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PubMed1993

Effect of cerebral blood flow generated during cardiopulmonary resuscitation in dogs on maintenance versus recovery of ATP and pH.

BACKGROUND AND PURPOSE: Cardiopulmonary resuscitation with external chest compression generates low perfusion pressures that may be inadequate for restoring cerebral metabolism and may worsen intracellular pH. We tested the hypothesis that cerebral reperfusion with a low perfusion pressure after arrest restores brain adenosine triphosphate (ATP) and pH to levels attained at the same perfusion pressure without preceding complete ischemia. METHODS: Brain ATP and intracellular pH were measured by magnetic resonance spectroscopy, and cerebral blood flow was measured with microspheres in anesthetized dogs. External chest compressions were begun in group A (n = 6) immediately after the onset of arrest (ie, arrest time zero) and in group B (n = 10) after 6 minutes of arrest (ie, arrest time 6 minutes). In both groups, mean cerebral perfusion pressure was regulated at 30 mm Hg for 70 minutes by adjustment of inflation pressure of a pneumatic thoracic vest. RESULTS: At 12 minutes of resuscitation, cerebral blood flow was 27 +/- 4 mL/min per 100 g in group A and 21 +/- 4 mL/min per 100 g in group B, but ATP in group B (58 +/- 10% of prearrest) was less than in group A (105 +/- 6%). With prolonged resuscitation, ATP deteriorated to near zero levels in dogs in group B, with blood flow less than 15 mL/min per 100 g. Dogs with greater blood flow never achieved complete metabolic recovery. In group B, intracellular pH was unchanged from the 6.3 value at the start of resuscitation, even in those dogs with extremely low blood flows. CONCLUSIONS: Levels of cerebral perfusion pressure sufficient to maintain cerebral oxidative metabolism without complete ischemia during cardiopulmonary resuscitation are not sufficient to restore metabolism after complete ischemia during cardiopulmonary resuscitation. However, low "trickle" blood flow did not worsen intracellular acidosis.

Adenosine Triphosphate↗
PubMed1994

Cardiopulmonary resuscitation by precordial compression but without mechanical ventilation.

It is widely held that mechanical ventilation is essential for cardiopulmonary resuscitation (CPR). However, cardiac output and therefore pulmonary blood flow is reduced to less than one-third of normal during CPR. We therefore reasoned that ventilatory requirements are correspondingly reduced and postulated that gas exchange may be maintained during precordial compression with oxygen passively delivered to the airway in the absence of mechanical ventilation. After tracheal intubation, Sprague-Dawley rats were randomized. Fifteen animals were maintained on positive-pressure ventilation with room air and an additional 15 animals breathed spontaneously. Cardiac arrest was induced by electrical fibrillation. The inspired gas concentration of oxygen was then increased to 100% in both groups. Precordial compression was begun after 4 min of untreated ventricular fibrillation. After an additional 6 min of precordial compression, resuscitation was attempted by DC countershock. During cardiac resuscitation, there were no significant differences in coronary perfusion pressure between mechanically ventilated and spontaneously breathing animals, but arterial PO2 was significantly lower and arterial PCO2 was significantly higher in the absence of positive-pressure ventilation. However, neither resuscitability nor 24-h survival were affected. Postresuscitation myocardial contractility, reflected in the maximally generated dP/dt40, was also not adversely affected. In the unventilated group, only resuscitated animals developed spontaneous gaspings at an average frequency of 17 +/- 2/min-1. The current emphasis on mechanical ventilation as the highest priority for cardiopulmonary resuscitation is therefore not fully supported under the experimental conditions of this study.

Animals↗
PubMed1991

The do-not-resuscitate order. Ethical and legal imperative or medical decision?

Cardiopulmonary resuscitation (CPR), widely used in United States hospitals, results in long-term survival that averages about 15%. The patient has the ethical and legal right to reject CPR. Avoidance of CPR when death is anticipated, or when the patient does not wish resuscitation, requires the writing of a do-not-resuscitate order. Cardiopulmonary resuscitation has the risks of trauma, residual impairment if incompletely successful, and prolongation of dying. Like any other medical treatment, CPR should only be administered if it is expected to confer lasting benefit to the patient. If CPR does not offer even a modicum of lasting benefit, it is not medically appropriate to administer the treatment, and the physician may write a do-not-resuscitate order. The rationale for writing the order should be documented, and the patient and family should be informed of the treatment decision. Hospital regulations regarding the writing of DNR orders should reflect this approach. Experience to date indicates that there is minimal risk of malpractice or criminal action in relation to writing do-not-resuscitate orders.

