intra-aortic balloon pumps - awsome · pdf filepractice mcq 3 3. regarding intra-aortic...
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Intra-aortic balloon pumps David Connor
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Overview
• Indications
• Contra-indications
• Practical considerations
• IABP waveforms
• Physiology
• Complications
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Indications
• With proven benefit – Mechanical complications of AMI (acute MR & VSD) – Refractory ventricular arrhythmias – Refractory unstable angina – Decompensated systolic heart failure as a bridge to definitive management
• With possible benefit – Cardiogenic shock secondary to AMI refractory to medical therapy1
– Peri-operative support for high risk CABG – Peri-operative support for high risk cardiac patients undergoing non-cardiac
surgery – Decompensated aortic stenosis
• With no evidence to suggest benefit – Sepsis – Routine use in high-risk patients undergoing PCI2
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Contra-indications
• Absolute – Aortic regurgitation – Aortic dissection – Chronic end-stage heart disease with no anticipation of
recovery – Aortic stents
• Relative – Uncontrolled sepsis – Abdominal aortic aneurysm – Tachyarrhythmias – Severe peripheral vascular disease – Major arterial reconstruction surgery
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Practical considerations • Systemic heparinisation required
• 30-40ml balloon • Inflated with helium or carbon dioxide
• Dual lumen
– Inner lumen connected to pressure transducer
– Outer lumen in continuity with balloon and connected to gas supply
• Electrocardiogram sensor
• Timing ― Inflates on T wave ― Deflates on the R wave
• If poor synchronisation occurs in arrhythmias, the arterial waveform can be used as a substitute
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Positioning IABP
Metallic tip should be 2cm distal to the left subclavian artery On chest x-ray, this is just cephalad to the carina
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Cardiac cycle
Time
Electrocardiogram
T P
R
S Q
Aortic pressure waveform
Dicrotic notch
Systolic pressure
Diastolic pressure
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IABP waveform
Assisted systolic pressure Unassisted systolic pressure
Augmented diastolic pressure
Assisted end-diastolic pressure
Unassisted diastolic pressure
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1:2 augmentation
1:1 augmentation
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Problems with timing
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Inflation prior to AV closure
Waveform • Diastolic augmentation
encroaches onto systole Physiological effects • Potential premature closure of
AV • Increased LVEDV & LVEDP • Increased afterload • Aortic regurgitation • Increased myocardial O2
demand
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Inflation after AV closure
Waveform • Absence of sharp V • Sub-optimal diastolic
augmentation Physiological effects • Sub-optimal coronary artery
perfusion
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Premature deflation during diastole
Waveform • Sharp drop following diastolic
augmentation • Sub-optimal diastolic augmentation • Assisted end diastolic pressure equal
or greater than un-assisted EDP • Assisted systolic pressure may rise Physiological effects • Sub-optimal coronary perfusion • Retrograde coronary/carotid blood
flow • Sub-optimal afterload reduction • Increased myocardial O2 demand
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Late deflation in diastole as AV beginning to open
Waveform • Assisted EDP equal to un-assisted
EDP • Prolonged rate of rise of assisted
systole • Widened diastolic augmentation Physiological effects • Absent afterload reduction • Increased myocardial O2 demand
as LV ejecting against greater resistance
Widened appearance
Prolonged rate of rise of assisted
systole
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Physiology
• Aorta – Reduces systolic pressure – Increases diastolic pressure
• Left ventricle – Reduces systolic pressure – Reduces end-diastolic pressure
• Overall – Reduces afterload – Reduces preload – Increases cardiac output – Increases coronary blood flow
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Physiology
• Diastolic Pressure Time Index (DPTI) – Area between LV pressure and aortic pressure waveform in
