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Hip fracture risk in patients with a diagnosis of pernicious anemia
Nathan A Merriman1, Mary E Putt, David C Metz
1Division of Gastroenterology, Center for Clinical Epidemiology and Biostatistics, Philadelphia, Pennsylvania 19104-6021, USA.
Insights
Pernicious anemia (PA) patients face a higher risk of hip fractures. This elevated risk persists even after vitamin B-12 treatment, suggesting achlorhydria as a contributing factor.
Area of Science:
- Bone Metabolism & Osteoporosis Research
- Gastroenterology & Hematology Studies
- Epidemiological Research Methods
Background:
- Pernicious anemia (PA) is linked to vitamin B-12 deficiency and achlorhydria, both impacting bone health.
- Bone strength is compromised by the physiological changes associated with PA.
- Understanding PA's skeletal implications is crucial for patient management.
Purpose of the Study:
- To investigate the association between pernicious anemia and the risk of hip fracture.
- To quantify the hip fracture risk in individuals diagnosed with PA.
- To explore potential underlying mechanisms for altered bone fragility in PA.
Main Methods:
- Retrospective cohort study utilizing the UK General Practice Research Database (GPRD) from 1987-2002.
- Identified PA patients (40-90 years) receiving vitamin B-12 therapy, matched with four controls per patient.
- Cox regression analysis employed to calculate the hazard ratio (HR) for hip fracture in PA patients.
Main Results:
- A cohort of 9,506 PA patients was compared with 38,024 controls.
- PA patients exhibited a significantly increased risk of hip fracture (HR = 1.74; 95% CI: 1.45-2.08).
- Newly diagnosed PA patients showed a more pronounced hip fracture risk (HR = 2.63; 95% CI: 2.03-3.41).
Conclusions:
- Pernicious anemia diagnosis is associated with an elevated risk of hip fracture.
- The increased fracture risk remains elevated years post-vitamin B-12 therapy initiation.
- Chronic achlorhydria may be a key factor in the persistent bone fragility observed in PA patients.
Background & Aims:
Pernicious anemia (PA) is characterized by vitamin B-12 deficiency and achlorhydria, both of which have a detrimental effect on bone strength. The principle aim of this study was to determine the risk of hip fracture in patients with PA.
Methods:
This is a retrospective cohort study using the General Practice Research Database (GPRD) from the United Kingdom. GPRD data from May 1987 until April 2002 were utilized to identify patients between 40 and 90 years of age at the time of GPRD enrollment. The exposed group contained patients with a diagnosis of PA being treated with vitamin B-12 therapy. We matched each patient having a diagnosis of PA with 4 randomly selected non-PA patients with respect to age (+/-1 year) and sex. Cox regression analysis was used to determine the hazard ratio (HR) for hip fracture associated with PA.
Results:
Nine thousand five hundred six patients with a diagnosis of PA receiving vitamin B-12 injection therapy were identified and compared to 38,024 controls. Patients with PA had a greater risk of hip fracture than the controls (HR = 1.74; 95% CI: 1.45-2.08). The increase in hip fracture risk was even more pronounced among those patients newly diagnosed with PA during GPRD follow-up (HR = 2.63; 95% CI: 2.03-3.41).
Conclusions:
Patients with a diagnosis of PA have an elevated risk of hip fracture. The increased hip fracture risk was persistent even years after vitamin B-12 therapy. Chronic achlorhydria could be the mechanism contributing to the persistently elevated hip fracture risk.
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