BACKGROUND AND OBJECTIVE

Transient congenital hypothyroidism (TCH) refers to temporary deficiency of thyroid hormone identified after birth which later recovers to improved thyroxine production. Its prevalence in the Philippines has not been reported in a large-scale study. Its diagnosis remains difficult due to its numerous possible etiologies. Identifying the predictive factors of TCH may aid in earlier diagnosis and decreased risk of overtreatment. This study aimed to determine the predictive factors for TCH in children with congenital hypothyroidism (CH) detected by newborn screening (NBS) in the Philippines from January 2010 to December 2017.

METHODS

In this multicenter retrospective cohort study involving 15 NBS continuity clinics in the Philippines, medical records were reviewed, and clinical and laboratory factors were compared between children with TCH and those with permanent congenital hypothyroidism (PCH). Of the 2,913 children diagnosed with CH in the Philippines from 2010 to 2017, 1,163 (39.92%) were excluded from the study due to an unrecalled or lost to follow-up status, or a concomitant diagnosis of Down Syndrome.

RESULTS

Among the 1,750 patients included in analysis, 6.97% were diagnosed with TCH, 60.80% were female, mean gestational age at birth was 38 weeks, and mean birth weight was 2,841 grams. Confirmatory thyrotropin (TSH) was lower and confirmatory free thyroxine (FT4) was higher in the TCH group compared to those with PCH (TSH 32.80 vs 86.65 µIU/mL [p < 0.0001]; FT4 9.90 vs 7.37 pmol/L [p 0.001]). The TCH group required lower L-thyroxine doses compared to the PCH group at treatment initiation and at 1, 2, and 3 years of age (initial 6.98 vs 12.08 µg/ kg/day [p < 0.0001]; at 1 year 1.89 vs 4.11 µg/kg/day [p < 0.0001]; at 2 years 1.21 vs 3.72 µg/kg/day [p < 0.0001]; at 3 years 0.83 vs 3.45 µg/kg/day [p < 0.0001]). Among those with TCH, mean serum TSH decreased significantly after treatment with L-thyroxine (32.80 vs. 6.55 µIU/ mL, p 0.0001). Other factors associated with TCH were results of thyroid ultrasonography (p 0.007), gestational age at birth (p 0.02), and maternal history of thyroid illness (p < 0.0001).

CONCLUSION

Of all the patients with confirmed congenital hypothyroidism via the newborn screening, 6.97% were diagnosed with transient CH. Factors associated with TCH are confirmatory TSH and FT4, L-thyroxine dose requirements, thyroid ultrasound findings, gestational age at birth, and a maternal history of thyroid illness.

Human ; Congenital Hypothyroidism ; Philippines ; Neonatal Screening ; Prevalence

BACKGROUND

Six-pyruvoyl-tetrahydrobiopterin synthase (6-PTPS) deficiency is an inherited metabolic disorder which results in tetrahydrobiopterin (BH4) deficiency causing hyperphenylalaninemia.

OBJECTIVE

This study aimed to describe the clinical, biochemical, and radiologic profiles, and neurologic and developmental outcomes of patients diagnosed with 6-pyruvoyl tetrahydrobiopterin (PTPS) deficiency through newborn screening and confirmed by BH4 loading test, pterin analysis, and gene sequencing who were following-up with the metabolic team.

METHODS

The research was a single-center descriptive case series study design that was done at the Philippine General Hospital, a tertiary government hospital. The clinical, biochemical, radiologic profiles and neurodevelopmental evaluation of each patient were described.

RESULTS

Nine patients from 1 year 2 months to 14 years 5 months of age were enrolled in the study. Clinical manifestations before treatment were hypotonia, poor suck, and seizure. The most common clinical manifestation even after treatment initiation was seizure. The mean phenylalanine level on newborn screening was 990.68 umol/L, but after treatment was started, mean levels ranged from 75.69 to 385.09 umol/L. Two of the patients had focal atrophy of the posterior lobe on brain imaging. Pathogenic variants on molecular analysis were all missense, with two predominant variants, c.155A>G and c.58T>C. Eight of the nine patients had varying degrees of developmental delay or intellectual disability, while the remaining patient had signs of a learning disorder.

CONCLUSION

Newborn screening has played a crucial role in the early identification and management of patients with hyperphenylalaninemia due to 6-PTPS deficiency. Confirmation of diagnosis through determination of DHPR activity, urine pterins and/or molecular analysis is necessary for appropriate management. However, despite early initiation of treatment, neurodevelopmental findings of patients with 6-PTPS deficiency were still unsatisfactory.

Human ; Infant: 1-23 Months ; Child Preschool: 2-5 Yrs Old ; Child: 6-12 Yrs Old ; Adolescent: 13-18 Yrs Old ; Learning Disorders ; Brain ; Diagnosis

BACKGROUND AND OBJECTIVE

Transient congenital hypothyroidism (TCH) refers to temporary deficiency of thyroid hormone identified after birth which later recovers to improved thyroxine production. Its prevalence in the Philippines has not been reported in a large-scale study. Its diagnosis remains difficult due to its numerous possible etiologies. Identifying the predictive factors of TCH may aid in earlier diagnosis and decreased risk of overtreatment. This study aimed to determine the predictive factors for TCH in children with congenital hypothyroidism (CH) detected by newborn screening (NBS) in the Philippines from January 2010 to December 2017.

METHODS

In this multicenter retrospective cohort study involving 15 NBS continuity clinics in the Philippines, medical records were reviewed, and clinical and laboratory factors were compared between children with TCH and those with permanent congenital hypothyroidism (PCH). Of the 2,913 children diagnosed with CH in the Philippines from 2010 to 2017, 1,163 (39.92%) were excluded from the study due to an unrecalled or lost to follow-up status, or a concomitant diagnosis of Down Syndrome.

