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Incidence of acute myocardial infarction in the evolution of dialysis patients
Carmen Sánchez-Perales1, Eduardo Vázquez-Ruiz de Castroviejo, Pilar Segura-Torres
1Servicio de Nefrología, Complejo Hospitalario de Jaén. mcsanchezp@senefro.org
Insights
Acute myocardial infarction (AMI) is common in dialysis patients, especially those with prior coronary artery disease (CAD). Post-infarction mortality is high, underscoring the need for improved cardiovascular care in this population.
Area of Science:
- Nephrology
- Cardiology
- Clinical Medicine
Background:
- Coronary artery disease (CAD) is highly prevalent in patients undergoing dialysis.
- Significant variability exists in reported rates of acute myocardial infarction (AMI) among dialysis patients.
- Understanding AMI incidence and outcomes in this population is crucial for clinical management.
Purpose of the Study:
- To determine the incidence of AMI in patients initiating dialysis.
- To analyze the characteristics and clinical outcomes of AMI in incident dialysis patients.
- To identify risk factors for AMI in patients on dialysis.
Main Methods:
- Prospective recording of AMI events in dialysis patients from 1999-2007.
- Assessment of patient demographics, comorbidities (diabetes, hypertension, prior CAD, PAD, atrial fibrillation, tobacco use), and biochemical markers.
- Long-term follow-up until transplant, death, loss to follow-up, or study end (December 2010).
Main Results:
- AMI incidence was 2.13 per 100 patient-years, significantly higher (7.53/100 patient-years) in patients with prior CAD.
- AMI occurred within the first year of dialysis in 37.5% of cases.
- Predictors of AMI included older age, prior CAD, and diabetes as the cause of nephropathy.
- In-hospital mortality was 30%, with 80% of investigated patients showing multi-vessel disease.
Conclusions:
- The incidence of AMI is notably high in patients starting dialysis.
- Patients with pre-existing coronary artery disease face a threefold increased risk of AMI.
- High post-infarction mortality and frequent multi-vessel disease characterize AMI in this cohort.
Background:
Although the estimated frequency of coronary artery disease (CAD) in patients on dialysis is very high, there is considerable variation in the studies published to date regarding the rate of acute myocardial infarction (AMI) in these patients.
Objective:
To establish the incidence of AMI and to analyse the characteristics and consequences of this entity on the clinical progression of incident dialysis patients.
Methods:
We recorded AMI in the patients treated in our dialysis unit between 01/01/1999 and 31/12/07. The variables assessed were: prior diagnosis of diabetes, hypertension, CAD (AMI or lesions observed in coronary angiography), ischaemic cerebrovascular accident, advanced peripheral artery disease (PAD), atrial fibrillation and tobacco use. Biochemical analyses included: urea, creatinine, haematocrit, calcium, phosphorous, iPTH, lipids and albumin. Follow-up lasted until transplant, death, loss to follow-up or study end in Dec. 2010.
Results:
Of the 576 patients recruited (aged 64.6 ± 16 years), 24.7% had diabetes, 82.3% were on haemodialysis (17.7% on peritoneal dialysis), and 34 (5.9%) had a previous diagnosis of CAD. In a follow-up lasting a mean of 40.2 ± 32 months (1931.5 patient-years), 40 patients (6.9%) suffered an AMI. The incidence was 2.13/100 patient-years. The patients without CAD had an incidence of 1.84/100 patient-years and those with a previous diagnosis of CAD had an incidence of 7.53/100 patient-years. In 22.5% of patients, AMI happened in the first 3 months of dialysis, and 37.5% in the 1st year. Of the 40 AMI, 15 were with ST-segment elevation (incidence: 0.79/100 patient-years) and 25 were non ST-segment elevation (incidence: 1.33/100 patient-years). The factors that predicted the occurrence of AMI in dialysis were older age (OR: 1.037; 95% CI: 1.009-1.067; P=.011), previous CAD (OR: 3.35; 95% CI: 1.48-7.16; P=.004), and diabetes as a cause of nephropathy (OR: 2.96; 95% CI: 1.49-5.86; P=.002). In-hospital mortality was 30%, with 72.5% of deaths occurring in the 1st year and 82.5% in the 2nd; 80% of the patients who underwent a coronary angiography had multi-vessel disease.
Conclusions:
The incidence of AMI in incident dialysis patients is high. In previous coronary disease patients, the incidence is 3-fold higher. Post-infarction mortality is very high and multi-vessel disease is very frequent.
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