Beneficence↗
PubMed1989

Exclusion from resuscitation.

Resuscitation was attempted for 156 (19.9%) of the 783 cases in St Thomas's Hospital, aged 16 or over, who suffered first cardiac or respiratory arrest of the current admission during the year to 13 April 1987. Seventeen (11%) of the 156 were discharged alive from hospital after resuscitation. All seventeen had been active outside the home before admission, and all except one remained so after discharge. The factors which were associated with exclusion from resuscitation attempts are analysed. Most accorded with known prognostic factors, but resuscitation was attempted for some persons who seemed to have little chance of benefiting from resuscitation attempts. Routine collection, analysis, and dissemination of information on pre-arrest characteristics in relation to their outcome, on which clinicians can base their decision to with-hold resuscitation in the event of an arrest, is recommended.

Decision Making↗
PubMed2004

Electronic screening of dictated reports to identify patients with do-not-resuscitate status.

OBJECTIVE: Do-not-resuscitate (DNR) orders and advance directives are increasingly prevalent and may affect medical interventions and outcomes. Simple, automated techniques to identify patients with DNR orders do not currently exist but could help avoid costly and time-consuming chart review. This study hypothesized that a decision to withhold cardiopulmonary resuscitation would be included in a patient's dictated reports. The authors developed and validated a simple computerized search method, which screens dictated reports to detect patients with DNR status. METHODS: A list of concepts related to DNR order documentation was developed using emergency department, hospital admission, consult, and hospital discharge reports of 665 consecutive, hospitalized pneumonia patients during a four-year period (1995-1999). The list was validated in an independent group of 190 consecutive inpatients with pneumonia during a five-month period (1999-2000). The reference standard for the presence of DNR orders was manual chart review of all study patients. Sensitivity, specificity, predictive values, and nonerror rates were calculated for individual and combined concepts. RESULTS: The list of concepts included: DNR, Do Not Attempt to Resuscitate (DNAR), DNI, NCR, advanced directive, living will, power of attorney, Cardiopulmonary Resuscitation (CPR), defibrillation, arrest, resuscitate, code, and comfort care. As determined by manual chart review, a DNR order was written for 32.6% of patients in the derivation and for 31.6% in the validation group. Dictated reports included DNR order-related information for 74.5% of patients in the derivation and 73% in the validation group. If mentioned in the dictated report, the combined keyword search had a sensitivity of 74.2% in the derivation group (70.0% in the validation group), a specificity of 91.5% (81.5%), a positive predictive value of 80.9% (63.6%), a negative predictive value of 88.0% (85.5%), and a nonerror rate of 85.9% (77.9%). DNR and resuscitate were the most frequently used and power of attorney and advanced directives the least frequently used terms. CONCLUSION: Dictated hospital reports frequently contained DNR order-related information for patients with a written DNR order. Using an uncomplicated keyword search, electronic screening of dictated reports yielded good accuracy for identifying patients with DNR order information.

Advance Directives↗
PubMed1991

Hypertonic/hyperoncotic fluid resuscitation after hemorrhagic shock in dogs.

We compared canine systemic and cerebral hemodynamics after resuscitation from hemorrhagic shock with 4 mL/kg (a volume approximating 12% of shed blood volume) of 7.2% saline (HS; 1233 mEq/L sodium), 20% hydroxyethyl starch (HES) in 0.8% saline, or a combination fluid consisting of 20% hydroxyethyl starch in 7.2% saline (HS/HES). Eighteen endotracheally intubated mongrel dogs (18-24 kg) were ventilated to maintain normocarbia with 0.5% halothane in nitrous oxide and oxygen (60:40). After a 30-min period of hemorrhagic shock (mean arterial blood pressure = 40 mm Hg), extending from time T0 to T30, animals received one of three randomly assigned intravenous resuscitation fluids: HS, HES, or HS/HES. Data were collected at baseline, at the beginning and end of the shock period (T0 and T30), immediately after fluid infusion (T35), and at 60-min intervals for 2 h (T95, T155). After resuscitation, mean arterial blood pressure and cardiac output increased similarly in all groups, but failed to return to baseline. Intracranial pressure decreased during shock and increased slightly, immediately after resuscitation in all groups. During shock, cerebral blood flow (cerebral venous outflow method) declined in all groups. After resuscitation, cerebral blood flow increased, exceeding baseline in the HS and HS/HES groups but remaining low in the HES group (P less than 0.05 HS vs HES at T35). We conclude that small-volume resuscitation (4 mL/kg) with HS, HS/HES, or HES does not effectively restore or sustain systemic hemodynamics in hemorrhaged dogs. In dogs without intracranial pathology, the effects on cerebral hemodynamics are also comparable, except for transiently greater cerebral blood flow in the HS group in comparison with the HES group.

