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Biomedical subjects

H Igawa

Publications and source records attributed to H Igawa.

22 records · Page 2Linked to original sources
PubMed1993

Laserflowgraphy: a new visual blood flow meter utilizing a dynamic laser speckle effect.

We developed a visual laser blood flow meter that is capable of providing two-dimensional color graphic representations of blood flow distribution for a given area by utilizing a dynamic laser speckle effect. The device is called the laserflowgraph. The principle and configuration of this flowmeter, comparison with the 133Xe clearance method, difference from thermography, and clinical uses of this flowmeter in flap monitoring are presented. Flow level of the laserflowgraph was significantly correlated with blood flow rate determined by 133Xe clearance in observations on the forearms of normal volunteers. The laserflowgraph reflected blood flow through the region between the skin surface and the deeper region of the papillary layer of the dermis. The laserflowgraph is a highly useful, practical, and reliable tool for assessing cutaneous blood flow and is expected to be applicable to various clinical fields.

Adult↗
PubMed1992

Reconstruction of recurrent pressure sores using free flaps.

The authors describe two successful reconstructions of recurrent pressure sores with free fasciocutaneous flaps. In Case 1, a free lateral thigh flap pedicled on the first and third direct cutaneous branches of the deep femoral vessels was used to cover a large recurrent sacral pressure sore. The vascular pedicle was dissected to the deep femoral trunk proximally and anastomosed to the inferior gluteal vessels. In Case 2, a free medial plantar flap was transferred to a recurrent ischial pressure sore. The vascular pedicle was dissected to the posterior tibial vessels proximally. The long vascular pedicle of the flap was passed through the femoral subcutaneous tunnel, and end-to-side microvascular anastomoses were performed to the superficial femoral trunk without any vein grafts. The authors advocate the use of free tissue transfer for recurrent pressure sore reconstruction.

Humans↗
PubMedDate not supplied

Intraoperative identification of regenerated chorda tympani nerve and its relationship to recovered taste function.

This study demonstrated a simple method of repairing the severed chorda tympani nerve and a method of intraoperative identification of regenerated nerves, and evaluated taste function of regenerated nerves. Seven patients who underwent staged tympanoplasty and whose chorda tympani nerve was severed during primary surgery were evaluated. When the chorda tympani nerve was severed during primary surgery, proximal and distal stumps were anastomosed or approximated almost in the original position and fixed with fibrin glue on the temporal muscle fascia used to reconstruct the eardrum by the underlay method. During primary surgery, end-to-end anastomosis was possible in 3 patients but nerve gap defects remained in the other 4 patients. In all 7 patients, regenerated nerves were identified during secondary surgery not in the tympanic cavity but in the submucosal layer of the previously reconstructed eardrum. In all patients, complete or incomplete recovery of taste perception was observed by both the filter paper disk method and electrogustometry, suggesting that the regenerated nerves had actual taste function. From these results, it was concluded that the severed chorda tympani nerve could regenerate in the reconstructed eardrum even if nerve gap defects remained between the proximal and distal cut ends, when repair or approximation of the nerve was properly completed.

Adolescent↗