Overview
Low cardiac output syndrome (LCOS) refers to a state characterized by inadequate cardiac output to meet metabolic demands, often observed post-cardiothoracic surgery or in critically ill patients. It can result from impaired ventricular function, increased afterload, or both, leading to hemodynamic instability 3.Diagnosis
Clinical Presentation: Hypotension, tachycardia, oliguria, and signs of tissue hypoperfusion 3.
Monitoring Techniques: Utilize minimally-invasive cardiac output monitoring devices for accurate assessment; electrical cardiometry shows promising accuracy and precision 2.
Reference Methods: Compare measurements with gold-standard techniques like isotope dilution or electromagnetic flowmeters for validation 4.Management
Afterload Reduction: Continuous intravenous infusion of chlorpromazine (0.05-0.3 mg/kg/hr) can reduce systemic vascular resistance and increase cardiac output 3.
Sedation: Use of sedatives like chlorpromazine for sedation while minimizing negative hemodynamic impacts compared to alternatives like sodium thiamylal 3.
Device Support: Intraaortic balloon pump (IABP) support can be utilized alongside pharmacological interventions to manage hemodynamics 3.Special Populations
Pediatrics: Minimally-invasive cardiac output monitoring systems show variable accuracy and precision; electrical cardiometry is relatively more reliable 2.
Elderly: Specific management strategies are not detailed in the provided abstracts; individualized care based on hemodynamic monitoring is crucial.
Comorbidities: No specific guidance provided in the abstracts for managing LCOS in patients with comorbidities; focus on tailored hemodynamic support is implied 3.Key Recommendations
Utilize minimally-invasive cardiac output monitoring devices, particularly electrical cardiometry, for precise hemodynamic assessment in pediatric patients (Evidence: Moderate 2).
Consider continuous intravenous chlorpromazine for both sedation and afterload reduction in postcardiotomy patients supported by devices like IABP to enhance cardiac output (Evidence: Weak 3).
Employ intraaortic balloon pump support in conjunction with pharmacological interventions to manage hemodynamic instability in LCOS (Evidence: Expert opinion 3).References
1 Roguin A. Adolf Eugen Fick (1829-1901) - The Man Behind the Cardiac Output Equation. The American journal of cardiology 2020. link
2 Suehiro K, Joosten A, Murphy LS, Desebbe O, Alexander B, Kim SH et al.. Accuracy and precision of minimally-invasive cardiac output monitoring in children: a systematic review and meta-analysis. Journal of clinical monitoring and computing 2016. link
3 Mayumi H, Tokunaga K. Constant intravenous infusion of chlorpromazine for both sedation and after-load reduction in postcardiotomy patients under intraaortic balloon pumping. Japanese heart journal 1992. link
4 Adamicza A, Tutsek L, Nagy S. The measurement of cardia output by the thoracic impedance method. Acta physiologica Hungarica 1988. link