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. 2022 Nov 14;9(11):1745. doi: 10.3390/children9111745

Table 1.

Summary of the characteristics of the included studies with evidence on ISN and COVID-19 in pediatric patients (n = 34 studies), 2020–2022.

Author, Year, Study Location Study Design, Setting Age (Months) a Male, n (%) Ethnicity Comorbidities, n Number of Patients (n = 1828) Number of SARS-CoV-2 Patients with ISN (n = 64, 3.5%) ISN Classification by Location
AND Symptoms from ISN, n
Laboratory Findings Imaging Admitted to ICU, n Mechanical Ventilation, n ARDS, n Treatment, n; If Failure to Pneumatic, Hydrostatic or Surgical Reduction Occurred; If ISN Was Recurrent Assessment of Study Risk of Bias (Tool Used, Finding); Treatment Outcome
Acharyya et al., 2022 [15], India Retrospective case report, single center 4 1 (100) 1 Indian 1 No medical history 1 1 1 Ileocolic ISN
AND
1 Abdominal pain
1 Abdominal distension
1 Blood in stool
1 Large hematoma in the serous layer of the intestine
1 Raised procalcitonin
1 High D-dimer
1 High prothrombin time
1 High NT-proBNP
1 Acute ISN
1 Multiple air fluid levels
0 0 0 1 Surgical reduction of the ISN
No failure (n = 1)
No recurrence (n = 1)
(Modified NOS, high)
1 survived
Agarwalla and Jalan 2022 [16], India Retrospective case report, single center 10 1 (100) 1 Indian 1 No medical history 1 1 1 Ileo-ileal ISN
AND
1 Abdominal pain
1 Abdominal tenderness
1 Crying
1 Vomiting
1 Red currant jelly stools
1 Drowsiness
1 Low BP
1 Pallor
1 Tachycardia
1 Low oxygen saturation
1 Cold extremities
1 Peripheral pulses
1 Autonomic dysfunction
1 Irregular heartbeat
1 Ectopic beats
1 Low Hb
1 High CRP
1 High ferritin
1 High D-dimer
1 High LDH
1 Acute ISN 1 0 1 1 Surgical reduction of the ISN
1 Dopamine
1 IV fluids
1 Oxygen supplementation
1 Inotropes
1 Antibiotics
1 Steroids
1 Anticoagulant
1 NGT feeding
1 Removal of surgical drain
1 Dressing
No failure (n = 1)
No recurrence (n = 1)
(Modified NOS, high)
1 Survived
Athamnah et al., 2021 [17], Jordan Retrospective case report, single center 2.5 1 (100) 1 Arab 1 No medical history 1 1 1 Ileocolic ISN
AND
1 Fever
1 Vomiting
1 Dehydration
1 Blood in stool
1 Abdominal distension
1 Abdominal tenderness
1 Bilious discharge from the NGT
1 Red currant jelly stools
1 Not reported 1 Distal small bowel obstruction and decreased gas in the colon
1 Acute ISN (target sign)
0 0 0 1 Pneumatic reduction of the ISN
1 IV fluids
1 Antibiotics
No failure (n = 1)
No recurrence (n = 1)
(Modified NOS, high)
1 Survived
Bazuaye-Ekwuyasi et al., 2020 [4], United States Retrospective case report, single center 9 1 (100) 1 Hispanic 1 No medical history 1 1 1 Ileocolic ISN
AND
1 Vomiting
1 Abdominal pain
1 Anorexia
1 Blood in stool
1 Dehydration
1 Ketonuria
1 Proteinuria
1 Decreased lymphocytes
1 Acute ISN
1 Colon cutoff sign of ISN
0 0 0 1 Hydrostatic reduction of the ISN
No failure (n = 1)
No recurrence (n = 1)
(Modified NOS, high)
1 Survived
Cai et al., 2020 [5], China Retrospective case-series, single center 10 0 (0) 1 Asian 1 No medical history 5 1 1 Location was not reported
AND
1 Crying
1 Restlessness
1 Vomiting
1 Red currant jelly stools
1 Apathy
1 Drowsiness
1 Convulsions
1 Septic shock
1 Multiple organ dysfunction
1 Abdominal distension
