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Related Concept Videos

Ischemic Heart Disease: Overview01:17

Ischemic Heart Disease: Overview

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Ischemic heart disease occurs when the heart's blood supply dwindles, causing an ominous lack of oxygen and nutrients. This deficiency, stemming from reduced or obstructed blood flow, spells danger, leading to heart muscle damage and dysfunction.
Atherosclerosis, the primary malefactor, orchestrates this dangerous condition. It manifests as the accumulation of fatty deposits, akin to insidious plaques, within arterial walls. As time elapses, these plaques metamorphose, hardening and...
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Antianginal Drugs: Calcium Channel Blockers and Ranolazine01:25

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Angina pectoris, a primary symptom of ischemic heart disease, requires careful pharmacological interventions. In this context, calcium channel blockers (CCBs) and ranolazine have emerged as crucial pharmacotherapeutic agents, providing deep insights into the complexities of angina management.
CCBs, a diverse class that includes dihydropyridines (nifedipine) and diphenylalkylamines (verapamil and diltiazem), exert their effect by blocking calcium channels in cardiac and smooth muscle cells. This...
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Pathophysiology of Cardiac Performance01:29

Pathophysiology of Cardiac Performance

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Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
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Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

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The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send...
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Antihypertensive Drugs: Action of Calcium Channel Blockers01:18

Antihypertensive Drugs: Action of Calcium Channel Blockers

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Calcium ions are essential to contract smooth muscle cells in blood vessels. They enter these cells through voltage-dependent calcium channels, specifically L-type calcium channels in the cell membrane. These L-type calcium channels are integral to the excitation-contraction coupling process in smooth muscle. When a stimulus is received by smooth muscle cells, their membrane depolarizes. This alteration in membrane potential instigates the opening of L-type calcium channels. As a result,...
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Coronary Circulation01:21

Coronary Circulation

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The heart, an organ critical to survival, gets nourishment not from the blood it pumps but from a separate circulation system known as coronary circulation. This is the shortest circulation in the body and is responsible for supplying the heart with the nutrients it needs to function effectively.
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Related Experiment Video

Updated: Jul 7, 2025

Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats
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Response shift in coronary artery disease.

Oluwaseyi A Lawal1, Oluwagbohunmi A Awosoga2, Maria J Santana1

  • 1Department of Community Health Sciences, Cumming School of Medicine, University of Calgary, Calgary, Canada.

Quality of Life Research : an International Journal of Quality of Life Aspects of Treatment, Care and Rehabilitation
|December 22, 2023
PubMed
Summary

Response shift significantly impacts patient-reported outcomes in coronary artery disease (CAD) after revascularization. Adjusting for response shift (RS) is crucial for accurately assessing treatment effects in CAD patients undergoing CABG, PCI, or OMT.

Keywords:
Confirmatory factor analysisCoronary artery diseaseLongitudinal dataResponse shiftSeattle Angina Questionnaire

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Area of Science:

  • Cardiology
  • Health Outcomes Research
  • Psychometrics

Background:

  • Coronary artery disease (CAD) significantly impacts patients' quality of life, often necessitating interventions beyond optimal medical therapy (OMT).
  • Patient-reported outcomes (PROs) are vital for evaluating treatment effectiveness, but changes in these outcomes can be influenced by response shift (RS).

Purpose of the Study:

  • To evaluate the impact of response shift (RS) on patient-reported outcomes (PROs) in patients with coronary artery disease (CAD) across different treatment strategies.
  • To assess how RS affects the interpretation of changes in angina symptoms and burden following revascularization procedures versus OMT alone.

Main Methods:

  • Utilized data from the Alberta Provincial Project on Outcome Assessment in Coronary Heart Disease (APPROACH) registry, including 3116 patients with CAD.
  • Employed multi-group confirmatory factor analysis (MG-CFA) to assess measurement invariance and test for RS across treatment groups (coronary artery bypass grafting [CABG], percutaneous coronary intervention [PCI], and OMT) at 2 weeks and 1 year post-angiogram.
  • Administered the 16-item Canadian version of the Seattle Angina Questionnaire (SAQ-CAN) to measure PROs.

Main Results:

  • MG-CFA confirmed partial-strong invariance across treatment groups at 2 weeks.
  • Recalibration RS was detected on the Angina Symptoms and Burden subscale, with magnitudes of 0.32 (OMT), 0.28 (PCI), and 0.53 (CABG).
  • After adjusting for RS, the largest improvements in PROs were observed in the CABG group, while improvements were negligible in the OMT group.

Conclusions:

  • Adjusting for response shift (RS) is recommended when using the SAQ-CAN to evaluate changes in PROs for CAD patients.
  • Accurate assessment of treatment effects, particularly comparing revascularization strategies (CABG, PCI) to OMT, requires accounting for RS.