Animals↗
PubMed2002

Family member presence during cardiopulmonary resuscitation: a survey of US and international critical care professionals.

OBJECTIVE: Recent international emergency cardiovascular care (ECC) and cardiopulmonary resuscitation (CPR) guidelines have recommended that health-care professionals allow family members to be present during resuscitation attempts. To assess whether critical care professionals support these recommendations, we surveyed health-care professionals for their opinions regarding family-witnessed resuscitation (FWR). METHODS: We surveyed health-care professionals attending the International Meeting of the American College of Chest Physicians in San Francisco, CA, from October 23 to 26, 2000, about their CPR experience, their opinions on FWR, and demographic characteristics. The opinions of physicians, nurses, and other allied health professionals were compared, and differences in opinions based on demographics were examined. RESULTS: Five hundred ninety-two professionals were surveyed. Fewer physicians (20%) than nurses and allied health-care workers combined (39%) would allow family member presence during adult CPR (p = 0.0037 [chi(2) test]). Fourteen percent of physicians and 17% of nurses would allow a family presence during pediatric CPR. There was a significant difference among the opinions of US professionals, based on regional location. Professionals practicing in the northeastern states were less likely than other US professionals to allow FWR during adult or pediatric resuscitations (p = 0.016 and p < 0.001, respectively [chi(2) test]). Midwestern professionals were more likely than others to allow family members to be present during an adult resuscitation, when compared to professional in the rest of the nation (p = 0.002 [chi(2) test]). Health-care professionals disapproving of family member presence during CPR did so because of the fear of psychological trauma to family members, performance anxiety affecting the CPR team, medicolegal concerns, and a fear of distraction to the resuscitation team. CONCLUSIONS: Our evaluation indicated that the majority of critical care professionals surveyed do not support the current recommendations provided by the ECC and CPR guidelines of 2000.

Adult↗
PubMed1996

Regional blood flow during severe hypoxemia and resuscitation with 21% or 100% O2 in newborn pigs.

Our aim was to determine whether the use of room air or 100% oxygen has different effects on the peripheral circulation during resuscitation from severe hypoxemia. Twenty-four piglets, 2-to 5-days old, were anesthetized with pentobarbital and randomized to control (n = 5, surgery only) or hypoxemia. Hypoxemia (FiO2 = 0.08) was continued until base excess reached - 20 mml/L. Resuscitation was then performed with 21% (n = 10) or 100% O2 (n = 9) for 25 min followed by 21% O2 in both groups. Regional blood flow was measured with radioactive microspheres. Both hypoxic groups showed marked hyperemia during resuscitation in cardiac and skeletal muscle, a moderate hyperemia in intestine and pancreas while kidneys, liver, spleen and skin showed no hyperemic response. There were no significant differences between the two treatment groups in blood flow to any organ. Arterial oxygen content was significantly higher in the 100% O2 group than in the 21% O2 at 5 and 20 min after onset of resuscitation (11.6 +/- 0.7 and 11.2 +/- 0.6 vs 8.6 +/- 0.3 and 8.7 +/- 0.3 ml/100 ml, p < 0.01). Oxygen delivery was, however, significantly higher in the 100% O2 group than in the 21% O2 group only to the intestine and pancreas at 5 min of resuscitation. We conclude that resuscitation with 21% or 100% oxygen produces similar changes in peripheral blood flow in this porcine model of neonatal hypoxemia.

Animals↗
PubMed2002

The history of neonatal resuscitation.

