PHYSIOLOGY
CARDIAC MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Left stellate ganglion stimulation?
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increase mean arterial pressure
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increase heart rate
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increase left ventricular contractility
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decrease systolic duration
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Explanation:
Detailed explanation-1: -Left stellate ganglion block may shorten the QT interval, whereas right stellate ganglion block lengthens the QT interval.
Detailed explanation-2: -Stellate ganglion stimulation promote AF induction and prolong AF maintenance in atrial and pulmonary sites. The inhibition sympathetic nerve activation by unilateral stellate ganglionectomy can reduce the AF initiating and sustaining.
Detailed explanation-3: -Contractility, an often misused term, defines the performance of the heart at a given preload and afterload. Left ventricular contractility is specifically defined as performance of the ventricle at a given filling pressure and systolic pressure.
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