Use of valsalva maneuver clinically

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valsalva maneuver clinical applications

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Valsalva Maneuver - Clinical Uses

The Valsalva maneuver is a forced expiration against a closed glottis (or bearing down as if to defecate), generating an intrathoracic pressure of approximately 30-40 mm Hg for at least 10 seconds. It was first described by Antonio Maria Valsalva (1666-1723) in the context of expelling pus from the middle ear.

Physiology: The Four Phases

The maneuver produces predictable, sequential hemodynamic changes that form the basis for all its clinical uses:

Phase	What Happens	Hemodynamic Effect
I - Onset of straining	Increased intrathoracic pressure transmitted to aorta	Transient rise in systolic BP
II - Sustained strain (active phase)	Compressed veins → decreased venous return → decreased stroke volume → decreased pulse pressure	Reflex tachycardia; BP falls
III - Release of strain	Sudden drop in intrathoracic pressure	Further brief BP fall
IV - Post-strain overshoot	Venous return restored + peripheral vasoconstriction (from phase II) → BP rises above baseline	Reflex bradycardia via baroreceptors

During phase II, the decrease in arterial pressure inhibits baroreceptors, producing tachycardia and increased peripheral resistance. When the glottis opens (phase IV), blood is pumped by a sympathetically activated heart into a constricted circulation, causing BP overshoot and vagally mediated bradycardia.

Ganong's Review of Medical Physiology, 26e

Baroreceptor firing at various mean arterial pressures - phasic aortic pressure tracing

Clinical Uses

1. Termination of SVT (Supraventricular Tachycardia)

This is the most common acute use. Increased intrathoracic pressure reduces venous return, which reflexively increases vagal tone via baroreceptor activation, slowing SA and AV node conduction.

Technique:

Patient supine with IV access and cardiac monitor
Take a deep breath, close lips around thumb, attempt to exhale without releasing air
Alternatively, bear down against the clinician's hand placed on the abdomen
Strain sustained for 10-20 seconds
Roberts and Hedges' Clinical Procedures in Emergency Medicine

Modified Valsalva (superior efficacy):

Position patient at 45 degrees, apply standard Valsalva strain
Immediately reposition supine with passive leg raise at 45 degrees for 15 seconds
The leg raise augments venous return during phase IV, enhancing the vagal response
Has a greater success rate at restoring sinus rhythm than standard Valsalva
The Harriet Lane Handbook, 23rd ed.

In children: The diving reflex (ice-cold water applied to face for 15-30 seconds) is a practical alternative when the child cannot cooperate with the maneuver.

2. Differentiation of Cardiac Murmurs

This is the most important bedside use in cardiology. During phase II, most systolic murmurs decrease (due to reduced LV filling and stroke volume). The key exceptions are:

Condition	Effect on Murmur During Strain Phase	Mechanism
HOCM (hypertrophic obstructive cardiomyopathy)	Increases	Smaller LV cavity → more LVOT obstruction
Mitral valve prolapse	Increases + click moves earlier (toward S1)	Smaller LV → leaflets prolapse earlier into atrium, longer murmur
Aortic stenosis	Decreases	Less flow across fixed stenosis
Mitral regurgitation	Decreases (softer)	Left-sided response to reduced preload
VSD	Decreases	Reduced LV-RV pressure gradient

During Valsalva, the transient reduction in LV size increases the degree of LVOT obstruction in HOCM, increasing murmur intensity. In contrast, the aortic stenosis murmur decreases because of reduced blood flow across the stenotic valve.

Rosen's Emergency Medicine

The examiner should document murmur change only after 6-8 beats during the strain phase, as this is the time needed for the change in blood volume to circulate through the pulmonary vasculature to the left heart.

Fuster and Hurst's The Heart, 15th ed.

Note: If tachycardia is absent during phase II, there is autonomic dysfunction, beta-blockade, or elevated left-sided filling pressures - in these cases, the murmur response is unreliable. - Fuster and Hurst's The Heart, 15th ed.

Bedside maneuver comparison table (HOCM vs MVP):

Intervention	HOCM	Mitral Valve Prolapse
Valsalva strain phase	Murmur increased	Click closer to S1, murmur increased
Standing after squatting	Murmur increased	Click closer to S1, murmur increased
Passive leg elevation	Murmur decreased	Click closer to S2, murmur decreased
Hand grip	Murmur decreased	Click closer to S1, murmur increased
Squatting	Murmur decreased	Click closer to S2, murmur decreased

Tintinalli's Emergency Medicine

3. Assessment of Autonomic Nervous System Function

The Valsalva maneuver is a standard bedside test for autonomic integrity, particularly baroreceptor and sympathetic function.

