Purpose: We examined the progression of experimental peri-implantitis in sites that underwent either alveolar ridge preservation (ARP) or spontaneous healing (SH), comparing infected teeth (IT) and non-infected teeth (NIT). This investigation is a secondary analysis of a preclinical study aimed at exploring the correlation between newly formed bone and implant stability quotient (ISQ), as well as the association between newly formed bone and the progression of experimental peri-implantitis. Methods: The bilateral mandibular third or fourth premolars of 6 beagle dogs were randomly assigned to 4 groups: IT/SH, IT/ARP, NIT/SH, and NIT/ARP. Following implant placement, core biopsies were retrieved from each site, and the ISQ value was measured. A 3-month period was allowed for peri-implantitis induction, followed by an additional 3 months for the spontaneous progression of peri-implantitis, with radiographs taken at each time point. Results: During the spontaneous progression of peri-implantitis, no statistically significant differences were observed among the groups in terms of mean ISQ values and radiographic marginal bone loss. Similarly, the percentages of bone substitute, newly formed bone, and fibrovascular connective tissue in core biopsies did not differ significantly among the groups.Linear regression analysis revealed no significant linear correlation between newly formed bone and ISQ in any group (P>0.05). However, a weak linear correlation between newly formed bone and marginal bone loss during the spontaneous progression of peri-implantitis was noted in the IT/SH group alone (P=0.036). Conclusions Within the limitations of this study, we were unable to demonstrate that ARP could improve newly formed bone or primary implant stability. Furthermore, neither ARP nor SH significantly influenced the spontaneous progression of experimental peri-implantitis.

Purpose: This study aimed to analyze the bone regeneration and biosorption patterns of different bone substitutes in a rabbit skull defect model. Methods: Four circular 8 mm-defects were created in the cranium of 12 New Zealand white rabbits, each weighing approximately 3 kg. Each defect was randomly assigned to one of 4 treatment groups: cortical deproteinized porcine bone mineral (DPBM), cancellous DPBM, biphasic calcium phosphate (BCP) with a 6:4 ratio of hydroxyapatite (HA) to β-tricalcium phosphate (β-TCP) (TCP4), and BCP with a 2:8 ratio of HA to β-TCP (TCP8). The rabbits were euthanized at either 6 weeks (n=6) or 12 weeks (n=6) post-surgery. The harvested specimens were then analyzed both radiographically and histomorphometrically. Results: In the micro-computed tomography analysis, no statistically significant differences were observed among the 4 groups, except in the bone graft volume/tissue volume (GV/TV) at 12 weeks. Cortical DBPM exhibited a higher GV/TV ratio than cancellous DBPM at the same time point. The histomorphometric analysis revealed increased biosorption in cancellous DBPM compared to cortical DBPM at 12 weeks. However, the percentage of newly formed bone did not significantly differ among the 4 groups. Conclusions All types of bone substitutes demonstrated similar patterns of bone regeneration at both 6 and 12 weeks of observation. However, cancellous DPBM exhibited a higher rate of bioabsorption compared to other bone substitutes, suggesting that it may have different indications or applications in guided bone regeneration protocols.

Remimazolam, an ultra-short-acting anesthetic with flumazenil as a reversal agent, typically facilitates patient awakening postoperatively. However, our case reveals an unusual occurrence: despite flumazenil initially restoring consciousness, re-sedation due to remimazolam ensued six hours later. Case: A 65-year-old woman underwent total intravenous general anesthesia with remimazolam and remifentanil during the 140-min surgery. Despite an initially smooth recovery, she progressively became drowsy upon transfer to the general ward, eventually reaching a stuporous state. Multiple interventions, including opioid reversal (intravenous patient-controlled analgesia discontinuation, and naloxone administration) were attempted. Neurological consultation revealed no issues; however, immediate improvement after flumazenil administration suggested remimazolam’s involvement. The patient was discharged without complications. Conclusions: This case challenges our understanding of remimazolam’s dynamics, emphasizing the necessity for vigilant post-anesthesia monitoring, even in seemingly low-risk cases. It advocates for standardized response protocols to promptly manage unforeseen events and ensure patient safety.

Remimazolam, an ultra-short-acting anesthetic with flumazenil as a reversal agent, typically facilitates patient awakening postoperatively. However, our case reveals an unusual occurrence: despite flumazenil initially restoring consciousness, re-sedation due to remimazolam ensued six hours later. Case: A 65-year-old woman underwent total intravenous general anesthesia with remimazolam and remifentanil during the 140-min surgery. Despite an initially smooth recovery, she progressively became drowsy upon transfer to the general ward, eventually reaching a stuporous state. Multiple interventions, including opioid reversal (intravenous patient-controlled analgesia discontinuation, and naloxone administration) were attempted. Neurological consultation revealed no issues; however, immediate improvement after flumazenil administration suggested remimazolam’s involvement. The patient was discharged without complications. Conclusions: This case challenges our understanding of remimazolam’s dynamics, emphasizing the necessity for vigilant post-anesthesia monitoring, even in seemingly low-risk cases. It advocates for standardized response protocols to promptly manage unforeseen events and ensure patient safety.

