Left ventricular function: time-varying elastance and left ventricular aortic coupling.

Abstract:

:Many aspects of left ventricular function are explained by considering ventricular pressure-volume characteristics. Contractility is best measured by the slope, Emax, of the end-systolic pressure-volume relationship. Ventricular systole is usefully characterized by a time-varying elastance (ΔP/ΔV). An extended area, the pressure-volume area, subtended by the ventricular pressure-volume loop (useful mechanical work) and the ESPVR (energy expended without mechanical work), is linearly related to myocardial oxygen consumption per beat. For energetically efficient systolic ejection ventricular elastance should be, and is, matched to aortic elastance. Without matching, the fraction of energy expended without mechanical work increases and energy is lost during ejection across the aortic valve. Ventricular function curves, derived from ventricular pressure-volume characteristics, interact with venous return curves to regulate cardiac output. Thus, consideration of ventricular pressure-volume relationships highlight features that allow the heart to efficiently respond to any demand for cardiac output and oxygen delivery.

journal_name

Crit Care

authors

Walley KR

doi

10.1186/s13054-016-1439-6

subject

Has Abstract

pub_date

2016-09-10 00:00:00

pages

270

eissn

1364-8535

issn

1466-609X

pii

10.1186/s13054-016-1439-6

journal_volume

20

pub_type

杂志文章,评审
  • Endothelin antagonists in subarachnoid hemorrhage: what next?

    abstract::In the previous issue of Critical Care, Ma and colleagues perform a meta-analysis of five randomized, clinical trials of endothelin antagonists in patients with aneurysmal subarachnoid hemorrhage. There are four trials using clazosentan and one trial with TAK-044. These studies show that endothelin plays an important ...

    journal_title:Critical care (London, England)

    pub_type: 评论,杂志文章

    doi:10.1186/cc11822

    authors: Macdonald RL

    更新日期:2012-11-09 00:00:00

  • Antimicrobial exposure and the risk of delirium in critically ill patients.

    abstract:BACKGROUND:Prior retrospective cross-sectional work has associated antimicrobials with a non-specific phrase: encephalopathy without seizures. The purpose of this study is to determine whether different classes of antimicrobials have differential associations with the daily risk of delirium after critical illness is ad...

    journal_title:Critical care (London, England)

    pub_type: 杂志文章

    doi:10.1186/s13054-018-2262-z

    authors: Grahl JJ,Stollings JL,Rakhit S,Person AK,Wang L,Thompson JL,Pandharipande PP,Ely EW,Patel MB

    更新日期:2018-12-12 00:00:00

  • Association between hospital mortality and inspiratory airway pressures in mechanically ventilated patients without acute respiratory distress syndrome: a prospective cohort study.

    abstract:BACKGROUND:Higher inspiratory airway pressures are associated with worse outcomes in mechanically ventilated patients with the acute respiratory distress syndrome (ARDS). This relationship, however, has not been well investigated in patients without ARDS. We hypothesized that higher driving pressures (ΔP) and plateau p...

    journal_title:Critical care (London, England)

    pub_type: 杂志文章

    doi:10.1186/s13054-019-2635-y

    authors: Sahetya SK,Mallow C,Sevransky JE,Martin GS,Girard TD,Brower RG,Checkley W,Society of Critical Care Medicine Discovery Network Critical Illness Outcomes Study Investigators.

    更新日期:2019-11-21 00:00:00

  • Clinical manifestations of disordered microcirculatory perfusion in severe sepsis.

    abstract::Microcirculatory dysfunction plays a pivotal role in the development of the clinical manifestations of severe sepsis. Prior to the advent of new imaging technologies, clinicians had been limited in their ability to assess the microcirculation at the bedside. Clinical evidence of microcirculatory perfusion has historic...

    journal_title:Critical care (London, England)

    pub_type: 杂志文章,评审

    doi:10.1186/cc3744

    authors: Trzeciak S,Rivers EP

    更新日期:2005-01-01 00:00:00

  • In vivo validation of the adequacy calculator for continuous renal replacement therapies.

    abstract:INTRODUCTION:The study was conducted to validate in vivo the Adequacy Calculator, a Microsoft Excel-based program, designed to assess the prescription and delivery of renal replacement therapy in the critical care setting. METHODS:The design was a prospective cohort study, set in two intensive care units of teaching h...

