To-and-fro veno-venous extracorporeal lung assist for newborns with severe respiratory distress.

A veno-venous to-and-fro bypass method through a single blood access for extracorporeal lung assist with an artificial membrane lung is introduced. A premature newborn with severe respiratory distress was treated with this method. A 12 Fr. single lumen catheter with a spiral-embedded thin-wall, 0.25 mm in wall thickness, was placed in the right internal jugular vein. Venous blood was withdrawn and oxygenated blood returned alternately through the same catheter. Thus both carotid arteries and other large veins were kept intact. During the extracorporeal bypass, the patient was put on intermittent mandatory ventilation of 2 times/min for lung rest providing adequate arterial blood gases, and he survived.

Cardiopulmonary-cerebral resuscitation by using cardiopulmonary bypass through the femoral vein and artery in dogs.

Twenty-seven dogs, divided into three groups, were subjected to a normothermic ventricular fibrillation (VF) cardiac arrest of 15 min and resuscitated by using cardiopulmonary bypass through the femoral veins and artery (F-F bypass). Group I (n = 15): Cardiac beating did not return in any dogs during an initial 3-min conventional cardiopulmonary resuscitation, but it returned 5.2 +/- 3.8 min (mean +/- S.D.) after the successive initiation of the F-F bypass in all dogs, except in one with bypass trouble. Intermittent burst waves appeared on the electroencephalogram and continuous waves returned, 90.0 +/- 24.7 min and 130.7 +/- 28.1 min after the start of resuscitation, respectively. Values of blood glucose, lactate and potassium 5-15 min after the F-F bypass were significantly higher than those before induction of VF, while those of blood pH, base excess, hemoglobin, hematocrit, platelet and serum protein decreased significantly. Group II (n = 7): Both local cerebral (CBF) and myocardial blood flow (MCBF) returned to the pre-arrest level soon after the initiation of the F-F bypass, even though spontaneous cardiac beating was not yet restored. Closed or open chest cardiac massage could not produce as much blood flow as the F-F bypass did. In the early stage of restoration of spontaneous circulation, temporary interruption of the bypass led to a decrease in both local CBF and MCBF. Group III (n = 5): Spontaneous circulation was restored in all five dogs 5.2 +/- 1.1 min after the institution of the F-F bypass, which was continued for 164 +/- 30 min under mild hypothermia. After intensive care for a subsequent 6-36 h, the animals barked, moved their forelegs and could drink water. The mean neurological deficit score (normal: 0, brain death: 500) was 100.6. However, macroscopic examination of the brain in two dogs with prominent recovery revealed atrophy of the central gyrus and microscopic examination revealed injuries of the vulnerable neurons of the brain.

Development of endocochlear potential and its negative component in mouse cochlea.

The chronological developmental processes of endocochlear potential (EP) and negative endocochlear potential (-EP) were investigated as a function of age from birth in the basal and second cochlear turns in normal ICR-strain mice. The EP of the basal turn developed between 5 and 17 days after birth (DAB). The -EP of the basal turn attained to its mature level on 11 DAB and it increased its absolute value further between 12 and 16 DAB and then, recovered to its mature level again on 20 DAB. The developmental processes of EP and -EP of the second turn followed similar courses to those of the basal turn although they were several millivolts different on each day in detail. The results suggest that the developmental processes of the +EP and the -EP are different. The time of reaching minimum -EP during anoxia were measured and the rate of EP decline were calculated on each animal. The rate of EP decline increased rapidly on 10 DAB, almost coinciding the day which EP began to increase abruptly. Although the rate of EP decline is influenced by several processes, this result showed one of the possibility that the sensitivity of the stria vascularis to hypoxia may develop parallel to the development of the EP.

Endothelin-A receptors mediate vasoconstriction of capillaries in the spiral ligament.

