science

Intra-aortic balloon pump

Intra-aortic balloon pump is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Intra-aortic balloon pump rather than just read about it. In short: The intra-aortic balloon pump (IABP) is a mechanical device that increases myocardial oxygen perfusion and indirectly increases cardiac output through afterload reduction. It consists of a cylindrical polyurethane balloon that sits in the aorta, approximately 2 centimeters (0.79 in) from the left subclavian artery.

Key takeaways

Intra-aortic balloon pump belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Intra-aortic balloon pump to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Intra-aortic balloon pump from memory before moving on to harder problems.

Reference excerpt

The intra-aortic balloon pump (IABP) is a mechanical device that increases myocardial oxygen perfusion and indirectly increases cardiac output through afterload reduction. It consists of a cylindrical polyurethane balloon that sits in the aorta, approximately 2 centimeters (0.79 in) from the left subclavian artery. The balloon inflates and deflates via counter pulsation, meaning it actively deflates in systole and inflates in diastole. Systolic deflation decreases afterload through a vacuum effect and indirectly increases forward flow from the heart. Diastolic inflation increases blood flow to the coronary arteries via retrograde flow. These actions combine to decrease myocardial oxygen demand and increase myocardial oxygen supply. A computer-controlled mechanism inflates the balloon with helium from a cylinder during diastole, usually linked to either an electrocardiogram (ECG) or a pressure transducer at the distal tip of the catheter; some IABPs, such as the Datascope System 98XT, allow asynchronous counterpulsation at a set rate, though this setting is rarely used. Helium is used to inflate the balloon as its low density means there is little turbulent flow, so the balloon can inflate quickly and deflate slowly. It is also relatively benign and eliminated quickly if there is a leak or rupture in the balloon. IABPs are typically managed within intensive care units by perfusionists and critical care nurses.

Indications The following situations may benefit from this device.

Cardiogenic shock when used alone as treatment for myocardial infarction. 9–22% survive the first year. Reversible intracardial mechanical defects complicating infarction, i.e. acute mitral regurgitation and septal perforation. Unstable angina pectoris benefits from counterpulsation. Post cardiothoracic surgery—most common and useful is counterpulsation in weaning patients from cardiopulmonary bypass after continued perioperative injury to myocardial tissue. Preoperative use is suggested for high-risk patients such as those with unstable angina with stenosis greater than 70% of main coronary artery, in ventricular dysfunction with an ejection fraction less than 35%. Percutaneous coronary angioplasty In high risk coronary artery bypass graft surgery where cardiopulmonary bypass time was shortened, as well as during intubation period and hospital stay. Thrombolytic therapy of acute myocardial infarction.

Contraindications

Absolute contraindication The following conditions will always exclude patients for treatment:

Severe aortic valve insufficiency Aortic dissection Severe aortoiliac occlusive disease and bilateral carotid stenosis

Relative contraindication The following conditions make IABP therapy inadvisable except under pressing circumstances:

Prosthetic vascular grafts in the aorta Aortic aneurysm Aortofemoral grafts Sepsis

Effects

IABP has a beneficiary effect to the struggling heart. It decreases myocardial demand for oxygen and increases coronary flow.

Complications Since the device is placed in the femoral artery and aorta it could provoke ischemia, and compartment syndrome. The leg is at highest risk of becoming ischemic if the femoral artery it is supplied by becomes obstructed. Placing the balloon too distal from the aortic arch may induce occlusion of the renal artery and subsequent kidney failure. Other possible complications are cerebral embolism during insertion, infection, dissection of the aorta or iliac artery, perforation of the artery and bleeding in the mediastinum. Mechanical failure of the balloon itself is also a risk which entails vascular surgery to remove under that circumstance. After balloon removal there is also a risk of 'embolic shower' from micro clots that have formed on the surface of the balloon, and can lead to peripheral thrombosis, myocardial ischemia, hemodynamic decompensation, and late pseudoaneurysm.

History The first publication of intra-aortic balloon counter-pulsation appeared in the American Heart Journal of May 1962. The device and the balloons were then developed for commercial use between 1967 and 1969 heart surgery by William Rassman at Cornell Medical Center and were manufactured by Datascope Corporation in 1969. The system was subsequently used clinically by David Bregman in 1976 at NewYork-Presbyterian Hospital in New York City. The first clinical implant was performed at Maimonides Medical Center, Brooklyn, N.Y. in June 1967 by Dr. Adrian Kantrowitz and Dr. Steven Phillips. The patient, a 48-year-old woman, was in cardiogenic shock and unresponsive to traditional therapy. An IABP was inserted by a cut down on the left femoral artery. Pumping was performed for approximately 6 hours. Shock reversed and the patient was discharged. The size of the original balloon was 15 French but eventually 9 and 8 French balloons were developed. A second operation removed the balloon. Since 1979 the placement of the balloon has been modified using the Seldinger technique.

See also Cardiogenic shock Ventricular assist device

References

External links Intra-italheartj.org/pdf_files/20050080.pdf Images in cardiovascular medicine The missing intra-aortic balloon pump catheter by Pasquale Totaro, Nello Degno, John Smith, Vincenzo Argano, Cardiac Surgery Department, Regional Cardiac Center, Morriston Hospital, Swansea, UK, Ital Heart J 2005; 6 (4): 361–362)

Illustrations

Intra-aortic balloon pump: Visualization showing an inflated intra-aortic balloon within the descending aorta. — Visualization showing an inflated intra-aortic balloon within the descending aorta.

Worked examples

Example 1 — a first encounter with Intra-aortic balloon pump

Start with the simplest possible case. Write down what Intra-aortic balloon pump claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Intra-aortic balloon pump before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Intra-aortic balloon pump ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Intra-aortic balloon pump

In research: Intra-aortic balloon pump appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Intra-aortic balloon pump in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Intra-aortic balloon pump is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cardiology, Medical pumps, so understanding it makes those chapters shorter.
In everyday life: Look for Intra-aortic balloon pump outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Intra-aortic balloon pump in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Intra-aortic balloon pump means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
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Frequently asked questions

What is Intra-aortic balloon pump in simple terms?

Why does Intra-aortic balloon pump matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Intra-aortic balloon pump?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Intra-aortic balloon pump.