Tuesday, October 6, 2026

The AI Psych Brief

🔬 Section 1

Psychiatric Research Article

Structural brain changes and clinical outcomes of patients with NMDA receptor encephalitis in Germany: a cross-sectional study

Krohn S, Cammà G, Zhao W, Romanello A, Wurdack K, Böken OJ, Rekers S, Paul F, Prüss H, Madan CR, Finke C · The Lancet Psychiatry · September 2026

The Charité group studied 70 patients with post-acute anti-NMDA receptor encephalitis (86% female, mean age 28) against 70 age- and sex-matched controls, a median of 22 months after onset. Patients improved dramatically from peak illness (median mRS 5 to 1), yet 67% still had residual symptoms, most often memory dysfunction (61%) and psychiatric symptoms (36%).

The psychiatric picture changed character over time: in patients with persistent symptoms it shifted from psychosis-dominant at peak to affective-dominant in the post-acute stage. On structural MRI, a fractal-dimensionality measure of cortical complexity was reduced bilaterally in the hippocampus and in a fronto-cingulo-temporal cluster, and the degree of change tracked both persistent psychiatric symptoms and poorer verbal and visuospatial memory.

💡 Why it matters

The psychiatrist's role in NMDAR encephalitis doesn't end when the psychosis clears: expect a later depressive and cognitive tail that is structurally grounded, and build post-acute follow-up for mood and memory rather than treating residual symptoms as a new primary illness.

Read the paper → doi:10.1016/S2215-0366(26)00191-4

🩺 Section 2

General Medicine Article

Telehealth Treatment of Anxiety in Patients With Low-Risk Chest Pain in the Emergency Department: The PACER Randomized Clinical Trial

Musey PI Jr, Kroenke K, Connors JN, Stump TE, Chernyak Y, Prather K, Montgomery C, Monahan PO · JAMA Internal Medicine · September 2026

Across 6 university EDs, 375 adults discharged after acute coronary syndrome was excluded, who screened positive for at least moderate anxiety (GAD-7 of 8 or more, or a positive PHQ panic screen), were randomized to primary care referral, peer-supported internet CBT, or therapist-delivered telehealth CBT. All arms got psychoeducation, and outcomes were followed for 12 months.

GAD-7 improved in every arm (4.3, 5.5 and 5.1 points), but only peer-supported iCBT beat primary care referral on the primary outcome, by 1.2 points (effect size 0.25) — rising to 2.8 points in patients with severe anxiety. Both CBT arms tripled the odds of patient-rated global improvement, while depression, somatization and disability did not differ between groups.

💡 Why it matters

Low-risk chest pain is often a missed anxiety or panic presentation, and a cheap, scalable digital CBT pathway started from the ED meaningfully helps the sickest of these patients. For C-L and ED psychiatry, this is an argument for screening at discharge rather than leaving the anxiety to a primary care referral that rarely lands.

Read the paper → doi:10.1001/jamainternmed.2026.4225

💊 Section 3

Psychiatric Fact

A carbapenem can empty a valproate level in a day — and more valproate won't refill it

Start meropenem, ertapenem or imipenem in a patient on valproate and the level typically falls 60 to 100 percent within 24 to 48 hours. The mechanism is not induction: valproate is largely glucuronidated, and a meaningful fraction of that glucuronide is normally hydrolysed back to active drug by acylpeptide hydrolase. Carbapenems irreversibly inhibit that enzyme, so the recycling loop stops and the glucuronide is simply excreted.

Two consequences change management. First, dose escalation does not work — you are pouring drug into a sink, and case series show levels staying subtherapeutic despite large increases. Second, because the inhibition is irreversible, recovery depends on new enzyme synthesis, and the effect lingers 7 to 14 days after the carbapenem stops. For a patient with bipolar disorder or a seizure disorder on the medical ward, the practical move is to ask ID for a non-carbapenem regimen, or bridge mood stabilization with another agent (an antipsychotic, or lithium if renal function allows) for the whole course plus two weeks — and recheck the level before assuming it is back.

🛋️ Section 4

Psychotherapy Teaching Pearl

When the staff start fighting, the patient's inner world has moved onto the unit

Tom Main's 1957 paper "The Ailment" described nurses who fell into bitter disagreement over a handful of patients, each camp convinced the other was harming them. Kernberg and Gabbard later framed this as splitting enacted through projective identification: a patient with borderline organization cannot hold the idealized and persecutory object relations together, so each is lodged in a different staff member, who then begins to feel and act the part. The staff conflict is not noise around the treatment — it is a map of the patient's internal world. The technical error is to adjudicate who is right. The move is to bring the split into a team meeting as data, have each side describe the patient they are seeing, and notice that both descriptions are true. Only once the team holds the whole picture can anyone interpret it to the patient without simply joining one side.

🗒️ Vignette

On an inpatient unit, the day nurse says a 26-year-old woman is manipulative and needs firm limits; the night nurse says she is a frightened girl the day staff are bullying. Each has begun documenting against the other. The resident, instead of ruling on the PRN and privilege dispute, asks both to present the patient at rounds. The contrast is striking and both accounts are accurate. The team agrees on one consistent plan and a single message. The resident then tells the patient: "It seems some of us feel like people who hurt you and some like people who rescue you. I wonder if it's hard for you to feel both about the same person." She is quiet, then says her mother was exactly like that.