1.Causal effects of fluid intelligence on psychiatric disorders
Sunyeup KIM ; Gahyun KIM ; Minyoung KIM ; Kyung-Hun SUNG ; Seunghyup LEE ; Youngoh BAE ; Seung Won LEE
Precision and Future Medicine 2026;10(1):27-38
Purpose:
Fluid intelligence (FI), a core cognitive function involved in reasoning and problem-solving, has been linked to psychiatric outcomes in observational studies. However, causal inferences remain challenging due to confounding and reverse causation. This study aimed to investigate the causal effects of FI on 10 major psychiatric disorders using Mendelian randomization (MR).
Methods:
We performed a phenome-wide association study-based two-sample MR analysis to evaluate the effects of genetically proxied FI on 10 psychiatric disorders. Genome-wide association study summary statistics were obtained from large-scale European cohort studies. The inverse-variance-weighted method served as the primary analytical method, and complementary sensitivity analyses were conducted to assess pleiotropy and heterogeneity.
Results:
Higher FI was causally associated with a reduced risk of attention-deficit/hyperactivity disorder (ADHD) (odds ratio [OR], 0.72; P< 0.001), schizophrenia (OR, 0.69; P= 0.016), and post-traumatic stress disorder (PTSD) (OR, 0.93; P= 0.006). In contrast, FI was positively associated with an increased risk of autism spectrum disorder (ASD; OR, 1.43; P < 0.001) and anorexia nervosa (OR, 1.39; P= 0.005). No significant associations were observed for major depressive disorder, anxiety disorder, bipolar disorder, obsessive-compulsive disorder, or postpartum depression. Sensitivity analyses supported the robustness of these findings, with no evidence of directional pleiotropy or undue influence of individual single-nucleotide polymorphisms.
Conclusion
This study provides genetic evidence that higher FI exerts divergent causal effects across psychiatric disorders, protective in externalizing and stress-related conditions (ADHD, PTSD, and schizophrenia) but associated with an increased risk of neurodevelopmental and internalizing conditions (ASD and anorexia nervosa). These findings highlight the need for a nuanced understanding of cognitive capacity in psychiatric vulnerability and guide preventive strategies tailored to disorder-specific cognitive profiles.
2.Usefulness of neutrophil gelatinase-associated lipocalin(NGAL) to confirm subclinical acute kidney injury and renal prognosis in patients following surgery.
Se Jun PARK ; Hoseok KOO ; Kyoung Jin LEE ; Seo Hyun KIM ; Seo Young YUN ; Seunghyup KIM ; Dong Hee WHANG ; Shin Young JOO ; Byungmo LEE ; HoJun CHIN ; Sihyung PARK
Kosin Medical Journal 2017;32(2):212-220
OBJECTIVES: The neutrophil gelatinase-associated lipocalin (NGAL) level following non cardiac surgery is useful for predicting acute kidney damage. However, there is insufficient conclusive evidence as to whether NGAL can be used to predict subclinical AKI following non-cardiac surgery. METHODS: We measured serum NGAL and creatinine levels in 41 patients following non-cardiac surgery, and the increase of these variables was used to predict acute decreases in kidney function. RESULTS: The study included a total of 41 patients. The mean age was 64.65 ± 17.09 years. The serum creatinine concentration was increased 12 hours after surgery. The mean SD serum NGAL decreased after 4hours after surgery and continued to decrease after 12 hours after surgery. The incidence of subclinical AKI determined by the 4 hour serum NGAL level was 10(24.4%), and the incidence of serum creatinine elevation was 0(0.0%). The incidence of subclinical AKI determined by the 12 hour serum NGAL level was 4(9.8%), and the incidence of subclinical AKI determined by serum creatinine was 4(9.8%). The elevation of NGAL was more rapid than the serum creatinine 4 hours after surgery. CONCLUSIONS: We verified the usefulness of the serum NGAL level as a predictive factor for subclinical AKI after non-cardiac surgery.
Acute Kidney Injury*
;
Creatinine
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Humans
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Incidence
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Kidney
;
Lipocalins
;
Neutrophils*
;
Prognosis*
;
Thoracic Surgery
3.An Unusual Case of Proctitis and Rectal Abscess due to Irritants by Artemisia asiatica Smoke (Ssukjwahun).
Seunghyup KIM ; You Sun KIM ; Seo Hyun KIM ; Dong Hoon LEE ; Se Jun PARK ; Seo Young YUN ; Dae Young KIM ; Jeonghun LEE ; Jeong Seop MOON
The Korean Journal of Gastroenterology 2016;67(4):212-215
Proctitis is an inflammatory change of rectal mucosa induced by various agents or stimulus. Among many etiologies, it may be caused by medical treatments such as radiation or antibiotics. Proctitis usually presents with rectal ulcer but abscess formation is uncommon. Therapy using Ssukjwahun exerts its effect by directly applying the smoke around genital area and anus with various medicinal brewed herbs, especially worm-wood. Secondary metabolite of this plant, monoterpene, is known to facilitate circulation, exert anti-inflammatory effect, and help control pain. Herein, we report an unusual case of infectious proctitis presenting with rectal ulcer and abscess formation after perianal application of warm steam made by Artemisia asiatica smoke for treatment of dysmenorrhea.
Abdomen/diagnostic imaging
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Abscess/*diagnosis
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Adult
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Artemisia/*chemistry/metabolism
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Female
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Humans
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Proctitis/*diagnosis/etiology
;
Rectum/diagnostic imaging
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Sigmoidoscopy
;
Smoke/*adverse effects
;
Tomography, X-Ray Computed
;
Ultrasonography

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