The purpose of this study was to determine whether endothelin-1 (ET-1), endothelin-2 (ET-2) or endothelin-3 (ET-3) alter the vascular diameter of capillaries in the spiral ligament. Changes in vascular tone were measured in capillaries from the isolated spiral ligament in vitro. Capillaries were occluded on one end and opened on the other end. Red blood cells trapped in the capillaries served as markers for a luminal volume defined by the red cell itself, the capillary wall and the occluder. Movement of the red cell toward the open end was taken as evidence for vasoconstriction and movement of the red cell toward the occluder was taken as evidence for vasodilation. The inner diameter of the capillaries was 7.0 microm and decreased maximally by a factor of 0.8 in response to ET-1 and ET-2 (both 10(-8) M). Vasoconstriction induced by ET-1 and ET-2 was concentration-dependent in the range between 10(-12) and 10(-8) M whereas ET-3 (10(-8) M) had no effect. The EC50s for ET-1 and ET-2 were 1.2 x 10(-10) M and 1.4 x 10(-9) M, respectively. Thus, the potency order was ET-1 > ET-2 >> ET-3. Vasoconstriction induced by ET-1 and ET-2 was completely inhibited by the competitive antagonist 10(-6) M BQ-123 (cyclic D-Asp-L-Pro-D-Val-L-Leu-D-Trp). Vasoconstriction induced by ET-1 or ET-2 continued for more than 1 min after removal of agonist from the perfusate. Rapid vasodilation of capillaries preconstricted by ET-1 was observed in response to 10(-3) M sodium nitroprusside. Sodium nitroprusside, however, had no significant effect on the vascular diameter of resting capillaries. These results demonstrate that capillaries in the spiral ligament can constrict and the endothelin-mediated vasoconstriction occurs via ET(A) receptors.

I-123 IMP scintigraphy in two patients with primary pulmonary malignant lymphoma.

123I-IMP lung scintigraphy was performed in two patients with primary malignant lymphoma, whose radiographic features were difficult to differentiate from inflammatory or atelectatic lesions. 123I-IMP scans revealed a defect in the lesions on the delayed (24 hr) image, suggesting a tumorous lesion. 123I-IMP scan may contribute to differential diagnosis of this rare tumorous entity from benign disorders having a different appearance.

Clinical evaluation of vidian neurectomy for nasal allergy.

For the clinical evaluation of vidian neurectomy, questionnaires were sent to 250 cases operated on from 1971 to 1982, with answers obtained from 171. For sneezing, 56.8% of cases were evaluated markedly effective, 36.7% effective, 4.3% unchanged, and 2.2% aggravated. For rhinorrhea, markedly effective was 54.7%; effective, 39.4%; unchanged, 3.7%; aggravated, 2.2%. For nasal obstruction, markedly effective was 67.5%; effective, 27.4%; unchanged, 5.1%; and aggravated, 0%. On the other hand, 20% of cases complained of relapse of nasal allergic symptoms. Concerning the side effects, 28.7% of cases complained of cheek, upper lip, or palate numbness. Decrease of lacrimation was noted in 9.4% of cases. Several kinds of disturbances in the eye movement were observed in 4% of cases. Among them, 16 cases showed complete recovery within 24 h. In 3 cases, abducens paralysis continued for several months. Postoperative arterial bleeding occurred in one case. My recent strategy for the treatment of allergic rhinitis is conservative treatment at first, secondary nasal surgery such as septoplasty or turbinotomy, and at last vidian neurectomy if the patient agrees to be operated on after understanding the side effects.

[Emergency cardiopulmonary bypass (ECPB) for cardiopulmonary-cerebral resuscitation; (2). Physiologic changes].

