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Related Concept Videos

Aortic Regurgitation III: Medical Management01:25

Aortic Regurgitation III: Medical Management

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Aortic regurgitation (AR) is when the aortic valve does not close or seal properly, leading to backward blood circulation from the aorta into the left ventricle during diastole. Common causes of AR include rheumatic heart disease, congenital valve defects, and aortic root dilation. Managing AR requires a multifaceted approach to alleviate symptoms, preserve left ventricular function, and address the underlying cause of the regurgitation. Patients with symptomatic AR or significant left...
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Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

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Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
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Aortic Regurgitation I: Introduction01:15

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IntroductionAortic regurgitation is characterized by the backward flow of blood from the aorta into the left ventricle during diastole and arises from the improper closure of the aortic valve. This condition results in left ventricular volume overload and can stem from both acute and chronic etiologies, each contributing uniquely to the disease's progression and symptomatology.Acute and Chronic CausesAcute aortic regurgitation often results from events that suddenly impair the integrity of the...
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Aortic Regurgitation II: Clinical Features and Diagnostic Tests01:22

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Aortic valve regurgitation (AR) occurs when the aortic valve fails to close properly, allowing blood to flow backward from the aorta into the left ventricle. This backflow can result in two distinct clinical presentations: acute and chronic AR, each characterized by its own set of symptoms and physical findings.Acute Aortic RegurgitationAcute AR presents with a sudden onset of severe symptoms. Patients typically experience profound dyspnea (shortness of breath), chest pain, and signs of left...
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Mitral Stenosis I: Introduction01:22

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Mitral Valve Stenosis (MVS) is a heart condition where the mitral valve narrows, impeding blood circulation from the left atrium to the left ventricle. The etiology and pathophysiology of this condition are multifaceted, leading to a cascade of cardiovascular complications.Causes of Mitral Valve StenosisRheumatic Heart Disease: It is the main cause of mitral valve stenosis, particularly in developing nations. This condition arises from rheumatic fever, an inflammatory illness resulting from...
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Aortic Regurgitation IV: Nursing Management01:17

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A nurse managing a patient with aortic regurgitation begins with a comprehensive assessment, including a review of the patient's medical history, family history, and lifestyle factors. During the cardiac examination, the nurse listens for heart sounds and checks for signs of valve abnormalities. The nurse also observes for symptoms such as dyspnea, orthopnea, and paroxysmal nocturnal dyspnea and assesses the patient's endurance and daily activity tolerance.Based on the findings, the nurse...
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Related Experiment Video

Updated: Mar 23, 2026

Standardized Technique of Aortic Valve Re-implantation for Valve-sparing Aortic Root Replacement
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Complete atrioventricular block after isolated aortic valve replacement.

Andrzej Klapkowski1, Rafał Pawlaczyk, Maciej Kempa

  • 1Gdański Uniwersytet Medyczny. a.klapkowski@gmail.com.

Kardiologia Polska
|April 5, 2016
PubMed
Summary

Prolonged aortic cross-clamp time and electrolyte disturbances are key predictors of permanent pacemaker need after aortic valve surgery. Identifying these factors can help reduce the risk of complete atrioventricular block complications.

Keywords:
aortic valve replacementcomplete atrioventricular blockpermanent pacemaker implantation

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Area of Science:

  • Cardiology
  • Cardiac Surgery
  • Medical Research

Background:

  • Temporary atrioventricular (AV) conduction disturbances are common after cardiac surgery, particularly aortic valve procedures.
  • Permanent complete AV block, requiring a pacemaker, is a rare but serious complication, affecting an estimated 3-6% of patients undergoing aortic valve replacement.

Purpose of the Study:

  • To identify clinical, anatomical, and surgical factors associated with the occurrence of complete AV block necessitating permanent pacemaker implantation.
  • To enhance risk assessment and potentially reduce the incidence of this complication.

Main Methods:

  • A prospective study of 159 consecutive patients undergoing isolated aortic valve surgery between February 2011 and March 2012.
  • Exclusion of patients with pre-existing pacemakers; analysis of clinical data, surgical parameters, and outcomes.
  • Statistical analysis including univariate and multivariate regression models to identify significant predictors.

Main Results:

  • Permanent pacemaker implantation was required in 6.9% of patients following complete AV block lasting at least 7 days.
  • Univariate analysis identified prolonged cardiopulmonary bypass time, aortic cross-clamp time, and electrolyte disturbances as significant factors.
  • Multivariate analysis confirmed prolonged aortic cross-clamp time and electrolyte disturbances as independent predictors of complete AV block.

Conclusions:

  • Permanent complete AV block is a significant complication of aortic valve surgery.
  • Prolonged cardiopulmonary bypass time, prolonged aortic cross-clamp time, larger prosthesis size, endocarditis, and electrolyte disturbances are statistically significant predictors.
  • These findings can inform strategies to mitigate the risk of permanent pacemaker implantation.