The vestibular system is a sensory motor system concerned with the sensation of linear or angular acceleration, eliciting several vestibular postural reflexes. This study was designed to figure out the functional relationship in vestibulocollic reflex. The electromyographic responses of the cervical muscles were observed during stimulation of the horizontal semicircular canal nerves. The sternomastoid muscle was inhibited by stimulation of the ipsilateral horizontal canal nerve and excited by stimulation of the contralateral horizontal canal nerve. The splenius capitis muscle was inhibited by stimulation of the ipsilateral horizontal canal nerve and excited by stimulation of the contralateral canal nerve. The semispinalis capitis revealed same pattern responses as splenius capitis or sternomastoid muscles to stimulation of the horizontal canal nerve. These experimental results indicate that the cervical extensor or flexor muscles respond in a uniform fashion to the stimulated horizontal canal nerve. And taken these results and other morphological study results together, the excitatory neural pathways from the vestibular nucleus in brain stem to cervical motoneurons are crossed to the opposite side but the inhibitory pathways from the nucleus to the cervical motoneurons are uncrossed.
Acceleration ; Animals ; Brain Stem ; Cats* ; Muscles ; Neck Muscles* ; Neck* ; Neural Pathways ; Paraspinal Muscles ; Reflex ; Semicircular Canals* ; Sensation

No abstract available.
Compensation and Redress*

No abstract available.
Animals ; Cats* ; Submandibular Gland*

PURPOSE: The purpose of this study is to analyze the CT features of the cystic masses in the neck and to review differential diagnosis. MATERIALS AND METHODS: We retrospectively reviewed and analyzed the CT findings of 22 histopathologically proved, cystic neck masses in regard to the location in fascial plane and relationship with adjacent organ. RESULTS: Of 22 cases, ten congenital cysts two ranulas, seven inflammatory lesions, and three solid tumors were includded. Ten congenital cystic masses were located in typical locations as branchial cleft cyst(5) in mandibular angle, thyroglossal duct cyst(3) in visceral space embeded within the strap muscles, cystic hygroma(1) and cavernous hemangioma(1) in posterior cervical space with insinuating appearance. Two cases of ranula included one simple ranula localized in sublingual space and a plunging ranula extending to adjacent submandibular space. Seven cases of inflammatory lesions were characterized by multispatial locations and good contrast-enhancement of walls and adjacent tissue. Solid masses of low density mimicking cyst were two pleomorphic adenomas of submandibular gland and one neurilemmoma. CONCLUSION: It is considered that thorough analysis of the CT findings with attention to typical location, CT appearance, and the relationship with the adjacent structures usually leads to the correct diagnosis.
Adenoma, Pleomorphic ; Branchial Region ; Diagnosis ; Diagnosis, Differential* ; Muscles ; Neck* ; Neurilemmoma ; Ranula ; Retrospective Studies ; Submandibular Gland

The incidence of conjoined twins is so rare that few anesthesiologists have an opportunity of managing them. Especially in Korea, there are only a few reports describing the anesthetic management for surgical separation of newborn conjoined twins. We experienced the successful anesthetic management for surgical separation of thoraco-xiphopagus conjoined twins without any particular problems. After applying the noninvasive monitors (ECG, pulse oximeter), one of the twins (twinA) with congenital heart disease was administered with intravenous ketamine for induction of anesthesia and intubated without neuromuscular blocker. Anesthesia was maintained with N2O-O2 and hand ventilation using Mapleson D breathing circuit. After maintaining airway of the twinA, the twinB was intubated and maintained with the same manner. Eighteen days after the separation procedure, the twinA with congenital heart disease died and the other one, twinB has been alive with normal growth and development.
Anesthesia ; Growth and Development ; Hand ; Heart Defects, Congenital ; Humans ; Incidence ; Infant, Newborn ; Ketamine ; Korea ; Neuromuscular Blockade ; Respiration ; Twins, Conjoined* ; Ventilation

Arterial cannulation for constant monitoring of arterial pressure and blood gase analyses has become commonplace in the care of the critically ill patients. The radial artery is often regarded as causing a negligible complication risk because of extensive collateral arterial flow in the hand. One of other alternative sites for arterial cannulation is femoral artery. Femoral artery cannulation has a high degree of success in very small, critically ill children. It should be considered an acceptable alternative to small-vessel cannulation when the latter is not technically achievable, or in the unstable patient where rapid establishment of reliable artery access is necessary. Arterial cannulation may cause many complications: arterial catheters can directly injure the vessels, resulting in thrombosis, occlusion, distal embolization or ischemia. Local insertion site complications, such as hematoma, hemorrhage, and infection may occur. Arterial catheter may also be a source of systemic sepsis. We report an unusual case of unintentional release of a catheter fragment into the external iliac artery in a 7-month (7.8 kg) male patient with tetralogy of Fallot, which was inadvertently inserted during right femoral artery cannulation. The catheter fragment was successfully retrieved with the Amplatz Goose Neck microsnare under fluoroscopy without any problems.
Arterial Pressure ; Arteries ; Catheterization* ; Catheters* ; Child ; Critical Illness ; Femoral Artery* ; Fluoroscopy ; Hand ; Hematoma ; Hemorrhage ; Humans ; Iliac Artery* ; Ischemia ; Male ; Neck ; Radial Artery ; Sepsis ; Tetralogy of Fallot ; Thrombosis

No abstract available.
Paralyses, Familial Periodic*

No abstract available.
Cell Cycle*

No abstract available.
Hemangioma, Cavernous*

PURPOSE: To investigate the efficacy of age, International Prostate Symptom Score(I-PSS), quality of life(QOL) score, various parameters obtained by transrectal ultrasonography(TRUS) as predictors of the onset of acute urinary retention in patients with benign prostatic hyperplasia(BPH). MATERIALS AND METHODS: From January 1996 to December 1997, 101 men(mean age 70years, range 52-92) with symptoms of BPH were enrolled in this study. Among them, 36 patients had suffered from acute urinary retention. TRUS was used to calculate the total prostate(TP) volume, the transitional zone(TZ) volume, the transitional zone index(TZ index=TZ volume/TP volume). To compare the usefulness of various indices, the area under the receiver-operator characteristic(ROC) curve was calculated for each index. RESULTS: There were significant differences in age, TP volume, TZ volume, TZ index between patients with and without acute urinary retention, but no significant differences in I-PSS and QOL score. In patients with acute urinary retention, the area under the ROC curve was 0.911 for the TZ index, 0.892 for the TZ volume, 0.769 for the TP volume and 0.660 for the age. CONCLUSIONS: The TZ index is a useful predictor of acute urinary retention in patients with BPH and may be a useful parameter for decision of surgical intervention.
Humans ; Prostate ; Prostatic Hyperplasia* ; ROC Curve ; Urinary Retention*