Medical MCQ - A 46 years old male patient was given subarachnoid block with bupivacaine (heavy) by the anesthetist. After 10 minutes he was found to have a BP of 72/44 mm Hg and hea rate of 52/min. On checking the level of block it was found to be T6. What is the likely explanation for the bradvcardia?

A 46 years old male patient was given subarachnoid block with bupivacaine (heavy) by the anesthetist. After 10 minutes he was found to have a BP of 72/44 mm Hg and hea rate of 52/min. On checking the level of block it was found to be T6. What is the likely explanation for the bradvcardia?

Bezold-Jarisch reflex

Bainbridge reflex

Block of Cardio-accelerator fibers of synthetic origin

Reverse Bainbridge reflex

Question Category:

Anaesthesia

Correct Answer:

Bezold-Jarisch reflex

Description:

Ans: A. Bezold-Jarisch reflex (Ref 8/e p1970, Miller 7/e p409)The Bezold-Jarisch reflex involves a variety of cardiovascular and neurological processes which cause hypopnea (excessively shallow breathing or an abnormally low respiratory rate) & bradycardia (abnormally low resting hea rate).Possible cause of profound bradycardia and circulatory collapse after spinal anesthesia.Cardioprotective reflex.Implicated in physiologic response to a range of cardiovascular conditions such as myocardial ischemia or infarction, thrombolysis, or revascularization and syncope.Natriuretic peptide receptors stimulated by endogenous ANP or BNP may modulate the Bezold-Jarisch reflex.Less pronounced in patients with cardiac hyperophy or atrial fibrillation

Previous MCQ

Next MCQ

Get More

Subject Mock Tests

Try practicing mock tests with over 200,000 questions from various medical subjects.

Attempt a mock test now

Mock Exam

Attempt an exam of 100 questions randomly chosen from all subjects.

Coming Soon