Displaying publications 1 - 20 of 27 in total

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  1. Loh HH, Tan F
    Med J Malaysia, 2013 Aug;68(4):372-3.
    PMID: 24145274 MyJurnal
    Pancytopenia can rarely complicate Grave's disease. It can be due to uncontrolled thyrotoxicosis or as a result of rare side effect of antithyroid medication. Pernicious anemia leading to Vitamin B12 deficiency is another rare associated cause. We report a case of a patient with Grave's disease and undiagnosed pernicious anemia whom was assumed to have antithyroid drug induced pancytopenia. Failure to recognize this rare association of pernicious anemia as a cause of pancytopenia had resulted in delay in treatment and neurological complication in our patient.
  2. Loh HH, Sukor N
    J Hum Hypertens, 2020 01;34(1):5-15.
    PMID: 31822780 DOI: 10.1038/s41371-019-0294-8
    Primary aldosteronism (PA), the most common cause of secondary hypertension, is a well-recognized condition that can lead to cardiovascular and renal complications. PA is frequently left undiagnosed and untreated, leading to aldosterone-specific morbidity and mortality. In this review we highlight the evidence linking PA with other conditions such as (i) diabetes mellitus, (ii) obstructive sleep apnea, and (iii) bone health, along with clinical implications and proposed underlying mechanisms.
  3. Loh HH, Sukor N
    Clin Respir J, 2023 Feb 06.
    PMID: 36746181 DOI: 10.1111/crj.13593
    Obstructive sleep apnea and vitamin D deficiency are associated with multiple complications with increased morbidity and mortality. However, the relationship between these two entities remains unclear, with clinical studies demonstrating contradictory results. This narrative review aims to present the current evidence and understanding of this relationship and discuss the possible mechanisms linking these two disease entities. Finally, we summarize and propose areas of opportunity for future research.
  4. Loh HH, Mohd Noor N
    Case Rep Crit Care, 2014;2014:140906.
    PMID: 24829837 DOI: 10.1155/2014/140906
    Parathyroid carcinoma is a rare cause of hypercalcemia. Hypercalcemic crisis is a medical emergency. Hemodialysis is rarely needed to treat hypercalcaemia. We report a case of refractory hypercalcaemia secondary to parathyroid carcinoma requiring haemodialysis.
  5. Loh HH, Tan CHH
    Med J Malaysia, 2012 Feb;67(1):133-5.
    PMID: 22582570 MyJurnal
    Wasp stings can present in various ways, ranging from mild self-limiting illness to severe multi organ failure with a potentially fatal outcome. We report a case of multiple wasp stings leading to acute renal failure needing prolonged dialysis support and posterior reversible encephalopathy syndrome.
  6. Loh HH, Norlela S, Nor Azmi K
    Med J Malaysia, 2015 Jun;70(3):208-9.
    PMID: 26248787 MyJurnal
    The purpose of this case study is to report the use of oral Bovril (a food supplement which contains arginine) as an alternative test for growth hormone stimulation test. We performed oral Bovril test in 3 patients -- one with suspected growth hormone deficiency in whom insulin tolerance test could not be performed (subject A), one sex-matched control (subject B), and one with confirmed growth hormone deficiency (subject C). 14g/m(2) of oral Bovril was mixed with 150ml of warm water and was given to all three subjects. Blood for growth hormone was taken at baseline, and every 30 minutes till 150 minutes after ingestion of oral Bovril. The ingestion of oral Bovril showed a positive response in subjects A and B, with highest growth hormone levels of 28.4mIU/L and 42.0mIU/L respectively at 150 minutes. Subject C had suppressed growth hormone throughout the test. Oral Bovril is readily available and is a safe alternative for standard growth hormone stimulation test.
  7. Loh HH, Kamaruddin NA
    Ann Acad Med Singap, 2020 Jul;49(7):468-476.
    PMID: 33000110
    During Ramadan, Muslims fast from sunrise (Sahur) to sunset (Iftar) and are required to abstain from food and fluids, including oral and injectable medications. Patients with diabetes who fast during Ramadan are at risk of developing hyperglycemia with increased risk of ketoacidosis, hypoglycemia, dehydration and thrombosis. Pre-Ramadan education and preparation of a fasting patient are essential to reduce severe complications. This review paper summarizes studies to date on oral and injectable medications available for patients with type 2 diabetes during Ramadan fasting, as well as recommendations on management of these patients during Ramadan. Although there is limited data on the use of Metformin, Acarbose and Thiazolidinedione in Ramadan, they appear to be safe. Sulphonylurea, especially Glibenclamide, is associated with higher risk of hypoglycemia during Ramadan fasting, hence may need adjustment in dosing and timing. The incretin group and SGLT2 inhibitor use during Ramadan fasting is associated with low risk of hypoglycemia with no increased adverse events. Insulin regimes need to be individualized for patients who fast during Ramadan.
  8. Loh HH, Taipin H, Said A
    Obes Sci Pract, 2021 Aug;7(4):425-431.
    PMID: 34401200 DOI: 10.1002/osp4.512
    Background: Most studies showing association between mothers with obesity in pregnancy or excessive gestational weight gain (GWG) and adverse neonatal outcome were cross-sectional or retrospective. Many included patients are with gestational diabetes mellitus (GDM), which is a strong risk factor for this adverse outcome. There are no prospective studies on this topic in Malaysia. This study aimed to examine prospectively the effects of obesity in pregnancy and GWG, independent of GDM, on neonatal outcome.

