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The role of malnutrition in prolonged respiratory failure : the effect of accelerated nutritional rehabilitation

To investigate the possibility that malnutrition is an important factor that prolongs respiratory failure (PRF), I studied the effects of pharmacologic injections of recombinant human growth hormone (rhGH), an important anabolic stimulus, on nutritional and respiratory parameters in patients requiring mechanical ventilation for more than three days. Patients were excluded from consideration if dominating factors known to prolong ventilatory failure had not been stabilized. Over ten months, 106 patients in PRF were evaluated, but only six met the selection criteria. Three patients were randomized to receive standard nutritional support, and three into a group that received the equivalent nutrition plus 5 mg/day of rhGH for 14 days or until withdrawal of mechanical ventilation. Baseline characteristics of the selected patients were divergent as demonstrated by body mass indexes ranging from 14 to 42 (kg/m$ sp2),$ baseline maximal inspiratory pressures (PI$ sb{ max}$ from $-$15 to $-$70 cm H$ sb2$O, and Day 1 N balances from $-$13.5 to 1.2 g N/day. Despite increased plasma insulin-like growth factor-1 concentrations, the mean daily N balances of the rhGH-treated group were no better than the controls (1.3 $ pm$ 5.0 vs. 0.4 $ pm$ 2.6 g N/day; Mean $ pm$ SD), nor were there differences in PI$ sb{ max},$ level of ventilatory assistance required, and days to weaning. The persistence of respiratory failure in the overwhelming majority of patients in PRF appears to be due to factors already known to prevent weaning from mechanical ventilation. Even the carefully selected patients enrolled in the present study were insufficiently homogeneous or stable enough to allow proper testing of the experimental hypothesis.

Identiferoai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.22740
Date January 1995
CreatorsHinze, Candace
ContributorsHoffer, John (advisor)
PublisherMcGill University
Source SetsLibrary and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada
LanguageEnglish
Detected LanguageEnglish
TypeElectronic Thesis or Dissertation
Formatapplication/pdf
CoverageMaster of Science (School of Dietetics and Human Nutrition.)
RightsAll items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated.
Relationalephsysno: 001467876, proquestno: MM05563, Theses scanned by UMI/ProQuest.

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