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Valsalva maneuver

 

Valsalva maneuver

A man performs the Valsalva maneuver while his ear is examined with an otoscope.

The Valsalva maneuver or Valsalva manoeuvre is performed by moderately forceful attempted exhalation against a closed airway, usually done by closing one's mouth, pinching one's nose shut while pressing out as if blowing up a balloon. Variations of the maneuver can be used either in medical examination as a test of cardiac function and autonomic nervous control of the heart, or to "clear" the ears and sinuses (that is, to equalize pressure between them) when ambient pressure changes, as in diving, hyperbaric oxygen therapy, or air travel.

The technique is named after Antonio Maria Valsalva,[1] a 17th-century physician and anatomist from Bologna whose principal scientific interest was the human ear. He described the Eustachian tube and the maneuver to test its patency (openness). He also described the use of this maneuver to expel pus from the middle ear.

A modified version is done by expiring against a closed glottis. This will elicit the cardiovascular responses described below but will not force air into the Eustachian tubes.

The maneuver increases intraocular pressure and increases the risk of retinal detachment.

Contents

  • Physiological response 1
  • Normalizing middle-ear pressures 2
  • Weightlifting 3
  • Diving 4
  • Heart 5
  • Neurology 6
  • Oral-Antral Communication 7
  • Urogenital 8
  • Valsalva retinopathy 9
  • Valsalva device in spacesuits 10
  • See also 11
  • References 12
  • External links 13

Physiological response

Blood pressure (systolic) and pulse rate during a normal response to Valsalva’s maneuver. Forty millimeter mercury pressure is applied at 5 seconds and relieved at 20 seconds.

The normal physiological response consists of four phases.[2]

  1. Initial pressure rise
    On application of expiratory force, pressure rises inside the chest forcing blood out of the pulmonary circulation into the left atrium. This causes a mild rise in stroke volume.
  2. Reduced venous return and compensation
    Return of systemic blood to the heart is impeded by the pressure inside the chest. The output of the heart is reduced and stroke volume falls. This occurs from 5 to about 14 seconds in the illustration. The fall in stroke volume reflexively causes blood vessels to constrict with some rise in pressure (15 to 20 seconds). This compensation can be quite marked with pressure returning to near or even above normal, but the cardiac output and blood flow to the body remains low. During this time the pulse rate increases (compensatory tachycardia).
  3. Pressure release
    The pressure on the chest is released, allowing the pulmonary vessels and the aorta to re-expand causing a further initial slight fall in stroke volume (20 to 23 seconds) due to decreased left atrial return and increased aortic volume, respectively. Venous blood can once more enter the chest and the heart, cardiac output begins to increase.
  4. Return of cardiac output
    Blood return to the heart is enhanced by the effect of entry of blood which had been dammed back, causing a rapid increase in cardiac output (24 seconds on). The stroke volume usually rises above normal before returning to a normal level. With return of blood pressure, the pulse rate returns towards normal.

Deviation from this response pattern signifies either abnormal heart function or abnormal autonomic nervous control of the heart. Valsalva is also used by dentists following extraction of a maxillary molar tooth. The maneuver is performed to determine if a perforation or antral communication exists.

Normalizing middle-ear pressures

When rapid ambient pressure increase occurs as in diving or aircraft descent, this pressure tends to hold the Eustachian tubes closed, preventing pressure equalization across the ear drum, with painful results.[3][4][5] To avoid this painful situation, divers, caisson workers and aircrew attempt to open the Eustachian tubes by swallowing, which tends to open the tubes, allowing the ear to equalize itself.

If this fails, then the Valsalva maneuver may be used. It should be noted this maneuver, when used as a tool to equalize middle ear pressure, carries with it the risk of auditory damage from over pressurization of the middle ear.[4][6][7][8] It is safer, if time permits, to attempt to open the Eustachian tubes by swallowing a few times, or yawning. The effectiveness of the "yawning" method can be improved with practice; some people are able to achieve release or opening by moving their jaw forward or forward and down, rather than straight down as in a classical yawn,[4] and some can do so without moving their jaw at all. Opening can often be clearly heard by the practitioner, thus providing feedback that the maneuver was successful.

During swallowing or yawning, several muscles in the pharynx (throat) act to elevate the soft palate and open the throat. One of these muscles, the tensor veli palatini, also acts to open the eustachian tube. This is why swallowing or yawning is successful in equalizing middle ear pressure. Contrary to popular belief, the jaw does not pinch the tubes shut when it is closed. In fact, the eustachian tubes are not located close enough to the mandible to be pinched off. People often recommend chewing gum during ascent/descent in aircraft, because chewing gum increases the rate of salivation, and swallowing the excess saliva opens the eustachian tubes.

