Valsalva Maneuver
Valsalva Maneuver - Related Videos
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Software for Analysis of Heart Rate and Blood Pressure Time-series Data from the Valsalva Maneuver
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Cited by 1 •
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The ValsalvaAnalyzer software includes functions to analyze continuous beat-to-beat electrocardiogram and blood pressure (BP) measurements recorded during the Valsalva maneuver (VM). The computed clinical biomarkers and estimated model outputs provide insight into sympathetic and parasympathetic regulation of heart rate and BP during the VM.
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Quantitative Autonomic Testing
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Standardized, comprehensive and fully quantitative testing of autonomic functions is described. The autonomic tests consist of evaluation of all three major autonomic domains including cardiovagal, adrenergic and sudomotor. The severity and distribution of dysautonomia is quantitated using Composite Autonomic Severity Scores.
12:27
Modified Laparoscopic Anatomic Hepatectomy: Two-Surgeon Technique Combined with the Simple Extracorporeal Pringle Maneuver
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Here, we present a protocol to perform a modified laparoscopic anatomic hepatectomy using improved techniques and instruments.
08:35
Oxygenation-sensitive Cardiac MRI with Vasoactive Breathing Maneuvers for the Non-invasive Assessment of Coronary Microvascular Dysfunction
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Cited by 16 •
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The assessment of microvascular function by oxygenation-sensitive cardiac magnetic resonance imaging in combination with vasoactive breathing maneuvers is unique in its ability to assess rapid dynamic changes in myocardial oxygenation in vivo and, thus, may serve as a critically important diagnostic technique for coronary vascular function.
08:42
Using Point of Care Ultrasound to Augment Acquisition of Physical Exam Skills: Veins and Arteries
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2023
Source: Joseph H. Donroe, Rachel Liu; Yale School of Medicine, USA Vascular diseases make up most cases of emergency hospitalization and carry a high mortality risk. Point-of-care ultrasound or POCUS enables accurate diagnosis of these diseases and shortens the time between detection of the cause and selection of appropriate treatment strategies, thus, reducing the patient mortality rate. POCUS offers a safe, low-cost, and less invasive bedside tool for examining arteries and veins, besides its...
FAQs
The maneuver produces a sequence of pressure-related cardiovascular changes rather than a single response. During forced expiration, increased intrathoracic pressure reduces venous return and alters blood pressure and heart rate. When the pressure is released, cardiovascular conditions shift again, allowing the response to be evaluated across distinct phases instead of at one isolated measurement.
The baroreflex provides the autonomic adjustment that follows pressure-related changes in circulation. As blood pressure and cardiac filling change, reflex autonomic activity modifies heart-rate and cardiovascular responses. Observing this adjustment helps distinguish the initial mechanical effect of the maneuver from the subsequent regulatory response, which is particularly relevant when assessing autonomic function.
Venous return is a central variable because increased thoracic pressure temporarily reduces the amount of blood returning to the heart. This change influences cardiovascular function and contributes to transient alterations in blood pressure and heart rate. Comparing responses during pressure generation and after release helps reveal how cardiac filling and circulatory regulation interact.
Drug treatment may change the blood-pressure or heart-rate responses generated during the maneuver, or modify the baroreflex adjustment that follows them. Pharmacological assessment therefore compares the cardiovascular response under different conditions to examine effects on autonomic and cardiovascular control. The maneuver provides a structured physiological challenge for interpreting such drug-induced changes.
A cardiovascular assessment requires a controlled forced expiration against a closed glottis, followed by release of the generated pressure. The pressure-producing phase creates the initial change in intrathoracic pressure, venous return, blood pressure, and heart rate. The release phase then allows evaluation of the baroreflex response and the subsequent cardiovascular adjustment.
Researchers use the maneuver when they need to examine autonomic or cardiovascular responses under a controlled physiological challenge. It can help evaluate how drugs affect blood-pressure regulation, heart-rate regulation, or baroreflex-related adjustments. Because the maneuver produces predictable hemodynamic phases, investigators can compare drug-related changes with the expected sequence of responses.
The maneuver can sometimes support vagal termination of certain supraventricular tachycardias. Its relevance comes from the autonomic response associated with the maneuver, which may interrupt the abnormal rhythm in appropriate cases. It is not presented as a universal treatment, but as a potential supportive intervention whose usefulness depends on the specific tachycardia.