A diagnostic cardiac catheterization is, for most patients, the shortest thing on the cardiology schedule. An hour or so in the lab, a small puncture in the wrist or the groin, a look at the coronary arteries, and home the same afternoon. It is also one of the most reliable generators of a nine o’clock phone call the night before — and the call is almost never about the heart.
It is about the hours immediately afterward. Somewhere in the packet the patient carried out of the office is a line about lying flat, and that line reads very differently at 9 p.m. than it did at 2 p.m. with a nurse in the room. A man scheduled for a 7 a.m. groin cath is trying to plan a driver, his wife’s work shift, and who picks up a grandchild at three. He wants a number of hours. His cardiologist knows it. The office closed at four.
That question sits in PrepQ’s cardiology answer library, phrased the way patients actually type it: “How long do I have to lie flat after a groin catheterization?” It is not a complication. It never justifies paging the interventional cardiologist on call. And it never stops being asked.
Here is the physician-written answer PrepQ delivers, by text or by voice, at whatever hour it arrives: “After a groin catheterization, you’ll usually need to lie flat and keep the leg still for a few hours so the access site can seal and heal. The exact time varies depending on how the site was closed. Your care team will tell you how long to stay flat and when it’s okay to move. It’s best to follow their specific instructions.”
Two things about that answer are worth naming. First, it does not invent the number the patient asked for — and it should not. Bed rest after femoral access depends on how the artery was closed: manual pressure, a vascular closure device, and radial access with a wrist band are three different recoveries, and a confident “six hours” would be a fabrication dressed up as help. Second, it tells him what he can act on tonight: this is a several-hour window, plan the afternoon around it, and your team will give you the exact time. That is enough to make the calls he needs to make before bed.
How the answers get written, and what never gets answered
Every answer in the library is written by physicians before it enters the system. When a practice subscribes, its own cardiologists review and approve the answer set for their procedures — and can edit any answer to match their protocols — before a single patient receives one. A group whose radial caths go home in two hours and whose femoral caths lie flat for six writes those numbers into its own answers, and that is what its patients get.
Just as importantly, some questions are never answered by the AI at all. A message describing chest pain, bleeding or a rapidly swelling lump at the access site, a leg or hand that has gone cold, pale, or numb below the puncture, or fainting carries urgent symptoms, and those escalate to the practice or to 911 rather than being handled by software. Questions with no physician-approved answer route the patient to the office instead of being improvised. The platform is HIPAA-eligible, and a Business Associate Agreement is available to subscribing practices.
Why cardiology absorbs so much of this after hours
Cardiology carries a combination that produces after-hours volume almost by design. The patients are medication-heavy, and nearly every procedure comes with a hold-or-continue instruction attached to a blood thinner, a diabetes medicine, or a rhythm drug. The procedures are overwhelmingly same-day, so discharge lands in the afternoon and the first recovery questions arrive that evening. And a large share of the panel is older, with an adult child or a spouse doing the actual logistics — which means the person with the questions at 9 p.m. is frequently not the person who sat in the office and heard the answers.
PrepQ’s cardiology library covers more than 89 procedures — diagnostic cardiac catheterization and coronary angiogram, PCI and coronary stenting, catheter ablation for AFib, pacemaker and ICD implantation, TAVR, cardioversion, and more — behind more than 624 physician-written answers, in English and Spanish.
The cost of those questions being unreachable shows up in two places. The morning after: a voicemail box a front desk works through instead of working with the patients in front of it. And the schedule itself, because the pre-procedure questions are the expensive ones. A misread fasting window, a medication held that should not have been, or a driver nobody arranged is a case that falls off a cath lab schedule at 6:45 a.m. Any dollar figure attached to closing that gap is a modeled estimate, not a measured customer result.
The distinguishing feature was never that software can produce an answer. What a cardiology practice needs is its answer — the one its own cardiologists stand behind — in the patient’s hand at nine at night, with the urgent cases pulled out and handed to a human being. PrepQ was built by practicing physicians, Keith Schmidt MD and Ryan Kuta DO, around that standard: correct, approved, and available 24 hours a day, 365 days a year. Everything here is educational information, not medical advice — patients should always follow their own physician’s instructions.