We're unable to sign you in at this time. Please try again in a few minutes.
We were able to sign you in, but your subscription(s) could not be found. Please try again in a few minutes.
There may be a problem with your account. Please contact the AMA Service Center to resolve this issue.
Contact the AMA Service Center:
Telephone: 1 (800) 262-2350 or 1 (312) 670-7827  *   Email: subscriptions@jamanetwork.com
Error Message ......
Article |

Cardiovascular Assist Devices in Cardiogenic Shock

Rolf M. Gunnar, MD; Henry S. Loeb, MD; Sarah A. Johnson, MD; Patrick J. Scanlon, MD
JAMA. 1976;236(14):1619-1621. doi:10.1001/jama.1976.03270150051038.
Text Size: A A A
Published online


AT PRESENT, mechanical circulatory assistance is practical and advantageous for treatment of patients with cardiogenic shock. This technique utilizes a nonocclusive, intraaortic balloon timed to the electrocardiogram (ECG) and monitored by the arterial pulse wave. The balloon inflates just after the aortic valve closes and deflates with the onset of ventricular systole. The inflation forces blood out of the central aorta during cardiac diastole, thereby decreasing central aortic blood volume and increasing pressure. At the onset of systole, balloon deflation decreases aortic pressure so that the left ventricle has less impedance to ejection. The increase in diastolic aortic pressure increases coronary blood flow, while the decreased aortic volume at the onset of systole decreases the work of the left ventricle. The balloon is inserted through the femoral artery and threaded to the descending thoracic aorta just below the origin of the left subclavian artery. Many balloons are designed so that


Sign in

Purchase Options

• Buy this article
• Subscribe to the journal
• Rent this article ?




Also Meets CME requirements for:
Browse CME for all U.S. States
Accreditation Information
The American Medical Association is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians. The AMA designates this journal-based CME activity for a maximum of 1 AMA PRA Category 1 CreditTM per course. Physicians should claim only the credit commensurate with the extent of their participation in the activity. Physicians who complete the CME course and score at least 80% correct on the quiz are eligible for AMA PRA Category 1 CreditTM.
Note: You must get at least of the answers correct to pass this quiz.
Please click the checkbox indicating that you have read the full article in order to submit your answers.
Your answers have been saved for later.
You have not filled in all the answers to complete this quiz
The following questions were not answered:
Sorry, you have unsuccessfully completed this CME quiz with a score of
The following questions were not answered correctly:
Commitment to Change (optional):
Indicate what change(s) you will implement in your practice, if any, based on this CME course.
Your quiz results:
The filled radio buttons indicate your responses. The preferred responses are highlighted
For CME Course: A Proposed Model for Initial Assessment and Management of Acute Heart Failure Syndromes
Indicate what changes(s) you will implement in your practice, if any, based on this CME course.


Some tools below are only available to our subscribers or users with an online account.

0 Citations

Sign in

Purchase Options

• Buy this article
• Subscribe to the journal
• Rent this article ?

Related Content

Customize your page view by dragging & repositioning the boxes below.