Clinical Evidence

Evidence Base & References

Every figure SynaptoFlow cites comes from peer-reviewed published literature, and every source is listed on this page. We have not run a prospective trial of our own. Where a number is a projection rather than a measurement, it says so.

25%

Cancellation rate, Ayub Teaching Hospital

Zafar et al. prospectively audited 3,756 scheduled elective general surgical cases at ATH, Abbottabad. 936 were cancelled, a 25% rate. Of the avoidable cancellations, 43% were attributed to patient preparation failures rather than hospital-side factors such as theatre availability or staffing.

43%

Patient-Related Avoidable Cancellations

Of all avoidable cancellations at ATH, 43% were caused by poor patient preparation: uncontrolled BP, labs not done, medications not stopped. Every one of them was preventable.

25%

Cancellation rate, Ayub Teaching Hospital

Zafar et al. (J Ayub Med Coll Abbottabad, 2007) prospectively audited elective general surgical cases across three units at ATH. One in four scheduled operations was cancelled; 43% of avoidable cancellations were attributed to patient preparation failures rather than hospital-side factors.

Methodology

SynaptoFlow projections are estimated using a transparent, three-step approach grounded in published literature:

1.Cancellation rate baseline. Published day-of-surgery cancellation rates in high-income countries range from 1% to 24%, with most centers below 10%. Reported avoidable proportions range from roughly 60% to 80%. Because the spread is wide, surgeons should substitute their own audit numbers in the ROI calculator rather than rely on a published average.

2.Intervention effect range. Patient-facing digital pre-op tools and structured audit + feedback interventions consistently produce measurable adherence improvements in published literature (see references 5 and 6 below). We project a conservative 30 to 50% reduction in patient-related cancellations as a working estimate, pending prospective data from our own design partners.

3.Cost per cancellation. We use the AKUH 2025 published package rate for laparoscopic cholecystectomy (approximately PKR 277,000) as the facility-cost reference for Pakistani institutions. The ROI calculator accepts any case-fee value you enter, and we recommend you enter your own published rate.

Important:These figures are projections based on published literature in comparable settings. SynaptoFlow has not yet conducted a prospective controlled trial. The design partner program is intended to generate the first prospective outcome data. Results will vary by setting and patient population.

References

All references include journal source and DOI or PubMed identifier where available

International Literature · Cancellation Rate

Cancelled elective general surgical operations in Ayub Teaching Hospital

A prospective audit of all cancelled elective surgical cases across three general surgical units at Ayub Teaching Hospital, Abbottabad over 12 months (July 2006 to June 2007). Of 3,756 scheduled cases, 936 (25%) were cancelled. Of avoidable cancellations, 43% were patient-related, including poor preparation, uncontrolled medical conditions, and failure to comply with pre-operative instructions.

Journal: Journal of Ayub Medical College Abbottabad

Citation: Zafar A, Mufti TS, Griffin S, Ahmed S, Ansari JA. Cancelled elective general surgical operations in Ayub Teaching Hospital. J Ayub Med Coll Abbottabad. 2007 Jul to Sep;19(3):64 to 6.

Source: https://pubmed.ncbi.nlm.nih.gov/18444594/

Primary source for the 25% cancellation rate and 43% patient-related avoidable cancellation figures. Study conducted at the hospital where SynaptoFlow is being piloted.

Pre-op Preparation Failure as a Cause of Cancellation

Reasons for cancellations of elective surgical procedures

A multi-site analysis of elective surgery cancellations identifying patient-related causes including failure to follow pre-operative instructions, uncontrolled comorbidities (especially hypertension), and inadequate fasting. Patient-related issues consistently rank in the top three causes of last-minute cancellation across published audits.

Journal: Annals of the Royal College of Surgeons of England

Citation: Schofield WN, Rubin GL, Piza M, et al. Cancellation of operations on the day of intended surgery at a major Australian referral hospital. Med J Aust. 2005;182(12):612 to 615.

