Purpose: Lecture-based teaching is widely used in preclinical medical education, offering a systematic way to deliver complex information efficiently. However, its effectiveness heavily relies on the instructional behaviors of lecturers. Despite its importance, limited research has explored the specific differences between effective and ineffective teaching behaviors perceived by students. This study aims to analyze these behaviors systematically to provide actionable insights for enhancing teaching competencies. Methods: This study surveyed 92 first-year medical students to evaluate effective and ineffective teaching behaviors. A 30-item questionnaire was developed based on existing literature. Data analysis included descriptive statistics to rank teaching behaviors and chi-square tests to examine their correlations. Results: Effective behaviors included appropriate voice volume, clear pronunciation, error-free lecture materials, clear explanations of learning objectives, and humor. Ineffective behaviors were poor voice clarity, insufficient summarization, lack of follow-up session introductions, absence of online resources, and poor interaction. Significant relationships between effective and ineffective behaviors were observed in some items. Conclusion The study highlights those effective behaviors, such as recalling prior learning, utilizing materials, and engaging students, enhance learning outcomes. Faculty development should focus on avoiding ineffective behaviors for novice faculty and reinforcing effective ones for mid-career faculty to improve teaching quality in medical education.

Purpose: Lecture-based teaching is widely used in preclinical medical education, offering a systematic way to deliver complex information efficiently. However, its effectiveness heavily relies on the instructional behaviors of lecturers. Despite its importance, limited research has explored the specific differences between effective and ineffective teaching behaviors perceived by students. This study aims to analyze these behaviors systematically to provide actionable insights for enhancing teaching competencies. Methods: This study surveyed 92 first-year medical students to evaluate effective and ineffective teaching behaviors. A 30-item questionnaire was developed based on existing literature. Data analysis included descriptive statistics to rank teaching behaviors and chi-square tests to examine their correlations. Results: Effective behaviors included appropriate voice volume, clear pronunciation, error-free lecture materials, clear explanations of learning objectives, and humor. Ineffective behaviors were poor voice clarity, insufficient summarization, lack of follow-up session introductions, absence of online resources, and poor interaction. Significant relationships between effective and ineffective behaviors were observed in some items. Conclusion The study highlights those effective behaviors, such as recalling prior learning, utilizing materials, and engaging students, enhance learning outcomes. Faculty development should focus on avoiding ineffective behaviors for novice faculty and reinforcing effective ones for mid-career faculty to improve teaching quality in medical education.

Purpose: Lecture-based teaching is widely used in preclinical medical education, offering a systematic way to deliver complex information efficiently. However, its effectiveness heavily relies on the instructional behaviors of lecturers. Despite its importance, limited research has explored the specific differences between effective and ineffective teaching behaviors perceived by students. This study aims to analyze these behaviors systematically to provide actionable insights for enhancing teaching competencies. Methods: This study surveyed 92 first-year medical students to evaluate effective and ineffective teaching behaviors. A 30-item questionnaire was developed based on existing literature. Data analysis included descriptive statistics to rank teaching behaviors and chi-square tests to examine their correlations. Results: Effective behaviors included appropriate voice volume, clear pronunciation, error-free lecture materials, clear explanations of learning objectives, and humor. Ineffective behaviors were poor voice clarity, insufficient summarization, lack of follow-up session introductions, absence of online resources, and poor interaction. Significant relationships between effective and ineffective behaviors were observed in some items. Conclusion The study highlights those effective behaviors, such as recalling prior learning, utilizing materials, and engaging students, enhance learning outcomes. Faculty development should focus on avoiding ineffective behaviors for novice faculty and reinforcing effective ones for mid-career faculty to improve teaching quality in medical education.

