An experimental study was done to evaluate the pattern of healing after sealing an incision in the pulmonary parenchyma with the Nd-YAG laser. Gross and histologic examinations of healing were compared with those of lung cauterized or sutured with chronic catgut. The results indicate that the use of the Nd-YAG laser to seal small vessels and air leaks has distinct advantages over cautery or suture closure of incisions in pulmonary tissue.

Correspondence 567 due to 'damping'. Urine output was satisfactory and as heart action slowly improved with treatment the gradient disappeared; the radial artery pressure was 80 mmHg at the end of the operation.The question is which pressure is physiologically the more significant in such cases? More precisely, which more accurately reflects the perfusion pressure for vital organs and is the better guide to therapy? Maybe the questions are academic since organ blood flow also varies and critically depends on vascular resistance which cannot be measured clinically. We know the brain and heart, for example are, protected at the expense of the skin and viscera in shock. If the kidneys also function satisfactorily, as in this case, despite a very low peripheral pressure, perhaps it indicates that the central pressure is higher and adequate.

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