In a clinical setting the Valsalva maneuver will commonly be done either against a closed glottis, or against an external pressure measuring device, thus eliminating or minimizing the pressure on the Eustachian tubes. Straining or blowing against resistance as in blowing up balloons has a Valsalva effect and the fall in blood pressure can result in dizziness and even fainting.

Weightlifting

The Valsalva maneuver is commonly believed to be the optimal breathing pattern for producing maximal force and is frequently used in powerlifting to stabilize the trunk during exercises such as the Squat, Deadlift, and Bench Press, and in both lifts of Olympic weightlifting.[9] However, this view was not supported by a recent study, in which Hagins et al. found that, although intra-abdominal pressure increased significantly with the Valsalva maneuver over other breathing conditions during a simulated maximum lifting task, this breathing pattern was not associated with increased trunk extension force production.[10] The VM, unfortunately, imposes negative hemodynamic effects on the cardiovascular system, e.g., increased blood pressure, increased heart rate, and risk of cerebral hemorrhage.[11][12][13] Therefore, the VM is not recommended for strength training purposes,[14] particularly in people with high systemic blood pressure.[15]

It is highly recommended that forced exhalation, rather than the Valsalva maneuver, should be used during maximal force production, whenever possible.[16]

Diving

In diving, the Valsalva maneuver is often used on descent to equalise the pressure in the middle ear to the ambient pressure. If the Valsalva maneuver is conducted during ascent, residual air overpressure in the middle-ear can potentially be released through the Eustachian tubes.

Heart

The Valsalva maneuver may be used to arrest episodes of supraventricular tachycardia.[17][18] The maneuver can sometimes be used to diagnose heart abnormalities, especially when used in conjunction with echocardiogram.[19] For example, the Valsalva maneuver increases the intensity of hypertrophic cardiomyopathy murmurs, namely those of dynamic subvalvular left ventricular outflow obstruction. At the same time, the Valsalva maneuver decreases the intensity of most other murmurs, including aortic stenosis and atrial septal defect.

Effect of Valsalva Cardiac Finding
Decreases Murmur
Aortic stenosis
Pulmonic stenosis
Tricuspid regurgitation
Increases Murmur
Hypertrophic cardiomyopathy, mitral valve prolapse

The Valsalva maneuver works by decreasing preload to the heart. A complementary maneuver for differentiating disorders is the handgrip maneuver, which increases afterload.

The Valsalva maneuver (in the straining phase) reduces the filling of the right and then the left side of the heart. Stroke volume and blood pressure falls, while the heart rate increases.

Neurology

The Valsalva maneuver is used to aid in the clinical diagnosis of problems or injury in the nerves of the cervical spine.[20] Upon performing the Valsalva maneuver, intraspinal pressure slightly increases. Thus, neuropathies or radicular pain may be felt or exacerbated, and this may indicate impingement on a nerve by an intervertebral disc or other part of the anatomy. Headache and pain upon performing the Valsalva maneuver is also one of the main symptoms in Arnold–Chiari malformation. The Valsalva maneuver may be of use in checking for a dural tear following certain spinal operations such as a microdiscectomy. An increase in intra-spinal pressure will cause CSF to leak out of the dura causing a headache.

Oral-Antral Communication

A variant of the Valsalva maneuver is used to aid diagnosis of Oral-Antral Communication, i.e. the existence of a connection between the oral cavity and the maxillary sinus.[21].

Urogenital

The Valsalva maneuver is used to aid diagnosis of

  • Definitions of various clinical tests for neuropathy
  • More on the topic of Vitreous hemorrhage
  • More on the topic of Valsalva retinopathy

