A member asked whether to hold Toprol in an athletic patient with a sleeping heart rate in the low 40s before a Cleerly CTA. Standard prep is low-dose metoprolol (25 to 50 mg) the night before and the morning of the scan; the worry was the night dose.
A cardiologist offered a threshold: if asymptomatic and above 45, no need to hold; below 45, reduce or stop. An interventional specialist was stricter: no beta-blockade at all below 55, since endurance athletes can run in the 30s overnight. An internist with a cardiology focus still gives a low dose on the day because anxiety and the contrast bolus raise heart rate, but skips the evening dose in bradycardic patients. She noted that nitroglycerin during the scan causes reflex tachycardia, part of why the protocol exists.
A real case made it concrete: one scan was cancelled after Toprol was held for a heart rate of 52 and the contrast pushed it to 80. Members recommended a cardiology-run center with IV metoprolol on standby.
The thread then questioned whether CTA was the right test. With Lp(a) of 250 and ApoB of 130, one cardiologist described her approach: drive ApoB as low as possible, use Repatha, add ezetimibe and bempedoic acid, especially in ApoE4 carriers, and monitor with CIMT. In younger women she raised breast radiation exposure and suggested CIMT plus CAC instead.
Key takeaways
- Heart rate above 45 and asymptomatic: proceed with the beta-blocker. Below 45: reduce or stop.
- Skip the evening dose in bradycardic patients.
- Use a cardiology-run center with IV metoprolol available.
- Before ordering Cleerly, ask whether the result will change management.
From Buzz in the chat, the longevitydocs™ Sunday newsletter, May 10, 2026. Member discussion, not clinical guidance.
Originally published in The Longevity Medicine Intelligence newsletter.
