|Year : 2012 | Volume
| Issue : 3 | Page : 99-103
Persistent hyperinsulinemic hypoglycemia of infancy: An overview of current concepts
Prabudh Goel, Subhasis Roy Choudhury
Department of Pediatric Surgery, Lady Hardinge Medical College and Associated Kalawati Saran Children's Hospital, New Delhi, India
|Date of Web Publication||6-Jul-2012|
Subhasis Roy Choudhury
Department of Pediatric Surgery, Lady Hardinge Medical College and Kalawati Saran Children's Hospital, New Delhi - 110 001
Source of Support: None, Conflict of Interest: None
| Abstract|| |
Persistent hyperinsulinemic hypoglycemia of infancy (PHHI) is relatively rare but one of the most important causes of severe neonatal hypoglycemia. Recognition of this entity becomes important due to the fact that the hypoglycemia is so severe and frequent that it may lead to severe neurological damage in the infant manifesting as mental or psychomotor retardation or even a life-threatening event if not recognized and treated effectively in time. Near-total pancreatectomy may be required for patients with intractable hypoglycemia despite medical treatment; however, that may result in diabetes mellitus or recurrent postoperative hypoglycemia. This review aims to consolidate the traditional concepts and current information related to the pathogenesis and management of PHHI.
Keywords: Hypoglycemia of infancy, near-total pancreatectomy, nesidioblastosis
|How to cite this article:|
Goel P, Choudhury SR. Persistent hyperinsulinemic hypoglycemia of infancy: An overview of current concepts. J Indian Assoc Pediatr Surg 2012;17:99-103
|How to cite this URL:|
Goel P, Choudhury SR. Persistent hyperinsulinemic hypoglycemia of infancy: An overview of current concepts. J Indian Assoc Pediatr Surg [serial online] 2012 [cited 2018 May 28];17:99-103. Available from: http://www.jiaps.com/text.asp?2012/17/3/99/98119
| Introduction|| |
Transient, symptomatic hypoglycemia is the most common metabolic abnormality in the neonates and is seen in 4 per 1000 term infants and 6 per 1000 premature infants. However, 1% of these infants have sustained or repeated episodes of hypoglycemia and call for prompt recognition and management. Persistent hyperinsulinemic hypoglycemia of infancy (PHHI), though rare, is the most common cause of neonatal hypoglycemia persisting beyond the first few hours of life.
Laidlaw  in 1938 coined the term nesidioblastosis based on his understanding of a diffuse ducto-endocrine β cell proliferative disorder of the pancreas in a patient with a β cell tumor. The term nesidioblastoma was derived from the Greek words nesidion (islet) and blastos (germ) and was proposed for an islet cell adenoma. Brown and Young  associated severe infantile hypoglycemia with nesidioblastosis. The term nesidiodysplasia was proposed to signify the overpopulation of the pancreas with the β cells coupled with their maldistribution and malregulated function.  The designation PPHI was proposed by Glaser  in 1989 and has been accepted in the recent literature replacing all other terms used previously. The term incorporated the focal and diffuse pancreatic involvement associated with hyperinsulinism and hypoglycemia.
| Incidence|| |
PHHI occurs sporadically in 1:50,000 live births in a random mating population. The incidence can be as high as 1:2500 in communities with significant inbreeding. The proposed mode of inheritance is autosomal recessive. Familial PHHI was reported for the first time by Woo et al., , in a Greek Cypriots family. Usually patients affected with PHHI have healthy parents. The male to female ratio is 1.2:1 for diffuse lesions and 1.8:1 for focal lesions. The most common age for presentation is the neonate and infant. Presentation beyond the age of 2 years is rare.
| Pathology and Pathogenesis|| |
Inappropriate secretion of insulin could be explained by a defect at three levels, viz., defect in the β cells of the pancreas, faulty intracellular signaling responsible for normal islet cell function in the presence of normal β cells,  or overpopulation of β cells in the pancreatic tissue.  Nesidioblastosis is characterized by the presence of islets in increased numbers throughout the pancreatic lobule in addition to the Islets of Langerhans More Details. These islet cells may be present as single cells or in clusters. The histological appearance closely resembles that of third trimester fetal and neonatal pancreas. Resnick and Manivel  demonstrated similar histopathology in anterior mediastinal and sacrococcygeal teratoma. De novo formation of intermediate cells (acinar islet cells) has also been associated with nesidioblastosis.
