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VentPlan: a ventilator-management advisor.

VentPlan assists physicians, nurses, and respiratory therapists in the management of artificial respiration for critically ill patients in the intensive-care unit (ICU). VentPlan interprets clinical observations, monitored data, and arterial-blood-gas analyses to make recommendations for setting the ventilator. The VentPlan interface allows users to examine the physiologic model, to inspect details of the data on which the model is based, and to exercise the model to try out different ventilator settings before they implement a new setting. We also report here a preliminary evaluation of VentPlan's ability to predict the arterial oxygen and carbon-dioxide tensions following adjustments to the ventilator. We conclude that VentPlan's physiologic models are acceptably accurate for predicting the effects of small adjustments of the ventilator.

Critical Care↗

Ventilatory effects of percutaneous magnetophrenic stimulation.

This study was conducted with the purpose of elucidating the ventilatory effect of percutaneous magnetic stimulation of the phrenic nerve and investigating the possibility of clinically utilizing this effect as the mechanism of an artificial respirator. A magnetic stimulator consisting of a flat circular coil generating strong magnetic fields up to a maximum of 1.3 Tesla was developed. Formed from 1.8 mm diameter copper wire, this coil is 40 mm in diameter, 14 mm in thickness and has an inductance of 24 microH. The appurtenant current generator can deliver more than 5000 A to the coil. The capacitor terminal voltage (Vc) of the generator was used as a parameter of the intensity of the stimulus. Ventilatory effects were assessed mainly by diaphragmatic electromyogram and by transdiaphragmatic pressure, ventilation flow and tidal volume measurements. Magnetic stimulation was applied percutaneously to a unilateral phrenic nerve in dogs as well as human subjects and also to a median nerve of the forearm in human subjects. The range of stimulatory intensity Vc necessary to obtain ventilatory effects was 400-500 V, and the tidal volume thus obtained corresponded to normal breathing at rest for both dogs and humans. No pain was felt in the vicinity of point of application of the stimulator and there were no significant adverse effects such as changes in the ECG or heart rate. These results indicated that percutaneous magnetic stimulation of the phrenic nerve could produce adequate ventilatory effects in control applications.

Animals↗

[Equipment for respiratory gas conditioning under hygienic conditions].

The significance of respiratory gas conditioning systems as sources of germ colonization and infection of the respiratory tract results from the principle of operation and the temperature. Six respiratory air humidifiers were tested for their hygienic risk in experiments with test germs. Contrary to several reports, some humidifiers were shown to accumulate microorganisms, whereas others do not promote germ population in the respiratory tract even though the water of the humidifier is heavily contaminated. It could be confirmed that basic differences exist between "blow over" and "blow through" humidifiers in the accumulation of microorganisms in respiratory air. Moreover, our investigations revealed that even "blow over" humidifiers should not be considered completely harmless. The "blow over" apparatuses Hydrotrop 200, Aquapor and VH 620 (infant) did not cause any germ propagation in the resuscitation tubes, whereas in the "blow through" apparatuses Bennett Cascade and VH 620 (adult) germ propagation is quite considerable. The mortality kinetics of the germs differ depending on the temperature and the type of apparatus used and should be taken into account when it comes to choosing or developing respiratory gas conditioning devices. Constant heating of the water in the humidifier to a minimum of 50 degrees C provokes a bactericide behaviour of the problem germs. Therefore, it is quite justifiable to do without expensive internationally recommended measures if the humidifier is well chosen. The requirement to replace the humidifier every 24 hours in long-term artificial respiration need not be observed for devices classified as harmless if aseptic handling is guaranteed, i.e. if manual germ transmission by the staff is avoided.

Cross Infection↗

[Differential diagnosis and follow-up of pulmonary disorders by bedside thoracic imaging of intensive care patients].

In this study chest radiographs of 105 patients from an intensive care unit are reviewed to investigate the value in differential diagnosis and control of the course of pulmonary dysfunction. The most helpful criterion in differential diagnosis was the time course of the visible infiltrate on the chest film. Contusion of the lung and aspiration pneumonia showed a steady decrease after an initial maximum, pneumonia and ARDS developed within several days to a maximal infiltration. A rise in extravascular lung water presents with various quickly changing patterns. Pleural effusion, appearance and localisation of the infiltrate are of less value in differential diagnosis. The connection to clinical and anamnestic features is important. There was a good correlation between time course of the radiological visible infiltrate and the intensity of artificial respiration.