    Methods: Pregnant mothers in the first trimester, who presented to health clinics in Kuching, were screened. Mothers with existing diabetes mellitus or GDM were excluded using 75-g oral glucose tolerance test during the first and second trimesters. Participants with the first trimester BMI ≥ 23 kg/m2 were recruited as overweight/obese group, whereas those with BMI 18.5-22.9 kg/m2 were taken as the comparison group. At every trimester visit, mothers' weights were recorded. Babies' birth weight and occurrence of adverse neonatal outcome were documented.

    Results: There were 123 mothers recruited as overweight/obese group (mean BMI 29.0 kg/m2 ± 4.45) and 102 mothers as comparison group (mean BMI 20.4 kg/m2 ± 1.48). The number of low birth weight was similar between groups: 9.8% in overweight/obese group, 6.9% in the comparison group (p = 0.416). More than half of these babies were born to mothers with inadequate GWG (58.3% in obese group vs. 57.1% in control group, p = 0.077). There was no significant difference in the mean birth weight (3000 g ± 454.5 vs. 3038 g ± 340.8, p = 0.471), preterm delivery (8.13% vs. 3.92%, p = 0.193), and admission rate to neonatal intensive care unit (8.13% vs. 7.85%, p = 0.937) between groups. There was a positive correlation between the total GWG in overweight/obese group on baby's weight (r = 0.222, p = 0.013). Inadequate GWG was not correlated with lower birth weight (p = 0.052).

    Conclusions: Obesity in pregnancy was not associated with poor neonatal outcome in this small sample of women in Malaysia. Total GWG showed a weak correlation with baby's birth weight in overweight/obese group.

  9. Loh HH, Yee A, Loh HS
    Minerva Endocrinol., 2019 Dec;44(4):387-396.
    PMID: 30482008 DOI: 10.23736/S0391-1977.18.02867-5
    INTRODUCTION: Recent studies showed a possible association between hyperaldosteronism and secondary hyperparathyroidism leading to reduced bone health, however results are conflicting.

    EVIDENCE ACQUISITION: We conducted a meta-analysis to evaluate the relationship between primary aldosteronism (PA) with bone biochemical markers and to assess bone mineral density in patients with primary aldosteronism.

    EVIDENCE SYNTHESIS: A total of 939 subjects were examined (37.5% with PA). Patients with PA had significantly higher serum parathyroid hormone, lower serum calcium, higher urine calcium excretion and higher serum alkaline phosphatase compared to patients without PA, with no significant difference in serum vitamin D between both groups. Bone mineral density of lumbar spine, femoral neck and total neck of femur were similar between two groups. With PA treatment, there was a significant increment in serum calcium and reduction in serum parathyroid hormone.

    CONCLUSIONS: PA is associated with hypercalciuria with subsequent secondary hyperparathyroidism. This potentially affects bone health. We recommend this to be part of complication screening among patients with PA.

