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Tag Archives: cardiothoracic

Ventilation Modes Change Cardiac Output

Take a deep breath. Your diaphragm is contracting downward increasing your intrathoracic volume with a resulting decrease in pressure according to Boyle’s Law. This new pressure is less than that of atmospheric pressure (“negative intrathoracic pressure”), so a gradient is created driving air into your lungs.

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Acute Hemodynamic Management – Aggressive Undertreatment

This post was inspired by a discussion I had with Dr. Les Yarmush, one of my cardiothoracic anesthesia attendings. I’ve become accustomed to titrating many short acting medications to manage hemodynamics in the ICU and operating room arenas. I like to factor in a patient’s comorbidities and “test” their response …

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Maintain Coronary Perfusion!

Maintaining coronary perfusion pressure (CPP) is arguably the most important objective in cardiac anesthesiology. CPP is traditionally defined as the difference between aortic diastolic pressure (AoDP) and left ventricular end-diastolic pressure (LVEDP).

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Hypotension With Initiation Of Cardiopulmonary Bypass

Cardiopulmonary bypass (CPB) circuits are typically primed with ~1500 cc of volume (crystalloid, colloid, and/or blood). If a 70 kilogram male (~ 5 liter blood volume) is placed on CPB, one would expect his hematocrit to drop by 30-40% (hemodilution) with a subsequent decrease in systemic vascular resistance (SVR) –  the …

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