Protocol: Patient blows into a closed mouthpiece to raise intrathoracic pressure to 40 mm Hg for 12 seconds, while BP and HR are continuously monitored.

Normal response: BP and HR follow the four phases as described above (including reflex tachycardia in phase II and bradycardia + BP overshoot in phase IV).

Abnormal responses:

In sympathetic dysfunction: heart rate changes still occur (baroreceptors and vagus are intact), but the BP rise in phase IV is absent
In complete autonomic insufficiency (e.g., MSA, diabetic autonomic neuropathy): all phases are abnormal - the BP just progressively falls without recovery, and HR changes are absent
In primary hyperaldosteronism: HR changes and BP overshoot in phase IV are absent; returns to normal after tumor removal
Ganong's Physiology; Braunwald's Heart Disease

4. Radiological Use - Hernias and Pelvic Floor Assessment

During fluoroscopy or imaging, a sustained Valsalva maneuver increases intra-abdominal pressure, which helps demonstrate:

Small inguinal or femoral hernias
Pelvic floor defects
Rectocele, enterocele, or other masses

The radiologist should perform examinations with and without a prolonged Valsalva maneuver to demonstrate small defects.

Sleisenger and Fordtran's Gastrointestinal and Liver Disease

5. Ear and Sinus Equalization (ENT)

The Valsalva maneuver is used to open the Eustachian tube by raising nasopharyngeal pressure, equalizing middle ear pressure. This is used:

In divers / aviators to prevent barotrauma
To relieve ear discomfort during ascent/descent
As a test of Eustachian tube patency

The larynx closes tightly during the maneuver, stabilizing the thorax for muscular actions and also allowing increased intra-abdominal pressure for defecation, vomiting, and childbirth. - K.J. Lee's Essential Otolaryngology

6. Cough Headache and Exertional Headache Workup

Primary cough headaches are precipitated by the Valsalva maneuver (coughing, lifting, straining). Recognition is important because:

They must be differentiated from secondary causes (subarachnoid hemorrhage, posterior fossa lesions)
Symptom to Diagnosis: An Evidence-Based Guide, 4th ed.

7. Valsalva Retinopathy

Excessive or forceful Valsalva (heavy lifting, vomiting, prolonged coughing, strenuous bowel movement) causes a sudden rise in intraocular venous pressure, leading to:

Pre-retinal (sub-ILM) hemorrhages at the macula - typically bilateral, bright red with dark center
Usually self-limiting and resolves in weeks to months
Clinically important to distinguish from diabetic retinopathy or other retinal hemorrhages
Wills Eye Manual; Barash's Clinical Anesthesia

Patients with known proliferative retinopathy should be counseled to avoid excessive Valsalva maneuvers during labor.

Rosen's Emergency Medicine

8. Anesthesia - Intubation and Emergence

Vigorous Valsalva maneuvers (bucking on endotracheal tube during emergence, protracted vomiting) can precipitate Valsalva retinopathy in the perioperative setting
Monitored during anesthesia as a test of autonomic integrity
Barash's Clinical Anesthesia, 9e; Miller's Anesthesia, 10e

Performing the Maneuver - Practical Steps

Patient supine (or semirecumbent for modified version)
Cardiac monitor, IV access, resuscitation equipment ready (if for SVT)
Patient takes a deep breath, places thumb in closed mouth, attempts to exhale
Alternatively: "Bear down as if straining during a bowel movement"
Maintain for 10-20 seconds
Observe for SVT termination, murmur change, or hemodynamic response

Contraindications and Precautions

Dyspnea or tachypnea (patient cannot cooperate or sustain the maneuver)
Severe hypertension (initial BP surge may be dangerous)
Known proliferative retinopathy (risk of vitreous/retinal hemorrhage)
Recent myocardial infarction or acute aortic pathology (avoid BP surges)
Recent eye surgery

Summary of Clinical Applications at a Glance

Application	Basis
Terminate SVT	Vagal tone increase → AV node slowing
Differentiate HOCM vs AS murmur	HOCM increases; AS decreases
MVP diagnosis	Earlier click, longer murmur
Autonomic function testing	Absence of HR/BP phases = autonomic dysfunction
Hernia/pelvic floor imaging	Increased intra-abdominal pressure unmasks defects
Eustachian tube equalization	Opens ET by nasopharyngeal pressure
Cough headache evaluation	Trigger for primary cough headache
Valsalva retinopathy	Cause of sub-ILM macular hemorrhages

Anesthetic clinical uses of valsalva maneuver

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