Attempts at human resuscitation date back to ancient times. Most strategies for resuscitation focused on adults until the early 1800s, when newborn resuscitation captured the interest of noted practitioners. The most promising techniques and strategies for neonatal resuscitation were developed during the latter part of the twentieth century. This article examines the key components of neonatal resuscitation and the discoveries that stimulated the development of current neonatal resuscitation practices.

Heart Massage↗
PubMed1995

Resuscitation with Diaspirin Crosslinked Hemoglobin in a pig model of hemorrhagic shock.

The efficacy of Diaspirin Crosslinked Hemoglobin (DCLHb) as a resuscitative fluid in hemorrhagic shock was compared to another colloid solution (human serum albumin, HSA) and a crystalloid solution (Lactated Ringer's, LR). Hemorrhage (35 mL/kg) was followed by isovolemic exchange then volume replacement. This modeled the clinical situation where resuscitative fluids are administered prior to stopping the hemorrhage, the hemorrhage is stopped, then blood volume is restored. Four combinations of resuscitative fluids were evaluated during isovolemic exchange: volume replacement: DCLHb:LR, HSA:LR, HSA:HSA and LR:LR. All doses were 10 mL/kg:35 mL/kg except LR:LR which was 10 mL/kg:125 mL/kg. Volume replacement was followed by a stabilization period and reinfusion of shed blood (35 mL/kg). MAP increased most rapidly using DCLHb (from 48 to 102 mmHg after 10 min of isovolemic exchange) and was maintained for at least 2 hours. Arterial oxygen content and acid-base status were significantly improved after resuscitation with DCLHb:LR vs. other resuscitative therapies. In conclusion, DCLHb:LR was an effective resuscitative therapy in treatment of hemorrhagic shock.

Animals↗
PubMed1995

Oxyradical generation after resuscitation of hemorrhagic shock with blood or stroma-free hemoglobin solution.

Hypovolemic states are characterized by inadequate tissue perfusion; when this state is reversed, the reintroduction of oxygen is accompanied by the excess generation of oxyradicals and these, in turn, may cause "reperfusion injury" in susceptible tissues. When hemoglobin solution is used to resuscitate the hypovolemic state, the generation of oxyradicals may be enhanced by catalytic means. The generation of oxyradicals was estimated in dogs subjected to the acute removal of 35 ml/Kg blood, and resuscitated 45 mins thereafter with an equal volume of either autologous blood (Group I, n = 6) or 6% stromafree hemoglobin solution (S.F.H.S.) (Group II, n = 6). Hepatic and pancreatic enzymes were measured in blood drawn at intervals. The hypovolemic state was characterized by profound hypotension which was reversed by resuscitation. Oxyradical generation in arterial blood samples, drawn at various times, was estimated by the generation of oxidation products (2,3- and 2,5-dihydroxybenzoic acid) of exogenously administered sodium salicylate, determined by HPLC in plasma samples extracted with diethyl ether. Salicylate oxidation products rose significantly above the baseline value in Group I dogs, whereas they rose 5-6-fold higher than the baseline values in those of Group II. The actual values attained and the increments were significantly (p < .05) greater in Group II than in Group I. In the group resuscitated with S.F.H.S., catalytically active iron concentration in plasma also rose 10-12-fold higher and was associated with spuriously elevated levels of gamma-glutamyl transferase due to interference with the assay. These findings are consistent with the hypothesis that blood-resuscitation of hypovolemic shock is accompanied by oxyradical generation of a modest degree; in contrast, S.F.H.S.-resuscitation introduces catalytically active iron and is accompanied by oxyradical generation of a significantly greater degree.

Animals↗
PubMed1999

Comparison of resuscitation with diaspirin crosslinked hemoglobin (DCLHb) vs fresh blood in a rat burn shock model.

