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Related Experiment Videos

Valsalva using a syringe: pressure and variation.

Hilary Sarah Thornton1, Mohammed H Elwan2, Joseph A Reynolds1

  • 1Emergency Medicine Academic Group, Department of Cardiovascular Sciences, University of Leicester, Leicester, UK.

Emergency Medicine Journal : EMJ
|July 25, 2016
PubMed
Summary
This summary is machine-generated.

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The Valsalva manoeuvre, used to treat supraventricular tachycardia, showed inconsistent syringe pressures. A 20mL syringe was best for achieving 40mmHg, but some syringes stuck, making consistent pressure difficult.

Area of Science:

  • Emergency Medicine
  • Cardiology
  • Medical Devices

Background:

  • The Valsalva manoeuvre is a common technique in emergency departments (EDs).
  • It is used to terminate supraventricular tachycardia (SVT) by having patients blow into a syringe.
  • The effectiveness relies on generating adequate intrathoracic pressure.

Purpose of the Study:

  • To determine if a specific syringe size is optimal for the Valsalva manoeuvre in the ED.
  • To assess the relationship between syringe size and achievable pressure.
  • To improve the consistency and efficacy of this intervention.

Main Methods:

  • Testing various syringe sizes to measure the pressure generated during simulated Valsalva manoeuvres.
  • Evaluating the force required to move syringe plungers.
Keywords:
arrythmiaemergency departmenttreatment

Related Experiment Videos

  • Measuring the pressure achieved with different syringe sizes and plunger positions.

    • Main Results:

    • Twenty percent of tested syringes experienced plunger 'sticking,' requiring excessive force.
    • A 20mL syringe was most effective in achieving the target pressure of 40mmHg in 80% of cases.
    • Once unstuck, the plunger's initial position did not impact the pressure generated.

    Conclusions:

    • Recommending a specific syringe size for consistent pressure during the Valsalva manoeuvre is not feasible.
    • Syringe variability, including plunger friction, affects the ability to achieve target pressures.
    • Further research may be needed to standardize devices for this procedure.