    journal_title:Critical care (London, England)

    pub_type: 杂志文章,多中心研究

    doi:10.1186/cc3517

    authors: Ricci Z,Salvatori G,Bonello M,Pisitkun T,Bolgan I,D'Amico G,Dan M,Piccinni P,Ronco C

    更新日期:2005-06-01 00:00:00

  • Changes in stroke volume induced by passive leg raising in spontaneously breathing patients: comparison between echocardiography and Vigileo/FloTrac device.

    abstract:INTRODUCTION:Passive leg raising (PLR) is a simple reversible maneuver that mimics rapid fluid loading and increases cardiac preload. The effects of this endogenous volume expansion on stroke volume enable the testing of fluid responsiveness with accuracy in spontaneously breathing patients. However, this maneuver requ...

    journal_title:Critical care (London, England)

    pub_type: 杂志文章

    doi:10.1186/cc8195

    authors: Biais M,Vidil L,Sarrabay P,Cottenceau V,Revel P,Sztark F

    更新日期:2009-01-01 00:00:00

  • Early use of imipenem/cilastatin and vancomycin followed by de-escalation versus conventional antimicrobials without de-escalation for patients with hospital-acquired pneumonia in a medical ICU: a randomized clinical trial.

    abstract:INTRODUCTION:Although early use of broad-spectrum antimicrobials in critically ill patients may increase antimicrobial adequacy, uncontrolled use of these agents may select for more-resistant organisms. This study investigated the effects of early use of broad-spectrum antimicrobials in critically ill patients with hos...

    journal_title:Critical care (London, England)

    pub_type: 杂志文章,随机对照试验

    doi:10.1186/cc11197

    authors: Kim JW,Chung J,Choi SH,Jang HJ,Hong SB,Lim CM,Koh Y

    更新日期:2012-02-15 00:00:00

  • Effects of a swallowing and oral care intervention for patients following endotracheal extubation: a pre- and post-intervention study.

    abstract:BACKGROUND:For patients who survive a critical illness and have their oral endotracheal tube removed, dysphagia is highly prevalent, and without intervention, it may persist far beyond hospital discharge. This pre- and post-intervention study with historical controls tested the effects of a swallowing and oral care (SO...

    journal_title:Critical care (London, England)

    pub_type: 杂志文章

    doi:10.1186/s13054-019-2623-2

    authors: Wu CP,Xu YJ,Wang TG,Ku SC,Chan DC,Lee JJ,Wei YC,Hsiao TY,Chen CC

    更新日期:2019-11-09 00:00:00

  • Tight glycemic control in the ICU - is the earth flat?

    abstract::Tight glycemic control in the ICU has been shown to reduce mortality in some but not all prospective randomized control trials. Confounding the interpretation of these studies are differences in how the control was achieved and underlying incidence of hypoglycemia, which can be expected to be affected by the introduct...

    journal_title:Critical care (London, England)

    pub_type: 评论,杂志文章

    doi:10.1186/cc13950

    authors: Steil GM,Agus MS

    更新日期:2014-06-27 00:00:00

  • Revised trauma scoring system to predict in-hospital mortality in the emergency department: Glasgow Coma Scale, Age, and Systolic Blood Pressure score.

    abstract:INTRODUCTION:Our aim in this study was to assess whether the new Glasgow Coma Scale, Age, and Systolic Blood Pressure (GAP) scoring system, which is a modification of the Mechanism, Glasgow Coma Scale, Age, and Arterial Pressure (MGAP) scoring system, better predicts in-hospital mortality and can be applied more easily...

    journal_title:Critical care (London, England)

    pub_type: 杂志文章,多中心研究

    doi:10.1186/cc10348

    authors: Kondo Y,Abe T,Kohshi K,Tokuda Y,Cook EF,Kukita I

    更新日期:2011-08-10 00:00:00

  • Treatment of atelectasis: where is the evidence?

    abstract::Lobar atelectasis is a common problem caused by a variety of mechanisms including resorption atelectasis due to airway obstruction, passive atelectasis from hypoventilation, compressive atelectsis from abdominal distension and adhesive atelectasis due to increased surface tension. However, evidence-based studies on th...

