Marked hyperCKemia without acute kidney injury after short-term overlapping analgesic exposure for low back pain: a case report and medication-timeline analysis

The Body's Silent Alarm: When Painkillers and Muscles Get Confused

Imagine your body is a bustling city. Inside this city, there are two very different types of emergency crews. One crew, the "Heart Patrol," keeps the main power plant (your heart) running smoothly. The other crew, the "Muscle Maintenance Team," fixes the roads and buildings (your muscles). Sometimes, when something goes wrong, the Maintenance Team sends out a flare—a chemical signal called Creatine Kinase (CK)—to say, "Hey, we're working hard over here!"

The tricky part is that this flare looks almost exactly like the one the Heart Patrol uses. If you see a flare in the sky, you might panic and think the power plant is on fire, when really, the road crew is just fixing a pothole. Doctors have to be detectives to figure out which crew is actually in trouble. This is especially important when people take medicine for pain. Sometimes, the mix of medicines we take to fix a sore back can accidentally make the Muscle Maintenance Team send out too many flares, making it look like a heart attack when it's actually just a muscle issue. This paper tells the story of one such mix-up, showing how doctors can use a timeline to solve the mystery and avoid unnecessary panic.

---

The Case of the Confused Flares

Meet a 27-year-old woman who was living her life until her lower back started acting up. She had lumbar pain, some tight muscles (myofasciitis), and a slipped disc. To fix this, on June 2, 2026, she went to a clinic and got a "pain-busting trio" of medicines: Panlongqi tablets, Jintiange capsules, and a special slow-release tablet mixing codeine and ibuprofen. She took them exactly as the instructions said, twice a day.

A few days later, things got weird. She didn't just have back pain; she felt bloated, nauseous, and had a weird "head heaviness." She also felt her heart racing and her chest getting tight. It sounded like a heart attack, right? But when she went to the hospital on June 6, the doctors found something surprising.

Her blood test showed a massive spike in Creatine Kinase (CK): 1997 U/L. That's about ten times higher than the normal limit! Usually, when you see a number that high, people scream "Heart Attack!" But the doctors looked closer. They checked the heart-specific markers: the high-sensitivity cardiac troponin I was normal (just 1.3 ng/L), and the CK-MB (the heart-specific part of the enzyme) was also in the normal range. Plus, an ultrasound of her heart showed it was pumping perfectly fine at 62%.

So, the "Heart Patrol" was actually fine. The flare was coming from the muscles. The diagnosis? Marked hyperCKemia (a fancy way of saying "way too much muscle enzyme") or perhaps very mild muscle breakdown (rhabdomyolysis), but crucially, without any damage to her kidneys. Her kidney function was rock solid, with a creatinine level of 61.9 µmol/L and an eGFR of 118.21 mL/min/1.73 m².

Solving the Mystery with a Timeline

The big question was: What caused this? Was it the ibuprofen? The codeine? The Chinese patent medicines? Or maybe a hidden virus?

The authors of this paper acted like detectives drawing a timeline. They realized that because the patient took three different medicines at the exact same time, it was impossible to point a finger at just one. It was like three people pushing a car at once; you can't say which single person made it move.

They also ruled out some suspects:

• The Heart: The normal troponin and heart ultrasound proved this wasn't a heart injury.
• The Kidneys: Her kidney numbers were perfect, so this wasn't a dangerous case of kidney failure.
• The "Later" Meds: She took other medicines (like Wangbi tablets) on June 9 and June 15, but those happened after the enzyme spike, so they couldn't be the cause.
• The Virus: She had a single positive test for a germ called Mycoplasma, but the paper says this was just a "possible confounder" (a red herring) and not proven to be the real culprit.

After stopping the suspected medicines and giving her supportive care, her CK levels dropped to 1123 U/L by June 8. They were still high, but going down. The paper concludes that the most honest answer is that she had suspected mild rhabdomyolysis triggered by the short-term mix of painkillers, but they cannot say for sure which specific drug did it.

The Takeaway: Don't Panic at the Flare

This story teaches us three big lessons for anyone dealing with back pain and medicine:

1. Check the Timeline: When a patient takes multiple pills at once, you can't just blame one. You have to map out exactly when they took what and when the symptoms started.
2. Don't Assume the Worst: Just because the muscle enzyme (CK) is high doesn't mean the heart is broken. You need the heart-specific tests (like troponin) to be sure. Otherwise, you might treat a muscle problem like a heart attack.
3. Watch the Kidneys: Even if the muscles are screaming, the kidneys might be fine. But doctors need to keep an eye on them just in case.

In the end, the paper doesn't claim to have found a "magic bullet" that proves codeine or ibuprofen always causes this. Instead, it suggests that for young people with back pain, a careful look at the medication timeline and specific blood tests can prevent a scary misdiagnosis. The patient recovered, her kidneys stayed safe, and the medical team learned that sometimes, the body's alarm system just needs a little help to tell the difference between a muscle ache and a heart emergency.