OOIR: Observatory of International Research

Papers

(The TQCC of Perioperative Medicine is 5. The table below lists those papers that are above that threshold based on CrossRef citation counts [max. 250 papers]. The publications cover those that have been published in the past four years, i.e., from 2022-05-01 to 2026-05-01.)

Article	Citations
The impact of preoperative stroke on 1-year mortality and days at home alive after major surgery: an observational cohort study	56
Frailty in the over 65’s undergoing elective surgery (FIT-65) – a three-day study examining the prevalence of frailty in patients presenting for elective surgery	35
Intraoperative findings and predictors for length of hospital stay among elderly patients undergoing emergency exploratory laparotomy: a multi-centre prospective study	31
Preoperative neutrophil–to–lymphocyte ratio after chemoradiotherapy for esophageal squamous cell carcinoma associates with postoperative pulmonary complications following radical esophagectomy	26
Perioperative anesthesia management of GLP-1 receptor agonists: a systematic review of potential risks	25
A comparison of ClearSight noninvasive cardiac output and pulmonary artery bolus thermodilution cardiac output in cardiac surgery patients	25
The effect of abdominal massage applied after surgery on gastrointestinal symptoms and comfort level	24
Cardiopulmonary exercise testing before and after intravenous iron in preoperative patients: a prospective clinical study	20
Postoperative and postdischarge nausea and vomiting following ambulatory eye, head, and neck surgeries: a retrospective cohort study comparing incidence and associated factors	19
Antibiotic prophylaxis in emergency cholecystectomy for mild to moderate acute cholecystitis: a systematic review and meta-analysis of randomized controlled trials	18
Efficacy and safety of perioperative use of non-steroidal anti-inflammatory drugs for preemptive analgesia in lumbar spine surgery: a systematic review and meta-analysis	17
Effect of butorphanol nasal spray administration on patient cooperativity during labor epidural placement: a single-center randomized controlled trial	17
Preeclamptic heart failure — perioperative concerns and management: a narrative review	16
Use of colloids and crystalloids for perioperative clinical infusion management in cardiac surgery patients and postoperative outcomes: a meta-analysis	16
Perioperative bronchoaspiration in a semaglutide user on a residue-free diet: a case report and insights from a complication	15
Effect of age and gender on pre-operative cardiovascular risk assessment	15
Hypotension prediction index for prevention of intraoperative hypotension in patients undergoing general anesthesia: a randomized controlled trial	15
Effect of transversus abdominis plane block versus intravenous hydromorphone on the quality of postoperative recovery in elderly critically Ill patients in the SICU: a single-center, single-blind, ran	15
Refining postoperative quality metrics: risk factors for emergency department visits within 3 days after hemorrhoidectomy	14
Prehabilitation for patients with colorectal cancer: a snapshot of current daily practice in Dutch hospitals	14
Postoperative short-term use of the nonsteroidal anti-inflammatory drug flurbiprofen did not increase the anastomotic leakage rate in patients undergoing elective gastrointestinal surgery—a retrospect	14
Preoperative moderate to severe anemia is associated with increased postoperative major adverse cardiac and cerebral events and pulmonary complications: a propensity score-matched analysis in hip frac	14
A comparative study on the effect of dopamine vs phenylephrine in improving the cutaneous analgesic effect of mexiletine in rats	13
Post-surgical DKA stems from poor glycemic control prior to surgery and perioperative catecholamine usage: unmatched case–control study	13
RAPID-CHD pathway improves clinical outcomes in neonates with congenital heart disease	13

