Biochemical monitoring after initiation of aldosterone antagonist therapy in users of renin-angiotensin system blockers: a UK primary care cohort study

BMJ Open. 2017 Nov 16;7(11):e018153. doi: 10.1136/bmjopen-2017-018153.

Abstract

Objective: To determine the frequency of biochemical monitoring after initiation of aldosterone antagonists(AA) in patients also using angiotensin-converting enzyme inhibitors/angiotensin receptor blockers (ACEI/ARB).

Setting: UK primary care.

Participants: ACEI/ARB users who initiated AA between 2004 and 2014.

Outcomes: We calculated the proportions with: (1) biochemical monitoring ≤2 weeks post initiation of AA, (2) adverse biochemical values ≤2 months (potassium ≥6 mmol/L, creatinine ≥220 µmol/L and ≥30% increase in creatinine from baseline) and (3) discontinuers of AA in those with an adverse biochemical value. We used logistic regression to study patient characteristics associated with monitoring and adverse biochemical values.

Results: In 10 546 initiators of AA, 3291 (31.2%) had a record of biochemical monitoring ≤2 weeks post initiation. A total of 2.0% and 2.7% of those with follow-up monitoring within 2 months of initiation experienced potassium ≥6 mmol/L and creatinine ≥220 µmol/L, respectively, whereas 13.5% had a ≥30% increase in creatinine. Baseline potassium (OR 3.59, 95% CI 2.43 to 5.32 for 5.0-5.5 mmol/L compared with <5.0 mmol/L) and estimated glomerular filtration rate 45-59 ml/min/1.73 m2 (OR 2.06, 95% CI 1.26 to 3.35 compared with ≥60 ml/min/1.73 m2) were independently predictive of potassium ≥6 mmol/L. Women and people with diabetes had higher odds of ≥30% increase in creatinine.

Conclusion: Less than one-third of patients taking ACEI/ARB had biochemical monitoring within 2 weeks of initiating AAs. Higher levels of monitoring may reduce adverse biochemical events.

Keywords: drug monitoring; electronic health records; health care delivery; heart failure; hypertension.

MeSH terms

  • Aged
  • Aged, 80 and over
  • Angiotensin Receptor Antagonists / adverse effects*
  • Angiotensin-Converting Enzyme Inhibitors / adverse effects*
  • Cohort Studies
  • Comorbidity
  • Creatinine / blood
  • Diabetes Mellitus / epidemiology
  • Drug Monitoring / statistics & numerical data*
  • Drug Therapy, Combination / adverse effects
  • Female
  • Heart Diseases / epidemiology
  • Humans
  • Hypertension / epidemiology
  • Male
  • Middle Aged
  • Mineralocorticoid Receptor Antagonists / adverse effects*
  • Peripheral Arterial Disease / epidemiology
  • Potassium / blood
  • Primary Health Care
  • Renin-Angiotensin System
  • Risk Factors
  • Spironolactone / adverse effects*
  • Spironolactone / analogs & derivatives
  • United Kingdom / epidemiology

Substances

  • Angiotensin Receptor Antagonists
  • Angiotensin-Converting Enzyme Inhibitors
  • Mineralocorticoid Receptor Antagonists
  • Spironolactone
  • Creatinine
  • Potassium