Quiz 4 Flashcards

1
Q

usually for single vessel LIMA to LAD bypass

A

MID-CAB

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2
Q

CaO2 (oxygen content) =

A

1.31 x Hgb x SaO2 + 0.003PaO2

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3
Q

look at slide 11

A

.

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4
Q

OPCAB anesthetic management (6):

A
  • GETA with or without Thoracic Epidural
  • Monitors – Arterial Line, CVP, PAC, TEE, Cerebral Oximetry, 5Lead EKG, Standard ASA monitors
  • Warming Device (forced air, blanket)
  • IVF – Fluid warmers, Colloid vs Crystalloid, RBCs
  • Drugs – Low dose Heparin, Antifibrinolytics, Narcotics
  • CPB on Backup
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5
Q

Graft Harvesting : (4)

A
  • LIMA
  • RIMA
  • LSVG
  • LRad
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6
Q

look at slide 15

A

.

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7
Q

Risks of OPCABG Surgery (6):

A
  • Direct trauma to myocardium
  • Unprotected myocardium with occlusion of coronary targets
  • Decreased cardiac function intra-op
  • Decreased Cardiac Output / Organ perfusion / Systemic Pressure
  • Increased requirement for drips intra-op
  • Decreased graft patency due to technical difficulty or thrombosis
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8
Q

How much oxygen does the heart extract?

A

65 - 75 %

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9
Q

What is the benefit of doing a MIDCAB?

A

-Thoracotomy approach (NO incision through the sternum)

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10
Q

What vessels are involved in a MIDCAB?

A

LIMA to LAD

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11
Q

What contributes the most to cardiac O2 demand?

A

HR

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12
Q

Which has more O2 extraction the SVC or the IVC?

A

SVC

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13
Q

What are a few things that affect mixed venous oxygen?

A
  • Anemia
  • FiO2
  • PEEP
  • Temperature
  • CO
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14
Q

What arteries branches off the Left Main Coronary Artery?

A
  • Left Anterior Descending (LAD)

- Circumflex

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15
Q

The Circumflex perfuses the SA node in ___% of people

A

40

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16
Q

The right coronary artery perfuses the S.A. node in __% and the AV node in __%

A

60 %

80 - 90%

17
Q

What is the percent of people that have a Posterior descending artery perfused by the RCA or referred to as the “________________”.

A

85 % , right dominate system

18
Q

T/F: Adenosine (from ATP breakdown) is probably the MOST important metabolic blood flow regulator.

A

TRUE

19
Q

What determines myocardial O2 demand?

A
  • Heart Rate
  • Contractility
  • Wall Stress
20
Q

What three things determine wall stress?

A
  • Afterload
  • Preload
  • Wall Thickness
21
Q

ST segment depression denotes ___________ ischemia.

A

endocardial

22
Q

ST segment elevation denotes ________ ischemia.

A

transmural