When a patient has heart disease, which site is not advisable for temperature measurement?

The rectal site is not advisable for temperature measurement in patients with heart disease due to the potential for causing increased heart rate or triggering vagal responses. Rectal thermometry involves stimulating the rectal area, which can sometimes lead to discomfort or a reflex that may impact the cardiac rhythm. In individuals with existing heart conditions, this response could exacerbate their health issues, making it a less safe method for obtaining a temperature.

In contrast, the oral site is typically safe for temperature assessment but may require the patient to be stable and able to cooperate. The aural site, measuring temperature in the ear, can provide a quick and accurate reading without the risks associated with rectal measurements. The axillary site is another alternative, although it is generally less accurate than oral and rectal methods, it poses no significant risk to someone with heart disease. Thus, the rectal site is particularly cautioned against in such patients.