diastole – Represents pressure and time available for coronary blood flow
• Tension Time Index (TTI) – Area under the LV pressure waveform in systole – Represents myocardial work and O2 demand
• Endocardial Viability Ratio – Ratio of the DPTI to the TTI – Thought to represent the ratio of myocardial O2 supply to
demand – Myocardial ischaemia likely when ratio <0.7
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Physiology
Augmented coronary
flow
180
160
120
100
80
60
40
20
0
140
Left
co
ron
ary
blo
od
flo
w (
ml/
min
)
Systole Diastole Diastole Systole
BALLOON OFF BALLOON ON 140
120
100
80
60
40
20
0
Ao
rtic
an
d v
entr
icu
lar
pre
ssu
re
wav
es w
ith
an
d w
ith
ou
t b
allo
on
au
gmen
tati
on
(mm
Hg)
TTI DPTI Augmented
DPTI
Aorta
LV
AVO AVO AVC AVC AVO
• Balloon inflation increases pressure difference between aorta and LV which augments the DPTI
• This increases O2 supply
• Balloon deflation reduces the afterload of the LV which reduces the TTI
• This reduces O2 demand
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Complications
• Incidence – Major (2.8%) – Minor (4.2%)
• Vascular – Aortic dissection – Peripheral thrombotic embolisation – False aneurysm or AV fistula formation
• Balloon related – Balloon migration leading to
• Renal ischaemia • Visceral ischaemia • Spinal cord ischaemia • Limb ischaemia
– Balloon rupture leading to gas embolisation – Thrombocytopaenia – Anaemia
• Infection
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Practice SAQ 1
• List the indications and contra-indications for inserting an intra-aortic balloon pump. (35%)
• Describe the mechanism of action and physiological effects of an IABP. (30%)
• What are the potential complications of IABP insertion? (35%)
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Practice MCQ 1
1. Physiological effects of intra-aortic balloon pump include:
• Increase in systolic blood pressure
• Increase in diastolic blood pressure
• Increase in cardiac output
• Decrease in left ventricular end-diastolic pressure
• Increase in coronary blood flow
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Practice MCQ 2
2. Contra-indications to insertion of IABP include:
• Coagulopathy
• Severe mitral regurgitation
• Severe aortic regurgitation
• Chronic end-stage heart disease
• Cardiomyopathy
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Practice MCQ 3
3. Regarding intra-aortic balloon pump: • Helium is used owing to its high density and low
solubility in blood • Optimum time for inflation is just before the
closure of the aortic valve • The balloon should never be turned off in situ • The balloon can be programmed to be time-
cycled • Augmented diastolic pressure is ideally higher
than the patient’s systolic pressure
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Practice MCQ 4
4. Regarding weaning from IABP:
• Weaning should be considered regardless of patient’s inotropic dependence
• The balloon should be turned off and the patient’s haemodynamic status observed
• Removal of the balloon pump may result in an increase in inotropic requirements
• Weaning can be achieved by reducing balloon volume
• Weaning can be achieved by reduced the ratio of augmented to native beats
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Practice MCQ 5
5. Complications associated with IABP include:
• Compartment syndrome
• Aortic dissection
• Arrhythmias
• Thrombocytopaenia
• Cardiac tamponade
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MCQ answers
• 1. FTTTT
• 2. TFTTF
• 3. FFTFT
• 4. FFTTT
• 5. TTFTT
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References
Review articles
• Alaour B & English W, (2011) Intra-aortic balloon
counterpulsation, Anaesthesia Tutorial of the Week 220, http://www.frca.co.uk/Documents/220%20Intra-aortic%20Balloon%20Pump%20Counterpulsation.pdf
• Krishna M & Zacharowski K, (2009) Principles of intra-aortic balloon pump counterpulsation, CEACCP, 9(1): 24-28.
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References
Evidence base
1. Sjauw K et al, (2009) A systematic review and meta-analysis of intra-aortic balloon pump therapy in ST-elevation myocardial infarction: Should we change the guidelines?, European Heart Journal, 30: 459-468.
2. Perera D et al, (2010) Elective intra-aortic balloon counterpulsation during high risk percutaneous coronary intervention: A randomised control trial, JAMA, 304(8): 867-874.