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Renal transplant
patients are at significantly greater risk of cardiovascular disease
(CVD) than are members of the general population.
The incidence
of ischaemic heart disease events has been found to be as high as
23% by 15 years post transplantation (1). Another
study found that the incidence of CVD was about five times greater
than that predicted by the Framingham Heart Study data for patients
of comparable age and gender (2).
So, as graft-survival
time increases, renal healthcare professionals are becoming increasingly
concerned that many of these patients are surviving their renal
disease only to develop cardiovascular disease.
On a positive
note, professionals have also identified several modifiable risk
factors, which can by targeted for intervention.
Why
is CVD risk greater?
Many of the risk factors for heart disease identified in renal
transplant patients are the same as in the general population but
there are additional risk factors specific to chronic renal failure
(3).
Some of the main risk factors identified are:
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a
previous history of chronic renal failure (CRF); |
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high
prevalence of hyperlipidaemia; |
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high
proportion of diabetics; and |
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hyperhomocysteinaemia. |
Previous
history of CRF
Patients on
dialysis are at even greater risk of CVD than are transplant patients.
CVD mortality is approximately 15-times higher in dialysis patients
than in the general population (4). Ideally,
suitable patients should be transplanted as soon as possible. All
chronic renal failure patients need to be targeted to reduce CVD
risk.
High
prevalence of hyperlipidaemia
It is generally
accepted that total and LDL cholesterol increases the risk of CVD
in the general population. The clinical evidence for an association
in renal transplant patients is not conclusive but the observational
studies undertaken have shown a strong link (5).
High
proportion of diabetics
The incidence
of post-transplant diabetes has been estimated at 3.6 to 18% (5).
Immunosuppressive medication and weight gain post transplant have
both been identified as risk factors for diabetes. The increased
risk of CVD in diabetics is widely recognised.
Hyperhomocysteinaemia
It has been
estimated that renal transplant patients have homocysteine levels
twice as high than in the general population when matched for age
and gender (5). It is proposed that increased
homocysteine increases the risk of CVD (5,6).
Many studies have shown that treatment with folic acid in combination
with vitamin B6 and B12 can decrease homocysteine levels (6,7).
Healthy Heart Sessions at Brighton
The aim of the
Healthy Heart Session is to give patients information about their
risk of cardiovascular disease and on how they can reduce this risk
through lifestyle changes. The Sessions are multidisciplinary and
are designed to be informative and enjoyable.
The multidisciplinary
team includes the consultant nephrologist, the renal transplant
sister, the dietitian, the pharmacist and the physiotherapist.
During the Session,
patients are taught what heart disease is, why transplant patients
are at greater risk, and how they can reduce their risk factors.
Other topics discussed include medication, diet and exercise.
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