Healthcare ambulatory trajectory patterns in patients with psychotic disorders: a sequence analysis of the French National Health Data System
Using a nationwide French health database, this study identified five distinct ambulatory care trajectory patterns among patients with psychotic disorders, revealing that specialist cardiology follow-up is uncommon and that most patients either rely primarily on general practice or become disengaged from care.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
Imagine the human body as a bustling city, and the healthcare system as the network of roads, bridges, and traffic controllers keeping everything running. For most people, this city has a well-mapped grid: a general practitioner acts as the main traffic cop at the city center, while specialists like cardiologists (heart experts) and psychiatrists (mind experts) are the specialized engineers who fix specific problems when the main cop calls them in. But for people living with psychotic disorders—a condition where the mind's internal reality can become disconnected from the outside world—the map often gets scrambled. These individuals face a hidden crisis: they tend to die 15 to 20 years earlier than everyone else, and a huge chunk of that lost time is due to heart trouble. The big question isn't just if they get sick, but how they navigate the healthcare city. Do they get stuck in a dead-end alley, ignored by the specialists? Do they get shuttled between too many different offices? Or do they find a smooth, coordinated route that keeps their heart and mind safe? Understanding these "travel routes" is crucial because if we can see where the traffic jams happen, we can build better roads to keep people alive longer.
This paper acts like a giant, high-tech GPS tracker for 4,410 people in France who were newly diagnosed with psychotic disorders between 2016 and 2020. The researchers didn't just look at one doctor's visit; they followed these patients for three years, watching every time they visited a general practitioner (GP), a psychiatrist, or a cardiologist. They treated these visits like a string of beads, creating a unique "bead necklace" or trajectory for each person to see how their care unfolded over time. By using a clever computer method called sequence analysis, they sorted these thousands of necklaces into five distinct patterns, revealing that not everyone travels the same road.
The first and largest group, making up 39.1% of the travelers, was the "General Practice Dominant" crew. These folks were like loyal customers who only ever stopped at the main city hub (the GP) and never really visited the specialized engineering shops. They saw their GP about 28.5 times over three years, but they almost never saw a heart doctor (only 0.4 visits) or a private psychiatrist (4.8 visits). They were often middle-aged and carried a heavy load of other health problems, including heart disease, yet they seemed to rely entirely on their family doctor to manage it all.
Then there was the "Ambulatory Psychiatric" group (19.0%), who were the frequent flyers of the mental health wing. These patients had a busy schedule, seeing a psychiatrist an average of 65 times in three years, while still keeping up with their GP (25.6 visits). They were the ones who seemed to have their mental health care dialed in, but the study suggests their heart care might still be getting lost in the shuffle.
The third group was the "Cardiological Follow-up" team, a smaller but vital 6.0% of the travelers. These were the older passengers (average age 64.1) with the most complex medical needs, including a very high rate of heart disease (47.4%). They were the only group that actually made regular trips to the heart specialist (4.7 visits), in addition to seeing their GP often. They seemed to be the ones getting the full "all-access pass" to care, but they were a rare find.
The fourth and fifth groups were the ones the researchers were most worried about. The "Low-Intensity General Practice" group (15.5%) started out registered with a GP but slowly drifted away, visiting them only about 11 times in three years and barely seeing anyone else. They were like commuters who bought a transit pass but forgot to use it. The final group, the "Disengaged" (20.3%), was the most alarming. These patients were almost invisible to the outpatient system, seeing their GP only 3.2 times in three years, with more than a third of them having zero contact with a GP at all. They were effectively off the map, relying mostly on hospital visits when things got really bad, rather than getting help on the streets.
The researchers also tried to build a simple "rule of thumb" to predict which group a patient would fall into just by counting their visits. They found that if you wait two years, you can spot the patterns pretty well: if you've seen a heart doctor twice, you're likely in the "Cardiological" group; if you've seen a psychiatrist six times, you're likely "Ambulatory Psychiatric"; and if your GP visits are low, you might be drifting toward disengagement. However, the paper notes that this rule isn't perfect, especially for the "Low-Intensity" group, because their path is defined by slipping away rather than just having a low number of visits from the start.
Ultimately, the study suggests that while many patients with psychotic disorders are being seen by their family doctors, the system is failing to get them to the specialists they might need, particularly heart doctors. Only a tiny fraction (6%) of these patients actually get regular heart specialist care, even though they are at high risk. The authors point out that this "stepped" approach—where the GP is the first and often only stop—might not be enough for a population that needs extra protection. They don't claim to have solved the problem or proven that changing these routes will save lives yet, but they have drawn a very clear map showing exactly where the gaps are. The next step, they say, is to figure out if fixing these traffic patterns actually leads to better heart health outcomes.
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