Remimazolam, an ultra-short-acting anesthetic with flumazenil as a reversal agent, typically facilitates patient awakening postoperatively. However, our case reveals an unusual occurrence: despite flumazenil initially restoring consciousness, re-sedation due to remimazolam ensued six hours later. Case: A 65-year-old woman underwent total intravenous general anesthesia with remimazolam and remifentanil during the 140-min surgery. Despite an initially smooth recovery, she progressively became drowsy upon transfer to the general ward, eventually reaching a stuporous state. Multiple interventions, including opioid reversal (intravenous patient-controlled analgesia discontinuation, and naloxone administration) were attempted. Neurological consultation revealed no issues; however, immediate improvement after flumazenil administration suggested remimazolam’s involvement. The patient was discharged without complications. Conclusions: This case challenges our understanding of remimazolam’s dynamics, emphasizing the necessity for vigilant post-anesthesia monitoring, even in seemingly low-risk cases. It advocates for standardized response protocols to promptly manage unforeseen events and ensure patient safety.

Remimazolam, an ultra-short-acting anesthetic with flumazenil as a reversal agent, typically facilitates patient awakening postoperatively. However, our case reveals an unusual occurrence: despite flumazenil initially restoring consciousness, re-sedation due to remimazolam ensued six hours later. Case: A 65-year-old woman underwent total intravenous general anesthesia with remimazolam and remifentanil during the 140-min surgery. Despite an initially smooth recovery, she progressively became drowsy upon transfer to the general ward, eventually reaching a stuporous state. Multiple interventions, including opioid reversal (intravenous patient-controlled analgesia discontinuation, and naloxone administration) were attempted. Neurological consultation revealed no issues; however, immediate improvement after flumazenil administration suggested remimazolam’s involvement. The patient was discharged without complications. Conclusions: This case challenges our understanding of remimazolam’s dynamics, emphasizing the necessity for vigilant post-anesthesia monitoring, even in seemingly low-risk cases. It advocates for standardized response protocols to promptly manage unforeseen events and ensure patient safety.

Remimazolam, an ultra-short-acting anesthetic with flumazenil as a reversal agent, typically facilitates patient awakening postoperatively. However, our case reveals an unusual occurrence: despite flumazenil initially restoring consciousness, re-sedation due to remimazolam ensued six hours later. Case: A 65-year-old woman underwent total intravenous general anesthesia with remimazolam and remifentanil during the 140-min surgery. Despite an initially smooth recovery, she progressively became drowsy upon transfer to the general ward, eventually reaching a stuporous state. Multiple interventions, including opioid reversal (intravenous patient-controlled analgesia discontinuation, and naloxone administration) were attempted. Neurological consultation revealed no issues; however, immediate improvement after flumazenil administration suggested remimazolam’s involvement. The patient was discharged without complications. Conclusions: This case challenges our understanding of remimazolam’s dynamics, emphasizing the necessity for vigilant post-anesthesia monitoring, even in seemingly low-risk cases. It advocates for standardized response protocols to promptly manage unforeseen events and ensure patient safety.

Background: Difficult airway occurs due to anatomical abnormalities of the airway that can be predicted through airway assessments; however, abnormalities beyond the vocal cord can be clinically asymptomatic and undetected until intubation failure to advance the endotracheal tube.Case: We present a case of an unanticipated difficult airway in a stuporous 80-year-old female with a recent history of intracerebral hemorrhage and prolonged intubation. She required emergency ventriculo-peritoneal shunt surgery due to the progression of her hydrocephalus. Under anesthesia, facemask ventilation was easy and video laryngoscopy provided a full view of the glottis; however, endotracheal tube (ETT) entry failed. We suspected stenosis beyond the vocal cord, and a smaller diameter ETT was inserted and maintained for airway management during emergency surgery. Postoperative neck computed tomography findings revealed laryngotracheal stenosis (LTS). Conclusions Anesthesiologists should be aware that LTS may be asymptomatic and consider difficult airway guidelines in patients with history of prolonged endotracheal intubation.

Internal jugular veins are the most frequently accessed site for central venous catheterization in patient management, whereas complications involving vertebral veins are a rare occurrence. Case: A 73-year-old male suspected to have a urothelial carcinoma was scheduled for elective left nephroureterectomy. During central venous catheterization using the anatomic landmark technique to target the internal jugular vein, a guidewire is inadvertently inserted into the suspected vertebral vein. Following the correction of the catheterization, a radiologist reviewed the preoperative enhanced computed tomography and confirmed that the initially punctured vessel was the vertebral vein. On the third day after surgery, the central venous catheter was removed, and the patient did not exhibit any complications, such as bleeding, swelling, and neurological symptoms. Conclusions: The use of ultrasonography during central venous catheterization is recommended to evaluate the anatomy of the puncture site and prevent misinsertion of the catheter, which can lead to several complications.

Forced-air warming is commonly utilized to prevent perioperative hypothermia. Underbody warming blankets are often employed to secure a larger area for patient warming. While forced-air warming systems are generally regarded as safe, improper usage poses a risk of cutaneous complications. Additionally, the influence of underbody blankets on cutaneous complications remains uncertain. We present a case of cutaneous complications resulting from the improper utilization of a forced-air warming device and an underbody blanket. A 79-year-old man presented to the hospital for robotic proctectomy under general anesthesia. The surgery lasted for 7 hours, and the forced-air warming device with underbody blanket operated continuously for 5 hours intraoperatively. The surgery was completed without any incidents. However, first-degree burns on the patient’s back, along with superficial decubitus ulcers on his right scapula, were observed after surgery. To prevent cutaneous complications, clinicians must adhere to the manufacturer's guidelines when utilizing a forced-air warming system. Compared to overbody blankets, underbody blankets have limitations in monitoring cutaneous responses. Ensuring patient safety requires selecting an appropriate blanket for scheduled operations.