目的:針對心困性及非心困↑生到院前心跳停止的病人，分析在經急救後恢復自發性循環的臨床特徵及預後相關困子。
方法:在此篇從2007到2009的回溯分析中，我們研究了482個非外傷因素造成之到院前心跳停止的成年病患。在恢復自發性循環後，根據到院前心跳停止的可能病因分成心困性及非心困↑生兩組。除了呈現兩組病人臨床特徵及預後的不同之外，並根據不同的留院時間分析其存活率的變化，及以不同的心肺復甦術時間長短分析是否影響恢復自發性循環的機率和總存活時間。
結果:心困性到院前心跳停止的病人不論是到院前或到院後的心率，都比非心困性病人有較高的可電擊率(P<0，001)。急性冠心症(70，4的及呼吸衰竭(32，5%)分別是造成心困性和非心困↑生到院前心跳停止最常見的病因。 在發生非外傷性到院前心跳停止的病人中，J;)、66歲到80歲這個年齡層的人為玉，而且以心困性居多。非心困性病人的存活率在留院醫療的第一天之後下降得比心困↑生病人還要快。若是有被目擊或是曾被自動體外去顫器電擊的病人可以恢復較長的自發性循環。最後，在院心肺復甦術10分鐘內能恢復自發性循環的病人，在兩組中都能維持最長時間的自發性循環。
結論:心困性到院前心跳停止的病人比起非心困↑生有較高的可電擊率，在66-80歲這個年齡層也以心困性的病人較多。我們發現在留院醫療第一天之後，心困性的病人比非心困性有較好的預後。

Objective: The clinical features and outcomes of patients with sustained return of spontaneous circulation (ROSC) of out-ofhospital cardiac arrest (ORCA) are well known to be poor. The purpose of this study is to analyze the differences of outcomes in patients suffering cardiac or non-cardiac ORCA with sustained ROSC.
Methods: This retrospective study comprised 482 patients， over 18 years of age， who were brought to the emergency department with non-traumatic ORCA (during Jan 2007 to Jan 2009). Patients who achieved sustained ROSC were divided into two groups:cardiac and non-cardiac ORCA， based on their possible etiologies. The differences in the characteristics of the patients，the clinical features and the outcomes were analyzed between the two groups. Time-related survival rates of both groups were calculated according to the duration of the hospital stay and factors associated with the chance of achieving sustained ROSC. The mean total duration of ROSC was also analyzed according to different in-hospital cardiopulmonary resuscitation (CPR) durations.
Results: Pre-hospitaland in-hospital initial cardiac rhythms were both more shockable in cardiac than in non-cardiac ORCA (both P
Conclusion: Patients with cardiac ORCA presented a higher percentage of shockable rhythm than patients with non-cardiac ORCA， and this was mild predominant in patients aged from 66 to 80 years. We found that the outcomes of patients with cardiac ORCA were better than patients with non-cardiac ORCA after the first day of hospital stay.