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Cardiac Cycle01:29

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The cardiac cycle refers to the sequence of events that occur in the heart from the beginning of one heartbeat to the next. It's characterized by alternating periods of contraction (systole) and relaxation (diastole) of the heart muscles.
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The heart beats rhythmically in a sequence called the cardiac cycle—a rapid coordination of contraction (systole) and relaxation (diastole).
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Electrical signals—sent from the sinoatrial (SA) node in the right atrial wall to the atrioventricular (AV) node between the right atrium and right ventricle—cause both atria to simultaneously contract. When the signal reaches the AV node, it pauses for approximately a tenth of a second, allowing the atria to contract and...
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As muscle contracts, the overlap between the thin and thick filaments increases, decreasing the length of the sarcomere—the contractile unit of the muscle—using energy in the form of ATP. At the molecular level, this is a cyclic, multistep process that involves binding and hydrolysis of ATP, and movement of actin by myosin.
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The menstrual cycle includes a critical component known as the ovarian cycle, which undergoes two main phases each month—the follicular phase and the luteal phase. The follicular phase is variable and averaging around 14 days. Ovulation, triggered by a surge in luteinizing hormone (LH), marks the transition between the two phases. The second phase, the luteal phase, is relatively consistent, lasting approximately 14 days, and is marked by the activity of the corpus luteum. While a cycle...
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Physiology of the Heart: The Cardiac Cycle01:18

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The cardiac cycle describes the events from one heartbeat to the next. It includes three main phases: diastole, atrial systole, and ventricular systole, all driven by changes in chamber pressures and the function of heart valves.
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In terms of human respiration, the act of expelling air, known as exhalation (or expiration), operates on the principle of pressure gradients. During expiration, the pressure within the lungs exceeds that of the surrounding atmosphere. Under normal conditions, quiet breathing involves passive exhalation and is free of muscular contractions. This is because the exhalation process is driven by the natural elastic recoil of the lungs and chest wall, both of which have an inherent tendency to...
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Rodent Estrous Cycle Monitoring Utilizing Vaginal Lavage: No Such Thing As a Normal Cycle
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Coming Full Cycle.

Lindsey Fay1, Allison Carll-White1, James Harrell2,3

  • 11 University of Kentucky, Lexington, KY, USA.

HERD
|October 14, 2016
PubMed
Summary

A full cycle postoccupancy evaluation (POE) in an emergency department (ED) successfully integrated research findings into design through a collaborative charrette, improving evidence-based decision-making.

Keywords:
charrettedesign processemergency departmentevidence-based designpostoccupancy evaluation

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Area of Science:

  • Healthcare Design Research
  • Evidence-Based Design
  • Postoccupancy Evaluation Methodologies

Background:

  • Postoccupancy evaluations (POEs) often fail to translate findings into actionable design improvements.
  • Design charrettes offer a structured approach to integrate POE evidence into practice.

Purpose of the Study:

  • To demonstrate a full-cycle diagnostic postoccupancy evaluation (POE) in an emergency department (ED).
  • To illustrate methods for planning POEs, collecting meaningful data, and applying outcomes via a design charrette.

Main Methods:

  • A multiphased, multimethodological study for POE planning.
  • Utilized objective and subjective measures for qualitative and quantitative data collection.
  • Employed a design charrette for interactive application of research findings in ED redesign.

Main Results:

  • Identified key issues impacting ED experience: workflow, communication, privacy, and safety/security.
  • The charrette effectively linked POE findings to design application.
  • Successful charrette design requires inclusivity, clear evidence, engagement, and feasible outcomes.

Conclusions:

  • Completing the POE process is crucial for bridging the research-design application gap.
  • The charrette process facilitates evidence-based decision-making in healthcare design.
  • Enhances participant sensitivity to the importance of research in design.