As for the previous medical history, the majority (55%) of the patients had cardiovascular diseases, while only 1.5% had infectious empyema.

Table 1: As for the previous medical history, the majority (55%) of the patients had cardiovascular diseases, while only 1.5% had infectious empyema.

Factors	Frequency	Percent
Cardiovascular	72	55
Other PMH	48	36.6
None	28	21.4
CKD	17	13.0
Metastasis	13	9.9
Primary malignancy	8	6.1
Neurological disease	5	3.8
Infectious empyema	2	1.5
Infectious parapneumonic	1	0.8
Inflammatory autoimmune	0	0.0
Liver failure	0	0.0