NAPH definition
Examples of NAPH in a sentence
It has been demonstrated that between 7% and 17% of posterior circulation aneurysmal ruptures can present with the NAPH pattern on CT.5,6 In ad- Received June 22, 2009; accepted after revision October 26.
Of the 8 cases in which there was disagreement, in 3 cases 1 observer on 1 read recorded the NAPH pattern as present; and in 4 cases, 2 observers on 1 read reported a NAPH pattern.
Studies have shown that >90% of patients who present with the NAPH pattern have limited morbidity, and mortality is extremely rare.2-4 These observed outcomes are in contrast to those of untreated aneu- rysmal SAH, in which morbidity and mortality rates are >50%.
We also found that in approximately 22% of cases, there was disagreement as to whether the SAH matched the NAPH pattern.
Thus, careful judgment should be exercised before making triage decisions when patients present with CT images that are suggestive of a NAPH bleed.
The determination of the NAPH pattern is important be- cause this pattern is associated with better clinical outcome than that seen with aneurysmal SAH.
Four observers retrospectively analyzed a series of 37 CT scans in patients who presented with SAH in an effort to determine whether AJNR Am J Neuroradiol 31:1103– 05 | Jun-Jul 2010 | ▇▇▇.▇▇▇▇.▇▇▇ 1103 Measure Result Average intraobserver n 0.80 Range intraobserver n 0.69–0.87 Average interobserver n 0.79 Range interobserver n 0.73–0.88 % cases with unanimous agreement 78.4 each CT scan represented the classic pattern of NAPH.
To better define the variation among independent readers regarding whether a given CT scan satisfies the criteria for the NAPH, we performed a formal inter- and intraobserver vari- ability study on a consecutive case series.
In 1 case, 2 observers reported on both reads that the NAPH pattern was present and 2 readers reported on both reads that the NAPH pattern was not present.
Before the first set of readings, each participant was given the NAPH criteria described above.