    journal_title:Critical care (London, England)

    pub_type: 评论,杂志文章

    doi:10.1186/cc3766

    authors: Schindler MB

    更新日期:2005-08-01 00:00:00

  • B-type natriuretic peptide release and left ventricular filling pressure assessed by echocardiographic study after subarachnoid hemorrhage: a prospective study in non-cardiac patients.

    abstract:INTRODUCTION:Serum B-type natriuretic peptide (BNP) is frequently elevated after subarachnoid hemorrhage (SAH), but whether this high BNP level is related to transient elevation of left ventricular filling pressure (LVFP) is unknown. However, in patients with preexistent cardiac pathologies, it is impossible to differe...

    journal_title:Critical care (London, England)

    pub_type: 杂志文章

    doi:10.1186/cc7891

    authors: Meaudre E,Jego C,Kenane N,Montcriol A,Boret H,Goutorbe P,Habib G,Palmier B

    更新日期:2009-01-01 00:00:00

  • New versus old blood - the debate continues.

    abstract::Since the inception of blood banking, refinements in laboratory processes have allowed for progressively longer storage times of red blood cells. Whilst advantageous for the logistics of stock management, the clinical impact of the duration of red blood cell storage prior to transfusion remains uncertain, and a topic ...

    journal_title:Critical care (London, England)

    pub_type: 评论,杂志文章

    doi:10.1186/cc8878

    authors: Laurie J,Wyncoll D,Harrison C

    更新日期:2010-01-01 00:00:00

  • Clinical review: Serious adverse events associated with the use of rituximab - a critical care perspective.

    abstract::The advent of biologic agents has provided a more specific and targeted approach to the treatment of various hematological malignancies and other autoimmune disorders. Such biologic agents have been relatively well tolerated with fewer adverse events reported as compared with many other chemotherapeutic agents. Rituxi...

    journal_title:Critical care (London, England)

    pub_type: 杂志文章,评审

    doi:10.1186/cc11304

    authors: Kasi PM,Tawbi HA,Oddis CV,Kulkarni HS

    更新日期:2012-08-31 00:00:00

  • Bench-to-bedside review: carbon dioxide.

    abstract::Carbon dioxide is a waste product of aerobic cellular respiration in all aerobic life forms. PaCO2 represents the balance between the carbon dioxide produced and that eliminated. Hypocapnia remains a common - and generally underappreciated - component of many disease states, including early asthma, high-altitude pulmo...

    journal_title:Critical care (London, England)

    pub_type: 杂志文章,评审

    doi:10.1186/cc8926

    authors: Curley G,Laffey JG,Kavanagh BP

    更新日期:2010-01-01 00:00:00

  • Clinical review: Vasculitis on the intensive care unit--part 1: diagnosis.

    abstract::The first part of this review addresses the diagnosis and differential diagnosis of the primary vasculitides Wegener's granulomatosis, microscopic polyangiitis, Churg-Strauss syndrome and polyarteritis nodosa. Prompt diagnosis and treatment of these conditions ensures an optimal prognosis. The development of assays fo...

    journal_title:Critical care (London, England)

    pub_type: 杂志文章,评审

    doi:10.1186/cc2936

    authors: Semple D,Keogh J,Forni L,Venn R

    更新日期:2005-02-01 00:00:00

  • Pulmonary artery catheter versus pulse contour analysis: a prospective epidemiological study.

    abstract:INTRODUCTION:The choice of invasive systemic haemodynamic monitoring in critically ill patients remains controversial as no multicentre comparative clinical data exist. Accordingly, we sought to study and compare the features and outcomes of patients who receive haemodynamic monitoring with either the pulmonary artery ...

    journal_title:Critical care (London, England)

    pub_type: 杂志文章

    doi:10.1186/cc5126

    authors: Uchino S,Bellomo R,Morimatsu H,Sugihara M,French C,Stephens D,Wendon J,Honore P,Mulder J,Turner A,PAC\/PiCCO Use and Likelihood of Success Evaluation PULSE Study Group.