External links

  1. ^ synd/2316 at Who Named It?
  2. ^ Luster, EA; Baumgartner, N; Adams, WC; Convertino, VA (1996). "Effects of hypovolemia and posture on responses to the Valsalva maneuver".  
  3. ^ Brubakk, A. O.; Neuman, T. S. (2003). Bennett and Elliott's physiology and medicine of diving, 5th Rev ed. United States: Saunders Ltd.  
  4. ^ a b c Kay, E. "Prevention of middle ear barotrauma". Retrieved 2008-06-11. 
  5. ^ Kay, E. "The Diver's Ear - Under Pressure" (Flash video). Retrieved 2008-06-11. 
  6. ^ Roydhouse, N (1978). "The squeeze, the ear and prevention".  
  7. ^ Taylor, D (1996). "The Valsalva Manoeuvre: A critical review".  
  8. ^ Roydhouse, N and Taylor, D (1996). "The Valsalva Manoeuvre. (letter to editor)".  
  9. ^ FINDLEY BW, KEATING T, TOSCANO L. (2003). "Is the valsalva maneuver a proper breathing technique?". Strength Cond J. 25 (5). 
  10. ^ Hagins, M; Pietrek, M; Sheikhzadeh, A; Nordin, M (October 2006). "The effects of breath control on maximum force and IAP during a maximum isometric lifting task.". Clinical biomechanics (Bristol, Avon) 21 (8): 775–80.  
  11. ^ Henderson, LA; Macey, PM; Macey, KE; Frysinger, RC; Woo, MA; Harper, RK; Alger, JR; Yan-Go, FL; Harper, RM (December 2002). "Brain responses associated with the Valsalva maneuver revealed by functional magnetic resonance imaging.". Journal of neurophysiology 88 (6): 3477–86.  
  12. ^ Pott, F; Van Lieshout, JJ; Ide, K; Madsen, P; Secher, NH (April 2003). "Middle cerebral artery blood velocity during intense static exercise is dominated by a Valsalva maneuver.". Journal of applied physiology (Bethesda, Md. : 1985) 94 (4): 1335–44.  
  13. ^ Zhang, R; Crandall, CG; Levine, BD (April 2004). "Cerebral hemodynamics during the Valsalva maneuver: insights from ganglionic blockade.". Stroke; a journal of cerebral circulation 35 (4): 843–7.  
  14. ^ ZATSIORSKY VM, KRAEMER WJ. (2006). Science and practice of strength training. second edition Human Kinetics. Champaign, IL. 
  15. ^ O'Connor, P; Sforzo, GA; Frye, P (September 1989). "Effect of breathing instruction on blood pressure responses during isometric exercise.". Physical therapy 69 (9): 757–61.  
  16. ^ Ikeda, Elizabeth R; Borg, Adam; Brown, Devn; Malouf, Jessica; Showers, Kathy M; Li, Sheng (January 2009). "The Valsalva Maneuver Revisited: The Influence of Voluntary Breathing on Isometric Muscle Strength". Journal of Strength and Conditioning Research 23 (1): 127–132.  
  17. ^ Lim, SH; Anantharaman, V; Teo, WS; Goh, PP; Tan, ATH (1998). "Comparison of Treatment of Supraventricular Tachycardia by Valsalva Maneuver and Carotid Sinus Massage".  
  18. ^ Nagappan, R; Arora, S; Winter, C (2002). "Potential dangers of the Valsalva maneuver and adenosine in paroxysmal supraventricular tachycardia--beware pre-excitation". Critical care and resuscitation 4 (2): 107–11.  
  19. ^ Zuber, M.; Cuculi, F.; Oechslin, E.; Erne, P.; Jenni, R. (2008). "Is transesophageal echocardiography still necessary to exclude patent foramen ovale?". Scandinavian Cardiovascular Journal 42 (3): 222–5.  
  20. ^ Johnson, RH; Smith, AC; Spalding, JM (1969). "Blood pressure response to standing and to Valsalva's manoeuvre: Independence of the two mechanisms in neurological diseases including cervical cord lesions".  
  21. ^ "How Do I Manage Oroantral Communication? Key Points". Retrieved 13 October 2015. 
  22. ^ O'Shaughnessy, Michael. "Urinary incontinence, medical and surgical aspects". 
  23. ^ Bump, Richard C.; Mattiasson, Anders; Bø, Kari; Brubaker, Linda P.; Delancey, John O.L.; Klarskov, Peter; Shull, Bob L.; Smith, Anthony R.B. (1996). "The standardization of terminology of female pelvic organ prolapse and pelvic floor dysfunction".  
  24. ^ Gibran, S K; Kenawy, N; Wong, D; Hiscott, P (2007). "Changes in the retinal inner limiting membrane associated with Valsalva retinopathy".  
  25. ^ "'"US astronaut grapples with 'tears in space. spacedaily.com. 25 May 2011. Retrieved 27 May 2011. 
  26. ^ It's a Valsalva device, to equalize ears as pressure in suit increases Sam Cristoforetti on Twitter. 22 November 2011. Retrieved 22 November 2012.

References

See also

Some spacesuits contain a device called the Valsalva device to enable the wearer to block their nose to perform the Valsalva maneuver when wearing the suit. Astronaut Drew Feustel describes it as "a spongy device called a Valsalva that is typically used to block the nose in case a pressure readjustment is needed."[25] One use of the device is to equalize pressure during suit pressurization.[26]

Valsalva device in spacesuits

A pathologic syndrome associated with the Valsalva maneuver is Valsalva retinopathy.[24] It presents as preretinal hemorrhage (bleeding in front of the retina) in people with a history of transient increase in the intrathoracic pressure and may be associated with heavy lifting, forceful coughing, straining on the toilet, or vomiting. The bleeding may cause visual loss if it obstructs the visual axis, and patients may note floaters in their visual field. Usually this causes no permanent visual impairments, and sight is fully restored.

Valsalva retinopathy

[23]

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