRGBlencoweNSBoutronIet alRob 2: a revised tool for assessing risk of bias in randomised trials. Br Med J. (2019) 366:l4898. 10.1136/bmj.l4898

  • CrossRef
  • Google Scholar

• 24.

  SterneJAHernánMAReevesBCSavovicJBerkmanNDViswanathanMet alROBINS-I: a tool for assessing risk of bias in non-randomised studies of interventions. Br Med J. (2016) 355:i4919. 10.1136/bmj.i4919

  • CrossRef
  • Google Scholar

• 25.

  GuyattGHOxmanADSchünemannHJTugwellPKnottnerusA. GRADE Guidelines: a new series of articles in the journal of clinical epidemiology. J Clin Epidemiol. (2011) 64(4):380–2. 10.1016/j.jclinepi.2010.09.011

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 26.

  SantessoNGlentonCDahmPGarnerPAklEAAlperBet alGRADE Guidelines 26: informative statements to communicate the findings of systematic reviews of interventions. J Clin Epidemiol. (2020) 119:126–35. 10.1016/j.jclinepi.2019.10.014

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 27.

  RamaswamyVVde AlmeidaMFDawsonJATrevisanutoDNakwaFLKamlinCOet alMaintaining normal temperature immediately after birth in late preterm and term infants: a systematic review and meta-analysis. Resuscitation. (2022) 180:81–98. 10.1016/j.resuscitation.2022.09.014

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 28.

  AndrewsJGuyattGOxmanADAldersonPDahmPFalck-YtterYet alGRADE Guidelines: 14. Going from evidence to recommendations: the significance and presentation of recommendations. J Clin Epidemiol. (2013) 66(7):719–25. 10.1016/j.jclinepi.2012.03.013

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 29.

  AltitGVigny-PauMBarringtonKDorvalVGLapointeA. Corticosteroid therapy in neonatal septic shock-do we prevent death?Am J Perinatol. (2018) 35(2):146–51. 10.1055/s-0037-1606188

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 30.

  BakerCFBarksJDEngmannCVazquezDMNealCRJrSchumacherREet alHydrocortisone administration for the treatment of refractory hypotension in critically ill newborns. J Perinatol. (2008) 28(6):412–9. 10.1038/jp.2008.16

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 31.

  BattonBJLiLNewmanNSDasAWatterbergKLYoderBAet alFeasibility study of early blood pressure management in extremely preterm infants. J Pediatr. (2012) 161(1):65–9.e1. 10.1016/j.jpeds.2012.01.014

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 32.

  HeckmannMPohlandtF. Hydrocortisone in preterm infants. Pediatrics. (2002) 109(6):1184–5. author reply 1184-5. 10.1542/peds.109.6.1184

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 33.

  HochwaldOPalegraGOsiovichH. Adding hydrocortisone as 1st line of inotropic treatment for hypotension in very low birth weight infants. Indian J Pediatr. (2014) 81(8):808–10. 10.1007/s12098-013-1151-3

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 34.

  KredietGTvan der EntKRademakerMAKvan BelF. Rapid increase of blood pressure after low dose hydrocortison (HC) in low birth weight neonates with hypotension refractory to high doses of cardio-inotropics. Pediatr Res. (1998) 43:38. 10.1203/00006450-199804001-00231

  • CrossRef
  • Google Scholar

• 35.

  NgPCLeeCHBnurFLChanIHLeeAWWongEet alA double-blind, randomized, controlled study of a “stress dose” of hydrocortisone for rescue treatment of refractory hypotension in preterm infants. Pediatrics. (2006) 117(2):367–75. 10.1542/peds.2005-0869

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 36.

  NooriSFriedlichPWongPEbrahimiMSiassiBSeriI. Hemodynamic changes after low-dosage hydrocortisone administration in vasopressor-treated preterm and term neonates. Pediatrics. (2006) 118(4):1456–66. 10.1542/peds.2006-0661

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 37.

  PeeplesES. An evaluation of hydrocortisone dosing for neonatal refractory hypotension. J Perinatol. (2017) 37(8):943–6. 10.1038/jp.2017.68

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 38.

  RamanathanRSiassiBSardesaiS. Dexamethasone versus hydrocortisone for hypotension refractory to high dose inotropic agents and incidence of Candida infection in extremely low birth weight infants. Pediatr Res. (1996) 39(Suppl 4):240. 10.1203/00006450-199604001-01448

  • CrossRef
  • Google Scholar

• 39.