  10. Shahar MA, Omar AM, Loh HH
    Can J Diabetes, 2019 Mar;43(2):98-104.e7.
    PMID: 30145243 DOI: 10.1016/j.jcjd.2018.06.003
    OBJECTIVES: As is true for other chronic illnesses, perception of disease control is pivotal to patient empowerment in diabetes care. This study aimed to describe the perception of diabetes control by patients with poor glycated hemoglobin (A1C) levels so as to explore the relationship between perception and various sociodemographic and disease characteristics and to measure the patients' knowledge, attitudes and practices in diabetes care.
    METHODS: A cross-sectional study was made involving 276 patients with type 2 diabetes mellitus. After obtaining informed consent, their sociodemographics, medical histories and most recent available blood investigations were documented. Patients were asked about their perceptions of diabetes control-whether it was excellent, moderate or poor. A Malay-language knowledge, attitudes and practice questionnaire was administered to respondents. Analyses were descriptive and exploratory.
    RESULTS: The median age of the subjects and the durations of diabetes were 56 (interquartile range, 48-62) years and 8 (interquartile range, 4-13) years, respectively. The median A1C level was 9.5% (interquartile range, 8.3%-11.4%). Despite having poor A1C levels, 28.4% of patients perceived that their diabetes control was excellent; 58.9% perceived it as moderate, and only 12.7% accurately perceived it as poor. A significant number of those with higher education had wrong perceptions, indicating that other factors, such as effective communication, need to be considered. The absence of an association between perception and duration of diabetes suggests that information given over the years did not contribute to patients' understanding of disease control. Younger patients had better knowledge scores. Those with higher education levels had higher quartiles of knowledge and attitude but not practice scores.
    CONCLUSIONS: This study demonstrated discordance between perceived diabetes control and actual A1C levels, which may hinder effective diabetes care.
    Study site: a tertiary referral center and a primary care centre in Kuantan, Pahang, Malaysia
  11. Loh HH, Yee A, Loh HS, Sukor N, Kamaruddin NA
    Minerva Endocrinol., 2015 Dec 23.
    PMID: 26698544 DOI: 10.23736/S0391-1977.16.02394-4
    INTRODUCTION: Long-term outcome of patients with adrenal incidentaloma (AI) is unknown. The aim of this study was to systematically summarize the follow-up and outcome of clinically silent AI who do not undergo surgery.
    EVIDENCE ACQUISITION: All major databases and medical literature in English-language, published from 1998 to May 2015, were systematically searched for publications on AI. Primary endpoint was hormonal hyper function; secondary endpoints were time from diagnosis to study endpoint and the outcome of adrenalectomy. Meta-analysis was performed using both qualitative and quantitative approach.
    EVIDENCE SYNTHESIS: A total of 11 publications were included. Total sample size was 1298 patients. Mean follow-up duration was 44.2 months. There were 82 patients confirmed to have subclinical Cushing's syndrome at diagnosis, with 1.79% new cases at the end of follow up (95% CI, 0.002 to 0.045). Incidence of Cushing's syndrome was 0.7% (95% CI, 0.001 to 0.013) and pheochromocytoma 0.4% (95% CI, 0.001 to 0.008). The mean tumor size was 2.52cm, with mean increment of 0.03cm to 2.9cm at the end of follow up. About 3% of patients ended up with surgery (95% CI, 0.01 to 0.05) but none were due to primary adrenal malignancy. Time of greatest risk of developing Cushing's syndrome and pheochromocytoma was between months 36 and 42 (hazard rate 14%), and between months 48 and 54 (hazard rate 7%) respectively.
    CONCLUSIONS: Malignant change in non-functioning AI is rare. The risk of developing overt disease over the follow-up period is low. A less stringent imaging and functional work-up interval can be considered.
  12. Loh HH, Yee A, Loh HS, Sukor N, Kamaruddin NA
    Prim Care Diabetes, 2016 Jun;10(3):210-9.
    PMID: 26392074 DOI: 10.1016/j.pcd.2015.09.001
    AIM: To systematically review the literature to compare the use of DPP4 inhibitors vs sulphonylurea in type 2 diabetic Muslim patients who fast in Ramadan, with regards to its safety, tolerability, glycemic control, and body weight changes.

    METHODS: All English-language medical literature published from inception till October 2014 which met the inclusion criteria were reviewed and analyzed.

    RESULTS: A total of nine papers were included, reviewed and analyzed. The total sample size was 4276 patients. All studies used either of the two DPP4 inhibitors - Vildagliptin or Sitagliptin, vs sulphonylurea or meglitinides. Patients receiving DPP4 inhibitors were less likely to develop symptomatic hypoglycemia (risk ratio 0.46; 95% CI, 0.30-0.70), confirmed hypoglycemia (risk ratio 0.36; 95% CI, 0.21-0.64) and severe hypoglycemia (risk ratio 0.22; 95% CI, 0.10-0.53) compared with patients on sulphonylureas. There was no statistically significant difference in HbA1C changes comparing Vildagliptin and sulphonylurea.

    CONCLUSION: DPP4 inhibitor is a safer alternative to sulphonylurea in Muslim patients with type 2 diabetes mellitus who fast during the month of Ramadan as it is associated with lower risk of symptomatic, confirmed and severe hypoglycemia, with efficacy comparable to sulphonylurea.

