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Vitamin D Status and its Relationship with Thyroid Function Parameters in Patients with Hypothyroidism
Mojtaba Zare Ebrahimabad , Hanieh Teymoori, Hamidreza Joshaghani,
Volume 13, Issue 5 (9-2019)
Abstract
ABSTRACT
            Background and Objectives: Vitamin D is an essential secosteroid that plays a crucial role in the homeostasis of a few mineral elements, particularly calcium. Since vitamin D deficiency and thyroid diseases are two important global health problems, we aimed to investigate a possible relationship of vitamin D and calcium levels with hypothyroidism in an Iranian population.
            Methods: This case-control study was conducted on 175 subjects with hypothyroidism (75 males and 100 females) and 175 euthyroid controls (85 males and 90 females) who were referred to a laboratory in Gorgan, Iran. Serum levels of 25-hydroxyvitamin D, calcium, thyroid-stimulating hormone (TSH), free triiodothyronine (free T3) and thyroxine (total T4) were measured in all participants.
            Results: Vitamin D and calcium were significantly lower in patients with hypothyroidism (P<0.0001). Free T3 and calcium levels differed significantly among hypothyroid patients based on their vitamin D status (P<0.0001), but vitamin D levels were within sufficient range in all groups. Moreover, there was a positive correlation between free T3 with vitamin D (r= 0.337, P<0.0001) and calcium (r= 0.361, P<0.0001) levels.
            Conclusions: Our results suggest that there may be a relationship between decreased vitamin D levels and thyroid function parameters.
            Keywords: Vitamin D Deficiency, Hypocalcemia, Hypothyroidism, Thyrotropin, Thyroxine.

Incidence of Phototherapy Induced Hypocalcemia In Neonates With Hyperbilirubinemia
Dr Mazhar Khan, Dr Akash Sarkate, Dr Poonam Wade, Dr Sushama Mailk,
Volume 19, Issue 2 (3-2025)
Abstract
ABSTRACT
Objective: The aim of the work is to study the effect of phototherapy on serum calcium level in neonates with hyperbilirubinemia .
Methods: It was an observational study, conducted in the NICU of BYL & T.N. Medical college, Mumbai over a period of 12 months after obtaining permission from institutional ethics committee . This study was performed on 100 neonates (>34 weeks of gestational age) with hyperbilirubinemia managed with phototherapy. A sample of blood was sent to the laboratory for serum calcium level before initiating phototherapy and after completion of  phototherapy. All the neonates were clinically assessed for clinical features of hypocalcemia . All the data were recorded in the preformed proforma. Data was analysed using SPSS version 27. P value <0.05 was taken as significant.
Results: The mean age of the neonates was 3±1.2 days .Mean gestational age at the time of birth was 37±1.2 weeks. Mean duration of jaundice was 2.8±1.10 days. The median serum calcium (mg/dL) level before phototherapy was 8.6 (8.49–8.61). After phototherapy, the median serum calcium (mg/dL) levels were reduced to 7.35 (7.33–7.50), which was significant (p<0.001). Hypocalcemia was defined as a serum calcium level of 8 mg/dL, and the incidence of hypocalcemia in the study population was 16%. 60% of new-borns with hypocalcemia experienced mild symptoms like jitteriness or irritability.
Conclusion: The Incidence of hypocalcemia is significant in the jaundiced neonates treated with phototherapy. One needs to be watchful in dealing neonates in NICU while serial monitoring for hypocalcemia and its complications.
 
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