Abstract:
:Standard techniques for measuring pulmonary resistance (RP) to gas flow in newborn infants yield results that are widely dispersed and difficult to interpret. The purpose of this study is to describe and evaluate a new improved method for determining RP which utilizes a sinusoidal pressure wave generator. Measurements of respiratory flow rate and transpulmonary pressure were made in cats 1) breathing spontaneously, 2) mechanically ventilated with a time-cycled pressure-limited ventilator, and 3) mechanically ventilated with a sinusoidal pressure wave delivered to the airways. RP values were calculated using 2 methods: 1) at midinhalation (RPI) and midexhalation (RPE), and 2) at iso-volume times during inhalation and exhalation (RP(iso-V)). During spontaneous breathing, RP values were 65 +/- 16 (mean +/- SE), 90 +/- 23 and 78 +/- 27 cm H2O/L . sec for RPI, RPE, and RP(iso-V), respectively. Mechanical ventilation yielded RP values of 35 +/- 4 and 124 +/- 26 cm H2O/L . sec for RPI and RPE, respectively. During sinusoidal airway pressure ventilation, standard errors were reduced; PP values were 33 +/- 4, 54 +/- 6, and 42 +/- 4 cm H2O/L . sec for RPI, RPE, and RP(iso-V), respectively. The use of the sinusoidal pressure wave generator smoothed the pressure-flow data and improved the quality of RP determinations. Coefficients of variation were reduced by 45%. The methods used are simple to apply and may make the determination of RP in ICU patients more practical.
journal_name
Crit Care Medjournal_title
Critical care medicineauthors
Richardson P,Carlstrom JRdoi
10.1097/00003246-198307000-00015subject
Has Abstractpub_date
1983-07-01 00:00:00pages
553-5issue
7eissn
0090-3493issn
1530-0293journal_volume
11pub_type
杂志文章abstract:BACKGROUND:Although survival is traditionally modeled using Cox proportional hazards modeling, this approach may be inappropriate in sepsis, in which the proportional hazards assumption does not hold. Newer, more flexible models, such as Gray's model, may be more appropriate. OBJECTIVES:To construct and compare Gray's...
journal_title:Critical care medicine
pub_type: 杂志文章,多中心研究
doi:10.1097/01.ccm.0000114819.37569.4b
更新日期:2004-03-01 00:00:00
abstract:OBJECTIVES:Augmented renal clearance might lead to subtherapeutic plasma levels of drugs with predominant renal clearance. Early identification of augmented renal clearance remains challenging for the ICU physician. We developed and validated our augmented renal clearance predictor, a clinical prediction model for augm...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/CCM.0000000000004667
更新日期:2020-12-01 00:00:00
abstract:OBJECTIVE:Vascular dysfunction plays a central role in sepsis, and it is characterized by hypotension and hyporesponsiveness to vasoconstrictors. Nitric oxide is regarded as a central element of sepsis vascular dysfunction. The high amounts of nitric oxide produced during sepsis are mainly derived from the inducible is...
journal_title:Critical care medicine
pub_type: 杂志文章,随机对照试验
doi:10.1097/CCM.0000000000000301
更新日期:2014-06-01 00:00:00
abstract::Conventional wisdom suggests that the "human factor" in critical care environments is reason for inadequate medication and patient safety. "Human factors" (or human factors engineering) is also a scientific discipline and practice of improving human performance. Using decades of human factors research, this paper eval...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/CCM.0b013e3181dd8de2
更新日期:2010-06-01 00:00:00
abstract:OBJECTIVE:Heatstroke requires active body cooling and organ failure supportive care. Although heat waves are expected to recur over the next decades, little is known about the risk factors for mortality in heatstroke patients. We examined the prognosis and risk factors for hospital mortality in patients with heatstroke...