Source: https://pubmed.ncbi.nlm.nih.gov/15963015/

Establishes patient preparation failure as a globally recognised cause of cancellation, not specific to one region.

WHO Surgical Safety Checklist · Outcomes

A surgical safety checklist to reduce morbidity and mortality in a global population

The landmark eight-country prospective study of the WHO Surgical Safety Checklist. Implementation reduced the rate of major complications from 11.0% to 7.0% and inpatient deaths from 1.5% to 0.8%. Demonstrated that structured pre-procedure verification meaningfully changes outcomes.

Journal: New England Journal of Medicine

Citation: Haynes AB, Weiser TG, Berry WR, et al. A surgical safety checklist to reduce morbidity and mortality in a global population. N Engl J Med. 2009;360(5):491 to 499.

Source: https://doi.org/10.1056/NEJMsa0810119

Establishes the principle that structured pre-procedure compliance verification reduces complications and mortality. SynaptoFlow extends this principle from intra-op to the pre-op preparation window.

Patient-Facing Digital Pre-Op Tools · Systematic Review

Apps for improving preoperative patient preparation: systematic review

A systematic review of mobile applications and digital tools designed to improve patient pre-operative preparation. Reports that patient-facing digital tools consistently improve adherence to pre-op instructions across the studies reviewed, with positive directional effects on knowledge retention, anxiety reduction, and instruction follow-through.

Journal: Journal of Medical Internet Research

Citation: Waller A, Forshaw K, Carey M, et al. Optimizing patient preparation and surgical experience using eHealth: systematic review. JMIR Perioper Med. 2018;1(1):e5.

Source: https://pubmed.ncbi.nlm.nih.gov/33401365/

Most directly comparable category of intervention to SynaptoFlow. Establishes the evidence base for patient-facing digital pre-op compliance tools.

Compliance Audit + Feedback · Effect Size

Audit and feedback: effects on professional practice and healthcare outcomes

A Cochrane systematic review of 140 studies examining audit and feedback as a quality improvement intervention. Reports a median absolute improvement in adherence of 4.3% (interquartile range 0.5 to 16%) across professional practice outcomes. Feedback that is structured, recurrent, and individualised consistently produces the largest gains.

Journal: Cochrane Database of Systematic Reviews

Citation: Ivers N, Jamtvedt G, Flottorp S, et al. Audit and feedback: effects on professional practice and healthcare outcomes. Cochrane Database Syst Rev. 2012;(6):CD000259.

Source: https://doi.org/10.1002/14651858.CD000259.pub3

Frames the realistic effect size SynaptoFlow can claim. We project 14 to 35 percentage points based on combining audit/feedback effects with structured patient-facing intervention.

Economic · Cost of Surgical Cancellation

Financial implications of surgical cancellations

Reports that day-of-surgery cancellations carry significant direct OR cost, lost-revenue, and rebooking-overhead implications. Cost per cancelled case varies by setting, procedure, and country, with multiple international audits placing the figure between USD 1,500 and 4,000 per case in OECD systems.

Journal: Health Policy

Citation: Dimitriadis PA, Iyer S, Evgeniou E. The challenge of cancellations on the day of surgery. Int J Surg. 2013;11(10):1126 to 1130.

Source: https://doi.org/10.1016/j.ijsu.2013.09.002

Basis for the cost-of-cancellation figure in SynaptoFlow ROI projections. The /roi page accepts a user-entered case fee rather than applying this figure directly.

Forward-looking projections notice:The compliance improvement figures cited by SynaptoFlow are estimates derived from published literature in comparable settings, not from a controlled trial of SynaptoFlow itself.

We are committed to conducting prospective outcome studies as our user base grows. Healthcare providers should evaluate SynaptoFlow based on their own clinical experience and patient population.

Full references available upon request: synaptonex@gmail.com

SynaptoFlow · SynaptoNex