1 Blood in stool
1 Coffee dreg-like gastric contents
1 Leukopenia
1 Decreased lymphocytes
1 Thrombocytopenia
1 High CRP
1 Raised procalcitonin
1 High D-dimer
1 High prothrombin time
1 High APTT
1 High ferritin
1 High interleukin-6
1 High interleukin-10
1 Hypoalbuminemia
1 Hyponatremia
1 Hypocalcemia
1 Reduced number of CD3+, CD4+, CD8+ T lymphocytes and CD16 + CD56 natural killer cells
1 Acute ISN
1 Large amount of abdominal dropsy
1 Necrosis of the proximal ileus of the small intestine
1 1 1 1 Steroids
1 IVIG
1 Interferon
1 Antivirals
1 Antibiotics
1 Oxygen supplementation
1 CRRT
1 Plasma exchange
1 Surgical resection of necrotic intestine
1 Dopamine
1 Dobutamine
No failure (n = 1)
No recurrence (n = 1)
(Modified NOS, high)
1 Died
Castellazzi et al., 2021 [18], Italy Retrospective case report, single center 10 0 (0) 1 White (Caucasian) 1 No medical history 1 1 1 Ileocolic ISN
AND
1 Abdominal pain
1 Irritability
1 Anorexia
1 Crying
1 Vomiting
1 Rectal blood
1 Spiking colicky pain
1 High CRP 1 Acute ISN
1 Increased thickness of the intestinal wall and accompanying mesentery
1 Enlarged lymph nodes
0 0 0 1 Hydrostatic reduction of the ISN
1 Antibiotics
1 IV fluids
1 Surgical reduction of the ISN
1 Laparotomy
1 Ileocecopexy
Yes failure (hydrostatic, n = 1)
No recurrence (n = 1)
(Modified NOS, high)
1 Survived
Díaz-Ruiz et al., 2022 [19], Peru Retrospective case report, single center 72 1 (100) 1 Hispanic 1 No medical history 1 1 1 Ileocolic ISN
AND
1 Abdominal pain
1 Liquid stools with mucus and no blood
1 Anorexia
1 Chills
1 Vomiting
1 Nausea
1 High CRP
1 High leukocytes
1 Acute ISN 0 0 0 1 Surgical reduction of the ISN
1 Laparotomy
1 Appendectomy
1 Analgesics
No failure (n = 1)
No recurrence (n = 1)
(Modified NOS, high)
1 Survived
Du et al., 2021 [20], China Retrospective cohort, single center 10 0 (0) 1 Asian 1 No medical history 182 1 1 Ileocolic ISN
AND
1 Nausea
1 Vomiting
1 Multiple organ dysfunction
1 Intestinal necrosis
1 Septic shock
1 DIC
1 High CRP
1 High LDH
1 High BUN
1 Acute ISN 1 1 1 1 Interferon
1 Antibiotics
1 Oxygen supplementation
No failure (n = 1)
No recurrence (n = 1)
(NOS, 7)
1 Died
Fadgyas et al., 2022 [21], Hungary Retrospective case report, single center 90 1 (100) 1 White (Caucasian) 1 Left-sided renal agenesis
1 Developmental delay
1 Meningism
1 1 1 Ileocolic ISN
AND
1 Abdominal tenderness
1 Headache
1 Vomiting
1 Facial petechiae
1 Dehydration
1 Abdominal pain
1 Low BP
1 High CRP
1 High WBCs
1 High neutrophils
1 High D-dimer
1 Raised liver enzymes
1 Raised bilirubin
1 High troponin
1 Enlarged mesenteric lymph nodes
1 Acute ISN
1 Very dilated, fluid- and gas-filled small bowel loops
1 Meckel’s diverticulum
1 Bowel obstruction
1 1 0 1 Antibiotics
1 Analgesics
1 IV fluids
1 Oxygen supplementation
1 Laparotomy
1 Surgical resection
1 Anastomosis
No failure (n = 1)
No recurrence (n = 1)
(Modified NOS, high)
1 Survived
García et al., 2021 [22], Guatemala Retrospective case report, single center 6 1 (100) 1 Hispanic 1 No medical history 1 1 1 Ileocolic ISN
AND
1 Irritability
1 Vomiting
1 Red currant jelly stools
1 Pallor
1 Abdominal pain
1 Low Hb
1 High D-dimer
1 High CRP
1 High ferritin
1 Acute ISN
1 Dilation of intestinal loops
1 Poor gas distribution
0 0 0 1 Antibiotics
1 Analgesics
