cardiovascular support of the elderly
TRANSCRIPT
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Haemodynamic Support for the Elderly
Richard Peter von Rahden
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RP von Rahden : Affiliations
• Grey’s Hospital, Pietermaritzburg• Head: Grey’s Hospital Intensive Care Unit
• KwaZulu-Natal Department of Health• Pietermaritzburg Department of Anaesthesia, Critical
Care & Pain Management
• University of KwaZulu-Natal• Division of Anaesthesia & Critical Care
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Conflicts of Interest
• Nil current
• Last ten years:• Overseas conferences: Fresenius-Kabi, Adcock
Ingram Critical Care, Aspen
• Lecturing honoraria: Fresenius-Kabi, B Braun
• Advisory board: Fresenius-Kabi
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“Haemodynamic Support for the Elderly”
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“U becomes V”
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“Closer to the edge of the cliff”
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Ageing
“Physiological involution”
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Years
40 Start
65 Statistical
80 Obvious
120 End
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Parallel
Cumulative comorbidities
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Other organ systems : Renal
• GFR falls
• Tubule dysfunction
…Water retention
…Less clearance
…Less water resorption
…Electrolyte handling poor
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Other organ systems : Body
• Less muscle
• Connective tissue
• Changed water/kg
…Weak
…Less fat / mass
…Altered Vd
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Other organ systems : CNS
• Neurochemicals
• Altered receptors
• Altered ANS tone
…Delirium risk
…Oversedation
…“Weak” SNS
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Other organ systems : Lungs
• Structural changes
• Muscle weakness
• Hyperinflation
…Hypoxaemia risk
…Less efficient respiration
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CVS Aging
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Vessels
• Thicker walls• fibrosis
• Less elastic
• Narrower lumen
• Endothelial senescence• Less NO
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Vessels
• Lower arterial compliance• Increased LV afterload
• Lower venous compliance• Impaired RV preload handling
• Less reservoir
• Less buffer
• Impaired delivery at tissues
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Systolic Hypertension
• Aorta loses elasticity
• LV systole and ejection : less stretch• Higher Systolic Blood Pressure
• LV diastole : less “bounce-back”• Lower Diastolic Blood Pressure generated
• LV perfused in diastole : DBP = driving pressure
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Effects of Systolic Hypertension
• Increased LV work during systole• O2 demand
• Poorer LV perfusion during systole• O2 supply
• myocardial ischaemia risk
• pulse pressure : AKI risk
• Lower DBP implies WORSE disease
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Ventricles
• Afterload concentric hypertrophy• Pressure overload : Laplace’s Law
• Myocyte necrosis & apoptosis• Replacement fibrosis
• Survivors hypertrophy (“erratic hypertrophy”)
• Thicker wall• Smaller chamber
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Ventricles
• Impaired DO2 from coronaries • Thick wall : diffusion distance
• Endo-ischaemia
• Systolic dysfunction• Limited contractile reserve
• Diastolic dysfunction• Preload variation intolerance
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Diastolic dysfunction
• Left Ventricular End-Diastolic Volume (preload) must be “just right”
• LVEDV a bit low : SV drops
• LVEDV a bit large : back-pressure, congestion• Pulmonary oedema
• Passive LV filling in early diastole reduced
• LV filling depends on atrial contraction
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U V concept
IdealPreload
Dysfunction
Collapse
Death
Young OLD
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Valves
• Sclerosis• Fibrose, calcify
• Aortic sclerosis• Bark worse than bite
• But adds to LV afterload
• Limits ability to increase Cardiac Output if afterload drop
• Papillary muscle dysfunction
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Conduction
• SA nodal cells involute
• Atrial fibrosis
• Shrinkage of conduction tracts
• Long intervals, arrhythmias, blocks
• Atrial arrhythmias (eg AF) : loss of atrial filling
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Innervation
• Beta adrenoceptors reduced function & number• Reduced SNS cardioacceleration
• Reduced agonist response
• Alpha adrenoceptors slight reduction• Vasoplegia risk
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Closer to the cliff-edge
• High afterload
• “Inappropriate” preload
• Diastolic dysfunction
• Valve problems
• Arrhythmia & block risk
• Dependent on atrial “kick”
• Poor inotrope response
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Loss of reserve
• Maximum heart rate• “220-age”
• Stroke Volume augmentation limited
• Maximum Cardiac Index falls with age• 8+ 3 L/min/m2
• Less cardiac output reserve
• Cardiac failure “just waiting to happen”.