Purpose: Lecture-based teaching is widely used in preclinical medical education, offering a systematic way to deliver complex information efficiently. However, its effectiveness heavily relies on the instructional behaviors of lecturers. Despite its importance, limited research has explored the specific differences between effective and ineffective teaching behaviors perceived by students. This study aims to analyze these behaviors systematically to provide actionable insights for enhancing teaching competencies. Methods: This study surveyed 92 first-year medical students to evaluate effective and ineffective teaching behaviors. A 30-item questionnaire was developed based on existing literature. Data analysis included descriptive statistics to rank teaching behaviors and chi-square tests to examine their correlations. Results: Effective behaviors included appropriate voice volume, clear pronunciation, error-free lecture materials, clear explanations of learning objectives, and humor. Ineffective behaviors were poor voice clarity, insufficient summarization, lack of follow-up session introductions, absence of online resources, and poor interaction. Significant relationships between effective and ineffective behaviors were observed in some items. Conclusion The study highlights those effective behaviors, such as recalling prior learning, utilizing materials, and engaging students, enhance learning outcomes. Faculty development should focus on avoiding ineffective behaviors for novice faculty and reinforcing effective ones for mid-career faculty to improve teaching quality in medical education.

Purpose: To investigate the prevalence of lower urinary tract symptoms/benign prostatic hyperplasia in a Korean population. Materials and Methods: The Korean Prostate & Voiding Health Association provided free prostate-related community health care and conducted surveys in all regions of Korea from 2001 to 2022 with the cooperation of local government public health centers. A total of 72,068 males older than 50 were surveyed and analyzed. History taking, International Prostate Symptom Score (IPSS), transrectal ultrasonography, prostate-specific antigen (PSA) testing, uroflowmetry, and urine volume testing were performed. Results: The mean prostate volumes in males in their 50s, 60s, 70s, and 80s or above were 24.7 g, 27.7 g, 31 g, and 33.7 g, respectively. The proportion of males with high PSA greater than 3 ng/mL was 3.8% among males in their 50s, 7.7% among males in their 60s, 13.1% among males in their 70s, and 17.9% among males 80 years of age or older. The mean IPSS total scores in males in their 50s, 60s, 70s, and 80s or above were 10.7, 12.7, 14.5, and 16, respectively. Severe symptoms were reported by 27.3% of males, whereas 51.7% reported moderate symptoms. The mean Qmax in males in their 50s, 60s, 70s, and 80s or above were 20 mL/s, 17.4 mL/s, 15.4 mL/s, and 13.8 mL/s, respectively. Conclusions In this population-based study, mean prostate volume, IPSS, PSA, and Qmax were 30.6±15.1 g, 14.8±8.2, 1.9±4.7 ng/mL, and 15.6±6.5 mL/s, respectively. Aging was significantly associated with increased prostate volume, PSA levels, and IPSS scores, and with decreased Qmax and urine volume.

Lateral spinal artery (LSA) aneurysms are extremely rare lesions that can rupture and cause subarachnoid hemorrhage (SAH) even though the spinal arteries communicate directly with the subarachnoid space. To date, six cases of LSA aneurysms have been reported in the literature. Herein, three such cases are reported. All patients presented to the emergency department with headaches. The patients in the first two cases were confirmed to have SAH and LSA aneurysms on a brain computed tomography (CT) angiography performed at the hospital. Two patients had prior instances of cerebral infarction and coronary disease, respectively, and were undergoing antiplatelet therapy. The antiplatelet medication was stopped for 2 weeks and 1 week, respectively, while conservative care was provided. Subsequently, a suboccipital craniectomy was performed, followed by aneurysm clipping. Following the surgery, both patients were discharged without any significant neurological deficits. Regarding the third patient, no aneurysm was found on brain CT angiography, and cerebral angiography was performed during the patient’s hospital stay. She was hospitalized, where she received medication and conservative care, and was discharged with an improvement in bleeding without neurological symptoms. Subsequently, a LSA aneurysm was identified on a brain CT angiography performed at an outpatient clinic; however, the patient was transferred because she wanted to be treated at another hospital. LSA aneurysms are difficult to visualize using CT angiography; therefore, careful angiographic studies are required. Surgical clipping is the treatment of choice if the aneurysm is inaccessible by the endovascular treatment.