After normothermic ventricular fibrillation (Vf) cardiac arrest of 15 min, 15 female mongrel dogs received conventional cardiopulmonary resuscitation (CPR) for 3 min and then cardiopulmonary bypass through the femoral artery and veins (F-F bypass). Cardiac beat did not return in any dogs during the initial 3-min CPR. Spontaneous circulation was restored by defibrillation 5.2 +/- 3.8 (mean +/- SD) min after the initiation of the F-F bypass in all dogs except in one with bypass trouble. Life-threatening ventricular dysrhythmias appeared in 8 of the 14 dogs (57%). Eleven of the 14 dogs (79%) were successfully weaned from the F-F bypass. Spontaneous respiration and circulation remained stable for the subsequent 1-h observation period in 8 dog (57%). The values of cardiac output measured just before weaning from the bypass and 30 to 60 min after weaning were significantly lower than those before inducing Vf (n = 5). On the electroencephalogram, intermittent burst waves reappeared 90.0 +/- 24.7 min after the initiation of resuscitation and EEG showed continuous waves 130.7 +/- 28.1 min (n = 7) after the initiation of resuscitation. The values of blood glucose, lactate and potassium 5 to 15 min after the initiation of F-F bypass were significantly higher than those before induction of Vf, while the values of hemoglobin, hematocrit, platelet and serum protein decreased significantly (n = 14).

[Studies of emergency cardiopulmonary bypass (ECPB) for cardiopulmonary-cerebral resuscitation--(3). Neurological outcome and pathological changes of the brain].

Neurological outcome and pathological changes of the brain were studied in 5 female mongrel dogs, which were subjected to normothermic ventricular fibrillation (Vf) cardiac arrest of 15 min and resuscitated by using cardiopulmonary bypass through the femoral artery and veins (F-F bypass). Spontaneous circulation was restored by one or two defibrillating countershocks in all 5 dogs 5.2 +/- 1.1 (mean +/- SD) min after initiation of the F-F bypass. The F-F partial bypass was continued for 164 +/- 30 min under mild hypothermia. After weaning from the bypass, intensive care including controlled ventilation was carried out for the subsequent 6 to 36 h. Intermittent slow waves appeared on the electroencephalogram 62.8 +/- 11.6 min after initiation of the F-F bypass resuscitation and continuous waves at 145.6 +/- 27.5 min. Soon after extubation, the animals barked, moved the forelegs and could drink water. Neurological deficit scores (normal: 0, brain death: 500) improved to become below 100 except in 1 dog. However, macroscopic examination of the brain in 2 dogs with prominent recovery disclosed atrophy of the central gyrus and microscopic examination revealed typical ischemic injuries of the vulnerable neurons at the cerebellum, hippocampus and cerebral cortex in the frontal lobe.

[Studies of emergency cardiopulmonary bypass (ECPB) for cardiopulmonary-cerebral resuscitation; (1) Introduction of a portable-percutaneous ECPB system].

The authors have developed an ECPB system, which can be applied quickly, safely and easily under an emergency condition requiring cardiac massage and artificial ventilation. Fundamentally, the ECPB system consists of 3 parts; a portable ECPB apparatus, a pair of percutaneous cannulae and a short circuit connecting an oxygenator with the cannulae. The ECPB apparatus is assembled with commercially available components (i.e., a centrifugal pump, a battery pack, a temperature controller, a compact membrane oxygenator with a heat exchanger, etc) and they are placed on a mobile cart. The circuit is primed with 300 ml of lactated Ringer solution. The priming can be done within 15 minutes via a reservoir. It is also possible to keep the primed circuit to be ready for emergency use at least for a week. The cannulae are placed intravascularly through the femoral artery and vein by using the Seldinger's percutaneous method. In an emergency situation, the arterial and venous cannulations are carried out separately on the both inguinal regions to save time. The tip of the venous cannula is adjusted to be placed near the right atrium under fluoroscopy. Initiation of ECPB via the femoro-femoral V-A cannulae assures instant and stable supply of oxygenated blood to all of the vital organs. At the present time, nothing is more important than a quick supply of oxygenated blood to the brain to ameliorate the post-ischemic brain damage.

[Sudden decrease in the level of consciousness due to subarachnoid bleeding attack in a patient undergoing ophthalmic surgery under retrobulbar anesthesia].

