Pulmonary Ejection Time
Pulmonary Ejection Time - Related Videos
08:17
Murine Echocardiography of Left Atrium, Aorta, and Pulmonary Artery
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Cited by 8 •
2017
The following protocol describes the methodology for the acquisition and analysis of echocardiographic images used to obtain the Left Atrial Volume (LAV), Aorta (Ao) diameter, and Pulmonary Artery (PA) diameter in mice. This technique is a non-invasive, non-terminal procedure that allows assessment of the cardiopulmonary function.
05:07
Pulmonary Structural MRI using Free-Breathing, Self-Gated Ultra-short Echo Time Imaging
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2024
A protocol is described for generating high-resolution structural images of the lungs using ultra-short-echo time (UTE) Magnetic Resonance Imaging (MRI). This protocol allows for images to be acquired using a simple MRI pulse sequence during free-breathing.
06:59
Catheter-based Endovascular Angioplasty for Fibrosing Mediastinitis-associated Pulmonary Vein Stenosis
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2025
Pulmonary vein stenosis (PVS) is a life-threatening complication of fibrosing mediastinitis (FM), with a poor prognosis if not properly treated. Currently, catheter-based endovascular angioplasty is a promising therapeutic strategy for FM-associated PVS. This protocol primarily outlines a stepwise approach to the transcatheter procedure for FM-associated PVS.
13:32
Videomorphometric Analysis of Hypoxic Pulmonary Vasoconstriction of Intra-pulmonary Arteries Using Murine Precision Cut Lung Slices
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Cited by 29 •
2014
Hypoxic pulmonary vasoconstriction (HPV) is an important physiological phenomenon by which at alveolar hypoxia lung perfusion is matched to ventilation. The major vascular segment contributing to HPV is the intra-acinar artery. Here, we describe our protocol for the analysis of HPV of murine pulmonary vessels with diameters of 20-100 μm.
12:29
Magnetic Resonance Imaging Quantification of Pulmonary Perfusion using Calibrated Arterial Spin Labeling
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Cited by 18 •
2011
A MR imaging method to study the distribution of pulmonary blood flow under a variety of physiological conditions, in this case exposure to three different inspired oxygen concentrations: hypoxia, normoxia, and hyperoxia, is described. This technique utilizes human pulmonary physiology research techniques in an MR scanning environment.
FAQs
Heart rate provides essential timing context for this interval. The same measured duration may have different significance when the cardiac cycle is faster or slower, so interpretation should not rely on the time value alone. Combining it with heart rate helps clinicians and researchers relate right-sided ejection timing to the broader cardiac rhythm.
The interval links right-ventricular contraction with blood movement into the pulmonary circulation. It begins when forward flow appears through the pulmonary valve and ends when that flow stops, so the measurement reflects the timing of ventricular ejection and pulmonary arterial flow together. This makes it relevant to assessment of right-sided cardiac performance.
Pulmonary ejection time does not provide a complete description of cardiovascular function by itself. Hemodynamic findings supply additional information about pressures and flow conditions that may influence interpretation. Considering those findings with the interval can strengthen assessment of right-ventricular performance and help place possible pulmonary vascular effects, including pulmonary hypertension, in context.
Doppler echocardiography measures the interval on the recorded pulmonary blood-flow signal. The observer identifies the onset of forward flow and then identifies when that flow ceases, using those two points as the measurement boundaries. Because the method is noninvasive, it can provide timing information about right-sided ejection without requiring an invasive measurement procedure.
Two landmarks determine the result: the beginning of forward pulmonary blood flow and its cessation. The first indicates when flow through the pulmonary valve is detected, while the second marks the end of that ejection flow. Consistently identifying both boundaries is important because the interval represents the time between these Doppler events.
It is useful when investigators or clinicians need a noninvasive indicator related to right-sided cardiac function and pulmonary vascular conditions. In particular, it can support evaluation involving pulmonary hypertension, especially when interpreted with heart rate and other hemodynamic findings. Cardiovascular research can also use the measurement for noninvasive physiological assessment.