1 Surgical resection
1 Oxygen supplementation
1 Total parenteral nutrition
No failure (n = 1)
No recurrence (n = 1)
(Modified NOS, high)
1 Survived
Guerrón and Figueroa 2021 [23], Colombia Retrospective case report, single center 5 1 (100) 1 Hispanic 1 No medical history 1 1 1 Ileocolic ISN
AND
1 Vomiting
1 Red currant jelly stools
1 Absence of bowel sounds
1 Anorexia
1 Not reported 1 Acute ISN
1 Significant colonic parietal thickening
0 0 0 1 Hydrostatic reduction of the ISN
No failure (n = 1)
No recurrence (n = 1)
(Modified NOS, high)
1 Survived
Hyun et al., 2022 [24], United States Retrospective case report, single center 20 0 (0) 1 Hispanic 1 No medical history 1 1 1 Ileocolic ISN
AND
1 Weakness
1 Lethargy
1 Abdominal pain
1 Abdominal tenderness
1 Increased fussiness
1 Crying
1 Facial cyanosis
1 Cold extremities
1 Perception of a firm and painful mass
1 Low oxygen saturation
1 High WBCs
1 High neutrophils
1 High monocytes
1 Hypokalemia
1 High LDH
1 Acute ISN
1 Concentric rings of the bowel
1 Enlarged lymph nodes
0 0 0 1 Analgesics
1 Oxygen supplementation
1 IV fluids
1 Hydrostatic reduction of the ISN
No failure (n = 1)
No recurrence (n = 1)
(Modified NOS, high)
1 Survived
Khan et al., 2021 [25], United States Retrospective case report, single center 2 1 (100) 1 White (Caucasian) 1 No medical history 1 1 1 Ileocolic ISN
AND
1 Abdominal tenderness
1 Vomiting
1 Diarrhea
1 Blood in stool
1 Abdominal distension
1 Red currant jelly stools
1 Not reported 1 Acute ISN
1 Enlarged lymph nodes
0 0 0 1 Pneumatic reduction of the ISN
No failure (n = 1)
No recurrence (n = 1)
(Modified NOS, high)
1 Survived
Leiva et al., 2022 [26], United States Retrospective case reports, single center 7 and 9 1 (50) 2 Whites (Caucasians) 1 No medical history 2 2 2 Ileocolic ISN
AND
2 Abdominal pain
2 Irritability
1 Vomiting
2 Blood in stool
1 Not reported 2 Acute ISN
1 Hypertrophied lymph nodes
0 0 0 2 Hydrostatic reductions of the ISN
2 Surgical reductions of the ISN
2 Laparotomy
Yes failure (hydrostatic, n = 2)
No recurrence (n = 2)
(Modified NOS, high)
2 Survived
Makrinioti et al., 2020 [6], United Kingdom Retrospective case reports, multicenter 10 and 10 0 (0) 1 White (Caucasian)
and
1 Asian
2 No medical history 2 2 2 Ileocolic ISN
AND
1 Crying
2 Vomiting
2 Red currant jelly stools
1 Abdominal distension
1 Absence of bowel sounds
1 Peritonitis
1 Ascites
1 Swelling of the small intestinal wall
1 Lethargy
1 DIC
2 High CRP 1 Acute ISN 1 1 1 2 Pneumatic reductions of the ISN
1 Laparotomy
1 Defunctioning ileostomy
1 Antibiotics
1 Inotropes
1 Surgical reduction of the ISN
1 Ladd’s procedure
No failure (n = 1)
Yes failure (pneumatic, n = 1)
No recurrence (n = 2)
(Modified NOS, high)
1 Survived
1 Died
Martínez-Castaño et al., 2020 [27], Spain Retrospective case report, single center 6 1 (100) 1 White (Caucasian) 1 No medical history 1 1 1 Ileocolic ISN
AND
1 Vomiting
1 Abdominal cramps
1 Red currant jelly stools
1 Anemia
1 Low Hb
1 High CRP
1 High WBCs
1 Acute ISN (target sign) 0 0 0 1 Hydrostatic reduction of the ISN
No failure (n = 1)
No recurrence (n = 1)
(Modified NOS, high)
1 Survived
Mercado-Martínez et al., 2021 [28], Mexico Retrospective case reports, multicenter 8 and 7 1 (50) 2 Hispanics 2 No medical history 2 2 2 Ileocolic ISN
AND
