Can colonoscopy sedation trigger SVT?

Question

Hello doctor,

I had SVT in the past from antidepressants. I am getting a colonoscopy in a week, and I am worried about the Propranolol they will give me setting something off.

Please help.

Thank you.

Answer 1

Hello,

Welcome to icliniq.com.

I have gone through your query and understand your concern.

Propranolol is not typically used during colonoscopies. The standard sedation for colonoscopy is usually a combination of:

Midazolam, a Benzodiazepine used for sedation and amnesia.
Fentanyl, an opioid used for pain relief and comfort.
Propofol, which provides deeper sedation and is often administered by an anesthesiologist or nurse anesthetist.

Propranolol is a beta-blocker used to treat heart conditions, not a sedative, so it would be unusual to use it for a routine colonoscopy.

That said, your SVT (supraventricular tachycardia) history is genuinely important to disclose. You should:

Tell the gastroenterologist and the anesthesiologist or CRNA (certified registered nurse anesthetist) before the procedure. They may already have your medical history, but make sure your history of SVT and its association with antidepressant use is clearly communicated.
Ask what sedation agents they plan to use. This is a completely reasonable question, and they should tell you.
Mention any current or past antidepressants, since some, like TCAs (tricyclic antidepressants) or SNRIs (serotonin and norepinephrine reuptake inhibitors), can affect cardiac conduction and interact with sedation drugs.
Ask if cardiac monitoring will be in place. It almost certainly will be, as pulse oximetry and EKG (electrocardiogram) monitoring are standard during colonoscopy sedation.

I hope I have answered your question.

Let me know if I can assist you further.

Thank you.