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10th March 2022
A higher sodium intake from the use of soluble paracetamol tablets has been found to increase the risk of both cardiovascular disease (CVD) and mortality in patients, irrespective of their hypertensive status. This was the conclusion of a study by researchers from the Department of Orthopaedics, Xiangya Hospital, Changsha, China.
It has been known for some time that a higher sodium intake increases blood pressure and is therefore a risk factor for cardiovascular disease. Furthermore, an increased intake of the mineral has also been linked to an additional 1.65 million deaths from cardiovascular causes above a reference level intake of 2.0 g per day. In addition, studies suggest that in comparison to a moderate intake of sodium, higher intakes are associated with an increased risk of cardiovascular events and death among those with hypertensive but not form normotensive patients.
While lowering intake of sodium is known to be associated with a reduced risk of stroke and fatal coronary heart disease in adults, it would be unethical to examine the impact of a greater intake on CVD and mortality risk, given the benefits of reducing intake. While dietary sodium is a major source of intake, sodium is also contained within several medicines, in particular, soluble paracetamol. For the present study, the Chinese team compared the risks of incident CVD and all-cause mortality associated with the intake of sodium-containing soluble paracetamol (acetaminophen) compared to intake of non-sodium containing formulations according to patient’s hypertension status.
The team turned to the Health Improvement Network which is an electronic medical record database in the UK containing anonymised data for approximately 17 million patients as their source of information. They extracted data for two separate cohorts. The first included patients aged 60 – 90 years of age and with a diagnosis of hypertension and prescribed either a sodium and non-containing paracetamol formulation. The second cohort was similar although this time included patients without a diagnosis of hypertension. Socio-demographic data including gender, age, body mass index and various lifestyle factors were recorded and used as covariates in their analysis. The primary outcomes of interest were incident CVD which included myocardial infarction, stroke and heart failure, and all-cause mortality.
Sodium intake and CVD/mortality outcomes
For the first cohort, a total of 151,398 individuals with a mean age of 78.3 years (65.8% female) and a history of hypertension were included and of whom, 4532 were given a sodium-containing paracetamol. These were matched with a total of 147,299 without hypertension and a mean age of 71.4 (63.3% female), of whom 5,351 were given a sodium-containing paracetamol formulation.
Among those with hypertension, there were 122 cases of CVD among those given the mineral and 3051 cases among the non-sodium group over a median follow-up period of 0.89 and 0,93 years respectively. This gave a 59% higher risk of incident CVD among those taking a sodium-containing paracetamol formulation (Hazard ratio, HR = 1.59, 95% CI 1.32 – 1.92). Furthermore, the risk of all-cause mortality was more than double (HR = 2.05, 95% CI 1.92 – 2.19).
Among those given a sodium-containing paracetamol formulation but without hypertension, there was a 45% increased risk of CVD (HR = 1.45, 95% CI 1.18 – 1.79) and a 87% increased mortality risk (HR = 1.87, 95% CI 1.74 – 2.00).
Commenting on these results, the authors noted that sodium-containing drugs are an important but often overlooked source of the mineral. They concluded that individuals should avoid unnecessary excessive sodium intake through sodium-containing paracetamol use.
Zeng C et al. Sodium-containing acetaminophen and cardiovascular outcomes in individuals with and without hypertension Eur Heart J 2022