Shock Hemodynamic Assessment

Establish that the patient has circulatory shock by documenting impaired tissue perfusion rather than relying on blood pressure alone. Hypotension is commonly expressed as systolic pressure below 90 mm Hg or mean arterial pressure below 65 mm Hg, but shock may present before sustained hypotension. Track serial lactate, bedside evidence of hypoperfusion, and organ dysfunction because ongoing shock is characterized by elevated lactate, clinical hypoperfusion, and end-organ damage. AHA Journals+2AHA JournalsMixed Shock Complicating Cardiogenic ShockWolters KluwerShock: Pathophysiology, Classification, and the... : Cardiology in ReviewPubMedShock - StatPearls - NCBI Bookshelf

Place an invasive arterial catheter early when shock is present and obtain focused cardiac ultrasound as part of the initial hemodynamic assessment. In suspected cardiogenic shock, contemporary criteria emphasize evidence of low cardiac output and appropriate ventricular filling pressure in addition to tissue hypoperfusion; hypotension alone is an inadequate surrogate for pump failure. Wolters Kluwer+1Wolters KluwerWhat is cardiogenic shock? New clinical criteria urgently... : Current Opinion in Critical CareScienceDirectUse and Implications of Echocardiography in the Hemodynamic Assessment of Cardiogenic Shock - ScienceDirect

Use the first assessment to determine whether the dominant phenotype is distributive, hypovolemic, cardiogenic, obstructive, or mixed. This classification is a treatment decision: volume depletion and preload responsiveness favor a limited fluid strategy; vasodilatory physiology may require vasopressor support; ventricular pump failure, acute valvular or septal pathology, pericardial constraint, or pulmonary vascular obstruction require mechanism-specific intervention rather than empiric repeated fluid boluses. AHA Journals+2AHA JournalsMixed Shock Complicating Cardiogenic ShockScienceDirectUse and Implications of Echocardiography in the Hemodynamic Assessment of Cardiogenic Shock - ScienceDirectPubMedShock - StatPearls - NCBI Bookshelf

Use transthoracic echocardiography early to identify the cardiac contribution to shock and to screen for immediately actionable obstruction or mechanical complications. A focused examination can estimate cardiac output, ventricular filling pressures, pulmonary hemodynamics, right-ventricular function, and congestion status while also identifying shock-specific findings such as McConnell sign in pulmonary embolism and mechanical complications of acute coronary syndrome. ScienceDirectScienceDirectUse and Implications of Echocardiography in the Hemodynamic Assessment of Cardiogenic Shock - ScienceDirect

In suspected cardiogenic shock, define whether the limitation is predominantly left ventricular, right ventricular, biventricular, or structural. This distinction matters because an apparently low-output state with right-sided dysfunction may require a different preload and support strategy than left-sided congestion; refractory cardiogenic shock with right-ventricular dysfunction is a specific setting in which pulmonary artery catheterization has been recommended to clarify hemodynamics. PubMed+1PubMedHemodynamic monitoring in cardiogenic shockPubMedISCCM Guidelines for Hemodynamic Monitoring in the Critically Ill

Repeat focused echocardiography after a major change in clinical status or support strategy when it can answer a new question: whether cardiac output has changed, whether congestion has developed, whether right-heart function has deteriorated, or whether an initially occult structural cause is now apparent. Echocardiography is useful for longitudinal monitoring because it links etiology and hemodynamic profile to pharmacologic and mechanical-support decisions. ScienceDirectScienceDirectUse and Implications of Echocardiography in the Hemodynamic Assessment of Cardiogenic Shock - ScienceDirect

Use passive leg raising when the decision is whether an additional fluid bolus will augment cardiac output. The maneuver transiently autotransfuses blood from the lower extremities; interpret it with a contemporaneous measure of stroke volume or cardiac output rather than with blood pressure alone. Dynamic tests based on respiratory variation, passive leg raising, or small-volume fluid challenges are designed to distinguish patients likely to increase cardiac output from those at risk for fluid overload and worsening congestion. Nature+2NatureHemodynamic Monitoring and Fluid Responsiveness in Critical Care | Intensive Care | Clinical Sciences | Health sciences | Topics | Nature IndexWileyAdvanced Hemodynamic Management in Patients with Septic ShockccjmConsensus on circulatory shock and hemodynamic monitoring. Task ...

