Cardiac Innervation - USMLE Forums
USMLE Forums Logo
USMLE Forums         Your Reliable USMLE Online Community     Members     Posts
Home
USMLE Articles
USMLE News
USMLE Polls
USMLE Books
USMLE Apps
Go Back   USMLE Forums > USMLE Step 1 Forum

USMLE Step 1 Forum USMLE Step 1 Discussion Forum: Let's talk about anything related to USMLE Step 1 exam


Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 05-30-2010
USMLE Forums Scout
 
Steps History: Not yet
Posts: 77
Threads: 25
Thanked 108 Times in 29 Posts
Reputation: 118
Heart Cardiac Innervation

A 64-year-old man is brought into the emergency room after experiencing more than 3 h of increasing chest pain that was unrelieved by rest, antacids, or nitroglycerin. He complains of nausea without vomiting. Further questioning reveals a two-year history of exertional angina pectoris (pressing chest pain that often radiated along the inner aspect of the left arm when the patient climbed one flight of stairs). Propranolol, which reduces the response of the heart to stress, and nitroglycerin, which dilates systemic veins as well as coronary arteries, had been prescribed previously. On physical examination he is found to be acyanotic (normal blood oxygenation), tachypneic (rapid breathing), tachycardiac (rapid pulse rate) with a regular rhythm, and diaphoretic (sweating).This patient's tachycardia probably is mediated by reflex arcs associated with decreased cardiac output and possibly reduced blood pressure. The visceral efferent (motor) pathway of this cardiac response is mediated by which of the following?

A.
Carotid branches of the glossopharyngeal nerves
B.
Greater splanchnic nerves
C.
Phrenic nerves
D.
Sympathetic cervical and thoracic cardiac fibers
E.
Vagus and recurrent laryngeal nerves
Reply With Quote Quick reply to this message
The above post was thanked by:
amnios (11-20-2011), drortho (11-29-2011), eve_rb (08-13-2013), jinni (02-22-2012), zohaib (11-20-2011)



  #2  
Old 05-30-2010
Seetal's Avatar
USMLE Forums Master
 
Steps History: Step 1 Only
Posts: 919
Threads: 134
Thanked 1,301 Times in 364 Posts
Reputation: 1324
Send a message via MSN to Seetal
Default

D. sympathetic cervical and thoracic for the heart SANS.
Reply With Quote Quick reply to this message
  #3  
Old 05-30-2010
USMLE Forums Guru
 
Steps History: ---
Posts: 487
Threads: 69
Thanked 294 Times in 133 Posts
Reputation: 314
Default D

i'll go with D. Sympathetic cervical and thoracic cardiac fibers
Reply With Quote Quick reply to this message
  #4  
Old 11-20-2011
dr.muhamad's Avatar
USMLE Forums Guru
 
Steps History: 1 + CS
Posts: 300
Threads: 22
Thanked 97 Times in 62 Posts
Reputation: 107
Default

Quote:
Originally Posted by aungawa View Post
A 64-year-old man is brought into the emergency room after experiencing more than 3 h of increasing chest pain that was unrelieved by rest, antacids, or nitroglycerin. He complains of nausea without vomiting. Further questioning reveals a two-year history of exertional angina pectoris (pressing chest pain that often radiated along the inner aspect of the left arm when the patient climbed one flight of stairs). Propranolol, which reduces the response of the heart to stress, and nitroglycerin, which dilates systemic veins as well as coronary arteries, had been prescribed previously. On physical examination he is found to be acyanotic (normal blood oxygenation), tachypneic (rapid breathing), tachycardiac (rapid pulse rate) with a regular rhythm, and diaphoretic (sweating).This patient's tachycardia probably is mediated by reflex arcs associated with decreased cardiac output and possibly reduced blood pressure. The visceral efferent (motor) pathway of this cardiac response is mediated by which of the following?

A.
Carotid branches of the glossopharyngeal nerves
B.
Greater splanchnic nerves
C.
Phrenic nerves
D.
Sympathetic cervical and thoracic cardiac fibers
E.
Vagus and recurrent laryngeal nerves
why not E??
like if vagus stops the HR increase isnt that true?
Reply With Quote Quick reply to this message
  #5  
Old 11-20-2011
yasirsattar75's Avatar
USMLE Forums Guru
 
Steps History: Not yet
Posts: 395
Threads: 51
Thanked 292 Times in 111 Posts
Reputation: 302
Default

Its E dude !
__________________
study study till ur brain is saturated
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message
The above post was thanked by:
eve_rb (08-13-2013)
  #6  
Old 11-20-2011
USMLE Forums Guru
 
Steps History: Step 1 Only
Posts: 342
Threads: 50
Thanked 197 Times in 103 Posts
Reputation: 207
Default

D,i think . . .but really confused
Reply With Quote Quick reply to this message
  #7  
Old 11-20-2011
USMLE Forums Addict
 
Steps History: Step 1 Only
Posts: 154
Threads: 8
Thanked 134 Times in 62 Posts
Reputation: 144
Default

I would go for D as well, since the response of tachycardia is mediated via Beta one.
Reply With Quote Quick reply to this message
  #8  
Old 02-21-2012
USMLE Forums Scout
 
Steps History: Step 1 Only
Posts: 73
Threads: 10
Thanked 7 Times in 4 Posts
Reputation: 17
Info

,,,,,A,,, i am not sure, but I will choose A, glossopharyngeal nerve, cause vagus nerve is only sensitive in case of increased BP, but glossopharyngeal is sensitive both for increased and decreased BP....
Reply With Quote Quick reply to this message
  #9  
Old 02-22-2012
USMLE Forums Addict
 
Steps History: Not yet
Posts: 175
Threads: 18
Thanked 63 Times in 48 Posts
Reputation: 73
Default

I think they are talking about baroreceptor reflex hence it must be E......
Whats the answer ??????
Reply With Quote Quick reply to this message



Reply

Tags
Anatomy-, Cardiovascular-, Step-1-Questions

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the USMLE Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Medical School
Choose "---" if you don't want to tell. AMG for US & Canadian medical schools. IMG for all other medical schools.
USMLE Steps History
What steps finished! Example: 1+CK+CS+3 = Passed Step 1, Step 2 CK, Step 2 CS, and Step 3.

Choose "---" if you don't want to tell.

Favorite USMLE Books
What USMLE books you really think are useful. Leave blank if you don't want to tell.
Location
Where you live. Leave blank if you don't want to tell.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Cardiac Output - Venous Return Curves Sabio USMLE Step 1 Bits & Pieces 20 09-02-2013 01:37 AM
Why increased cardiac output in anemia! step1addict USMLE Step 1 Bits & Pieces 6 08-24-2012 07:37 PM
Cardiac Bruise ecgram USMLE Step 1 Forum 2 05-22-2010 12:55 PM
Vagus Innervation Farazdaq USMLE Step 1 Forum 1 02-20-2010 04:58 PM

RSS Feed
Find Us on Facebook
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

USMLE® & other trade marks belong to their respective owners, read full disclaimer
USMLE Forums created under Creative Commons 3.0 License. (2009-2014)