The histopathology of PHHI is heterogeneous and is hallmarked by the presence of ductoendocrine proliferation, supernumerary small endocrine groups, and large endocrine areas.  Broadly speaking, two patterns can be distinguished, viz., focal and diffuse. The focal adenomatous hyperplasia, as the name signifies, is characterized by the presence of abnormal β cells in one or more focal areas inside the pancreatic tissue. It is encountered in about 40% of the cases of PHHI. The lesion measures about 2.5-7.5 mm in diameter. The diffuse form of the disease shows the presence of abnormal β cells in all sections of the pancreas.
| Molecular Basis of the Disease|| |
The most widely accepted hypothesis for the development of PHHI is the presence of dysfunction of the ATP-dependent potassium channels in the β cells of the pancreas. , Focal PHHI is associated with hemizygosity or homozygosity of a paternally inherited mutation of the SUR gene or the inwardly rectifying potassium channel genes and loss of the maternal allele in the hyperplastic islets. , The SUR gene belongs to the ATP binding cassette super family and the SUR protein is a putative subunit of the β cell ATP-sensitive potassium channel. The gene has been mapped to 11p15.1 by fluorescence in situ hybridization.  The presence of a diffuse lesion involves the genes encoding the sulfonylurea receptor or the inwardly rectifying potassium in recessively inherited hyperinsulinism. , The transmission could infrequently be dominant  and involves the glucokinase gene  or other loci  such as the glutamate dehydrogenase gene. 
Autoantibodies  with a doubtful significance have also been demonstrated in the serum of patients with PHHI. It is yet not clear whether these antibodies are the result of the release of islet antigens in response to the proliferative process or they have a pathogenic role by acting as growth factors. A new pituitary protein 7B2 has been reported to be elevated in patients with PHHI and may have a marker role in facilitating the diagnosis. 
| Clinical Spectrum|| |
Majority of the babies are macrosomic at birth with a mean birth weight of 3.7 kg. Mild to moderate hepatomegaly is usually present. Symptoms of hypoglycemia appear within 72 h of birth. The presentation includes hunger, jitteriness, lethargy, apnea, and seizures. Seizures are generalized tonic-clonic and present in one half of the cases.  Tremors, hypotonia, cyanosis, and hypothermia are not infrequent. Older children may also present with diaphoresis, confusion, and unusual mood or behavioral changes. Facies typical of hyperinsulinism include high forehead, large and bullous nose with a short columella, smooth philtrum, and a thin upper lip.
The hypoglycemia is severe and permanent (both fasting and postprandial). Usually, the blood glucose levels at the time of first presentation are very low (<18 mg/dL). Frequent or continuous glucose infusion or feeding is required to maintain adequate blood glucose levels. These children are highly susceptible to develop neurological damage, psychomotor retardation, and even death.
| Diagnosis of Persistent Hyperinsulinemic Hypoglycemia of Infancy|| |
The diagnostic criteria for PHHI have been enumerated in [Table 1]. The insulin to glucose ratio is elevated (0.4-2.7) in patients with PHHI. In case of diagnostic dilemma, the patient may be further evaluated for levels of ketone bodies, free fatty acids, and branched chain amino acids after a fasting period of 4-6 h.