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Myocardial ischaemia risk
• Inevitable coronary artery narrowing with age• Worse if atherosclerosis too
• Limits blood supply
• Increased Cardiac Output worse supply/demand imbalance
• Tachycardia increases demand, decreases supply
• Myocardial infarction : “NSTEMI type”• COMMON! POOR OUTCOMES! Missed unless troponin done
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Elective anaesthesia
Staying away from the cliff-edge
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Anaesthesia choice
• Try regional!
• Induction agent choice
• Maintenance choice
• Contracted Vd, more sensitive, less clearance
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Setting targets
• Sinus rhythm
• Heart rate
• Fluid status
• Mean arterial pressure
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Mean Arterial Pressure
• Set a target range and actively maintain it• 65-70?
• 70-75?
• 80% of pre-induction value?
• Most accurate measure : A line mandated?
• High BP spikes … undesirable
• Post-Induction Hypotension … WORSE• Pre-emptive vasopressor?
• Phenylephrine 0.1-1mg/kg/min?
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Fluid status
• Hardest to guess
• Intravascular volume matters
• Systolic Pressure Variation / Pulse Pressure Variation / Stroke Volume Variation • … if ventilated
• PLR, TTE difficult during anaesthesia
• CVP ?
• Cardiac Output Monitor?
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Central Venous Pressure
• Volume Pressure• 2 wobbly chambers, across lungs, position
• Not predictive in most of its range• Do not chase a magic number
• Very low (0 / -ve): extreme depletion
• Very high: overload, cardiac failure.
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Cardiac Output Monitoring
• Know the tool• Vigileo
• PiCCO / LiDCO
• Cardio-Q
• Ultrasound – cardiac function monitor
• Which parameter to measure?
• >10% improvement in Stroke Volume• After 3ml/kg fluid CHALLENGE
• … fluid WAS good
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The shocked elderly patient
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Circulatory shock
Life-threatening state
of
generalized acute circulatory failure
leading to
inadequate oxygen delivery to cells
relative to their needs
resulting in
cell dysfunction and death
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Or
DO2 < VO2
death
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Systemic macrocirculation
Pump
PipesArteries | Veins
Fluid
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Shock mechanisms
• Pump failure cardiogenic
• Pipe expansion distributive
• Fluid loss hypovolaemic
• Blockage obstructive
(intrinsic | extrinsic)
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Cardiogenic shock
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Acute Heart Failure with Reduced Ejection Fraction
• Fluid overload: congestion, pulmonary oedema
• Not severely hypotensive
• BNP : support diagnosis
• Troponin, CK-MB : ischaemic cause
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AHFrEF management
• Oxygen
• Furosemide diuresis
• Nitrate infusion
• Positive pressure : CPAP / PEEP+PS
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Positive airway pressure
• Good for Left Ventricle with systolic failure• Reduces afterload (less transmural pressure gradient)
• Reduces LV preload
• Front line in pulmonary oedema from LVSF
• Less benefit in LV diastolic failure
• Risky in RV failure• Reduces preload, can increase afterload
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Cardiogenic shock
• Oxygen
• Positive airway pressure : mask CPAP / PS
• Dobutamine inotrope• Inevitable risk in ischaemic heart disease
• SBP < 90mmHg• Adrenaline?
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Combination shock states
Classical example : septic shock
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Combination shock
• Single initiating shock mechanism
• Aggravated by dysregulated immune response• Microbial products
• Damaged tissue
• Develops into combination shock state
hypovolaemic + distributive + cardiogenic ± obstructive
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Septic shock in elderly
• Premorbid compromise due to age
• + Hypovolaemic shock : capillary leak
• + Distributive shock : venous pooling
• + Cardiogenic shock : cardiodepressants
• “U V” phenomenon• Minimal leeway until irretrievable collapse
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Lack of signs
• Septic shock in young adults : florid• Fluid depleted
• Vasodilated, warm (unless grossly hypovolaemic)
• Cardiac Index above normal
• Septic shock in elderly : missable• Fluid depleted … often occult
• Less dilated … often shut down
• Cardiac Index can’t increase
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In elderly
Be suspicious!
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Supportive care
• Broad-spectrum empiric antibiotics 1st dose early• Culture first: Stop if non-septic cause found
• Appropriate analgesia (± sedation)
• REWARMING
• Glucose control (5-10mmol/l)
• Coagulation management
• Stress ulcer prophylaxis
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Arrhythmia management
• Bradyarrhythmias : pacing• Chemical (adrenaline) | TRANSCUTANEOUS | TV
• Tachyarrhythmias• Keep K+ > 4mmol/l, Mg2+ > 1mmol/l
• Early synchronized cardioversion
• Amiodarone
• 15-30min infusion 150mg for reversible causes
• Full therapeutic load if several boluses needed, or “old heart”
• Hypotension problem
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Work of Breathing
• Respiratory compensation for metabolic acidosis = hyperventilation
• High energy demand• Respiratory muscles can demand blood flow higher
than elderly patient’s maximum Cardiac Output
• Hyperventilation drives cardiac failure!