We experienced a case of intraoperative subarachnoid bleeding attack under retrobulbar anesthesia in a 71 year-old female. Immediately after retrobulbar anesthesia with bupivacaine, the patient showed a sudden decrease in her level of consciousness, respiratory depression, convulsions and her blood pressure increased to 258/63 mmHg. The clinical symptoms and onset of the attack were very similar to those of acute local anesthetic intoxication, where local anesthetics reached the central nervous system through cerebrospinal fluid or via ophthalmic artery. We gave oxygen and provided ventilatory assist by bag and mask, and administered anticonvulsant and antihypertensive agents. After we confirmed recovery of consciousness and stability of hemodynamics and respiration, the extracapsular lens extraction began. The same attack reoccurred 20 minutes later, and we treated the patient with the same procedure as in the first attack and asked the surgeon to shorten the operation. After surgery the patient was diagnosed by computed tomography as having subarachnoid bleeding from a ruptured aneurysm of the anterior cerebral artery. When a patient's level of consciousness suddenly decreases under local anesthesia, we recommend terminating the surgery to clarify the cause. In such cases, serious cardio- and cerebrovascular disorders might be involved, rather than complications due to local anesthetic intoxication.

Effects of neural blockade and general anesthesia on the laser-Doppler skin blood flow waves recorded from the finger or toe.

Effects of neural blockade and general anesthesia on the basic wave (BW) and the reflex wave (RW) among the laser-Doppler (L-D) skin blood flow waves recorded on the finger or toe were studied in 2 volunteers and 42 patients. The BW was continuous, rhythmic and independent of respiratory movements. The RW, which was induced by a deep inspiration or a snapping sound, was a transient marked reduction in blood flow. The BW was almost flattened and the RW was no longer induced at the finger under complete wrist block (n = 2), or under cervical or upper thoracic epidural anesthesia extended caudally over T7 (n = 2). On the other hand, the BW was still detected with reducing frequency and the RW could be provoked with one exception at the finger on the side with a sympathetic ganglion block at the C6 vertebral level (n = 14). The BW and RW at the toe were retained under lumbar subdural anesthesia (n = 6) as well. However, under the combination of lumbar subdural anesthesia and lower thoracic epidural anesthesia extending rostrally over T4 (n = 6), both the BW and the RW disappeared at the toe. In the course of deepening nitrous oxide/enflurane anesthesia (n = 10), the BW gradually reduced in frequency until it was almost flattened, and it became difficult to provoke the RW. L-D flowmetry of the finger or toe could be a useful clinical measure for detecting the presence or absence of sympathetic function controlling cutaneous vasomotion.

To-and-for extracorporeal lung assist (ECLA) through a single catheter-in premature goats as an experimental model of infant respiratory Insufficiency.

A new to-and-fro V-V bypass extracorporeal lung assist (ECLA) through a single catheter as a blood access was investigated for its efficacy on six premature goats delivered by Cesarean section at a gestational age of 118 approximately 139 days as an experimental model of infant respiratory insufficiency, then applied to a human premature infant suffering from life threatening barotrauma that had developed from mechanical pulmonary ventilation. The extracorporeal bypass flow and the gas flow to the artificial membrane lung were controlled to keep Pa(O)(2) above 40 mmHg and Pa(CO)(2) within normal limits. The neonate's own lungs were treated with a continuous positive airway pressure of 5 approximately 12 cmH(2)O, apneic oxygenation or IMV. Two goats weighing 1250 g and 700 g died 2 approximately 2.5 hours after birth from severe circulatory distress. However, the other four neonates which were heavier than 2000 g, were successfully weaned from ECLA, and three of these could be weaned from mechanical ventilation as well. A human infant also survived and was weaned from ECLA on the third day.(Tanoue T, Terasaki H, Sadanaga M et al.: To-and-fro extracorporeal lung assist (ECLA) through a single catheter-in premature goats as an experimental model of infant respiratory insufficiency.

Dermal patch anaesthesia: comparison of 10% lignocaine gel with absorption promoter and EMLA cream.