Contusions↗

[Patient monitoring].

The main problems of monitoring patients on prolonged artificial respiration are discussed. These are: uninterrupted technical control of the respirator and of its clinical effects; continuous observation of the functioning of tubes, vaporizers and nebulizers; adequate tracheobronchial clearance and breathing therapy is absolutely compulsory. Intensive care units are classified into three categories according to their monitoring and surveillance capacities. The minimum, which corresponds to category I, should be performed by every intensive care unit. Category III includes additional computerized intensive care. The most important parameter for monitoring pulmonary function is blood gas analysis, which has been improved by the introduction of continuous arterial pO2 registration. Haemodynamic control serves for detection of arrhythmias and changes in pump function. The determination of pulmonary shunt flow (Qs/Qt) and of the ratio of dead space to tidal volume (VD/VT) impart information on the overall function of both systems (category II). A nomogram to simplify the calculation of pulmonary shunt is proposed which aggregates the factors contributing most to pulmonary shunt in acute respiratory failure. Its results deviate less than 1% from the calculated values if PCO2 ranges between 32 and 52 mm Hg and the error does not exceed 1.5 per cent with a PCO2 up to 82 mm Hg, unless it is combined with a very low Hb and high mixed venous saturation.

Blood Gas Analysis↗

[Omphalocele and gastroschisis: problems in intensive medical treatment].

Aetiologically and pathognomically, omphalocele and gastroschisis are different forms of occlusive disorders in the anterior abdominal wall of newborns. Their prognosis has clearly improved in recent years, owing to progress in surgical and conservative treatment, primarily on account of improved intensive medical care of the children concerned. Courses and survival rates of newborns with either malformation have proved to depend strongly on the initial condition of the patients. The authors' own studies, in agreement with most of the literature, have shown that the incidence of severe syndromes of malformation has been comparatively high among newborns with omphalocele, whereas children with gastroschisis are usually small-for-date newborns with low birth weight. This has been a frequent limitation to successful treatment. Major importance, in terms of intensive medical treatment, should be attributed to postoperative completely parenteral feeding, throughout the early postsurgical phase during which the patient is particularly endangered from recurrent disorders of passage, as well as to artificial respiration due to respiratory constraint on account of elevated diaphragm and disproportionality between the abdominal cavity and retroposed viscera. Early administration of amino acids, carbohydrates, fat, trace elements, immunoglobulins, and vitamins, with doses being systematically increased by a prespecified pattern, has proved to be necessary to counteract catabolism accompanied by somewhat severe disorders in wound healing, subacute obstruction, and massive attacks of septic infections. This is possible only through central venous catheterization. Resulting thrombotic or septic complications may be mitigated by partial heparinization of the children.(ABSTRACT TRUNCATED AT 250 WORDS)

Abdominal Muscles↗

Diaphragm pacing. Application to a patient with chronic obstructive pulmonary disease.

In a 66-year-old patient with chronic obstructive pulmonary disease (COPD) complicated by arterial hypoxemia and repeated episodes of respiratory and right ventricular failure, a satisfactory level of oxygenation could not be maintained despite controlled oxygen therapy. To enable oxygen to be administered without depression ventilation, artificial respiration by means of phrenic nerve stimulation (diaphragm pacing) has been employed. Evidence of clinical improvement since pacing was begun 32 months ago include fewer episodes of respiratory failure and better control of congestive heart failure despite a gradual worsening of pulmonary function.

Aged↗

[Long-term intubation following tracheotomy].

Between 1981 and 1983 tracheotomy was performed on 61 patients in the Surgical University Clinic of Tübingen. The dominant factors in indication of tracheotomy was for 49% of patients the persistingly necessary artificial respiration, for 26% a better bronchial toilet and other reasons for 25%. With 40.5% of all cases pneumonia was the most frequent complication encountered with our patients. The most frequent bacteria was Pseudomonas aeruginosa. Because of the decisive advantage constituted by the possibility of unproved bronchial toilet an earlier realisation of tracheotomy is to be recommended.

Bronchitis↗

[Artificial ventilation of prematures and new bornes with the bennett pr-2 (author's transl)].

