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(mī′tō-sōm) [Gr. mitos, thread, + soma, body] A stainable portion of the spindle fibers following mitosis.

mitotic index

(mī-totik) SEE: under index.

Mitragyna speciosa

SEE: mitragynine.


An alkaloid found in kratom (Mitragyna speciosa), a deciduous and evergreen tree native to Southeast Asia. It is a euphoriant and a sedative; it is used illicitly as an analgesic and as a treatment for opiate withdrawal.


(mī′trăl) [miter, the official headdress of a bishop of the Western Christian Church + -al(1)] Pert. to the mitral valve. SEE: mitral valve.

mitral area

(mī′trăl) The area of the chest wall over the apex of the heart where mitral valve sounds are heard best. This area is usually between intercostal spaces 5–6 to the left of the midclavicular line.

mitral commissurotomy

A surgical procedure for treating stenosis of the mitral valve of the heart, in which the stenosed valve leaflets are separated from each other. Patients may undergo an open or a closed procedure.

PATIENT CARE: Prior to mitral valve surgery, cardiac catheterization is performed to evaluate coronary artery anatomy, the severity of the mitral stenosis, and the presence of other cardiac pathologies. Specially trained cardiac surgery nurses provide general care for the patient undergoing open heart surgery including support of oxygenation, ventilation, fluid status, blood pressure, and pain relief. The types of access lines and endotrachial and drainage tubes in place after surgery, as well as the reasons for their use, are explained. The type of postoperative pain to be expected is also explained, and the patient is encouraged to report pain before it becomes severe to maintain a comfortable state necessary for healing. General patient care concerns apply throughout the patient's hospitalization. The caregivers support the patient and family throughout recovery. Anticoagulant therapy may be prescribed for patients with artificial valves postoperatively. Antibiotic prophylaxis is required prior to dental procedures to prevent endocarditis. After discharge, the patient begins a gradual return to activity. Regular medical follow-up to assess valve function, and to detect heart failure, heart blocks, or dysrhythmias such as atrial fibrillation are a necessary part of care. Participation in a cardiac rehabilitation program, if recommended by the physician, should be encouraged.

mitral stenosis

SEE: under stenosis.

mitral valve

SEE: under valve.

mitral valve prolapse

SEE: under prolapse.

Mitrofanoff procedure

(mi-trof′ă-nof″) [Paul Mitrofanoff, Fr. urologist and pediatric surgeon] The creation of a urinary conduit from the ...

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