Clinical covariates that improve surgical risk prediction and guide targeted prehabilitation: an exploratory, retrospective cohort study of major colorectal cancer surgery patients evaluated with preo	12
Higher rate of undetected intraoperative damage of latex-free surgical gloves worn by scrub nurses	12
The effect of restrictive vs. liberal fluid protocols on ocular parameters in patients undergoing prone spine surgery: a randomized controlled trial	12
Simplified rapid hydration and contrast-associated acute kidney injury among CKD patients stratified by Mehran score: sub-analysis from the TIME Trial	12
Evaluation of fluid responsiveness with dynamic superior vena cava collapsibility index in mechanically ventilated patients	12
Magnitude of early postoperative hypoxemia and its associated factors among adult patients who undergo emergency surgery under general anesthesia at Jimma Medical Center, Jimma, Southwest Ethiopia, 20	11
Synthetic colloids as priming fluids in cardiopulmonary bypass and postoperative acute kidney injury: a propensity score-matched study	11
Influence of portal hypertension-associated upper gastrointestinal bleeding and acute kidney injury on liver transplantation prognosis	11
Hemolysis during open heart surgery in patients with hereditary spherocytosis — systematic review of the literature and case study	10
Outpatient compared to inpatient thyroidectomy on 30-day postoperative outcomes: a national propensity matched analysis	10
Intraoperative mild hyperoxia may be associated with improved survival after off-pump coronary artery bypass grafting: a retrospective observational study	10
Nomogram for predicting the risk of postoperative delirium in elderly patients undergoing orthopedic surgery	10
The incidence of postoperative vasopressor usage: protocol for a prospective international observational cohort study (SQUEEZE)	10
Prehabilitation in high-risk patients scheduled for major abdominal cancer surgery: a feasibility study	10
Prevalence and predictors of hypertension among patients undergoing preanesthesia evaluation at Bahir Dar University Tibebe Ghion Specialized Hospital in 2025: a cross-sectional study	9
Evaluating a pre-surgical health optimisation programme: a feasibility study	9
Analgesic efficacy and safety of methylene blue combined with cocktail for periarticular infiltration following total knee arthroplasty: a prospective, randomized, controlled study	9
How is postoperative pain after hip and knee replacement managed? An analysis of two large hospitals in Australia	9
Relationship between endotoxin core and staphylococcal antibody levels and outcome following transcatheter aortic valve implantation (TAVI)	9
Performance of the early warning system score in predicting postoperative complications in older versus younger patients	9
Sensitivity and specificity of the question “do you have any concerns regarding your mouth related to undergoing surgery?” for predicting perioperative oral health problems in patients with primary es	9
Application of high-flow nasal oxygen during anesthesia induction for frame-based stereoelectroencephalography: a randomized controlled non-inferiority trial	9
Treatment of iron deficiency in patients scheduled for pancreatic surgery: implications for daily prehabilitation practice in pancreatic surgery	9
Ultrasound-guided iliopsoas plane block combined with lateral femoral cutaneous nerve block for postoperative analgesia in hip arthroplasty: a retrospective case series	9
Advancing care of the vulnerable and failing RV in the perioperative period	8
A systematic review and meta-analysis of thoracic epidural analgesia versus other analgesic techniques in patients post-oesophagectomy	8
Protocol: dexmedetomidine on myocardial injury after noncardiac surgery—a multicenter, double-blind, controlled trial	8
Enhanced recovery after caesarean section: an intrathecal morphine dosing study	8
Perioperative management of the vulnerable and failing right ventricle	8
Understanding ophthalmologists’ perspectives on the risk of cataract surgery	8
The impact of frailty on functional recovery after cardiac surgery—a case control study	8
“A breach in the protocol for no good reason”: a surgical antimicrobial prophylaxis experience in an Ethiopian academic medical center	8
Development of risk prediction model for chronic pain after knee replacement surgery: protocol for an individual patient data meta-analysis	8
Perioperative remimazolam administration to prevent delirium and neurocognitive disorders after surgery: a systematic review and meta-analysis	8
The impact of glucagon-like peptide-1 receptor agonists in the patients undergoing anesthesia or sedation: systematic review and meta-analysis	7
Pulmonary function testing in preoperative high-risk patients	7
Days at home alive after major surgery in patients with and without diabetes: an observational cohort study	7
Prediction of mortality in secondary peritonitis: a prospective study comparing p-POSSUM, Mannheim Peritonitis Index, and Jabalpur Peritonitis Index	7
Dosage of epidural morphine analgesia after lower abdominal cancer surgery: a randomized clinical trial among the older adults	7
Perioperative Quality Initiative (POQI) consensus statement on perioperative assessment of right ventricular function	7
Mismatch of populations between randomised controlled trials of perioperative interventions in major abdominal surgery and current clinical practice	7
The lived experiences of operating room nurses from the surgery on COVID-19 patients: a phenomenological study	7
Opioid-free versus opioid-based anesthesia in laparoscopic sleeve gastrectomy: a single-center, randomized, controlled trial	7
Comparison of two 3D scanning software to identify facial features: a prospective instrument to predict difficult airway	7
Factors associated with early inhospital adverse outcome following surgery for acute appendicitis in Uganda: a multicenter cohort	7
Cerebral oxygenation when ventilated or spontaneously breathing: a randomised control trial	7
Response to a prehabilitation program for patients with oesophageal cancer: an observational study	7
Effect of the preoperative physical status on postoperative nausea and vomiting risk: a matched cohort study	6
Review of cancer therapies for the perioperative physician	6
Comparison of different pain management strategies during the perioperative period of esophageal squamous cell carcinoma: a retrospective cohort study	6