|Table 1: Diagnostic criteria for persistent hyperinsulinemic hypoglycemia of infancy|
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| Management of Persistent Hyperinsulinemic Hypoglycemia of Infancy|| |
Nearly all patients require high rates of glucose infusion. Continuous feeding with a glucose polymer orally or through a nasogastric drip is recommended to maintain the blood glucose levels. Feeding should continue even during sleep. A good venous access must always be secured with a wide bore intravenous canula. A central venous catheter is desirable to support the high rates of glucose infusion. The medical management comprises of three drug categories [Table 2].
|Table 2: Drugs used for Persistent hyperinsulinemic hypoglycemia of infancy|
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Glucagon or somatostatin may be added to the glucose drip if the blood glucose is unstable despite high rates of glucose infusion. Glucagon has a transient effect but is useful in emergency situations such as the time while looking out for a fresh intravenous access. Somatostatin is the only hormone in the normal islet of Langerhans which has an inhibitory effect on the glucose-mediated release of insulin. Concurrent administration of somatostatin abolishes the insulin-stimulating effect of glucose being administered to address the hypoglycemia.
Diazoxide has been used as a first-line drug. Diazoxide causes hyperglycemia by stimulating the secretion of catecholamines and mobilization of glycogen. This inhibits the release of insulin with resultant hyperglycemia. The efficacy of diazoxide has been described in terms of normalization of the blood glucose levels (>54 gm/dL), both fasting and postprandial, in patients who are on normal diet, physiological overnight fast, and off intravenous supplementation for at least 5 days. Any patient who demonstrated two episodes of hypoglycemia in any 24 h would be labeled as diazoxide unresponsive. Unfortunately, 90% of the neonatal forms of PHHI are resistant to diazoxide.
Octreotide is used in patients with diazoxide unresponsiveness. High doses could worsen hypoglycemia paradoxically by suppressing the secretion of glucagon and growth hormone.
Calcium-channel blockers like nifedipine have also been reported to be of some use. ,, Cornblath and Schwartz  suggested the role of long-acting adrenaline in the initial diagnostic-therapeutic evaluation of severe neonatal hypoglycemia based on its direct inhibitory effect on the β cells of islets of Langerhans. Streptozotocin has been known to selectively destroy the insulin-secreting cells and induces diabetes mellitus in experimental animals. However, due to its toxicity, its use is precluded in the neonates.
| Differentiation Between Focal and Diffuse Forms of Persistent Hyperinsulinemic Hypoglycemia of Infancy|| |
The clinical presentation, biochemical profile of the patient, and conventional imaging modalities do not show whether the hyperinsulinism is due to a discrete adenoma or to a more diffuse form of nesidioblastosis.
Genetic analysis  has shown that focal PHHI is associated with loss of heterozygosity for paternally inherited mutations in the Katp genes.  On the other hand, children with diffuse PHHI have homozygous recessive or compound heterozygote mutations in the ABCC8 and KCNJ11 genes. Percutaneous transhepatic pancreatic venous catheterization with sampling and pancreatic arteriography  has been currently replaced by [18-F]-L-DOPA Positron Emission Tomography (PET) scan.
In diffuse PHHI, the PET scan shows uniform uptake of [18-F]-L-DOPA throughout the pancreas. In focal PHHI, the uptake of [18-F]-L-DOPA is concentrated within the foci of the disease. Intraoperative ultrasonic real-time navigation permits imaging of the focal lesion. It is also possible to delineate important anatomic landmarks such as the blood vessels and the relationship of the main pancreatic duct and the intrapancreatic common bile duct to the pancreatic foci. It also helps the surgeon to enucleate the entire focus while preserving the healthy pancreatic tissue. 
