EXECUTIVE SUMMARY FOR EXPERT REVIEWERS

BẢN TÓM TẮT DÀNH CHO CHUYÊN GIA

DOCUMENT A.3 — THE GLOBAL HOW GAP

Why complex chronic multimorbidity is not served by existing single-disease guidelines

Nguyen Dinh Quang — Vien gut Model

March 2026 — Ho Chi Minh City, Vietnam

1. Context

A.1 has identified the structural break in the EBM chain. A.2 has defined the three layers: WHAT–HOW–DATA-to-operate. Document A.3 provides international evidence confirming: the HOW gap exists on a global scale, it is not an issue unique to Vien gut or gout [1].

2. Scale of the problem — complex chronic multimorbidity is a global reality

Source	Key findings
Barnett 2012	1.7 million Scottish patients: 42% of adults have ≥2 chronic conditions; >80% in the over-80 age group. Low-income group: multimorbidity appears 10–15 years earlier [2].
WHO 2023	>60% of the global disease burden comes from non-communicable chronic diseases, mostly multimorbidity [2].
UN 2011	Political declaration: non-communicable diseases are a major 21st-century challenge, calling on 194 countries to develop national plans [2].
Vietnam 2015	Decision 376/QD-TTg: non-communicable diseases account for 73% of deaths and 66% of the national disease burden [2].

Structural Paradox: disease has shifted to multimorbidity, but health systems — from physician training and specialty organization to guideline development — still operate on a single-disease model [3].

3. Comparison of two international document sources

3.1. Single-disease Guidelines: Solid WHAT, non-existent HOW for multimorbidity

EULAR/ACR (gout), KDIGO (CKD), ESC (heart failure), EASL (cirrhosis) all provide excellent WHAT. But no guideline describes HOW when these four guidelines are applied simultaneously to one patient — who coordinates, in what order, through what conflict resolution mechanism, with what longitudinal data [3].

3.2. International consensus on multimorbidity: acknowledging the gap but yet to fill it

Source	Contributions and limitations
NICE NG56 (2016)	The world’s first guideline on multimorbidity. Acknowledges that single-disease guidelines are inappropriate; recommends reducing treatment burden and having a coordinator — but does not provide a specific HOW [4].
JA-CHRODIS (2016)	Pan-European consensus: fragmented care is harmful. Requires clearly designated family doctors and nurses — but does not describe the integrated operational workflow [4].
WHO ICOPE (2016)	Framework on Integrated, People-Centred Health Services. Principles are correct — but lacks a HOW for complex chronic multimorbidity in outpatient LMIC settings [4].
Hughes 2013	Applying multiple single-disease guidelines simultaneously creates an overwhelming treatment burden even at moderate levels [5].
Muth 2019	>10 years of acknowledging single-disease guidelines are inappropriate, yet integrated clinical decision support is still severely lacking [5].

4. Clinical consequences of the HOW gap

Consequence	Evidence	Source
Inappropriate medication + mortality	Cohort of 4.7 million Danish citizens: fragmentation independently associated with increased PIM and mortality	Jiang/Prior 2023 [5]
Increased emergencies + costs	Systematic review: fragmentation increases emergency visits, duplicate testing, and overall costs	Jiang 2023 [5, 6]
Patients left to self-coordinate	Conflicting information, lack of overall responsibility, exhaustion from self-coordinating	Schiøtz 2017; Liddy 2014 [6]
Physician stress: guidelines vs. reality	GPs report stress between applying single-disease guidelines and the risk of causing harm	Johansen 2020 [6]

5. Four structural characteristics of the HOW gap

6. Conclusion

The HOW gap in complex chronic multimorbidity care has been acknowledged by NICE, WHO, JA-CHRODIS, and numerous international studies. Measurable consequences include inappropriate medication, increased mortality, more emergency visits, higher costs, and lost windows of opportunity. What remained unachieved — until the Vien gut Model systematized 18 years of practice — is the construction of a specific, structured HOW + DATA-to-operate architecture, which has been operationalized and verified on complex chronic multimorbidity patients in an outpatient setting [7].

Vien gut Model does not deny guidelines — WHAT is fully adhered to. What the model adds are two layers that guidelines do not provide: HOW and DATA-to-operate [8].

REFERENCES (shortened)

1. Barnett K, et al. Epidemiology of multimorbidity. Lancet. 2012;380(9836):37–43 [8].
2. WHO. Global Action Plan for NCD 2013–2030. Geneva: WHO; 2023 [8].
3. NICE. Multimorbidity (NG56). 2016 (updated 2023) [8].
4. Onder G, et al.; JA-CHRODIS. Health Policy. 2015;119(12):1513–1520 [8].
5. WHO. Framework on Integrated, People-Centred Health Services. 2016 [8].
6. Hughes LD, et al. Guidelines for people not for diseases. Age Ageing. 2013;42(1):62–69 [9].
7. Muth C, et al. Evidence supporting best clinical management of multimorbidity. J Intern Med. 2019;285(3):272–288 [9].
8. Prior A, et al. Healthcare fragmentation, multimorbidity, PIM, and mortality. BMC Med. 2023;21(1):305 [9].
9. Tinetti ME, et al. Potential pitfalls of disease-specific guidelines. N Engl J Med. 2004;351(27):2870–2874 [9].

Note: Full list (20 documents): see the full version of Document A.3 [9].

Vien gut is ready to share the entire model with the international medical community as a public asset, serving the goal of improving complex chronic multimorbidity care in 129 low- and middle-income countries [9].

Full Document System: A.0–A.5 | B.1–B.5 | C.1–C.4 | Part D [10]