Hypothyroidism as a risk factor for perioperative complications in lumbar spine surgery: a national database study	6
Early postoperative serum aspartate aminotransferase for prediction of post-hepatectomy liver failure	6
Essential right heart physiology for the perioperative practitioner POQI IX: current perspectives on the right heart in the perioperative period	6
Incidence of intraoperative hypotension during non-cardiac surgery in community anesthesia practice: a retrospective observational analysis	6
Recurrence-free survival after curative resection of non-small cell lung cancer between inhalational gas anesthesia and propofol-based total intravenous anesthesia: a multicenter, randomized, clinical	6
A predictive tool for early identification of moderate-to-severe pain following open colorectal surgery in older adults: a retrospective cohort study	6
Perioperative myocardial injury is associated with increased postoperative non-cardiac complications in patients undergoing vascular surgery: a post hoc analysis of a randomised clinical pilot trial	6
Decreasing the pressure of endotracheal tube cuff slowly with a constant speed can decrease coughing incidence during extubation: a randomized clinical trial	6
Correction: The impact of preoperative stroke on 1-year mortality and days at home alive after major surgery: an observational cohort study	6
Effect of sedative premedication with oral midazolam on postanesthesia care unit delirium in older adults: a secondary analysis following an uncontrolled before-after design	6
Dexmedetomidine-enhanced chest wall fascial plane blocks in ultra-fast-track minimally invasive heart valve surgery: a randomized controlled trial	6
Temperature effect on coagulation function in mild hypothermic patients undergoing thoracic surgeries: thromboelastography (TEG) versus standard tests	6
Epidemiology of perioperative RV dysfunction: risk factors, incidence, and clinical implications	6
Geriatric nutritional risk index and prognostic nutritional index improves predictive value of postoperative mortality: a large-scale retrospective cohort study	6
The impact of sugammadex versus neostigmine reversal on return to intended oncological therapy-related outcomes after breast cancer surgery: a retrospective cohort study	6
Effect of pulmonary rehabilitation on lung cancer surgery outcomes: a matched-case analysis	6
Effect of remimazolam versus propofol anesthesia on postoperative delirium in neurovascular surgery: study protocol for a randomized controlled, non-inferiority trial	5
Perioperative capacity and contextual challenges in teaching hospitals of southern Ethiopia: explanatory sequential mixed-methods research	5
Correction: Data integrity issues: catalyst for a more robust approach to research on perioperative oxygen therapy?	5
Correction: The effects of neoadjuvant chemoradiotherapy and an in-hospital exercise training programme on physical fitness and quality of life in locally advanced rectal cancer patients: a randomised	5
AcumenTM hypotension prediction index guidance for prevention and treatment of hypotension in noncardiac surgery: a prospective, single-arm, multicenter trial	5
Experience sharing on perioperative clinical management of gastric cancer patients based on the “China Robotic Gastric Cancer Surgery Guidelines”	5
Effect of ultrasound-guided lung recruitment to reduce pulmonary atelectasis after non-cardiac surgery under general anesthesia: a systematic review and meta-analysis of randomized controlled trials	5
Comparison of tramadol and lornoxicam for the prevention of postoperative catheter-related bladder discomfort: a randomized controlled trial	5
Effect of preoperative intranasal insulin on postoperative delirium in adult surgical patients: a systematic review, meta-analysis, and trial sequential analysis	5
Efficacy of preoperative single-dose dexamethasone in preventing postoperative pulmonary complications following minimally invasive esophagectomy: a retrospective propensity score-matched study	5
In-hospital mortality of patients requiring unplanned postoperative ventilatory support: a multicenter observational study	5
Retrolaminar versus erector spinae plane block for enhanced recovery after cesarean section: a retrospective study	5
Validity of the I‑FEED classification in assessing postoperative gastrointestinal impairment in patients undergoing elective lumbar spinal surgery with general anesthesia: a prospective observational	5
Preoperative endothelial dysfunction for the prediction of acute kidney injury after cardiac surgery using cardiopulmonary bypass: a pilot study based on a second analysis of the MONS study	5
Multimodal prehabilitation in patients with non-small cell lung cancer undergoing anatomical resection: protocol of a non-randomised feasibility study	5
The effect of goal-directed crystalloid versus colloid administration on postoperative spirometry parameters: a substudy of a randomized controlled clinical trial	5