1 Crying
2 Vomiting
2 Red currant jelly stools
2 Irritability
1 Pallor
1 Tachycardia
1 Abdominal distension
1 Decreased peristalsis
1 Painful on deep palpation in mesogastrium
1 Perception of a firm and painful mass
2 Rectal mucus and blood
1 High CRP
1 High D-dimer
1 Anemia
1 Low Hb
2 Acute ISN 0 0 0 2 Surgical reductions of the ISN
1 Rockey–Davis incision for manual reduction
1 Anticoagulant
No failure (n = 2)
No recurrence (n = 2)
(Modified NOS, high)
2 Survived
Moazzam et al., 2020 [29], Pakistan Retrospective case report, single center 4 1 (100) 1 Pakistani 1 No medical history 1 1 1 Ileocolic ISN
AND
1 Abdominal pain
1 Crying
1 Drawing up of the legs towards the abdomen
1 Anorexia
1 Red currant jelly stools
1 Pallor
1 Irritability
1 Sausage-shaped lump
1 Anemia
1 High D-dimer
1 Low Hb
1 Acute ISN 0 0 0 1 Pneumatic reduction of the ISN
1 Antibiotics
1 Analgesics
No failure (n = 1)
No recurrence (n = 1)
(Modified NOS, high)
1 Survived
Noviello et al., 2021 [30], Italy Retrospective case report, single center 7 1 (100) 1 White (Caucasian) 1 No medical history 1 1 1 Ileocolic ISN
AND
1 Abdominal pain
1 Anorexia
1 Diarrhea
1 Vomiting
1 Sleepiness
1 Pallor
1 Lethargy
1 Dehydration
1 Red currant jelly stools
1 High D-dimer 1 Acute ISN
1 Alternating rings of low and high echogenicity
1 “Pseudokidney” sign
1 0 0 1 Hydrostatic reduction of the ISN
1 Laparotomy
1 Surgical resection
1 Anastomosis
Yes failure (hydrostatic, n = 1)
No recurrence (n = 1)
(Modified NOS, high)
1 Survived
Osorno et al., 2021 [31], Colombia Retrospective case report, single center 8 1 (100) 1 Hispanic 1 No medical history 1 1 1 Ileocolic ISN
AND
1 Abdominal pain
1 Red currant jelly stools
1 Perception of a firm and painful mass
1 Metabolic acidosis
1 Peritonitis
1 Not reported 1 Acute ISN
1 Ischemia of distal ileum and right colon
1 0 0 1 Laparotomy
1 Surgical resection
1 Ileostomy
1 Fistula
No failure (n = 1)
No recurrence (n = 1)
(Modified NOS, high)
1 Survived
Ponmani and Hulse 2022 [32], United Kingdom Retrospective case report, single center 18 0 (0) 1 White (Caucasian) 1 No medical history 1 1 1 Ileocolic ISN
AND
1 Constipation
1 Abdominal pain
1 High CRP 1 Acute ISN
1 Doughnut-shaped mass
0 0 0 1 Pneumatic reduction of the ISN
No failure (n = 1)
No recurrence (n = 1)
(Modified NOS, high)
1 survived
Rajalakshmi et al., 2020 [7], India Retrospective case report, single center 8 1 (100) 1 Indian 1 No medical history 1 1 1 Ileocolic ISN
AND
1 Red currant jelly stools
1 Vomiting
1 Lethargy
1 Dehydration
1 Perception of a firm and painful mass
1 Low Hb
1 Low hematocrit
1 Acute ISN 0 0 0 1 IV fluids
1 Pneumatic reduction of the ISN
No failure (n = 1)
No recurrence (n = 1)
(Modified NOS, high)
1 Survived
Rohani et al., 2021 [33], Iran Retrospective case report, single center 72 1 (100) 1 Persian 1 No medical history 1 1 1 Location was not reported
AND
1 Abdominal tenderness
1 Abdominal pain
1 Vomiting
1 Diarrhea
1 Abdominal distension
1 Leukopenia
1 Decreased lymphocytes
1 High calprotectin
1 Hypoalbuminemia
1 Hypocalcemia
1 Hypophosphatemia
1 Hypomagnesaemia
1 Raised liver enzymes
1 Multifocal small bowel loops intussusceptum
1 Pneumatosis intestinalis in ascending colon
1 Dilatation in colon caliber
1 Necrotizing enterocolitis