The analgesic effects of transdermally applied 10% lignocaine aquagel containing 3% glycyrrhetinic acid monohemiphthalate disodium (as an absorption enhancer) and EMLA cream were compared on the forearms of 34 adult volunteers in a double-blind fashion. The mean pinprick pain scores (graded by noting the number of painful pinpricks out of five) at 30, 60 and 90 min after application and 30 min after removal of the anaesthetics were 3.3 (0.3) (mean SE), 1.2 (0.3), 0.3 (0.1) and 0.3 (0.1) respectively, in the lignocaine gel group. Corresponding scores were 3.5 (0.3), 1.5 (0.3), 0.7 (0.2) and 0.1 (0.1) respectively, in the EMLA group. Insertion of a 26-gauge needle into the treated skin to a depth of 1 mm at 90 min after application was not painful in 91% of the volunteers in the lignocaine gel group and 88% of those in the EMLA group. There was no significant difference in any of the corresponding pain scores between the two groups.

Fundamental patterns and characteristics of the laser-Doppler skin blood flow waves recorded from the finger or toe.

Three different components, Basic Wave (BW), Cardiac Wave (CW) and Reflex Wave (RW), among the laser-Doppler (L-D) skin blood flow waves on the finger- or toe-tip, were studied in 32 healthy volunteers. The cycle of the rhythmic BW was 8.1 +/- 1.7.min-1 and was independent of respiratory movements. The BW was synchronous with the baseline fluctuation in the digit-photoplethysmogram. Power spectral analysis of rhythmic fluctuations in the simultaneously recorded R-R interval on ECG, systolic blood pressure, and L-D skin blood flow disclosed that the BW was correspondent with the Mayer wave, i.e., low frequency component. The cycle of the CW was consistent with the heart rate and was superimposed on the BW. The RW was a transient marked reduction in blood flow, which was induced by a deep inspiration or various sensory stimuli. A sympathetic skin response on the palm and a venoconstrictive response on the occluded arm were observed concomitantly with the RW. Good synchronization was observed in each component of the L-D skin flow waves between the fingers and toes. These findings suggest that the BW and the RW on the finger- or toe-tip are predominantly driven by tonic and reflex phasic activities of descending sympathetic outflows via the supraspinal center, respectively.

Simultaneous laser-Doppler flowmetry of canine spinal cord and cerebral blood flow: responses to PaCO2 and blood pressure changes.

We observed the relative changes of both spinal cord blood flow (local SCBF) and local cerebral blood flow (local CBF) using independent laser-Doppler flowmeters (LDF) in 12 dogs under N2O(50%)-O2-enflurane(1.0%) anesthesia. The dorsal surface of the lumbar spinal cord and the parietal surface of the brain were partially exposed. Two fine LDF probes were placed between the exposed surfaces and the dura maters at each site. Both local SCBF and local CBF decreased simultaneously with hyperventilation and increased with hypoventilation within several seconds. The local SCBF responses to PaCO2 changes were similar in direction and degree as those of the local CBF. Autoregulation of local SCBF to arterial blood pressure (ABP) changes was abolished, though that of the local CBF was still recognized in a blunted fashion within a mean ABP range of 50 to 150 mmHg.

High incidence of postoperative pulmonary complications after orthotopic liver transplantation in children.

Postoperative pulmonary complications were investigated in a total of 41 pediatric recipients who underwent orthotopic liver transplantation (OLT) between January, 1990 and March, 1992 at the Royal Children's Hospital, Brisbane. Atelectasis was seen in 40 cases (98%) of the 41 recipients, and occurred in the left lower lobe in 28 cases (68%), and in the right upper lobe in 25 cases (61%). Radiographic pulmonary edema occurred on 23 occasions in 18 recipients (45%). Pulmonary edema was observed just after operation in 9 cases, and in the later stage from the 3rd to 25th postoperative day in 14 cases. Five recipients experienced two episodes of pulmonary edema during their ICU stay. The duration of mechanical ventilatory support was significantly longer in the patients with pulmonary edema than in those without (9.6±3.8vs 3.9±2.2 days,P<0.01). Pleural effusions were observed in 21 cases (52%), of which 18 had right-sided effusion and 3 had bilateral effusions. Pneumothorax occurred in three cases. Pyothorax, hemothorax, bronchial asthma, and subglottic granulation occurred in one case each. The present study demonstrated that postoperative pulmonary complications are frequently observed in pediatric recipients undergoing OLT.