Diaspirin crosslinked hemoglobin (DCLHb; Baxter Healthcare Corp, Deerfield, IL) is hemoglobin-based oxygen carrier which, in our laboratory, improved hemodynamic parameters in a rat burn shock model. Our objective was to compare the effects on hemodynamic parameters and metabolic acidosis of resuscitation with different doses of fresh blood (FB) vs DCLHb. Male Wistar rats (200 to 250 g), surgically prepared for an acute study, were randomly assigned to one of five treatment groups. (n = 8): I. SHAM (not burned, not resuscitated), II. DCLHb 2 ml/kg/% Total Body Surface Area (TBSA) burn and 2 ml/kg/% TBSA burn of Lactated Ringers (LR), III. DCLHb 1 ml/kg/% TBSA burn and 1 ml/kg/% TBSA burn of LR IV. FB 2 ml/kg/% TBSA burn and 2 ml/kg/% TBSA burn of LR V. FB 1 ml/kg/% TBSA burn and 1 ml/kg/% TBSA burn of LR After placement of indwelling catheters, the following baseline hemodynamic values were obtained mean arterial pressure (MAP), cardiac output (CO), stroke volume (SV), systemic vascular resistance (SVR) and base excess (BE). The animals were immediately intravenously resuscitated after receiving a 30% scald burn and were followed for 6 hours. Resuscitation was based on the Parkland formula. Blood was obtained from donor male Wistar rats. The animals were euthanized at 6 hours. MAP remained within normal range in all groups. The SVR, CO, SV and BE were normalized earlier in the LR-DCLHb groups when compared to the LR-FB groups (p < 0.05). Early resuscitation with DCLHb is superior to FB in improving hemodynamics in this model. There appears to be a direct relationship between dose and effect with the use of DCLHb. DCLHb could be useful in decreasing resuscitation fluid requirements in acute burns without compromising general tissue perfusion.

Animals↗
PubMed1989

Outcomes of cardiopulmonary resuscitation in the elderly.

STUDY OBJECTIVE: To determine the success rate of cardiopulmonary resuscitation in the elderly and to define characteristics of elderly patients for whom cardiopulmonary resuscitation is effective. DESIGN: Retrospective chart review. SETTING: Five Boston health-care institutions: two acute-care hospitals; two chronic-care hospitals; and one long-term-care institution. PATIENTS: Five hundred and three consecutive patients aged 70 and over who received cardiopulmonary resuscitation. MEASUREMENTS AND MAIN RESULTS: Of 503 patients, 112 (22%) survived initially but only 19 (3.8%) survived to hospital discharge. The poorest outcomes were for patients with unwitnessed arrests (1 of 116 survived), terminal arrhythmias such as asystole and electromechanical dissociation (1 of 237 survived), and patients with cardiopulmonary resuscitation lasting more than 15 minutes (1 of 360 survived). Only 2 (0.8%; CI, 0.0% to 2.0%) of 244 patients with out-of-hospital cardiopulmonary arrests left the hospital alive. Of 259 patients with in-hospital arrests, 17 (6.5%; CI, 3.4% to 9.6%) survived to discharge. Most survivors had ventricular arrhythmias and were resuscitated within minutes. Initial survivors with either impaired consciousness or functional impairment after the arrest had significantly worse chances of survival than patients without these impairments. CONCLUSION: Cardiopulmonary resuscitation is rarely effective for elderly patients with cardiopulmonary arrests that are either out-of-hospital, unwitnessed, or associated with asystole or electromechanical dissociation.

Age Factors↗
PubMedDate not supplied

Witnessed resuscitation: good practice or not?

Should relatives be given the choice to witness the resuscitation of a family member? From the available literature, three main topic areas emerge: research studies that allow witnessed resuscitation, the effects on relatives of witnessed resuscitation, and A&E staff attitudes towards witnessed resuscitation. There is abundant literature on the positive effects for relatives of witnessing the attempted resuscitation of a loved-one, the main benefit being that the grieving process was made easier. However, staff attitudes are mixed, making witnessed resuscitation a controversial topic.

Cardiopulmonary Resuscitation↗
PubMed1999

[Cardiopulmonary resuscitation. General facts and introduction].

Cardiopulmonary Resuscitation consists of the integration of treatment for cardiorespiratory arrest as a set of standardized steps, whose objective is to first substitute, and later restore, spontaneous respiration and circulation. This calls for a sequential development; this implies that there are not a series of actions which for prematureness influences their order, but these should be applied sequentially at the right time. There are different criteria among the recommendations by the ERC (European Resuscitation Council) and the AHA (American Heart Association). At the present time, the International Liaison Committee of Resuscitation (ILCOR) has developed a series of recommendations which tries to eliminate these differences, as well as simplify the number of steps necessary to achieve a greater diffusion of these techniques which will lead to a higher number of persons saved. There are also agreements on the incorporation of some terms so we will more frequently read the term Basic Vital Support instead of Basic Cardiopulmonary Resuscitation or Advanced Vital Support instead of Advanced Cardiopulmonary Resuscitation. This article is the first of a series of four articles on cardiopulmonary Resuscitation. The remaining articles will appear in later editions of our magazine.