  SalasGTravagliantiMLeoneACouceiroCRodríguezSFariñaD. Hidrocortisona para el tratamiento de hipotensión refractaria: ensayo clínico controlado y aleatorizado [hydrocortisone for the treatment of refractory hypotension: a randomized controlled trial]. An Pediatr (Barc). (2014) 80(6):387–93. 10.1016/j.anpedi.2013.08.004

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 40.

  VermaRPDasnadiSZhaoYChenHH. A comparative analysis of ante- and postnatal clinical characteristics of extremely premature neonates suffering from refractory and non-refractory hypotension: is early clinical differentiation possible?Early Hum Dev. (2017) 113:49–54. 10.1016/j.earlhumdev.2017.07.010

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 41.

  VisveshwaraNPeckMWellsRBansalVChopraDRajaniK. Efficacy of hydrocortisone in restoring blood pressure in infants on dopamine therapy. Pediatr Res. (1996) 39:251. 10.1203/00006450-199604001-01512

  • CrossRef
  • Google Scholar

• 42.

  MizobuchiMYoshimotoSNakaoH. Time-course effect of a single dose of hydrocortisone for refractory hypotension in preterm infants. Pediatr Int. (2011) 53(6):881–6. 10.1111/j.1442-200X.2011.03372.x

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 43.

  Abdul AzizANThomasSMurthyPRabiYSoraishamAStritzkeAet alEarly inotropes use is associated with higher risk of death and/or severe brain injury in extremely premature infants. J Matern Fetal Neonatal Med. (2020) 33(16):2751–8. 10.1080/14767058.2018.1560408

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 44.

  FrancisGSBartosJAAdatyaS. Inotropes. J Am Coll Cardiol. (2014) 63(20):2069–78. 10.1016/j.jacc.2014.01.016

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 45.

  VanValkinburghDKerndtCCHashmiMF. Inotropes and vasopressors. [updated 2023 Feb 19]. In: StatPearls. Treasure Island (FL): StatPearls Publishing (2023). Available online at:https://www.ncbi.nlm.nih.gov/books/NBK482411/#(accessed 5 June 2023).

  • Google Scholar

• 46.

  HottaMHirataKNozakiMMochizukiNHiranoSWadaK. Association between amount of dopamine and infections in extremely preterm infants. Eur J Pediatr. (2020) 179(11):1797–803. 10.1007/s00431-020-03676-7

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 47.

  BaudOMauryLLebailFRamfulDEl MoussawiFNicaiseCet alEffect of early low-dose hydrocortisone on survival without bronchopulmonary dysplasia in extremely preterm infants (PREMILOC): a double-blind, placebo-controlled, multicentre, randomised trial. Lancet. (2016) 387(10030):1827–36. 10.1016/S0140-6736(16)00202-6

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 48.

  BonsanteFLatorreGIacobelliSForziatiVLaforgiaNEspositoLet alEarly low-dose hydrocortisone in very preterm infants: a randomized, placebo-controlled trial. Neonatology. (2007) 91(4):217–21. 10.1159/000098168

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 49.

  EfirdMMHeerensATGordonPVBoseCLYoungDA. A randomized-controlled trial of prophylactic hydrocortisone supplementation for the prevention of hypotension in extremely low birth weight infants. J Perinatol. (2005) 25(2):119–24. 10.1038/sj.jp.7211193

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 50.

  WatterbergKLGerdesJSGiffordKLLinHM. Prophylaxis against early adrenal insufficiency to prevent chronic lung disease in premature infants. Pediatrics. (1999) 104(6):1258–63. 10.1542/peds.104.6.1258

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 51.

  WatterbergKLGerdesJSColeCHAucottSWThiloEHMammelMCet alProphylaxis of early adrenal insufficiency to prevent bronchopulmonary dysplasia: a multicenter trial. Pediatrics. (2004) 114(6):1649–57. 10.1542/peds.2004-1159

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 52.

  PeltoniemiOMLanoAPuosiRYlihervaABonsanteFKariMAet alTrial of early neonatal hydrocortisone: two-year follow-up. Neonatology. (2009) 95(3):240–7. 10.1159/000164150

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 53.

  TroussonCToumaziABourmaudABiranVBaudO. Neurocognitive outcomes at age 5 years after prophylactic hydrocortisone in infants born extremely preterm. Dev Med Child Neurol. (2023) 65(7):926–32. 10.1111/dmcn.15470

  • Pubmed Abstract
  • CrossRef
  • Google Scholar

• 54.

  WatterbergKLShafferMLMishefskeMJLeachCLMammelMCCouserRJet alGrowth and neurodevelopmental outcomes after early low-dose hydrocortisone treatment in extremely low birth weight infants. Pediatrics. (2007) 120(1):40–8. 10.1542/peds.2006-3158

  • Pubmed Abstract
  • CrossRef
  • Google Scholar