    更新日期:2006-01-01 00:00:00

  • Success and complications by team composition for prehospital paediatric intubation: a systematic review and meta-analysis.

    abstract:BACKGROUND:Clinical team composition for prehospital paediatric intubation may affect success and complication rates. We performed a systematic review and meta-analysis to determine the success and complication rates by type of clinical team. METHODS:We searched MEDLINE, EMBASE, and CINAHL for interventional and obser...

    journal_title:Critical care (London, England)

    pub_type: 杂志文章,meta分析

    doi:10.1186/s13054-020-02865-y

    authors: Garner AA,Bennett N,Weatherall A,Lee A

    更新日期:2020-04-15 00:00:00

  • In-hospital airway management of COVID-19 patients.

    abstract::Those involved in the airway management of COVID-19 patients are particularly at risk. Here, we describe a practical, stepwise protocol for safe in-hospital airway management in patients with suspected or confirmed COVID-19 infection. ...

    journal_title:Critical care (London, England)

    pub_type: 杂志文章,评审

    doi:10.1186/s13054-020-03018-x

    authors: Sullivan EH,Gibson LE,Berra L,Chang MG,Bittner EA

    更新日期:2020-06-05 00:00:00

  • Variation in the PaO2/FiO2 ratio with FiO2: mathematical and experimental description, and clinical relevance.

    abstract:INTRODUCTION:Previous studies have shown through theoretical analyses that the ratio of the partial pressure of oxygen in arterial blood (PaO2) to the inspired oxygen fraction (FiO2) varies with the FiO2 level. The aim of the present study was to evaluate the relevance of this variation both theoretically and experimen...

    journal_title:Critical care (London, England)

    pub_type: 杂志文章

    doi:10.1186/cc6174

    authors: Karbing DS,Kjaergaard S,Smith BW,Espersen K,Allerød C,Andreassen S,Rees SE

    更新日期:2007-01-01 00:00:00

  • Preserving spontaneous breathing during mechanical ventilatory support: an old yet fascinating story.

    abstract::Facilitation of early spontaneous breathing activity is the most important measure to shorten weaning and avoid ventilator-induced lung injury and diaphragmatic injury in mechanically ventilated patients. However, the optimal degree of spontaneous muscle activity and ventilator support remains to be determined. Furthe...

    journal_title:Critical care (London, England)

    pub_type: 评论,杂志文章

    doi:10.1186/cc13120

    authors: Calzia E,Dembinski R

    更新日期:2013-11-19 00:00:00

  • Nutrition support practices in critically ill head-injured patients: a global perspective.

    abstract:BACKGROUND:Critical illness following head injury is associated with a hypermetabolic state but there are insufficient epidemiological data describing acute nutrition delivery to this group of patients. Furthermore, there is little information describing relationships between nutrition and clinical outcomes in this pop...

    journal_title:Critical care (London, England)

    pub_type: 杂志文章

    doi:10.1186/s13054-015-1177-1

    authors: Chapple LA,Chapman MJ,Lange K,Deane AM,Heyland DK

    更新日期:2016-01-07 00:00:00

  • A French multicenter randomised trial comparing two dose-regimens of prothrombin complex concentrates in urgent anticoagulation reversal.

    abstract:INTRODUCTION:Prothrombin complex concentrates (PCC) are haemostatic blood preparations indicated for urgent anticoagulation reversal, though the optimal dose for effective reversal is still under debate. The latest generation of PCCs include four coagulation factors, the so-called 4-factor PCC. The aim of this study wa...

    journal_title:Critical care (London, England)

    pub_type: 杂志文章,多中心研究,随机对照试验

    doi:10.1186/cc11923

    authors: Kerebel D,Joly LM,Honnart D,Schmidt J,Galanaud D,Negrier C,Kursten F,Coriat P,Lex206 Investigator Group.