  13. Loh HH, Lim LL, Yee A, Loh HS
    BMC Psychiatry, 2019 01 08;19(1):12.
    PMID: 30621645 DOI: 10.1186/s12888-018-2006-2
    BACKGROUND: Although depression is associated with changes in the hypothalamic-pituitary-thyroid axis, its relationship with subclinical hypothyroidism (SCH) is controversial. To date, there is a lack of data on the improvement of depressive symptoms with levothyroxine therapy among individuals with coexistent SCH.

    METHODS: We conducted a meta-analysis to evaluate the association between SCH and depression including 1) the prevalence of depression in SCH (with a sub-analysis of the geriatric cohort), 2) thyroid stimulating hormone (TSH) level among patients with depression and 3) the effect of levothyroxine therapy among patients with SCH and coexistent depression.

    RESULTS: In a pooled analysis of 12,315 individuals, those with SCH had higher risk of depression than euthyroid controls (relative risk 2.35, 95% confidence intervals [CI], 1.84 to 3.02; p 

  14. Loh HH, Kamaruddin NA, Zakaria R, Sukor N
    Minerva Endocrinol., 2018 Jun;43(2):117-125.
    PMID: 28001017 DOI: 10.23736/S0391-1977.16.02553-0
    BACKGROUND: Recent studies showed association between hyperaldosteronism and low bone density among patients with primary aldosteronism (PA) due to secondary hyperparathyroidism. Our objective is to assess bone turnover markers (BTM) and bone mineral density (BMD) of PA patients compared to essential hypertension.

    METHODS: This was an open-label, prospective, case-controlled study, conducted over 12 months. Fifty-two consecutive patients referred for secondary hypertension were screened. Eighteen patients with confirmed PA (diagnosis based on the Endocrine Society clinical guideline) and seventeen matched controls with essential hypertension were recruited. BTM (CTX and P1NP), BMD, intact parathyroid hormone (iPTH), and bone profile were assessed at baseline and three months following treatment among the PA patients. Calcium intake was assessed using a validated questionnaire. Primary outcomes were the changes of bone markers and BMD following treatment of PA, and their relation to other parameters.

    RESULTS: PA patients had significantly lower serum calcium and higher iPTH despite comparable vitamin D levels with control group. Both BTM were significantly higher among the PA group. BMD of lumbar spine, neck of femur and distal radius did not differ between groups. Three months following treatment, there were significant: 1) reduction in BTM; 2) improvement in the lumbar spine BMD; 3) reduction in iPTH level; and 4) increment of serum 25-OH vitamin D level.

    CONCLUSIONS: Our findings support that bone loss and potential fracture risk among PA patients are likely a result of aldosterone-mediated secondary hyperparathyroidism. Patients with early PA may already exhibit increased bone turnover despite no significant changes in BMD.

  15. Loh HH, Lim LL, Loh HS, Yee A
    J Diabetes Investig, 2019 Nov;10(6):1490-1501.
    PMID: 30938074 DOI: 10.1111/jdi.13054
    AIMS/INTRODUCTION: Although patients with type 1 diabetes are medically exempt, many insist on fasting during Ramadan. Multiple daily insulin injections (MDI), premixed insulin and continuous subcutaneous insulin infusion (CSII) are commonly used. To date, little is known about the safety of Ramadan fasting in these patients.

    MATERIALS AND METHODS: We pooled data from 17 observational studies involving 1,699 patients treated with either CSII or non-CSII (including premixed and MDI) regimen. The study outcomes were the frequencies of hypoglycemia, hyperglycemia and/or ketosis. Given the lack of patient-level data, separate analyses for premixed and MDI regimen were not carried out.

    RESULTS: The CSII-treated group (n = 203) was older (22.9 ± 6.9 vs 17.8 ± 4.0 years), and had longer diabetes duration (116.7 ± 66.5 vs 74.8 ± 59.2 months) and lower glycated hemoglobin (7.8 ± 1.1% vs 9.1 ± 2.0%) at baseline than the non-CSII-treated group (n = 1,496). The non-CSII-treated group had less non-severe hypoglycemia than the CSII-treated group (22%, 95% CI 13-34 vs 35%, 95% CI 17-55). Of the non-CSII-treated group, 7.1% (95% CI 5.8-8.5) developed severe hypoglycemia, but none from the CSII-treated group did. The non-CSII-treated group was more likely to develop hyperglycemia (12%, 95% CI 3-25 vs 8.8%, 95% CI 0-31) and ketosis (2.5%, 95% CI 1.0-4.6 vs 1.6%, 95% CI 0.1-4.7), and discontinue fasting (55%, 95% CI 34-76 vs 31%, 95% CI 9-60) than the CSII-treated group.