Difficulties and complications during artificial ventilation of prematures and newbornes gave rise to investigate the pressure-flow-characteritics during artificial respiration with the flow-time-cycled respirator Bennett PR-2 in combination with thin tracheal tubes. The flow and corresponding pressures generated by the respirator under different conditions were investigated. It is suggested that a sufficient respiration is not possible with a low generator pressure and high tidal frequencies under pathological conditions as it is often practised.

Humans↗

Tetanus in Japan: trends of mortality, case fatality and causes of death.

The rapid decline of tetanus mortality in recent years, from 2.84 to 0.02 per 10(5) population during the period of 1947-1982 was largely due to the decrease in neonatal tetanus mortality which declined from 36.1 to 0 per 10(5) live birth during the same period (1947-1979). The incidence of neonatal tetanus was inversely related to the percent of babies born in medical institutions. Vaccination against tetanus contributed to the rapid decline of tetanus mortality in the 0 to 9 years old group excluding the neonates, but not necessarily in the other age groups. There was a conspicuous decline in case fatality from about 50-40% during 1940-1970 to 20% and 10% in the periods from 1971-1980 and 1981-1982, respectively. This is attributed to the recent trend of treating tetanus patients in intensive care units where even the most extremely moribund patients have come to be successfully treated in the past few decades. The causes of death of tetanus patients changed from about 1975. Respiratory insufficiency with or without pulmonary infection was predominant in the period from 1961-1974. Unexpected complications, i.e. perforation of esophageal fistula, bleeding from gastrointestinal ulcers, myocardial infarction, respiratory insufficiency due to hyalinosis of alveolar septae associated with prolonged artificial respiration etc. were the major causes of death in the years 1975-1985.

Adult↗

[Severe skin burns caused by a photochemotherapeutic agent].

By uncontrolled application without indication of a photoactive drug methoxypsoralen (Meladinine) which is sold only on prescription a 20-year-old man sustained a large burn injury of 71% of body surface. Because he was admitted to the hospital relatively late, a life-threatening condition developed as it is well known after large body burns. Adequate intensive care including artificial respiration and proper local treatment to prevent infection were decisive for successful treatment.

Adult↗

[Hyperammonemia during parenteral nutrition of intensive-care patients].

Metabolic features of parenteral feeding with conventional amino acid solutions were examined in 47 patients over a long period. 30 patients were kept alive by artificial respiration. The metabolic parameters ammonium, blood urea nitrogen, GOT, alkaline phosphatase were carried out, in 6 patients the pattern of amino acids was analysed. All patients showed a significant increase of ammonium during the course of parenteral feeding. The amino acids demonstrated pattern of imbalance. The other other parameters were not changed significantly. Traumatic, hypoxic or toxic liver damage might influence the reduction of liver function.

Adult↗

[On the problem of optimal warming and moistening of the inspired gases in controlled and assisted artificial ventilation (author's transl)].

The physiological significance of adequate temperature and humidity of respiratory gases and the problems of technical realization are demonstrated. Humidifying and warming of gases by the principle of bubbling through a heated waterbath are believed to be best. The problems with these techniques e.g. dependence of temperature and relative humidity of the gases delivered to the patient on respiratory minute volume, material of the tubing and room temperature are shown. A simple solution to these problems without the need of electrical heated tubing is offered. A new electronically controlled humidifier (H.R.P.-Humidifier 2000) with special developed tubing is presented. Optimal temperature and relative humidity of the respiratory gases is guaranteed by the high efficiency humidifier, and additional measurement and regulation of temperature close to the patients tracheal tube. The problem of increased amounts of condensed water in the tubing is solved by the H.R.P. special tracheal tube adapter with an automatic water exhaust. In addition the hygienic problems of artificial respiration can be solved optimally in combination with the complete H.R.P.-System 2000.

Electronics, Medical↗

[Prilocaine as an hypotensive ocular agent (author's transl)].

The purpose of the present investigation was to determine the action of prilocaine as hypotensive ocular agent. Prilocaine in doses of 2.5 mg/kg, 5 mg/kg and 10 mg/kg was administered intravenously in dogs anesthetized with sodium pentobarbital (30 mg/kg). The experiments show that prilocaine when used i.v. in doses of 2.5 mg/kg and 5 mg/kg causes ocular hypotension in dogs, whereas doses of 10 mg/kg i.v. produce this effect only when artificial respiration is employed, thus preventing the increase of the pCO2 in the blood.