    更新日期:2013-01-10 00:00:00

  • The practice of intensive care in Latin America: a survey of academic intensivists.

    abstract:BACKGROUND:Intensive care medicine is a relatively young discipline that has rapidly grown into a full-fledged medical subspecialty. Intensivists are responsible for managing an ever-increasing number of patients with complex, life-threatening diseases. Several factors may influence their performance, including age, tr...

    journal_title:Critical care (London, England)

    pub_type: 杂志文章

    doi:10.1186/s13054-018-1956-6

    authors: Castro R,Nin N,Ríos F,Alegría L,Estenssoro E,Murias G,Friedman G,Jibaja M,Ospina-Tascon G,Hurtado J,Marín MDC,Machado FR,Cavalcanti AB,Dubin A,Azevedo L,Cecconi M,Bakker J,Hernandez G,Latin-American Intensive Care Net

    更新日期:2018-02-21 00:00:00

  • Longitudinal changes of inflammatory parameters and their correlation with disease severity and outcomes in patients with COVID-19 from Wuhan, China.

    abstract:BACKGROUND:Coronavirus disease 2019 (COVID-19) is a newly emerging infectious disease and rapidly escalating epidemic caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The pathogenesis of COVID-19 remains to be elucidated. We aimed to clarify correlation of systemic inflammation with disease s...

    journal_title:Critical care (London, England)

    pub_type: 杂志文章

    doi:10.1186/s13054-020-03255-0

    authors: Zeng Z,Yu H,Chen H,Qi W,Chen L,Chen G,Yan W,Chen T,Ning Q,Han M,Wu D

    更新日期:2020-08-27 00:00:00

  • Why the C-statistic is not informative to evaluate early warning scores and what metrics to use.

    abstract::Metrics typically used to report the performance of an early warning score (EWS), such as the area under the receiver operator characteristic curve or C-statistic, are not useful for pre-implementation analyses. Because physiological deterioration has an extremely low prevalence of 0.02 per patient-day, these metrics ...

    journal_title:Critical care (London, England)

    pub_type: 杂志文章

    doi:10.1186/s13054-015-0999-1

    authors: Romero-Brufau S,Huddleston JM,Escobar GJ,Liebow M

    更新日期:2015-08-13 00:00:00

  • Identification and characterisation of the high-risk surgical population in the United Kingdom.

    abstract:INTRODUCTION:Little is known about mortality rates following general surgical procedures in the United Kingdom. Deaths are most common in the 'high-risk' surgical population consisting mainly of older patients, with coexisting medical disease, who undergo major surgery. Only limited data are presently available to desc...

    journal_title:Critical care (London, England)

    pub_type: 杂志文章

    doi:10.1186/cc4928

    authors: Pearse RM,Harrison DA,James P,Watson D,Hinds C,Rhodes A,Grounds RM,Bennett ED

    更新日期:2006-01-01 00:00:00

  • Endotoxemia and mortality prediction in ICU and other settings: underlying risk and co-detection of gram negative bacteremia are confounders.

    abstract:INTRODUCTION:The interdependence between endotoxemia, gram negative (GN) bacteremia and mortality has been extensively studied. Underlying patient risk and GN bacteremia types are possible confounders of the relationship. METHODS:Published studies with ≥ 10 patients in either ICU or non-ICU settings, endotoxemia detec...

    journal_title:Critical care (London, England)

    pub_type: 杂志文章,评审

    doi:10.1186/cc11462

    authors: Hurley JC,Guidet B,Offenstadt G,Maury E

    更新日期:2012-08-07 00:00:00

  • Association between time of discharge from ICU and hospital mortality: a systematic review and meta-analysis.

    abstract:BACKGROUND:Epidemiological studies have provided inconsistent results on whether intensive care unit (ICU) discharge at night and on weekends is associated with an increased risk of mortality. This systematic review and meta-analysis aimed to determine whether ICU discharge time was associated with hospital mortality. ...

    journal_title:Critical care (London, England)

    pub_type: 杂志文章,meta分析,评审

    doi:10.1186/s13054-016-1569-x

    authors: Yang S,Wang Z,Liu Z,Wang J,Ma L

    更新日期:2016-12-01 00:00:00

  • Circulating cytokines in predicting development of severe acute pancreatitis.

    abstract::Acute pancreatitis is an inflammatory disease process which may present with clinical manifestations ranging from benign self-limited disease to overwhelming sepsis. The ability to predict outcome would be helpful in developing treatment plans, and possibly in stratifying patients for clinical trials. ...

    journal_title:Critical care (London, England)

    pub_type: 评论,杂志文章

    doi:10.1186/s13054-014-0575-0

    authors: Rotstein OD

    更新日期:2014-10-20 00:00:00