Type 2 diabetes doubles the risk of SCA
The researcher decided to investigate the population of people with type 2 diabetes because their risk of SCD is around twice that of those without type 2 diabetes. Because these patients have relatively frequent checkups with general practitioners, Mr. Harms turned to primary care databases that contained comprehensive and relatively routine information on risk indicators.
Longitudinal associations between clinical characteristics of 3,919 patients with type 2 diabetes – both those with and those without a history of CVD – and SCA (a total of 689 patients) were determined.
Cases were found in the AmsteRdam REsuscitation STtudies (ARREST) registry of out-of-hospital resuscitation attempts by emergency medical services in the Dutch region of Noord-Holland from 2010 to 2019. Case patients were matched with up to five control patients. The control group comprised people with type 2 diabetes who had not experienced an SCA. Control patients were sourced from the same primary care practices who were of similar age and sex. Clinical measurements, including blood pressure and blood glucose readings, medication use, and medical history for the 5 years leading up to an SCA, were obtained from general practice records. A multivariable analysis was performed, and results were stratified for people with and for those without a history of CVD.
Of particular interest were drugs that interfere with cardiac function, including some prokinetic, antibiotic, and antipsychotic medications. All of the drugs are known to be associated with a change in QTc prolongation. Examples include domperidone (QTc-prolonging prokinetic), macrolides and fluoroquinolones (QTc-prolonging antibiotics), and haloperidol (a QTc-prolonging antipsychotic).
Antibiotic and antipsychotic use might contribute to SCA in T2D
Case patients and control patients were similar in age, hemoglobin A1c level, and other characteristics with the exception that more patients with SCA had a history of CVD (40.0% vs. 29.4%).
“Looking at the associations in the overall population, insulin use was strongly associated with SCA risk [hazard ratio, 2.38] and perhaps this was an indicator of severity of type 2 diabetes,” remarked Mr. Harms. “Also, unsurprisingly, a history of arrhythmia [HR, 1.68] and, more surprisingly, prokinetic drug use [HR, 1.66; 95% confidence interval, 1.20-2.31], specifically those known for QTc-prolongation, were associated with SCA.”
Among people who had experienced an SCA and who did not have a history of CVD (337 case patients/2,023 control patients), QTc-prolonging antipsychotic medication use was associated with SCA at an HR of 2.87, and antibiotic medication use was associated with SCA at an HR of 1.66. A low fasting glucose level (< 4.5 mmol/mol) was associated with SCA at an HR of 2.5; severely high systolic blood pressure (> 180 mm Hg) was associated with SCA at an HR of 2.21; low HDL cholesterol level, with an HR of 1.35; and high LDL cholesterol level (> 2.6 mmol/L), with an HR of 1.64.
Among people with a history of CVD (352 case patients/1,207 control patients), associations between albuminuria and SCA were moderate (HR, 1.54) and severe (HR, 1.55); heart failure was associated with SCA at an HR of 1.85 (95% CI, 1.50-2.29).
Comoderator Dr. Fejfarova added that, in addition to the findings from Dr. Harms’ study, other research presented in the same session highlighted the importance of checking patients for the presence of arrhythmias that could lead to the development of atrioventricular blocks, sinus node diseases, and SCA.
Mr. Harms and Dr. Fejfarova have disclosed no relevant financial relationships.
A version of this article first appeared on Medscape.com.