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Could this be Tombs Of The Blind Dead (1971)? This review mentions the 'hearing heartbeats' angle.

The film revolves around the Knights Templar (a fictionalized version of a real-life order that was dissolved in the 14th century following charges of witchcraft and heresy) coming back from the dead as reanimated corpses bent on revenge. However, the corpses are blind because their eyes were pecked out by birds while their hanged bodies rotted on the gallows.

Despite being blind they have exceptional hearing and are able to hear the human heart beating, thus making it nearly impossible to hide from these hell-bent creatures.

Meanwhile a young couple on vacation takes a train journey, but his girlfriend argues with him, jumps off the train and spends the night in the ruins of an abandoned monastery where the Templars are buried. However, this is the worst time possible as this is the night that the Templars rise from their tombs and kill her.

Warning: This film has NSFW elements and terrible acting throughout.

Could this be Tombs Of The Blind Dead (1971)? This review mentions the 'hearing heartbeats' angle.

The film revolves around the Knights Templar (a fictionalized version of a real-life order that was dissolved in the 14th century following charges of witchcraft and heresy) coming back from the dead as reanimated corpses bent on revenge. However, the corpses are blind because their eyes were pecked out by birds while their hanged bodies rotted on the gallows.

Despite being blind they have exceptional hearing and are able to hear the human heart beating, thus making it nearly impossible to hide from these hell-bent creatures.

Meanwhile a young couple on vacation takes a train journey, but his girlfriend argues with him, jumps off the train and spends the night in the ruins of an abandoned monastery where the Templars are buried. However, this is the worst time possible as this is the night that the Templars rise from their tombs and kill her.

Could this be Tombs Of The Blind Dead (1971)? This review mentions the 'hearing heartbeats' angle.

The film revolves around the Knights Templar (a fictionalized version of a real-life order that was dissolved in the 14th century following charges of witchcraft and heresy) coming back from the dead as reanimated corpses bent on revenge. However, the corpses are blind because their eyes were pecked out by birds while their hanged bodies rotted on the gallows.

Despite being blind they have exceptional hearing and are able to hear the human heart beating, thus making it nearly impossible to hide from these hell-bent creatures.

Meanwhile a young couple on vacation takes a train journey, but his girlfriend argues with him, jumps off the train and spends the night in the ruins of an abandoned monastery where the Templars are buried. However, this is the worst time possible as this is the night that the Templars rise from their tombs and kill her.

Warning: This film has NSFW elements and terrible acting throughout.

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source | link

Could this be Tombs Of The Blind Dead (1971)? This review mentions the 'hearing heartbeats' angle.

The film revolves around the Knights Templar (a fictionalized version of a real-life order that was dissolved in the 14th century following charges of witchcraft and heresy) coming back from the dead as reanimated corpses bent on revenge. However, the corpses are blind because their eyes were pecked out by birds while their hanged bodies rotted on the gallows.

Despite being blind they have exceptional hearing and are able to hear the human heart beating, thus making it nearly impossible to hide from these hell-bent creatures.

Meanwhile a young couple on vacation takes a train journey, but his girlfriend argues with him, jumps off the train and spends the night in the ruins of an abandoned monastery where the Templars are buried. However, this is the worst time possible as this is the night that the Templars rise from their tombs and kill her.