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Helicobacter pylori infection: a risk factor for upper gastrointestinal bleeding after cardiac surgery?
Insights
Helicobacter pylori (H. pylori) infection is not linked to upper gastrointestinal bleeding in critically ill cardiac surgery patients receiving prophylaxis. Prolonged mechanical ventilation significantly increases bleeding risk.
Area of Science:
- Critical Care Medicine
- Gastroenterology
- Cardiac Surgery
Background:
- Upper gastrointestinal bleeding is a serious complication in critically ill patients post-cardiac surgery.
- Helicobacter pylori (H. pylori) is a known cause of gastrointestinal issues, but its role in this specific patient population is unclear.
- Stress ulcer prophylaxis is standard care, potentially influencing bleeding risk factors.
Purpose of the Study:
- To investigate the prevalence of H. pylori infection in critically ill patients experiencing upper gastrointestinal bleeding after cardiac surgery.
- To identify other risk factors associated with upper gastrointestinal bleeding in this cohort.
- To evaluate the necessity of prophylactic H. pylori eradication.
Main Methods:
- Prospective, single-center cohort study conducted in a university hospital's surgical intensive care unit.
- Serological testing for H. pylori infection in patients with upper gastrointestinal bleeding and a control group.
- Analysis of risk factors including duration of mechanical ventilation, cardiopulmonary bypass, and aortic cross-clamp time.
Main Results:
- The incidence of upper gastrointestinal bleeding was 0.9% among 2,956 cardiac surgery patients.
- H. pylori infection was present in 77% of bleeding patients and 63% of controls (OR 1.9, p=0.2), showing no significant association.
- Prolonged mechanical ventilation (OR 22.1, p<0.001), longer cardiopulmonary bypass, and aortic cross-clamp times were significantly associated with upper gastrointestinal bleeding.
Conclusions:
- H. pylori infection is not associated with upper gastrointestinal bleeding in critically ill cardiac surgery patients receiving stress ulcer prophylaxis.
- Prolonged mechanical ventilation is a significant risk factor for upper gastrointestinal bleeding in this population.
- Prophylactic eradication of H. pylori is not clinically justified for these patients.
Objective:
To determine the prevalence of Helicobacter pylori (H. pylori) in critically ill patients who develop upper gastrointestinal bleeding after cardiac surgery in relation to other risk factors.
Design:
Prospective, single center, cohort study.
Setting:
Surgical intensive care unit in a university hospital.
Interventions:
None.
Measurements And Main Results:
Over a 1-yr period, all consecutive patients with upper gastrointestinal hemorrhage from the stomach or duodenum were studied for H. pylori infection by serology. Additionally, the need for mechanical ventilation over 48 hrs, the duration cardiopulmonary bypass, and the aortic cross-clamp time were analyzed. For control, 229 patients with no evidence of gastrointestinal hemorrhage after cardiac surgery were studied. All patients received stress ulcer prophylaxis with ranitidine. Operations were performed on 2,956 patients during the study period. The incidence of upper gastrointestinal bleeding was 0.9%. Twenty (77%) of the 26 patients with upper gastrointestinal bleeding and 145 (63%) patients of the control group had serologic evidence for H. pylori infection (odds ratio, 1.9; 95% confidence interval 0.7-5.0; p = .2). Patients who required prolonged mechanical ventilation had a significantly greater risk for upper gastrointestinal bleeding (odds ratio, 22.1; 95% confidence interval 8.6-56.7; p<.001). Patients with upper gastrointestinal bleeding also had a significantly longer duration of cardiopulmonary bypass and aortic cross-clamp time (p<.001)
Conclusions:
H. pylori is not associated with upper gastrointestinal bleeding in critically ill patients who receive stress ulcer prophylaxis, whereas patients who require prolonged mechanical ventilation are at high risk. A prophylactic eradication of H. pylori is not justified.