Although tubuloglomerular feedback (TGF) is involved in ureteral obstruction-induced increase in renal blood flow (RBF), its contribution to RBF is not well established due to the concommitant increases in prostaglandin (PG) and renal interstitial fluid pressure (Pisf), both of which affect RBF one way or the other. Since Pisf and TGF are closely affected by renal hemodynamics, RBF will respond differently to increases in ureteral pressure depending on renal hemodynamic conditions. Therefore, the purpose of the present study was to investigate how the changes in renal hemodynamics affect the response of RBF to increases in ureteral pressure. The effect of PG on RBF was assessed by comparing the effects obtained before and after indomethacin, a cyclooxygenase inhibitor. Six anesthetized dogs were prepared with flow probes and inflatable silastic occluder around the renal artery, the ureteral catheter with its free end attached to a water reservoir, and the arterial and venous catheters. RBFs were obtained at ureteral pressures of 0, 15, and 40cmH2O during the maintenance of the renal artery pressure (RAP) at the level of systemic arterial pressure, 10mmHg above and below the lower autoregulatory limit of RBF (65+/-4 mmHg) both before and after indomethacin administration (10mg/kg). In response to the ureteral pressure of 40cmH2O, RBF increased from 172+/-6 to 185+/-10ml/min when RAP's were equal to systemic arterial pressure and decreased from 162+/-10 to 120+/-9 ml/min when RAP's were 55+/-4mmHg. Indomethacin pretreatment, depending on the level of RAP either prevented an increase or augmented a decrease in RBF in response to ureteral pressure elevation. This suggests that RAP-dependent changes in susceptibility of the renal venous system to compression by increased Pisf is the main mechanism by which the changes in renal perfusion pressure modulate the response of RBF to ureteral pressure elevation.
Animals ; Arterial Pressure ; Catheters ; Dogs* ; Extracellular Fluid ; Hemodynamics ; Indomethacin ; Perfusion ; Prostaglandin-Endoperoxide Synthases ; Renal Artery ; Renal Circulation* ; Ureter* ; Ureteral Obstruction* ; Urinary Catheters ; Water

No abstract available.
Animals ; Olfactory Bulb* ; Olfactory Mucosa* ; Rats* ; Synapses*

No abstract available.
Humans ; Siblings*

No abstract available.
Apocrine Glands ; Hidrocystoma*

No abstract available.
Polyps*

BACKGROUND: To provide some fundamental physiological basis for the physical training of pilots to improve orthostatic intolerance, cardiorespiratory responses to the symptom-limited maximal exercise loading were studied in pilots and non-pilots, and the results were compared. METHOD: Cardiorespiratory reponses to the symptom-limited maximal exercise loading by Bruce protocol was studied in 11 pilots and 11 matched controls (non-pilots). RESULTS: Comparisons of various data at maximal exercise in the pilots with those in the controls revealed that RR, VE/M2, VE/VO2, VE/VCO2, VT/VC and VE/MVV as well as HR, VO2, O2 pulse and AT showed no significant difference. CONCLUSION: The fact that the aerobic power in the pilots is not superior to that in the controls seems to emphasisze the necessity of aerobic endurance training along with muscular strength training to improve orthostatic tolerance of pilots flying modern high-performance aircrafts.
Aircraft ; Diptera ; Orthostatic Intolerance ; Resistance Training

BACKGROUND: It is well known that when macrophages are stimulated with endotoxin, they produce a wide variety of cytokine mediators, including TNF-α and IL-1β. However, there is an alterationnin the macrophages responsiveness when they are challenged with repeated bouts of endotoxin, termed 'endotoxin tolerance' which is regarded as a self-protective phenomenon from continuous stimulation. In this study, endotoxin tolerance in the peripheral blood monocytes of sepsis patients was evaluated. METHODS: Fourteen patients with organism-documented sepsis were included. The severity of illness was evaluated by APACHE IIscore. Peripheral blood monocytes were isolated from the patients and diluted to 1×105/well. After stimulation with endotoxin(LPS of E. coli O114:B4, 100 ng/ml), they were incubated at 37℃ in 5% CO2 incubator for 24 hours. Supernatant was collected for the measurement of TNF-αand IL-1β with ELISA method. Peripheral blood monocytes of seven healthy volunteers were used as control. RESULTS: The APACHE IIscore(mean±SD) of the patients at the time of blood sampling was 12.2±5.7. The primary infection foci were urinary tract infection, pneumonia, subacute bacterial endocarditis, and catheter related infection, etc. The causative organisms were gram negative rods(10 cases), gram positive cocci(6 cases) with two cases of mixed infection. Serum TNF-α could be measured in 4 cases with 29.9±27.7 pg/ml. Serum IL-1β was measureable in only one patient. The TNF-α level of supernatant of cultured peripheral blood monocytes was 2,703±2,066 pg/ml in patients and 2,102±1,914 pg/ml in controls. The IL-1β level of supernatant was 884±1,050 pg/ml in patients and 575±558 pg/ml in controls. There was no difference of TNF-α and IL-1β level between patients and controls. CONCLUSION: We cannot prove the phenomenon of endotoxin tolerance in this study. Future study needs to be focused on the more severe sepsis patients who were taken for sampling earlier. Addition of serum to the culture medium could be an another valuable option for the success of this study.
APACHE ; Catheters ; Coinfection ; Endocarditis, Subacute Bacterial ; Enzyme-Linked Immunosorbent Assay ; Healthy Volunteers ; Humans ; Incubators ; Macrophages ; Monocytes ; Pneumonia ; Sepsis* ; Tumor Necrosis Factor-alpha* ; Urinary Tract Infections

No abstract available.
Humans ; Twins*

BACKGROUND: To describe the fast experience of case-leased advanced cardiac life support(ACLC) course in Korea. METHODS: We have given case-based ACLC course to 13 nurses(6 emergency nurses, 4 coronary care unit muses, 3 professors) and 17 physicians(4 emergency physicians, 12 emergency residents, 1 intem). We performed the case-based ACLS course according to 1992 American Heart Association guidelines and recommendations for advanced cardiac life support by american ACLS instructors(1 pulmonologist, 4 critical care nurses). We performed final theoretical written test and 2 times written survey (immediate and 100th day after the course) about the course. RESULTS: On final written test, all practitioners answered at leasts 70% of the questions correctly. There was no significant difference between nurses and physicians(86.2+/-3.6 of physicians and 82.5+/-6.8 of nurses, p=0.06). 90%of participants considered that case-based advanced cardiac life support was acceptable. 100th day after the course, 93%of participants answered that ACLS course have been helpful on his/her job and also want retraining of ACLS course. 70%of participants considered that ideal ACLS training committee in Korea is the Korean Society of Emergency Medicine. CONCLUSION: Case-based ACLS course is a useful educational method far physicians and nurses in Korea. In the future, we should organize Korean resuscitation committee and then make guidelines for ACLS, and then continuously educate physicians and nurses.
Adult* ; Advanced Cardiac Life Support ; Alprostadil ; American Heart Association ; Coronary Care Units ; Critical Care ; Emergencies ; Emergency Medicine ; Humans ; Korea* ; Resuscitation

No abstract available.
Dermatomyositis* ; Stomach Neoplasms*