Algorithms↗
PubMed1990

An evaluation of volumes delivered by selected adult disposable resuscitators: the effects of hand size, number of hands used, and use of disposable medical gloves.

UNLABELLED: Due to increasing concern over potential cross-infection during cardiopulmonary resuscitation (CPR), a number of disposable resuscitators have become commercially available. The wearing of disposable medical gloves by persons performing CPR has also become commonplace. In this study, we evaluated the effects of hand size, use of disposable medical gloves, and number of hands used (one versus two) on the volumes delivered by five adult disposable resuscitators. METHOD: Persons familiar with bag-valve ventilation were recruited to participate in the study--eight with small hands, eight with medium hands, and eight with large hands. Ventilation was delivered to one side of a Vent-Aid training test lung (TTL), and volumes were measured with a BEAR VM-90. In random order, each participant ventilated the TTL with all combinations of one hand/two hands, gloves/no gloves, and each of the following resuscitators: Code Blue, Hospitak, Pulmanex, Mercury, and Ambu SPUR. The participants were instructed to ventilate the TTL as they would ventilate a patient. RESULTS: The mean =/- SD volumes (in liters) were small hands = 0.68 +/- 0.15, medium hands = 0.71 +/- 0.18, large hands = 0.81 +/- 0.19 (p=0.006); gloves = 0.73 +/- 0.19, no gloves = 0.73 +/- 0.18 (p=0.80); one hand = 0.62 +/- 0.12, two hands = 0.84 +/- 0.17 (p less than 0.0001); Code Blue = 0.79 +/- 0.14, Hospitak = 0.56 +/- 0.11, Pulmanex = 0.71 +/- 0.15, Mercury = 0.77 +/- 0.18, SPUR = 0.83 +/- 0.2 (p less than 0.0001). CONCLUSIONS: The use of gloves did not significantly affect volume delivery. Delivered volumes did increase significantly as hand size increased and as number of hands used to squeeze the bag increased, and observed differences in volume delivery between brands of resuscitators may be clinically important in some cases. This study emphasizes the importance of squeezing the resuscitator with two hands during bag-valve ventilation.

Adult↗
PubMed1999

Resuscitation endpoints in trauma.

Shock is defined as inadequate perfusion of tissues with oxygen and nutrients to support cellular function. Resuscitation from shock can therefore only be complete when all evidence of oxygen debt, anaerobic metabolism, and tissue acidosis has been eliminated. All of the diagnostic and therapeutic maneuvers performed by trauma nurses today, whether basic or advanced, whether performed in the field, emergency department, operating room, or intensive care unit, can be traced directly or indirectly to this goal. Resuscitation in trauma is now viewed across the continuum of physiologic insult and response that occurs after hemorrhage or tissue injury. Resuscitation endpoints (i.e., variables or parameters) must be viewed across the continuum of shock because the effectiveness of endpoints varies with the phase of resuscitation. The optimal resuscitation endpoint in trauma is controversial, remains elusive, and is one of the most published topics in modern medical literature. This article presents the current understanding of the resuscitation endpoints in trauma.

Blood Gas Analysis↗
PubMed1999

Hospital resuscitation of cardiac arrest patients.

Resuscitation of collapsed cardiac patients is often a not-too-successful affair. It has been repeatedly emphasised that the most important aspect of cardiac resuscitation is early access, early recognition of ventricular fibrillation and early defibrillation in patients with ventricular fibrillation. However, the co-ordination of the various phases of cardiac resuscitation itself, which is often forgotten, would need a good organisation so that a systematic assessment of the patient can be done while resuscitation is in progress. In this report, we describe a case of successful prolonged cardiac resuscitation with emphasis on the organisation of resuscitation as well as early defibrillation. We would also like to emphasise that all procedures that were done were performed correctly and their effects on the monitored patient were assessed frequently so as to maximise efficiency, myocardial salvage and patient survival.

Aged↗