Animals↗

Continuous measurement of arterial PO2. Significance and indications in intensive care.

The use of continuous arterial PO2 monitoring with the aid of intra-arterial electrodes is discussed with reference to 50 patients in an intensive care unit specializing in internal medicine. Monitoring time ranged from 2 h to 15 days. There were no serious complications which could, with certainty, be attributed to the intravascular measurement of PO2. The advantages of this method lie particularly in the early detection of hypoxemias, in the uninterrupted monitoring of artificial respiration and in the immediate indication of favorable and unfavorable response to therapy. Finally, a list is given of possible indications in which this method can be used in intensive medicine.

Aged↗

Kappa opioid receptors modulate cardiorespiratory function in hindbrain nuclei of rat.

The respiratory and cardiovascular effects of selective kappa opioid agonists were compared following microinjection (0.1 microliter) into the nucleus ambiguus (NA) and the nucleus tractus solitarius (NTS) regions of spontaneously breathing and artificially respired pentobarbital-anesthetized rats. In spontaneously breathing animals, the benzomorphan derivative MRZ 2549 (MRZ, 3 X 10(-11) to 16 X 10(-9) mol) elicited dose-related decreases of mean arterial pressure (MAP), heart rate (HR), and tidal volume (TV) following NA injection; bremazocine (BREM) decreased MAP, HR, and respiratory rate (RR). Following NTS injection, MRZ (3 X 10(-10) to 16 X 10(-9) mol) lowered MAP and TV, the highest dose also lowering HR and RR; BREM (3 X 10(-9) to 16 X 10(-9) mol) decreased MAP and HR. Naloxone (200 micrograms/kg, i.v.) reversed the respiratory effects of MRZ without consistently altering cardiovascular activity. In ventilated animals, NA injections of MRZ or BREM (3 X 10(-9) to 16 X 10(-9) mol) elicited a dose-related decrease of MAP without altering HR. These responses were not reversed by naloxone. The stereoisomer of BREM (+ BREM) was without effect at similar doses (3 X 10(-9) to 16 X 10(-9) mol). MRZ (16 X 10(-9) mol) elicited a naloxone-reversible tachycardia following NTS injection in ventilated animals; no other cardiovascular responses were observed following NTS administration of BREM (16 X 10(-9) mol) or lower doses of MRZ. Dynorphin (1-13) (6 X 10(-9) to 60 X 10(-9) mol) significantly lowered MAP without altering HR following NA microinjections in ventilated animals; the lower dose decreased MAP following NTS injections.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗

[Influence of almitrine dimesylate on gas exchange. Preliminary results in patients with chronic obstructive bronchopneumopathies under artificial ventilation].

From a study conducted in 1981 in patients with chronic obstructive pulmonary disease breathing spontaneously, it was concluded that almitrine ensured a more even distribution of ventilation-perfusion ratios in the lung. Another study has recently been undertaken to suppress the effects of stimulated ventilation observed and to measure more accurately the pulmonary vascular effect of this new drug. This was a randomized double-blind drug versus placebo trial using the same doses of almitrine (1.5 mg/kg orally) in patients of the same type under stable artificial respiration controlled by repeated measurements of ventilation during the weaning period at the end of an episode of acute respiratory failure. The preliminary results obtained in one-half of the patients (4 under almitrine, 4 under placebo) are reported. There was little difference in haemodynamic values between the two groups. Improvement in PaO2 was maximum 90 min after almitrine was administered and varied from 0.7 to 1.4 kPa; there was no modification in the control group. In the absence of any change in ventilation and respiratory rate, perfusion was reduced in lung areas with low ventilation-perfusion ratio. These partial results seem to confirm that almitrine exerts a moderate, though real, effect on pulmonary vessels.

Almitrine↗

[Resistance of cortical and hypothalamic neurons to recurrent asphyxia].

Asphyxia produced by discontinuing of artificial respiration for 3-5 min in curarized cats, was well tolerated by some neurons of the cerebral and hypothalamus cortex even when repeated a few times with the interval between asphyxias from 40 to 60 min. In most cases neurons even increased their resistance against subsequent effect of acute oxygen insufficiency preserving for a longer time the spontaneous impulse activity during the second and the third asphyxia.

Adaptation, Physiological↗