Objective: Tracheostomy is a necessary procedure for patients admitted to the neurosurgery intensive care unit (ICU) with severe brain injury, because mechanical ventilation must be maintained for a long time following neurologic failure. The purpose of this study was to compare conventional surgical tracheostomy (CST) and percutaneous dilatational tracheostomy (PDT) performed at the bedside in critically ill neurosurgery patients requiring tracheostomy to determine which procedure has comparative advantages. Methods: This retprospective study was conducted between January 2019 and December 2020. PDT was performed on 52 patients and CST was performed on 44 patients. The baseline characteristics, procedural characteristics, and clinical outcomes were recorded. Results: The mean operative time in the CST group was 25.5±6.5 minutes and that in the PDT group was 15.1±2.5 minutes; the difference was statistically significant (p<0.01). Four patients in the CST group and none in the PDT group experienced bleeding requiring transfusion. However, there was no significant difference in total ICU mortality or length of hospital stay. There were no statistical differences in the individual complication categories between the 2 study groups. Conclusion There were fewer procedure-induced complications among patients receiving PDT than among those receiving CST. In addition, the treatment time for PDT was shorter than that for CST treatment.

Background: This study aims to investigate the frequency of distal femoral and popliteal arterial calcification and to evaluate the intraoperative and postoperative effects of arterial calcification in patients undergoing total knee arthroplasty using a tourniquet. Methods: The records of 5,438 patients who had undergone primary total knee arthroplasty between January 2003 and January 2017 were retrospectively reviewed. We examined the preoperative radiographs of the knee from all patients for calcifications of the femoral and popliteal arteries. Vascular calcification was identified on preoperative radiographs in 223 cases. Intraoperative and postoperative complications were investigated among these patients. Postoperative complications were analyzed from the time of surgery to the last follow-up (minimum 1-year follow-up). Results: Vascular calcification of the arteries around the knee was found in 223 cases (4.1%). The mean patient age was 70.6 years in the non-calcification group and 73.8 years in the calcification group (p > 0.05). The calcification group was classified into medial, intimal, or mixed subgroups according to the morphology of calcification on preoperative radiographs. The medial type included 46 cases (20.6%); intimal type, 161 cases (72.2%); and mixed type, 16 cases (2.7%). There was no statistically significant difference in demographic and surgical data among the three groups. There were intraoperative complications in two cases in the medial type group, both of which involved tourniquet failure. There was also a postoperative complication in one case in the medial type group, which involved wound dehiscence at 2 weeks postoperatively. No other postoperative complications were identified during 1-year follow-up. Conclusions Despite the presence of calcifications in the arteries around the knee, total knee arthroplasty (using a tourniquet) can be performed without serious complications.

Vertebral artery injuries associated with C1 lateral mass screw insertion rarely occur during C1-2 fusion. The posterior inferior cerebellar artery (PICA) is uncommonly located at the C1 lateral mass insertion position. A 71-year-old woman with atlanto-axial subluxation and cord compression underwent C1-2 fusion. Sixth nerve palsy and diplopia were detected postoperatively, and decreased consciousness occurred on postoperative day 4. Brain magnetic resonance image (MRI) and computed tomography (CT) revealed PICA infarction. In the preoperative CT angiography, the PICA originated between the C1 and C2 level. In the postoperative CT scan, the PICA was not visible. The patient was treated conservatively for two weeks and recovered. PICA originating between the C1 and C2 level comprises 1.1–1.3% of cases. Therefore, vertebral artery anomalies should be evaluated prior to C1-2 fusion to prevent vessel injuries.
Abducens Nerve Diseases ; Aged ; Angiography ; Arteries ; Brain ; Brain Infarction ; Consciousness ; Diplopia ; Female ; Humans ; Infarction ; Pica ; Tomography, X-Ray Computed ; Vertebral Artery

The presence of primary intraventricular hemorrhage (IVH) without vascular lesion is very rare. We experienced solitary IVH without subarachnoid hemorrhage due to aneurysmal rupture in a 58-year-old man treated with coil embolization, which contributed to his good prognosis. After 33 days of hospitalization, he had mild right hemiplegic symptoms remaining, and he was transferred to a rehabilitation institute for further treatment. In cases of primary IVH, computed tomography angiography seems worthwhile for making a differential diagnosis, although the possibility of IVH due to cerebral aneurysmal rupture is very low. Endovascular intervention is a good option for diagnosis and treatment.
Aneurysm ; Angiography ; Cerebral Angiography ; Diagnosis ; Diagnosis, Differential ; Embolization, Therapeutic ; Endovascular Procedures ; Hemorrhage ; Hospitalization ; Humans ; Intracranial Aneurysm ; Middle Aged ; Prognosis ; Rehabilitation ; Rupture ; Subarachnoid Hemorrhage