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TEST 3 - CRT
PFT, NEO/PEDI, CPR, MEDS, ABG
Question | Answer |
---|---|
EXHALED VT IS MEASURED WITH | RESPIROMETER @ BEDSIDE OR BY SPIROMETRY |
WHEN IS VT DECREASED | RESTRICTIVE DISEASE |
WHEN IS VT INCREASED | OBSTRUCTIVE DISEASE |
NORMAL VT IS | 500 ML OR 3 ML/LB OF BODY WEIGHT |
DEFINE IRV | INSPIRATORY RESERVE VOLUME-THE MAXIMUM VOLUME OF AIR THAT CAN BE INSPIRED AFTER A NORMAL INSPIRATION |
NORMAL VALUE FOR IRV | 3000 ML |
DEFINE ERV | EXPIRATORY RESERVE VOLUME-VOLUME OF AIR EXHALED AFTER A NORMAL EXPIRATION |
ERV IN OBSTRUCTIVE N RESTRICTIVE DISEASE | WOULD BE NORMAL OR DECREASED IN BOTH |
NORMAL VALUE FOR ERV | 1000 ML AND 20%-25% OF THE VC |
DEFINE RV | RESIDUAL VOLUME-VOLUME OF AIR LEFT IN LUNGS AFTER A MAXIMAL EXPIRATION |
HOW DO YOU MEASURE RV | NITROGEN WASHOUT OR HELIUM DILUTION |
CALCULATION FOR RV | RV=FRC-ERV |
RV IN OBSTRUCTIVE N RESTRICTIVE DISEASE | INCREASED IN OBSTRUCTIVE N DECREASED IN RESTRICTIVE |
DEFINE FRC | FUNCTIONAL RESIDUAL CAPACITY-AMOUNT OF AIR LEFT IN LUNGS AFTER A NORMAL EXPIRATION |
CALCULATION FOR FRC | ERV+RV=FRC |
HOW IS FRC MEASURED | HELIUM DILUTION, NITROGEN WASHOUT, OR BODY PLETHYSMOGRAPHY |
STEPS TO MEASURE FRC BY HELIUM | FILL SPIROMETER WITH 600ML OF GAS N 10% HELIUM. PATIENT TAKES NORMAL BREATH, AT END OF EXHALE CONNECT TO SYSTEM. PT REBREATHES THE GAS, CO IS REMOVED, HELIUM DILUTED |