Intraoperative biopsy followed by a frozen section also helps differentiate between the focal and diffuse forms of the disease and defines the limits of surgical resection in cases with focal pathology.
| Surgical Management|| |
Indications of surgery include:
The optimal extent of resection of pancreas has been a matter of controversy. The first report on major pancreatic resection for intractable hypoglycemia was by Graham and Hartman  as early as 1934. Gross  in 1953 reported on 65% pancreatic resection (lateral to the superior mesenteric vessels). However, the procedure was inherent with the problem of recurrent hypoglycemia requiring reoperation or continued medical therapy. Harken et al.,  suggested duodenum preserving total extirpation of the pancreas to address this issue. Localized resection of discretely palpable pancreatic nodules was suggested by Ravitch and Thomas. , There was a gradual shift in opinion towards 80-90% pancreatic resection, ,, which involved removal of all pancreatic tissue distal to the right side of the superior mesenteric vessels. This is associated with a 25-50% incidence of recurrent hypoglycemia. Schiller et al.,  added resection of the medial third of the pancreatic head and the uncinate process.
- failure of medical management;
- presence of a focal lesion which is amenable to surgical resection;
- poor compliance to medical management.
Recent literature supports near-total pancreatectomy as the definitive management option for diffuse PHHI. Kramer et al.,  and Moazam et al.,  have separately shown the efficacy of "near-total" pancreatectomy and shown it to be the procedure of choice in infants and neonates. Near-total pancreatectomy incorporates removal of the tail, body, uncinate process, and part of the pancreatic head. A rim of pancreatic tissue surrounding the common bile duct and along the duodenum is left behind. It has also been suggested that up to 98% of pancreatectomy may be required in refractory cases. Only small islands of pancreatic tissue are left along the pancreaticoduodenal arcade bordering the duodenum.
In patients with focal PHHI, a localized resection of the focal lesion is curative. Lesions of the pancreatic head and neck mandate open resection of the lesion with a small rim of surrounding normal tissue followed by a pancreatico-jejunostomy to drain the distal part of the pancreas. Lesions situated more distally may be managed with distal pancreatectomy.
Laparoscopic pancreatectomy  is associated with decreased blood loss, morbidity, and hospital stay. Cryopreservation of the islet cells followed by autotransplantation holds some promise against the subsequent development of diabetes mellitus.
| Postoperative Management|| |
Surgery for nesidioblastosis represents an acute transition from a hyperinsulinimic state to a diabetic status. The patient should be kept on a continuous intravenous glucose drip accompanied by regular blood glucose monitoring. Most of the patients would need to be started on an insulin drip within the first 3 to 6 h to prevent glucose-induced diuresis. Patients should be started on alimentary feeds as soon the ileus has resolved. Once the oral alimentation is well established, the patients should be shifted to intermittent subcutaneous injections of insulin.
| Long-term Outcomes|| |
Leibowitz et al., reported that 6 out of 14 patients treated with subtotal pancreatectomy developed diabetes before puberty as against none in the medically managed group.  The Children's Hospital of Philadelphia  reported experience of more than 250 cases of hyperinsulinism of infancy over the past 10 years. More than 50% of the lesions were found in the head of the pancreas (focal involvement). The extent of pancreatectomy in their series varied from 5% to 98%, most involved more than 50% resections. More than 90% of the focal hyperinsulinism cases were proven to be cured after surgery. However, in cases of diffuse hyperinsulinism, approximately 50% of the cases continued to have hypoglycemia after surgery which was managed medically. Another 25% of the cases were well controlled with no need for added medications and another one-fourth of the cases of diffuse hyperinsulinism managed surgically showed signs of insulin deficiency and required insulin replacement therapy.
| Conclusion|| |
With the deeper understanding of the disease process and the recent advances in imaging and surgical techniques, it is now possible to cure focal forms of PHHI completely. However, the management of diffuse PHHI is still a matter of great controversy. It is a double edged sword wherein delay in treatment may lead to developmental delay, epilepsy, and mental retardation, while near-total pancreatectomy is associated with the problems of recurrent postoperative hypoglycemia and diabetes mellitus in the long term.  In intractable cases, surgery if not curative helps in making the disease more manageable.
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[Table 1], [Table 2]
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