0 0 0 1 Oral rehydration solution
1 Ondansetron
1 Total parenteral nutrition
1 Antibiotics
No failure (n = 1)
No recurrence (n = 1)
(Modified NOS, high)
1 Survived
Salman et al., 2022 [34], United States Retrospective cohort, single center Median (IQR), 36 (3-216) 19 (79.2) 4 Whites (Caucasians)
6 Hispanics
1 Asian
11 Not reported 685 24 8 Small bowel ISN and 3 ileocolic ISN
AND
7 Vomiting
5 Abdominal pain
2 Blood in stool
4 Red currant jelly stools
11 Not reported 11 Abnormal imaging
3 Acute ISN
11 Not reported 11 Not reported 11 Not reported 3 Pneumatic reductions of the ISN
4 Surgical reductions of the ISN
No failure (n = 8)
Yes failure (pneumatic, n = 3)
No recurrence (n = 11)
(NOS, 7)
11 Survived
Saxena et al., 2021 [35], United Kingdom Retrospective case report, single center 10 0 (0) 1 White (Caucasian) 1 No medical history 1 1 1 Location was not reported
AND
1 Red currant jelly stools
1 Vomiting
1 Not reported 1 Acute ISN
1 Waugh syndrome (ISN with malrotation)
0 0 0 1 Pneumatic reduction of the ISN
1 Surgical reduction of the ISN
1 Ladd’s procedure
Yes failure (pneumatic, n = 1)
No recurrence (n = 1)
(Modified NOS, high)
1 Survived
Scottoni et al., 2022 [36], Italy Retrospective case reports, multicenter 1 and 5.5 1 (50) 2 Whites (Caucasians) 1 No medical history
1 Hyperinsulinism
2 2 2 Ileocolic ISN
AND
1 Constipation
2 Vomiting
2 Lethargy
1 Dehydration
2 Blood in stool
1 Anorexia
2 Not reported 2 Acute ISN
1 Enlarged lymph nodes
1 Necrosis of the terminal ileum to the splenic flexure
1 1 1 1 Pneumatic reduction of the ISN
1 Laparotomy
1 Removal of lymph node
1 Hemicolectomy 1 Anastomosis
1 Noradrenaline
No failure (n = 1)
Yes failure (pneumatic, n = 1)
No recurrence (n = 2)
(Modified NOS, high)
2 Survived
Sorkhi et al., 2022 [37], Iran Retrospective case report, single center 132 1 (100) 1 Persian 1 Nephrotic syndrome
1 Long use of steroid (15 years)
1 1 1 Ileocolic ISN
AND
1 Abdominal pain
1 Vomiting
1 Nausea
1 Weakness
1 Anorexia
1 Myalgia
1 Pallor
1 Dehydration
1 High leukocytes
1 Hypernatremia
1 Hypokalemia
1 Acute ISN
1 Meckel’s diverticulum
0 0 0 1 Steroids
1 Enalapril
1 Pantoprazole
1 Antibiotics
1 IV fluids
1 Hydrostatic reduction of the ISN
1 Diverticulectomy
No failure (n = 1)
No recurrence (n = 1)
(Modified NOS, moderate)
1 Survived
Stephenson et al., 2021 [38], United States Retrospective case report, single center 6 1 (100) 1 White (Caucasian) 1 No medical history 1 1 1 Ileocolic ISN
AND
1 Abdominal pain
1 Vomiting
1 Irritability
1 Red currant jelly stools
1 Not reported 1 Acute ISN 0 0 0 1 Pneumatic reduction of the ISN
Yes failure (pneumatic, n = 1)
Yes recurrence (n = 1)
(Modified NOS, high)
1 Survived
Sullivan et al., 2021 [39], United States Retrospective case report, single center 7 1 (100) 1 White (Caucasian) 1 No medical history 1 1 1 Ileal-ileal ISN and 1 ileocolic ISN
AND
1 Abdominal pain
1 Crying
1 Fist clenching
1 Grimacing
1 Not reported 1 Acute ISN
1 Ileocolic ISN (Target sign)
0 0 0 1 Hydrostatic reduction of the ISN
Yes failure (hydrostatic, n = 1)
Yes recurrence (n = 1)
(Modified NOS, high)
1 Survived
Swyden et al., 2022 [40], United States Retrospective case report, single center 4 1 (100) 1 White (Caucasian) 1 No medical history 1 1 1 Ileocolic ISN
AND
1 Blood in stool