journal_title:Critical care medicine
pub_type: 评论,杂志文章,多中心研究
doi:10.1097/01.CCM.0000206469.33615.02
更新日期:2006-04-01 00:00:00
abstract:OBJECTIVES:To evaluate the impact of an emergency department mechanical ventilation protocol on clinical outcomes and adherence to lung-protective ventilation in patients with acute respiratory distress syndrome. DESIGN:Quasi-experimental, before-after trial. SETTING:Emergency department and ICUs of an academic cente...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/CCM.0000000000002268
更新日期:2017-04-01 00:00:00
abstract::Intralipid elimination patterns were compared in 25 healthy controls, 12 patients recovering from uncomplicated cholecystectomy, and 25 critically ill patients. The intravenous fat tolerance test revealed a similar fractional removal rate (k2) in healthy controls and critically ill patients, but k2 was increased in ch...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/00003246-198605000-00009
更新日期:1986-05-01 00:00:00
abstract:OBJECTIVES:To determine the incidence and characteristics of children with brain death in the pediatric intensive care unit (ICU), and to assess the incidence of the clinical triad (Turner's triad) of central diabetes insipidus, low glucose demand, and low CO2 production. DESIGN:Retrospective review of medical records...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/00003246-199408000-00014
更新日期:1994-08-01 00:00:00
abstract:OBJECTIVES:To assess the amount of nutrients delivered, prescribed, and required for critically ill patients and to identify the reasons for discrepancies between prescriptions and requirements and between prescriptions and actual delivery of nutrition. DESIGN:Prospective cohort study. SETTING:Twelve-bed medical inte...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/00003246-200101000-00002
更新日期:2001-01-01 00:00:00
abstract:OBJECTIVE:The use of corticosteroids in patients with sepsis or septic shock has been controversial for many decades. Clinical studies have reported beneficial, as well as negative results. We conducted a meta-analysis to assess the clinical evidence and to evaluate treatment effects in specific subgroups of patients. ...
journal_title:Critical care medicine
pub_type: 杂志文章,meta分析
doi:10.1097/00003246-199507000-00021
更新日期:1995-07-01 00:00:00
abstract:OBJECTIVE:The value of different algorithms that estimate cardiac output (CO) by analysis of a peripheral arterial blood pressure (ABP) waveform has not been definitively identified. In this investigation, we developed a testing data set containing a large number of radial ABP waveform segments and contemporaneous refe...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/CCM.0b013e3181930174
更新日期:2009-01-01 00:00:00
abstract::A computer program is presented which analyzes acid-base and respiratory variables. This program's advantages include limited data input, hand-held portability, error identification, and succinct analysis statements. It is a useful adjunct to daily care of the critically ill. ...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/00003246-198601000-00015
更新日期:1986-01-01 00:00:00
abstract::Cardiac arrest has a poor prognosis, regardless of age group. Children who fail to respond to two standard doses of epinephrine (0.01 mg/kg) rarely survive to hospital discharge, and most die without the return of spontaneous circulation (ROSC). We treated seven consecutive children in cardiac arrest with high dose ep...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/00003246-198912000-00004
更新日期:1989-12-01 00:00:00
abstract::The heart rate variability (HRV) of 82 patients exhibiting sinus rhythm and admitted for possible myocardial infarction (MI) was evaluated. Using a simple information entropy measure to quantify the HRV, patients subsequently diagnosed with MI or experiencing significant dysrhythmia (n = 35) exhibited less entropy (0....
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/00003246-198801000-00014
更新日期:1988-01-01 00:00:00
abstract:OBJECTIVE:Adrenal failure is common in critically ill patients, particularly those with sepsis. As liver failure and sepsis are both associated with increased circulating levels of endotoxin and proinflammatory mediators and reduced levels of apoprotein-1/high-density lipoprotein, we postulated that adrenal failure may...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/01.ccm.0000164541.12106.57
更新日期:2005-06-01 00:00:00
abstract:OBJECTIVE:To examine the relationship between aminoglycoside disposition kinetics and hemodynamic response to sepsis, as well as vital support therapy, in critically ill patients with sepsis. DESIGN:Cross-sectional study of critically ill patients with sepsis undergoing physiologic and aminoglycoside pharmacokinetic m...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/00003246-199705000-00016
更新日期:1997-05-01 00:00:00
abstract:OBJECTIVES:Over 2,500 children undergo hematopoietic stem cell transplantation in the United States each year, and up to 35% require PICU support for life-threatening complications. PICU mortality has dropped from 85% to 44%, but interpretation is confounded by significant cohort heterogeneity. Reports conflict regardi...
journal_title:Critical care medicine
pub_type: 杂志文章,多中心研究
doi:10.1097/CCM.0000000000001085
更新日期:2015-09-01 00:00:00
abstract::Nine ventilator-dependent patients were successfully weaned from mechanical ventilatory support by high-frequency jet ventilation. All patients had been on ventilatory support for at least 2 wk, and had not responded to attempts at weaning by intermittent mandatory ventilation. ...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/00003246-198409000-00021
更新日期:1984-09-01 00:00:00
abstract:OBJECTIVES:To review the immunologic role of the cytokines and the specific role that tumor necrosis factor (TNF) plays in response to infection. The influence of bacterial lipopolysaccharide on TNF, the cytokine cascade, and resultant pathologies are also reviewed. DATA SOURCES:A MEDLINE search of the international E...
