Table 2.

Comparison among cardiovascular monitoring systems.

Ref.	Proposition	Moni-Tored Signs	Electrode Type	Active Material	Electrode Size	Attachment Method	Wireless Connectivity	Accuracy	Signal Acquisistion Module
									Size	Freq.	A/D	Bat. Life, Power
[28]	Sensorized T-shirt and textile belt	ECG, HR	Dry textile electrodes	Silver based conductive yarns		Snap buttons	Bluetooth LE		-	512 Hz	24 bit	-
[29]	Wearable mobile electro-cardiogram monitoring system	ECG, HR, location	Dry foam electrode	Ni/Cu coated compressed urethane polymer foam	14 mm × 8 mm × 8 mm		Bluetooth v2.0, and GSM	99.51% correlation with prerecorded ECG data, QRS detection accuracy ~98.14%	4 cm × 2.5 cm × 0.6 cm	512 Hz	12 bit	33 h, 1100 mAh Li-ion battery
[10]	Wireless, portable capacitive ECG sensor	ECG, HR	Capacitive electrode with cotton insulator		33 mm × 33 mm × 2 mm	Woven under a stretchable belt	ANT		45 mm × 60 mm × 9 mm	500 Hz	10 bit	15 h with 256 mAh 3 V Li battery
[30]	Use of flexible capacitive electrodes for reducing MA	ECG, HR	Flexible capacitive electrodes	Ni/Cu coated foam (polyolefincovered by polyurethane)	300 mm × 20 mm × (1.1 ± 0.2 mm)	Integrated into a chest belt	Bluetooth	Upto 91.32% QRS detection at 7 km/h walking speed	-	256 Hz	-	-
[31]	Common Electrode-FreeECG monitoring System	ECG, HR	Active capacitive electrodes	Copper layer	5 cm × 3 cm	Adhesive tape	-		-	2 kHz	24 bit	-
[32]	HR monitoring from pressure variance in ear canal	HR	Piezo-electric film sensor		3.5 mm × 3.5 mm	Earpiece like device	2.4 GHz RF	Sensitivity 97.25%, PPV 97.18%.	15 mm × 17 mm	100 Hz	12 bit	Coin-cell battery
[33]	Heart Rate Monitoring with pressure sensor	HR	Piezo-resistive pressure sensing	C black/silicone rubber nanocomposite encapsulated in conductive FCCL films	15 mm × 30 mm	Embedded in elastic belt	-	Accuracy > 97%	-	-	-	-