1 Anorexia
1 Red currant jelly stools
1 Tachycardia
1 Lethargy
1 Metabolic acidosis
1 Thrombocytosis
1 High leukocytes
1 Hypochloremia
1 Raised procalcitonin
1 Acute ISN
1 Doughnut-shaped mass 1 Pneumoperitoneum
0 0 0 1 IV fluids
1 Hydrostatic reduction of the ISN
1 Laparotomy
Yes failure (hydrostatic, n = 1)
No recurrence (n = 1)
(Modified NOS, high)
1 Survived
Tran et al., 2022 [41], United States Retrospective case report, single center 8 0 (0) 1 White (Caucasian) 1 No medical history 1 1 1 Location was not reported
AND
1 Blood in stool
1 Rash
1 Diarrhea
1 Metabolic acidosis
1 High leukocytes
1 High CRP
1 Acute ISN (target sign) 0 0 0 1 No treatment for ISN (follow-up and bowel rest)
No failure (n = 1)
No recurrence (n = 1)
(Modified NOS, moderate)
1 Survived
Vecchio et al., 2021 [42], Italy Retrospective cohort, multicenter 4 Not reported 4 Not reported 4 Whites (Caucasians) 4 Not reported 685 4 1 Ileal ISN and 3 ileocolic ISN
AND
4 Abdominal pain
4 Vomiting
4 Red currant jelly stools
4 Not reported 4 Not reported 4 Not reported 4 Not reported 4 Not reported 2 Surgical reductions of the ISN
1 Removal of solid mass
Failure was not reported (n = 4)
Recurrence was not reported (n = 4)
(NOS, 8)
4 Not reported
Wang et al., 2021 [43], China Retrospective cohort, single center 10 0 (0) 1 Asian 1 No medical history 238 1 1 Location was not reported
AND
1 Blood in stool
1 Vomiting
1 Diarrhea
1 Oliguria
1 Acute kidney injury (stage 3)
1 Raised procalcitonin
1 High CRP
1 High interleukin-6
1 High D-dimer
1 High LDH
1 High BUN
1 High serum creatinine
1 Low estimated glomerular filtration rate
1 Proteinuria 1 Hematuria
1 Acute ISN
1 Intestinal necrosis
1 1 1 1 Surgical reduction of the ISN
1 Antibiotics
1 Antivirals
1 Steroids
1 IVIG
1 CRRT
1 Plasma exchange
Yes failure (surgical, n = 1)
No recurrence (n = 1)
(NOS, 7)
1 Died
Yalçınkaya et al., 2021 [44], Turkey Retrospective cohort, single center 72 0 (0) 1 White (Caucasian) 1 No medical history 1 1 1 Ileo-ileal ISN
AND
1 Diarrhea
1 Abdominal tenderness
1 Abdominal pain
1 Conjunctivitis
1 Tachycardia
1 Abdominal tenderness
1 Blood in stool
1 Mitral regurgitation
1 Left ventricular systolic dysfunction
1 High CRP
1 Raised ESR
1 Raised procalcitonin
1 High interleukin-6
1 High ferritin
1 High fibrinogen
1 Decreased lymphocytes
1 Acute ISN
1 Fluid retention in the ileal and colonic walls
0 0 0 1 IVIG
1 Steroids
1 No treatment for ISN (follow-up and bowel rest)
No failure (n = 1)
No recurrence (n = 1)
(NOS, 7)
1 Survived

APTT, activated partial thromboplastin time; ARDs, acute respiratory distress syndrome; BP, blood pressure; BUN, blood urea nitrogen; COVID-19, coronavirus disease 2019; CRRT, continuous renal replacement therapy; CRP, C-reactive protein; DIC, disseminated intravascular coagulation; ESR, erythrocyte sedimentation rate; Hb, hemoglobin; ICU, intensive care unit; ISN, intussusception; IQR, interquartile range; IV, intravenous; IVIG, IV immunoglobulin; LDH, lactate dehydrogenase; NGT, nasogastric tube; NOS, Newcastle-Ottawa Scale; NT-proBNP, N-terminal pro b-type natriuretic peptide; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2; WBCs, white blood cells; WHO, World Health Organization. a Data are presented as the median (25th–75th percentiles).