Lipids Profile in Primary Hyperparathyroidism (LPHP)

Atherogenic Lipoprotein Phenotype and LDL Size and Subclasses in Patients With Primary Hyperparathyroidism

Severe Primary hyperparathyroidism (PHP) has been associated with increased cardiovascular morbidity and mortality. Hypertension, dyslipidemia and impaired glucose tolerance were demonstrated in severe PHP, with improvement after surgery in these variables. Recent evidence suggests that the 'quality' rather than only the 'quantity' of low-density lipoprotein (LDL)-cholesterol exerts a direct influence on the cardiovascular risk. Thus, the proposed study protocol is intended to evaluate lipoprotein phenotype and LDL size and subclasses in patients with primary hyperparathyroidism.

Study Overview

• Status: Terminated
• Conditions: Primary Hyperparathyroidism

Detailed Description

Severe traditional PHP has been associated with increased cardiovascular morbidity and mortality with an increase in acute MI prior to surgery.PHP is associated with increased prevalence of left ventricular hypertrophy, independent of blood pressure. Also prevalent in PHP, are valvular and myocardial calcifications as well as diastolic filling impairment, with a significant correlation with serum calcium and PTH levels.

Hypertension, dyslipidemia and impaired glucose metabolism were demonstrated in severe PHP, with improvement after surgery in these variables.Glucose tolerance test performed in patients with PHP revealed that 51% had impaired glucose tolerance, 34% had diabetes mellitus and 17% had impaired fasting glucose values. After successful parathyroidectomy fasting and 2-h plasma glucose falls significantly. Others have demonstrated hyperinsulinemia and impaired glucose tolerance without normalization after parathyroidectomy.

Most of the literature showing an increased cardiovascular risk is in those patients with more severe PHP .Patients with mild PHP had higher serum cholesterol, triglycerides, glucose, urate and hemoglobin values compared with controls.Also, moderate to severe vitamin D deficiency is a risk factor for developing cardiovascular disease especially in patients with hypertension.

Atherosclerosis is a diffuse disease formerly considered a lipid storage disease, which actually involves an ongoing inflammatory response. Elevated circulating levels of acute phase proteins, cytokines, and cell adhesion molecules indicate that inflammatory processes are occurring systemically . C-reactive protein [CRP] and the presence of metabolic syndrome were interrelated and were highly predictive for cardiovascular disease. Hyperinsulinemia was proposed as the common factor of all the traditional risk factors for cardiovascular disease, and insulin resistance is recognized as a chronic low-level inflammatory state.Although various inflammatory markers were individually significantly related to future cardiovascular disease risk, they added very little additional prognostic information to the traditional markers.

Recently, we have shown that greater probability of metabolic syndrome and insulin resistance were observed in patients with severe PHP. Serum calcium is a predictor of these cardiovascular risk factors.

Recent evidence suggests that the 'quality' rather than only the 'quantity' of LDL exerts a direct influence on the cardiovascular risk. LDL comprises multiple distinct subclasses that differ in size, density, physicochemical composition, metabolic behaviour and atherogenicity. There are at least four major subspecies of LDL (e.g. large LDL-I, medium LDL-II, small LDL-III, very small LDL-IV) and the predominance of small dense LDL has been accepted as an emerging cardiovascular risk factor .

Thus, the proposed study protocol is intended to evaluate lipoprotein phenotype and LDL size and subclasses in patients with primary hyperparathyroidism.

• Study Type: Observational
• Enrollment (Actual): 100

Contacts and Locations

Study Locations

• Israel
  • Afula, Israel, 18101
    • Endocrine Institute , Haemek Medical Center

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 16 years to 83 years (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

• Sampling Method: Probability Sample

Study Population

Patients followed at the Endocrine Institute

Description

Inclusion Criteria:

• Patients with primary hyperparathyroidism

Exclusion Criteria:

• pregnant women
• patient taking hypolipidemic drugs
• patients with known cardiovascular, peripheral or cerebral atherosclerotic disease.

Study Plan

How is the study designed?

Design Details

• Observational Models: Case-Only
• Time Perspectives: Cross-Sectional

Collaborators and Investigators

• Sponsor: HaEmek Medical Center, Israel
• Collaborators: University of Zurich; University of Palermo

Study record dates

Study Major Dates

• Study Start: October 1, 2009
• Primary Completion (Actual): October 1, 2010
• Study Completion (Anticipated): October 1, 2016

Study Registration Dates

• First Submitted: August 18, 2009
• First Submitted That Met QC Criteria: August 18, 2009
• First Posted (Estimate): August 19, 2009

Study Record Updates

• Last Update Posted (Estimate): September 8, 2016
• Last Update Submitted That Met QC Criteria: September 7, 2016
• Last Verified: September 1, 2016

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Endocrine System Diseases; Parathyroid Diseases; Hyperparathyroidism; Hyperparathyroidism, Primary
• Other Study ID Numbers: 0097.09EMC