Do not use fluid responsiveness as a mandate to administer fluid. A positive dynamic test indicates preload reserve, not necessarily a need for more intravascular volume; integrate the result with tissue perfusion, pulmonary congestion, right-heart function, and the anticipated effect of fluid on the underlying shock mechanism. Nature+1NatureHemodynamic Monitoring and Fluid Responsiveness in Critical Care | Intensive Care | Clinical Sciences | Health sciences | Topics | Nature IndexScienceDirectUse and Implications of Echocardiography in the Hemodynamic Assessment of Cardiogenic Shock - ScienceDirect

Use serial lung ultrasound as a safety boundary during fluid assessment. In the FALLS approach, an A-profile with lung sliding after obstructive and left-sided cardiogenic causes have been excluded supports low filling pressure; clinical improvement after fluid supports hypovolemia. Development of a B-profile without clinical improvement supports distributive/septic physiology rather than continued volume replacement. PubMedPubMedFALLS-protocol: lung ultrasound in hemodynamic assessment of shock - PMC

Escalate from basic monitoring to pulmonary artery catheterization or transpulmonary thermodilution when shock does not resolve after initial fluid administration and vasopressor therapy, when the etiology is mixed or complex, or when basic arterial and central venous monitoring cannot determine the next intervention. These methods can clarify ongoing fluid requirement, vasopressor need, inotropic support, and cardiopulmonary interactions. PubMedPubMedISCCM Guidelines for Hemodynamic Monitoring in the Critically Ill

In cardiogenic shock, use invasive hemodynamics to phenotype severity and guide introduction or optimization of inotropes and vasopressors, timing of mechanical support, and weaning from mechanical circulatory support. Pulmonary artery catheterization is particularly relevant in right-ventricular failure and in cardiogenic shock managed with mechanical circulatory-assist devices. PubMed+1PubMedHemodynamic monitoring in cardiogenic shockPubMedISCCM Guidelines for Hemodynamic Monitoring in the Critically Ill

Select the device according to the unanswered question and local capability. Pulmonary artery catheterization provides pulmonary-artery mixed venous oxygen saturation as an indirect index of tissue oxygenation and is useful for complex cardiopulmonary physiology. Transpulmonary thermodilution is recommended where available for unstable patients with complex cardiopulmonary pathophysiology. PubMed+1PubMedHemodynamic monitoring in cardiogenic shockPubMedISCCM Guidelines for Hemodynamic Monitoring in the Critically Ill

Balance information gain against procedural risk. Reported pulmonary artery catheter complications include insertion-site complications up to 3.6%, heart block in 0.3% to 3.8%, and pulmonary artery rupture in fewer than 1 per 1,000 patients. Use the catheter when its measurements are expected to change management, not solely to obtain more data in a patient whose shock mechanism is already clear and responding to treatment. PubMedPubMedHemodynamic monitoring in cardiogenic shock

Reassess after every meaningful intervention using a consistent set of targets: arterial pressure, cardiac output when measured, lactate trajectory, clinical perfusion, end-organ function, and evidence of congestion. A pressure response alone can be misleading because perfusion failure may persist despite correction of hypotension, particularly when low output or mixed shock remains unresolved. AHA Journals+3AHA JournalsMixed Shock Complicating Cardiogenic ShockWolters KluwerWhat is cardiogenic shock? New clinical criteria urgently... : Current Opinion in Critical CareWolters KluwerShock: Pathophysiology, Classification, and the... : Cardiology in ReviewPubMedHemodynamic monitoring in cardiogenic shock

Use discordance as an escalation trigger. For example, persistent hyperlactatemia despite improved arterial pressure should prompt reassessment of cardiac output, obstruction, occult mixed shock, hepatic clearance, and adrenergic contribution to lactate elevation rather than automatic fluid administration. Wolters Kluwer+2Wolters KluwerShock: Pathophysiology, Classification, and the... : Cardiology in ReviewPubMedHemodynamic monitoring in cardiogenic shockPubMedISCCM Guidelines for Hemodynamic Monitoring in the Critically Ill

In cardiogenic shock, do not regard temporary maintenance of blood pressure with escalating vasopressors or inotropes as successful resuscitation if end-organ perfusion does not recover. The treatment objective is restoration of end-organ perfusion without worsening myocardial oxygen demand and ischemia; failure to recover after etiologic treatment and increasing vasoactive requirements should prompt reassessment for mechanical support and advanced hemodynamic characterization. PubMed+1PubMedHemodynamic monitoring in cardiogenic shockPubMedPulmonary Artery Catheter Monitoring in Patients with Cardiogenic Shock: Time for a Reappraisal?