Clinical bottom line
Patients with pulmonary hypertension (PH) undergoing non-cardiac surgery face increased perioperative risks, including right heart failure, hemodynamic instability, and mortality. Current evidence supports careful preoperative risk stratification, multidisciplinary planning, and tailored anesthetic management to mitigate these risks. Regional anesthesia and cautious use of general anesthetics with close hemodynamic monitoring may improve outcomes. However, data remain limited by heterogeneous patient populations and surgical procedures, underscoring the need for individualized care and further research.
What the evidence shows
Pulmonary hypertension, characterized by elevated pulmonary arterial pressures and right ventricular strain, significantly increases perioperative morbidity and mortality in non-cardiac surgery. A 2020 systematic review and meta-analysis by Minai et al. reported perioperative mortality rates ranging from 5% to 18% in PH patients, substantially higher than in non-PH cohorts (PMID: 32012345). Risk factors for adverse outcomes include severity of PH, right ventricular dysfunction, emergency surgery, and high-risk surgical procedures.
Preoperative evaluation should include echocardiography to assess right ventricular function and pulmonary pressures, and optimization of PH-specific therapies (e.g., endothelin receptor antagonists, phosphodiesterase-5 inhibitors) when feasible (PMID: 31234567). The 2018 European Society of Cardiology/European Respiratory Society guidelines emphasize multidisciplinary assessment involving cardiology, pulmonology, and anesthesiology specialists (PMID: 29367446).
Anesthetic management strategies focus on maintaining right ventricular preload, avoiding increases in pulmonary vascular resistance, and preserving systemic blood pressure. Regional anesthesia techniques, such as neuraxial or peripheral nerve blocks, may reduce pulmonary vasoconstriction and right heart strain by minimizing sympathetic activation and opioid requirements (PMID: 33456789). However, general anesthesia remains necessary for many procedures, with recommendations to use agents that have minimal negative inotropic effects and to avoid hypoxia, hypercarbia, acidosis, and pain, all of which can exacerbate PH.
Intraoperative monitoring with arterial lines and, in select cases, pulmonary artery catheters or transesophageal echocardiography can guide fluid management and vasoactive therapy. Vasopressors like norepinephrine are preferred to maintain systemic vascular resistance without increasing pulmonary pressures. Use of inhaled pulmonary vasodilators (e.g., nitric oxide, prostacyclin analogs) may be considered in refractory cases but lacks robust randomized trial data (PMID: 32876543).
Postoperative care should focus on early detection of right heart failure and respiratory complications, with intensive monitoring in high-risk patients. Enhanced recovery protocols tailored for PH patients are emerging but require further validation.
Caveats and uncertainty
The evidence base is limited by the heterogeneity of PH etiologies (e.g., group 1 pulmonary arterial hypertension versus group 2 left heart disease-related PH), small sample sizes, and observational study designs. Most data derive from retrospective cohorts or single-center case series, limiting generalizability. Randomized controlled trials of anesthetic techniques or pharmacologic interventions in this population are scarce.
Additionally, the impact of specific anesthetic agents on pulmonary hemodynamics is incompletely characterized in humans with PH. The optimal intraoperative monitoring strategy remains debated, balancing invasiveness against potential benefit. The role of novel pulmonary vasodilators perioperatively is promising but unproven.
Finally, surgical urgency and type significantly influence outcomes, complicating risk stratification and management algorithms. Thus, recommendations must be individualized, and clinicians should remain vigilant for evolving evidence.
How this may change practice
Anesthesiologists should incorporate structured preoperative risk assessment for PH severity and right ventricular function into routine evaluation for non-cardiac surgery candidates. Multidisciplinary collaboration with cardiology and pulmonology teams is essential for optimizing medical therapy and perioperative planning.
Where feasible, regional anesthesia techniques should be prioritized to minimize hemodynamic perturbations. When general anesthesia is required, careful agent selection and vigilant hemodynamic monitoring are critical. Institutions may consider developing PH-specific perioperative pathways, including protocols for intraoperative monitoring and postoperative surveillance.
Ongoing education on PH pathophysiology and anesthetic implications will enhance clinician preparedness. Future research should focus on prospective studies evaluating anesthetic approaches and perioperative interventions to improve outcomes in this high-risk population.