Perioperative risk factors for postoperative pneumonia after major oral cancer surgery: A retrospective analysis of 331 cases

et al. 2019

Preprint

Background: Postoperative pulmonary complications (PPCs) are common and significant problems for oral and maxillofacial surgery patients. Dexmedetomidine (DEX), an α2-adrenoreceptor agonist, has been proven having lung protection effects. However, since now, there has not been final conclusion about whether DEX can reduce the incidence of PPCs. We hypothesize that, in oral and maxillofacial surgery with fibular free flap reconstruction patients, DEX may decrease the incidence of PPCs.Methods: This was a prospective, double-blind, randomized, placebo-controlled, single-centered trial with two parallel arms. A total of 160 patients at intermediate-to-high risk of PPCs undergoing oral and maxillofacial surgery with fibular free flap reconstruction and tracheotomy were enrolled and randomized to receive continuous infusion of either DEX or placebo (normal saline). 0.4ug/kg dose of DEX was given over 10mins as an initial dose followed by a maintaining dose of 0.4ug/kg/h till the second day morning after surgery. At the same time, the normal saline was administered a similar quantity. The primary outcome was the incidence of PPCs according to Clavien-Dindo score within 7 days after surgery.Results: The two groups had similar characteristics at baseline. 18(22.5%) of 80 patients administered DEX, and 32(40.0%) of 80 patient administered placebo experienced PPCs within the first 7 days after surgery (relative ratio [RR] 0.563,95% confidence interval [CI] 0.346-0.916; P=0.017). In the first 7 days after surgery, the DEX group had a lower incidence of PPCs and a better postoperative survival probability (Log-rank test, P=0.019), and was less prone to occur PPCs (Cox regression, P=0.025, HR=0.516). When the total dose of DEX was more than 328μg, the patients were unlikely to have PPCs (ROC curve, AUC=0.614, P=0.009).Conclusions: Continuous infusion of DEX marks a huge decrease in the appearance of PPCs within the first 7days after surgery, for patients undergoing oral and maxillofacial surgery with fibular free flap reconstruction and tracheotomy.Trial registration: Chinese Clinical Trial Registry, www.chictr.org.cn, number: ChiCTR1800016153; Registered on May 15, 2018.

Section: Discussionsupporting

confidence: 92%

Dexmedetomidine for prevention of postoperative pulmonary complications in patients after oral and maxillofacial surgery with fibular free flap reconstruction: a prospective, double-blind, randomized, placebo-controlled trial

Liu

Zhu²,

et al. 2019

Preprint

“…3,28 Most of our patients were male (70.7% vs. 69.6%, respectively), of advanced age (mean age: 59 years vs 61 years), required a prolonged operation (340 min vs 327 min), and underwent tracheotomy (53.5% vs 56.9%), which could have been responsible for the high incidence of POP. 30,31 In addition, the time between surgery and the appearance of the first PPCs was 3 (2 to 4) days, which was in agreement with the results of previous large retrospective studies. 32 Our results showed a significant difference in intraoperative opioid consumption between the two groups, and it could be argued that the lower opioid consumption in the sevoflurane group is caused by the analgesic effect of sevoflurane, 33,34 and intraoperative opioid savings are thought to play a role in lower rates of PPCs development.…”

Section: Discussionsupporting

confidence: 90%

Comparison of the effects of intravenous and inhalational anesthesia on postoperative pulmonary complications after oral and maxillofacial surgery with free flap reconstruction: a double-blind, randomized, controlled trial

Zhu²,

Wang

et al. 2019

Preprint

Background: The effects of intravenous and inhalation anesthesia on intraoperative and postoperative pulmonary inflammatory responses have been reported in many studies. The differences in clinical postoperative pulmonary complications (PPCs) have been also studied in cardiac and lung resection surgery. However, there are few relevant reports and the findings remain controversial. Clinical evidence for the effects of these two anesthetics on PPCs in other types of surgery is still missing. The main goal of the current study was to assess the impact of sevoflurane and propofol on the incidence of PPCs in patients undergoing oral and maxillofacial surgery. Methods: In this double-blind, randomized, controlled trial, we randomly assigned 220 adults at intermediate-to-high risk of pulmonary complications after oral and maxillofacial cancer surgery with radial forearm or fibular flap reconstruction to either propofol or sevoflurane as a general anesthetic. The occurrence of pulmonary complications according to the Clavien-Dindo score was defined as the primary (within 7 days after surgery) outcome. Results: The two intervention groups had similar characteristics at baseline. The PPCs incidence during 7 days after surgery was 32.4% and 18.2% in the propofol and sevoflurane groups, respectively (adjusted relative risk, 0.44; 95% confidence interval [CI], 0.22 to 0.91; P = 0.027). The corresponding incidence of PPCs in patients who underwent tracheotomy at the end of surgery in the two groups was 44.8% and 24.5% (adjusted relative risk, 0.39; 95% CI, 0.17 to 0.91; P = 0.030). In addition, the Clavien-Dindo classification showed significant differences between groups in minor complications (grade I and II) but not in major complications (grade III to V). Intergroup difference in the time to occurrence of the first PPC after surgery was significant (P = 0.021). There was no difference in postoperative hospital stay between the two groups. Conclusions: Compared with intravenous anesthesia, the administration of sevoflurane reduces the incidence of minor PPCs (grade I to II) in moderate- and high-risk patients who have undergone tracheotomy after oral and maxillofacial cancer surgery with radial forearm or fibular flap reconstruction.