    CONCLUSIONS: The CSII regimen had lower rates of severe hypoglycemia and hyperglycemia/ketosis, but a higher rate of non-severe hyperglycemia than premixed/MDI regimens. These suggest that appropriate patient selection with regular, supervised fine-tuning of the basal insulin rate with intensive glucose monitoring might mitigate the residual hypoglycemia risk during Ramadan.

  16. Loh HH, Yee A, Loh HS, Kanagasundram S, Francis B, Lim LL
    Hormones (Athens), 2020 Sep;19(3):413-423.
    PMID: 32462512 DOI: 10.1007/s42000-020-00210-0
    PURPOSE: Polycystic ovarian syndrome (PCOS) is a common disorder characterized by clinical or biochemical hyperandrogenism and ovulary dysfunction. Female sexual dysfunction (FSD) adversely affects quality of life and interpersonal relationships. We aimed to compare the prevalence of FSD in women with and without PCOS.

    METHODS: We pooled data from 28 observational studies involving 6256 women. Apart from the total prevalence of FSD, subgroup analyses based on different PCOS diagnostic criteria and obesity status (body mass index [BMI] ≥ 25 kg/m2) were performed. The differences in total and subscale scores of the Female Sexual Function Index (FSFI) among women with and without PCOS were also compared.

    RESULTS: Women with PCOS were younger (mean ± SD 28.56 ± 3.0 vs 31.5 ± 3.2 years, p 

  17. Loh HH, Lim LL, Yee A, Loh HS, Vethakkan SR
    Minerva Endocrinol., 2019 Jun;44(2):221-231.
    PMID: 28294593 DOI: 10.23736/S0391-1977.17.02584-6
    INTRODUCTION: We conducted a meta-analysis to assess the effects of vitamin D replacement on biochemical and skeletal parameters in subjects with mild primary hyperparathyroidism (PHPT) and coexistent vitamin D deficiency.

    EVIDENCE ACQUISITION: A systematic search of all English-language medical literature published from 1980 till May 2016 using PubMed, Embase and Ovid was performed. Nine observational studies were evaluated after fulfilling the inclusion and exclusion criteria.

    EVIDENCE SYNTHESIS: A total of 547 patients were examined. All studies used vitamin D2/D3 or calcifediol (25-hydroxyvitamin D3), There was significant improvement of serum 25(OH)D with unchanged serum iPTH level after vitamin D replacement, with pooled d+: 3.10 (95% CI 2.25 to 3.95), P<0.01 and pooled d+: 0.82 (95% CI -0.35 to 1.98), P=0.16 respectively. There was neither worsening of the pre-existing hypercalcemia (pooled d+: -0.27 [95% CI -1.09 to 0.64, P=0.56]) nor hypercalciuria (pooled d+: 3.64 [95% CI -0.55 to 7.83, P=0.09]). Two studies assessed in this meta-analysis reported unchanged bone density with vitamin D replacement.

    CONCLUSIONS: Vitamin D replacement in subjects with mild PHPT and coexistent vitamin D deficiency improved serum 25(OH)D level without worsening of pre-existing hypercalcemia or hypercalciuria. Well-designed multicenter randomized controlled trials examining pre- and postoperative outcomes of vitamin D therapy in patients with different severities of PHPT and vitamin D inadequacy are warranted to elucidate the most appropriate vitamin D treatment protocol and determine the long-term safety concerns.

  18. Yee A, Loh HS, Loh HH, Riahi S, Ng CG, Sulaiman AHB
    Ann Gen Psychiatry, 2019;18:25.
    PMID: 31649742 DOI: 10.1186/s12991-019-0249-z
    Background: Methadone is an effective therapy for opiate dependence. However, one of the commonest side effects is sexual dysfunction among male patients. Buprenorphine is an alternative to methadone. This study aimed to compare sexual desire among opiate-dependent male patients on buprenorphine (BMT) and methadone maintenance therapy (MMT).

    Methods: This cross-sectional study involved 126 male opiate-dependent patient who were tested for total testosterone (TT) and prolactin levels, and were interviewed and completed the Sexual Desire Inventory-2 (SDI-2), Malay language of International Index of Erectile Function (Mal-IIEF-15) and the Malay version of the self-rated Montgomery-Asberg Depression Rating Scale (MADRS-BM) questionnaires.

    Results: There were 95 (75.4%) patients on MMT and 31 (24.6%) on BMT. Patients on MMT scored significantly lower in the sexual desire domain (Mal-IIEF-15 scores) (p 

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