journal_title:Critical care medicine
pub_type: 杂志文章,评审
doi:
更新日期:1993-10-01 00:00:00
abstract:OBJECTIVE:To compare the responses of noninvasively measured tissue oxygen saturation (StO2) and calculated muscle oxygen tension (PmO2) to standard hemodynamic variables for early detection of imminent hemodynamic instability during progressive central hypovolemia in humans. DESIGN:Prospective study. SETTING:Researc...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/01.CCM.0000295586.83787.7E
更新日期:2008-01-01 00:00:00
abstract:OBJECTIVE:The beneficial effects of hypertonic saline on neuronal survival and on cerebral blood flow have been shown in several animal models of global and focal brain ischemia. Because of the potential benefits of hypertonic solutions, it is hypothesized that hydroxyethyl starch enhances cerebral blood flow and impro...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/CCM.0b013e31824e6750
更新日期:2012-07-01 00:00:00
abstract::Doppler ultrasound has been used extensively in assessing adequacy of circulation. We have found it to be convenient in the identification of blood flow, particularly in hypotensive states where percutaneous radial artery cannulation of the vessel is tedious and difficult to perform. The technique is simple, atraumati...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/00003246-197611000-00011
更新日期:1976-11-01 00:00:00
abstract::The current definition of sepsis is life-threatening, acute organ dysfunction secondary to a dysregulated host response to infection. Criteria to operationalize this definition can be judged by six domains of usefulness (reliability, content, construct and criterion validity, measurement burden, and timeliness). The r...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/CCM.0000000000001724
更新日期:2016-03-01 00:00:00
abstract:OBJECTIVE:To validate performance characteristics of the intensive care unit (ICU) admission mortality probability model, version III (MPM0-III) on Project IMPACT data submitted in 2004 and 2005. This data set was external from the MPM0-III developmental and internal validation data collected between 2001 and 2004. DE...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/CCM.0b013e31819ded31
更新日期:2009-05-01 00:00:00
abstract:OBJECTIVE:To evaluate the physiology and pharmacokinetics of a novel hemoglobin-based oxygen carrier of bovine origin. DESIGN:Randomized, single-blind, placebo-controlled, dose-escalation study. SETTING:The Upjohn Research Clinics (Kalamazoo, MI). SUBJECTS:Normal healthy adult men between the ages of 18 and 45 yrs. ...
journal_title:Critical care medicine
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1097/00003246-199605000-00006
更新日期:1996-05-01 00:00:00
abstract:OBJECTIVES:To determine bronchoalveolar lavage (BAL) fluid concentrations of keratinocyte growth factor (KGF) and hepatocyte growth factor (HGF), two potent growth factors for alveolar type II epithelial cells, in patients with acute respiratory distress syndrome (ARDS). DESIGN:Prospective study. SETTING:An adult tra...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/00003246-200007000-00024
更新日期:2000-07-01 00:00:00
abstract:OBJECTIVES:a) To investigate whether the patient work of breathing needed to trigger inspiration is affected by the type of ventilator delivering pressure-support ventilation for mechanically ventilated pediatric patients. b) To determine whether changes in oxygen consumption (VO2) trend with changes in work of breathi...
journal_title:Critical care medicine
pub_type: 临床试验,杂志文章,随机对照试验
doi:
更新日期:1994-12-01 00:00:00
abstract:OBJECTIVE:Pathogens that cause pneumonia may be treated in a targeted fashion by antibiotics, but if this therapy fails, then treatment involves only nonspecific supportive measures, independent of the inciting infection. The purpose of this study was to determine whether host response is similar after disparate infect...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/CCM.0b013e3181b4a76b
更新日期:2010-01-01 00:00:00
abstract:OBJECTIVE:To address issues of antibiotic dosing during sustained low-efficiency dialysis by using available pharmacokinetic data, intermittent and continuous renal replacement therapy dialysis guidelines, and our experience with sustained low-efficiency dialysis. DATA RESOURCES:Published clinical trials, case reports...
journal_title:Critical care medicine
pub_type: 杂志文章,评审
doi:10.1097/CCM.0b013e318206c3b2
更新日期:2011-03-01 00:00:00
abstract:OBJECTIVE:To determine the sensitivity, specificity, and predictive values of cultures done with blood drawn through a central venous or arterial catheter compared with peripheral venipuncture. DESIGN:Retrospective cohort study of critically ill surgical patients in whom samples for paired cultures were drawn through ...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/00003246-200201000-00002
更新日期:2002-01-01 00:00:00