“…In addition, our survey revealed the most common PPCs was respiratory infection, registering 14(17.5%) patient in DEX group in comparison with 19 (23.8%) in placebo group. Occurrence of postoperative respiratory infection was the same with the retrospective study in 2015 about 482 patients undergoing oral cancer surgery with tracheotomy 6 and the retrospective analysis of 331 cases after oral and maxillofacial surgery with or without free flap construction in 2017 22 . Previous studies had showed that multiple variables including advanced age, male sex, poor underlying medical condition, surgery location, a higher American Society of Anesthesiologists (ASA) grade, tracheotomy and reintubation were associated with an increased risk of postoperative pneumonia 22 .…”

Section: Discussionmentioning

confidence: 60%

“…Occurrence of postoperative respiratory infection was the same with the retrospective study in 2015 about 482 patients undergoing oral cancer surgery with tracheotomy 6 and the retrospective analysis of 331 cases after oral and maxillofacial surgery with or without free flap construction in 2017 22 . Previous studies had showed that multiple variables including advanced age, male sex, poor underlying medical condition, surgery location, a higher American Society of Anesthesiologists (ASA) grade, tracheotomy and reintubation were associated with an increased risk of postoperative pneumonia 22 . All our patients were older than 51 years and underwent tracheotomy, and most of our patients were male (63.8% vs. 36.3%, 66.3% vs. 33.8%, respectively), which could have been responsible for the high incidence of postoperative pneumonia in our study.…”

Section: Discussionmentioning

confidence: 60%

Dexmedetomidine for prevention of postoperative pulmonary complications in patients after oral and maxillofacial surgery with fibular free flap reconstruction:a prospective, double-blind, randomized, placebo-controlled trial

Liu

Zhu²,

et al. 2020

Preprint

Background: Postoperative pulmonary complications (PPCs) are common and significant problems for oral and maxillofacial surgery patients. Dexmedetomidine (DEX), an α2-adrenoreceptor agonist, has been proven having lung protection effects. However, since now, there has not been final conclusion about whether DEX can reduce the incidence of PPCs. We hypothesize that, in oral and maxillofacial surgery with fibular free flap reconstruction patients, DEX may decrease the incidence of PPCs.Methods: This was a prospective, double-blind, randomized, placebo-controlled, single-centered trial with two parallel arms. A total of 160 patients at intermediate-to-high risk of PPCs undergoing oral and maxillofacial surgery with fibular free flap reconstruction and tracheotomy were enrolled and randomized to receive continuous infusion of either DEX or placebo (normal saline). 0.4 ug/kg of DEX was given over 10mins as an initial dose followed by a maintaining dose of 0.4 ug/kg/h till the second day morning after surgery. At the same time, the normal saline was administered a similar quantity. The primary outcome was the incidence of PPCs according to Clavien-Dindo score within 7 days after surgery. Results: The two groups had similar characteristics at baseline. 18(22.5%) of 80 patients administered DEX, and 32(40.0%) of 80 patient administered placebo experienced PPCs within the first 7 days after surgery (relative risk [RR] 0.563,95% confidence interval [CI] 0.346-0.916; P=0.017). In the first 7 days after surgery, the DEX group had a lower incidence of PPCs and a better postoperative survival probability (Log-rank test, P=0.019), and was less prone to occur PPCs (Cox regression, P=0.025, HR=0.516). When the total dose of DEX was more than 328μg, the patients were unlikely to have PPCs (ROC curve, AUC=0.614, P=0.009).Conclusions: For patients undergoing oral and maxillofacial surgery with fibular free flap reconstruction and tracheotomy who were at intermediate or high risk of developing PPCs, continuous infusion of DEX could decrease the occurrence of PPCs during the first 7 days after surgery and shorten the length of hospital stay after surgery, but did not increase the prevalence of bradycardia or hypotension. Trial registration: Chinese Clinical Trial Registry, www.chictr.org.cn, number: ChiCTR1800016153; Registered on May 15, 2018.