RESULTS

Among the 1,750 patients included in analysis, 6.97% were diagnosed with TCH, 60.80% were female, mean gestational age at birth was 38 weeks, and mean birth weight was 2,841 grams. Confirmatory thyrotropin (TSH) was lower and confirmatory free thyroxine (FT4) was higher in the TCH group compared to those with PCH (TSH 32.80 vs 86.65 µIU/mL [pCONCLUSION

Of all the patients with confirmed congenital hypothyroidism via the newborn screening, 6.97% were diagnosed with transient CH. Factors associated with TCH are confirmatory TSH and FT4, L-thyroxine dose requirements, thyroid ultrasound findings, gestational age at birth, and a maternal history of thyroid illness.

Human ; Congenital Hypothyroidism ; Philippines ; Neonatal Screening ; Prevalence

Background: Six-pyruvoyl-tetrahydrobiopterin synthase (6-PTPS) deficiency is an inherited metabolic disorder which results in tetrahydrobiopterin (BH4) deficiency causing hyperphenylalaninemia. Objective: This study aimed to describe the clinical, biochemical, and radiologic profiles, and neurologic and developmental outcomes of patients diagnosed with 6-pyruvoyl tetrahydrobiopterin (PTPS) deficiency through newborn screening and confirmed by BH4 loading test, pterin analysis, and gene sequencing who were following-up with the metabolic team. Methods: The research was a single-center descriptive case series study design that was done at the Philippine General Hospital, a tertiary government hospital. The clinical, biochemical, radiologic profiles and neurodevelopmental evaluation of each patient were described. Results: Nine patients from 1 year 2 months to 14 years 5 months of age were enrolled in the study. Clinical manifestations before treatment were hypotonia, poor suck, and seizure. The most common clinical manifestation even after treatment initiation was seizure. The mean phenylalanine level on newborn screening was 990.68 umol/L, but after treatment was started, mean levels ranged from 75.69 to 385.09 umol/L. Two of the patients had focal atrophy of the posterior lobe on brain imaging. Pathogenic variants on molecular analysis were all missense, with two predominant variants, c.155A>G and c.58T>C. Eight of the nine patients had varying degrees of developmental delay or intellectual disability, while the remaining patient had signs of a learning disorder. Conclusion Newborn screening has played a crucial role in the early identification and management of patients with hyperphenylalaninemia due to 6-PTPS deficiency. Confirmation of diagnosis through determination of DHPR activity, urine pterins and/or molecular analysis is necessary for appropriate management. However, despite early initiation of treatment, neurodevelopmental findings of patients with 6-PTPS deficiency were still unsatisfactory.

Background: Disorders of Sex Development (DSD) are conditions that arise from an abnormality of the typical structural, chromosomal and/or gonadal characteristics of sex development. The incidence of DSD is not well established in the Philippines and there is no published local data. The complex nature of DSD requires streamlined multidisciplinary team management and guidelines from the 2006 Consensus meeting have become the standard of care for patients. Objective: The study describes the phenotype, biochemical, diagnostic and management profiles of patients with Disorders of Sex Development (DSD) excluding congenital adrenal hyperplasia (CAH) at the Philippine General Hospital, a tertiary care medical facility. Methods: Medical records of patients with DSD seen at the Division of Clinical Genetics from 2012-2016 were reviewed. Histories, demographic profiles, clinical features, co-existing health conditions, laboratory, imaging results, and interventions (medical or surgical) were recorded into a clinical report form. Results: Fifty-five (55) patient charts were included of all the patients with DSD listed in the registry. The neonatal period was the most common time DSD was first noted (69.09%). Most (58.18%) were assigned the male sex. The most common genital anomalies were hypospadias (45.45%), cryptorchidism (21.82%), and micropenis (12.73%). Associated health conditions included multiple congenital anomalies (32.73%), genitourinary with or without gastrointestinal anomalies (16.36%) and dysmorphic features (12.73%). Among 28 patients with karyotypes, there were 12 patients with sex chromosome DSD; two 46, XX DSD and fourteen 46, XY DSD. Four patients were prescribed hydrocortisone, three of whom had higher levels of 17-OH progesterone beyond cut-off level (2 preterm, 1 full term) while 1 full term presented with genital ambiguity; one case of Klinefelter syndrome was given testosterone replacement. Ten patients underwent corrective surgery for urogenital anomalies. Repair of hypospadias was the most common procedure. Repairs of associated anomalies (neurologic, cardiac, gastrointestinal, genitourinary) were done in 6 patients. Conclusion Complete history, meticulous physical examination and comprehensive investigations are important for the confirmation of DSDs. Uniform classification, use of standardized terminology, and proper documentation of findings are crucial for the integrated and appropriate management of these patients.
Disorders of Sex Development

Saving babies from mental retardation and death is the aim of the newborn screening program. A complex process of sample collection, processing and feedback is undertaken before reaching this goal. As with other systems, the newborn screening program is not perfect and periodic review is needed to continually improve services. Using maple syrup urine disease (which is the most common inborn error of metabolism detected through newborn screening) as an index case, this paper aims to present the gaps in diagnosis and management by citing cases and providing a commentary.
Maple Syrup Urine Disease ; Neonatal Screening

Glycogen storage disease (GSD) type IXa, due to a deficiency of hepatic phosphorylase b kinase, results in liver enlargement, growth retardation and fasting ketosis. Many are asymptomatic and do not require treatment. This is the first documented GSD IXa in a Filipino boy evaluated for short stature.
Glycogen Storage Disease ; Hepatomegaly