Clinical trial Recruiting at 37 sites Observational Ages 18 and up

Assessing the impact of comorbidities on postoperative complications.

Official title: The Role of Concomitant Diseases in Postoperative Complications Risk Stratification - a Prospective Observational Multi-center Cohort Study

Run by Russian Federation of Anesthesiologists and Reanimatologists · NCT03945968 · Data updated 2026-11-12

This study looks at how having other health issues affects the chances of complications after abdominal surgery to help doctors better understand and manage risks for their patients.

Quick facts

Study typeObservational
Ages18 Years and up
SexAll
Enrollment16000 (estimated)
SponsorRussian Federation of Anesthesiologists and Reanimatologists
Academic / other
Locations38 sites (Arkhangelsk and 37 other locations)
StatusRecruiting
StartedJuly 1, 2019
Main results expectedDecember 30, 2025
Study endsFebruary 28, 2026
Registry record updatedApril 4, 2025
Trial IDNCT03945968 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates for this study are patients scheduled for abdominal surgery with an ASA physical status class of 1-3.

Probably not a fit

Patients with acute conditions such as massive blood loss, bronchospasm, or anaphylactic reactions may not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This observational study aims to evaluate the prevalence and structure of comorbidities among patients undergoing abdominal surgery. It seeks to stratify the risk of postoperative complications by identifying independent predictors that contribute to these risks. By analyzing a large cohort of surgical patients, the study will provide insights into how concomitant diseases affect surgical outcomes and mortality rates. The findings could help in developing better risk assessment tools for anesthesiologists and surgeons.

Why it matters

Potential benefit: If successful, this study could lead to improved risk stratification and management of patients undergoing surgery, potentially reducing postoperative complications.

How similar studies have gone: Previous studies have indicated the importance of comorbidities in surgical outcomes, suggesting that this approach has been validated in other contexts.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* surgical interventions on the abdominal organs,
* 1-3 ASA physical status class

Exclusion Criteria:

* the inability to assess the factors included in the study,
* acute massive blood loss, aspiration,
* bronchospasm,
* anaphylactic reactions,
* malignant hyperthermia

Where it's running

  • The First City Clinical Hospital. n.a. E. E. Volosevich
    Arkhangelsk, Russia
    Recruiting
  • Astrakhan State Medical University
    Astrakhan, Russia
    Recruiting
  • Chelyabinsk Regional Clinical Center of Oncology and Nuclear Medicine
    Chelyabinsk, Russia
    Recruiting
  • South-Ural State Medical University
    Chelyabinsk, Russia
    Recruiting
  • Chita state medical Academy of the Ministry of health of the Russian Federation
    Chita, Russia
    Recruiting
  • Kazan State Medical University
    Kazan', Russia
    Recruiting
Show 32 more locations
  • Republic Clinical Hospital Ministry of Health care of the Republic of Tatarstan
    Kazan', Russia
    Recruiting
  • Research Institute for Complex Issues of Cardiovascular Diseases
    Kemerovo, Russia
    Recruiting
  • Regional clinical hospital №2
    Krasnodar, Russia
    Recruiting
  • Kuban State Medical University
    Krasnodar, Russia
    Recruiting
  • Research Institute Regional Clinical Hospital named after S.V. Ochapovsky
    Krasnodar, Russia
    Recruiting
  • Krasnoyarsk State Medical University named after Prof. V.F.Voino-Yasenetsky
    Krasnoyarsk, Russia
    Recruiting
  • Burnasyan federal medical biophysical center of federal medical biological agency
    Moscow, Russia
    Recruiting
  • City clinical hospital named after S.S. Yudin
    Moscow, Russia
    Recruiting
  • City clinical hospital №1 named after N.I. Pirogov
    Moscow, Russia
    Recruiting
  • City Clinical Hospital. n.a. F.I. Inozemtseva
    Moscow, Russia
    Recruiting
  • FGBU "Central clinical hospital with polyclinic" of the President administration of the Russian Federation
    Moscow, Russia
    Recruiting
  • Moscow cancer research Institute named after P. A. Herzen
    Moscow, Russia
    Recruiting
  • Moscow City Oncological Hospital № 62
    Moscow, Russia
    Recruiting
  • Moscow regional research clinical Institute named after M. F. Vladimirsky
    Moscow, Russia
    Recruiting
  • National Medical and Surgical Center named after N.I. Pirogov
    Moscow, Russia
    Recruiting
  • Privolzhsky district medical center
    Nizhny Novgorod, Russia
    Recruiting
  • State Novosibirsk Regional Clinical Hospital
    Novosibirsk, Russia
    Recruiting
  • Orenburg Regional Clinical Hospital
    Orenburg, Russia
    Recruiting
  • "Republican hospital named after V. A. Baranov"
    Petrozavodsk, Russia
    Recruiting
  • Rostov State Medical University
    Rostov-on-Don, Russia
    Recruiting
  • North-West State Medical University named after I.I.Mechnikov
    Saint Petersburg, Russia
    Recruiting
  • St. Petersburg state budgetary healthcare institution " City clinical Oncology dispensary"
    Saint Petersburg, Russia
    Recruiting
  • "Samara Regional Clinical Oncology Dispensary"
    Samara, Russia
    Recruiting
  • Clinical Hospital named after SR. Mirotvortseva (FGBOU VO "Saratov State Medical University. n.a. V.I.Razumovsky" Ministry of Health of the Russian Federation
    Saratov, Russia
    Recruiting
  • Stavropol regional clinical hospital
    Stavropol, Russia
    Recruiting
  • Regional clinical hospital №2
    Vladivostok, Russia
    Recruiting
  • Emergency hospital
    Volgograd, Russia
    Recruiting
  • Volgograd regional clinical hospital
    Volgograd, Russia
    Recruiting
  • Yakut Republican Oncological Dispensary
    Yakutsk, Russia
    Recruiting
  • Ekaterinburg City clinical hospital № 40
    Yekaterinburg, Russia
    Recruiting
  • Sverdlovsk regional clinicl hospital №1
    Yekaterinburg, Russia
    Recruiting
  • Regional Clinical Hospital No. 1
    Tyumen, Russia
    Not yet recruiting

Study contacts

  • Principal investigator: Igor Zabolotskikh, MD — Russian Federation of Anesthesiologists and Reanimatologists
  • Study coordinator: Nikita Trembach, PhD
  • Email: nikitkax@mail.ru
  • Phone: +79528589299

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.