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Relieve Work of Breathing!
• Do early mechanical ventilation in shocked elderly : continue until shock resolved• Generally mandates invasive ventilation
• NIV not good here
• Controlled mode, fully offload the patient
• Lung-protective volumes (6ml/kg PMFH)
• AVOID HYPOCARBIA … cerebral vasoconstriction
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Patients will need…
• Fluids• Boluses to refill intravascular volume
• Infusions to maintain intravascular volume
• Vasopressors
• Inotropes• More in elderly than in young
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We must pursue…
• A primary target• Mean Arterial Pressure
• 65-70mmHg
• Higher if previously hypertensive?
• A secondary target : balance fluids & vasoRx• Cardiac Index
• A tertiary target• Improved perfusion : lactate clearance, UO, GCS
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Fluids
• Get every monitor you can• Arterial line
• Cardiac output monitor
• Ultrasound• IVC
• Cardiac filling
• Assess the effect of every bolus• Improving MAP and CI?
• “Baseline maintenance infusion” 1ml/kg/h
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Fluid types
• Ringer’s Lactate default• Normal Saline ONLY if hyponatraemic
• Chloride kills kidneys!
• Inflammatory states damage glycocalyx• Colloids leak too
• Haemoglobin target : 7g/dl for most• 10g/dl for cardiac becoming disputed
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Vasoactives : No
• Need: vasoconstriction + inotropy
• Noradrenaline international recommendation• Not available (practically) in SA
• Dopamine• Depresses thyroid function, impairs immunity
• INDIRECT AGENT
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Vasoactives : Not alone
• Dobutamine• Inotrope
• Vasodilator
• NOT AS FIRST THERAPY IN INFLAMMATORY SHOCK STATES
• CAUTION IF PATIENT HYPOTENSIVE
• Phenylephrine• Vasoconstrictor (veins, ARTERIES)
• Beyond 1mcg/kg/min, needs cardiac monitoring
• Overconstriction afterload LV failure
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Vasoactives : OK
• Adrenaline• Inotrope, chronotrope (Beta receptors)
• “Too much” … tachycardia
• But Beta receptor downregulation
• Vasoconstrictor (Alpha receptors)
• Titrate in range 0.03-0.8mcg/kg/min in elderly
• Can combine submaximal doses with DOBT / PHNL
• Phenylephrine + dobutamine• Less tachycardia risk
• Must have Cardiac Output measurement
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Perpetual review process
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Cycle of constant challenges
• Set MAP goal• Achieve it using fluids and vasoactives
• When achieved : challenge and query• Is this fluid : vasoactive balance the best?
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Example : baseline fluid
• Start 1ml / kg / h
• If multiple fluid boluses needed• Increase “Baseline Maintenance Infusion” rate
• Review in maximum 2 hours
• If no boluses were required• Decrease “Baseline Maintenance Infusion” rate
• Boluses were still needed – increase further• If not – decrease “Baseline Infusion” further
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This is not easy
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The V is narrow
• Actively monitor every intervention
• Clinical | Haemodynamic | Invasive
• Cardiac & lung Ultrasound
• Treat aggressively to targets
• Full attention required
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The cliff phenomenon
• Elderly have less leeway before getting into irreversible failure.
• Some haemodynamic combinations are irreversible• “over the cliff”
• Myocardial ischaemia• After even short supply/demand imbalance
• OCCULT MYOCARDIAL INFARCTION FREQUENT.
![Page 75: Cardiovascular Support of the Elderly](https://reader036.vdocument.in/reader036/viewer/2022081506/62a39cc2f393d21c1637cdb4/html5/thumbnails/75.jpg)
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Often… no second chances
![Page 76: Cardiovascular Support of the Elderly](https://reader036.vdocument.in/reader036/viewer/2022081506/62a39cc2f393d21c1637cdb4/html5/thumbnails/76.jpg)
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![Page 77: Cardiovascular Support of the Elderly](https://reader036.vdocument.in/reader036/viewer/2022081506/62a39cc2f393d21c1637cdb4/html5/thumbnails/77.jpg)
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Thank you.