The Valsalva test is a method of holding the breath after deep inhalation and then performing a forceful exhalation maneuver, which can be used to identify the source of the heart murmur. 1. The Valsalva test is a test in which the patient performs a deep inhalation followed by a breath-hold and then a forceful exhalation to increase the pressure in the chest cavity and stimulate the vagus nerve for diagnostic and therapeutic purposes. 2. The main clinical significance is that when there is obstruction in hypertrophic heart disease or mitral valve prolapse leading to mitral regurgitation, the Valsalva maneuver can enhance the murmur to assist in the diagnosis. 3. In addition, some patients with paroxysmal supraventricular tachycardia can perform the valsalva maneuver to stop the tachycardia. Specific operations should be carried out under the guidance of a physician. If there is any discomfort, it is recommended to consult a doctor in time for diagnosis and treatment.